JP2007116508A - Antenna, antenna module using the same, and high frequency signal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact antenna capable of performing reception or exchange with an antenna which is the single antenna and uses two high frequency signals different in frequency band respectively as the ones having a quarter wavelength. <P>SOLUTION: The antenna 15 comprises: an antenna element 23 whose one end is connected to the other end of an antennal element 19; a terminal 15b connected to the other end of the antenna element 23; a frequency block circuit 22 connected between the antenna elements 19, 23; and a frequency block circuit 26 connected between the antenna element 23 and the terminal 15b. The frequency block circuit 22 passes the signal of a first frequency band and blocks the signal of a second frequency band. The frequency block circuit 26 blocks the signal of the first frequency band and passes the signal of the second frequency band. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an antenna that can receive or transmit / receive high-frequency signals in two different frequency bands, and an antenna module and a high-frequency signal device using the same, although it is a single antenna.

  Hereinafter, a conventional high-frequency signal device using an antenna will be described with reference to the drawings. FIG. 6 is a block diagram of a conventional high-frequency signal device.

  In FIG. 6, the high-frequency signal device 1 includes a receiving antenna 2 that receives a television broadcast signal, a receiving unit 3 that is supplied with a reception signal from the receiving antenna 2, and a transmission / reception device that transmits and receives mobile phone signals. An antenna 4, a transmission / reception unit 5 to which an output of the transmission / reception antenna 4 is connected, a signal processing unit 6 to which output signals from the reception unit 3 and the transmission / reception unit 5 are respectively supplied, and a signal processing unit 6 respectively The video display unit 7, the audio output unit 8, and the audio input unit 9 are connected.

  In the high-frequency signal device 1 configured as described above, the received signal from the receiving antenna 2 is converted to a frequency lower than the received signal after the desired signal is selected by the receiving unit 3, and the signal processing unit 6. Is output.

  On the other hand, the reception signal of the transmission / reception antenna 4 is converted to a frequency lower than the reception signal after the desired signal is selected by the transmission / reception unit 5 and output to the signal processing unit 6. In the signal processing unit 6, video and audio are reproduced by the video display unit 7 and the audio output unit 8. A signal from the voice input unit 9 is input to the signal processing unit 6. The output signal from the signal processing unit 6 is supplied to the transmission / reception unit 5 and then transmitted from the transmission / reception antenna 4.

  As described above, the receiving antenna 2 is connected to the input of the receiving unit 3 that receives a television broadcast signal. A transmission / reception antenna 4 is connected to an input of a transmission / reception unit 5 for transmitting / receiving a cellular phone signal.

  Television broadcasts in Japan use 470 MHz to 770 MHz as UHF signals. For example, in order to receive 500 MHz of this UHF signal, the length of the receiving antenna 2 needs to be about 15 cm, which is approximately ¼ wavelength with respect to this wavelength.

  On the other hand, the transmission / reception antenna 4 is for transmitting and receiving a transmission / reception signal of about 850 MHz. Therefore, the length of the transmission / reception antenna 4 is required to be about 8.8 cm, which is approximately ¼ wavelength with respect to the wavelength of 850 MHz.

  Thus, the two antennas 2 and 4 of the receiving antenna 2 having a length of about 15 cm and the transmitting / receiving antenna 4 having a length of about 8.8 cm are used.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2003-188952 A

  However, in the conventional high-frequency signal device 1 that receives or transmits using these two different frequency bands, the frequency bands used for the receiving unit 3 or the transmitting / receiving unit 5 are different, so that the dedicated antennas 2 and 4 are used. It was necessary to install.

  Therefore, the present invention solves this problem, and although it is a single antenna, it is a small-sized antenna that can receive or transmit / receive signals by using an antenna that is used as a quarter wavelength for high-frequency signals in two different frequency bands. Is intended to provide.

  To achieve this object, an antenna of the present invention is provided at a second antenna element having one end connected to the other end of the first antenna element and at the other end of the second antenna element. And a second terminal for receiving or transmitting / receiving a signal in the second frequency band, and a first terminal connected between the other end of the first antenna element and one end of the second antenna element. A frequency blocking circuit; and a second frequency blocking circuit connected between the other end of the second antenna element and the second terminal, wherein the first frequency blocking circuit includes the first frequency blocking circuit And the second frequency blocking circuit blocks the signal of the first frequency band and blocks the signal of the second frequency band. Let the signal pass, and The electrical length of the tenor element and the second antenna element connected in series is approximately a quarter wavelength with respect to the center frequency of the first frequency band, and the electrical length of the second antenna element is The length is approximately a quarter wavelength with respect to the center frequency of the second frequency band.

  As described above, according to the present invention, the antenna is provided at the other end of the second antenna element, with the second antenna element having one end connected to the other end of the first antenna element. And a second terminal for receiving or transmitting / receiving a signal in the second frequency band, and a first terminal connected between the other end of the first antenna element and one end of the second antenna element. A frequency blocking circuit; and a second frequency blocking circuit connected between the other end of the second antenna element and the second terminal, wherein the first frequency blocking circuit includes the first frequency blocking circuit And the second frequency blocking circuit blocks the signal of the first frequency band and blocks the signal of the second frequency band. A signal is passed through the first antenna; The electrical length of the element and the second antenna element connected in series is set to about a quarter wavelength with respect to the center frequency of the first frequency band, and the electrical length of the second antenna element This is approximately one-quarter wavelength with respect to the center frequency of the second frequency band.

  As described above, the antenna includes the first antenna element, the first frequency blocking circuit, the second antenna element, and the second frequency blocking circuit in order from the first terminal to the second terminal. Is provided. Thus, an antenna in the first frequency band is formed by the electrical length of the first antenna element and the second antenna element connected in series, and an antenna in the second frequency band is formed by the second antenna element. Yes.

  Accordingly, by using the second antenna element in common with one antenna, it is possible to realize a miniaturized antenna capable of receiving or transmitting / receiving high frequency signals of two different frequencies.

  In addition, since high-frequency signals having two different frequencies can be received or transmitted / received by an antenna used as a quarter wavelength, an antenna having high-sensitive reception performance and transmission performance with low transmission loss can be obtained.

(Embodiment 1)
Hereinafter, the first embodiment will be described with reference to the drawings. FIG. 1 is a circuit diagram of the high-frequency signal device according to the first embodiment. In FIG. 1, the high-frequency signal device 10 includes an antenna module 11, a receiver 12 having an input terminal 12 a connected to a terminal 11 a of the antenna module 11, and an input terminal 13 a connected to a terminal 11 b of the antenna module 11. The transmission / reception unit 13 includes the reception unit 12 and a signal processing unit 14 to which the output terminals 12b and 13b of the transmission / reception unit 13 are connected.

  In the high-frequency signal device 10, for example, the reception frequency of the reception unit 12 is set to UHF (470 MHz to 770 MHz) as an example of the first frequency band, and the transmission / reception frequency of the transmission / reception unit 13 is set to PDC800 (about The case where 820 MHz to 900 MHz) is used will be described below.

  The antenna module 11 includes an antenna 15 provided with terminals 15a and 15b, an amplifying unit 17 connected to the terminal 15a, a terminal 11a connected to the output of the amplifying unit 17, and one connected to the terminal 15b. And the terminal 11b to which the other of the matching unit 18 is connected.

  The antenna 15 includes, in order from the terminal 15a to the terminal 15b, an antenna element 19, a parallel circuit 22 including an inductor 20 and a capacitor 21 (used as an example of a first frequency blocking circuit), an antenna element 23, A parallel circuit 26 (used as an example of a second frequency blocking circuit) including an inductor 24 and a capacitor 25 is connected.

  The amplification unit 17 is provided with an input terminal 17a and an output terminal 17b. Between the input terminal 17a and the output terminal 17b, a matching device 27 for reducing the matching loss with the antenna 15, an amplifier 28 for amplifying the received signal, and an attenuator 29 composed of resistors are connected in this order. Has been.

  The operation of the antenna module 11 configured as described above will be described.

  First, the operation of the antenna 15 will be described. In this antenna 15, the parallel resonance frequency of the parallel circuit 22 is set to 860 MHz, for example. This 860 MHz is approximately the center frequency of 820 MHz to 900 MHz. Further, the parallel resonance frequency of the parallel circuit 26 is set to 620 MHz, for example. This 620 MHz is approximately the center frequency of 470 MHz to 770 MHz.

  As a result, the parallel circuit 22 has a small impedance value near 620 MHz, but a large impedance value near 860 MHz. On the contrary, the parallel circuit 26 has a large impedance value near 620 MHz, but a small impedance value near 860 MHz.

  Therefore, the antenna element 19 is connected to the antenna element 23 via the parallel circuit 22 at a high frequency in the vicinity of 620 MHz. Further, the antenna element 23 is separated from the terminal 15b by the parallel circuit 26 at high frequency. That is, the antenna element 19 and the antenna element 23 are connected in series to the terminal 15a in the vicinity of 620 MHz in terms of high frequency. Furthermore, one end 23a of the antenna element 23 can be opened at high frequencies. Thus, a UHF band signal around 620 MHz received by the antenna elements 19 and 23 connected in series is input to the amplifying unit 17 via the terminal 15a.

  Here, for example, in order to receive 620 MHz of the UHF signal, the entire length constituted by the antenna elements 19 and 23 is 12 cm, which is a quarter wavelength. The antenna elements 19 and 23 are arranged substantially in a straight line. Thereby, the length by the antenna elements 19 and 23 can be obtained by adding the respective lengths.

  On the other hand, the terminal 15b is connected to the antenna element 23 via the parallel circuit 26 at a high frequency in the vicinity of 860 MHz, and is separated from the antenna element 19 by the parallel circuit 22 at a high frequency. Thereby, the terminal 15b is connected to the antenna element 23 in high frequency. Further, the other end 23b of the antenna element 23 can be opened at a high frequency. Thereby, the transmission / reception signal used in the transmission / reception unit 13 is transmitted / received by the antenna element 23.

  Here, for example, in order to transmit / receive PDC800 (about 820 MHz to 900 MHz), the length of the antenna element 23 is 8.7 cm which is a quarter wavelength. Thereby, the length of the antenna element 19 can be set to 3.3 cm obtained by subtracting the length of the antenna element 23 from 8.7 cm from 12 cm obtained by adding the lengths of the antenna elements 19 and 23.

  For the antenna elements 19 and 23, a microstrip line can also be used. In this case, the propagation speed is slowed by the dielectric constant of the substrate constituting the microstrip line, and the wavelength is shortened. Thereby, since the length of the antenna elements 19 and 23 can be shortened, the antenna 15 can be miniaturized.

  In this case, the impedance can be approximated to a low impedance of, for example, 75Ω by the line width of the microstrip line, the distance from the microstrip line to the ground, and the dielectric constant of the substrate. As a result, for example, when the amplifier 28 having an input impedance close to 75Ω is used, the matching unit 27 can be omitted, so that downsizing and cost reduction are possible. Similarly, when the transmission / reception unit 13 having an input impedance close to 75Ω is used, the matching unit 18 can be dispensed with, so that downsizing and cost reduction are possible.

  As described above, although one antenna 15 is used, reception or transmission / reception can be performed with a quarter wavelength for high-frequency signals having two different frequencies.

  In particular, even if a transmission signal from the transmission / reception unit 13 exists at the terminal 15b, the parallel circuit 22 suppresses leakage to the terminal 15a. Thus, the transmission signal from the transmission / reception unit 13 does not leak to the reception unit 12 via the antenna 15. Accordingly, the receiving unit 12 is less likely to be disturbed by the transmission signal from the transmitting / receiving unit 13.

  Note that a filter may be newly provided between the parallel circuit 22 and the amplifier 28 in order to suppress the transmission signal used in the transmission / reception unit 13. Thereby, the receiving unit 12 is not further disturbed by the transmission signal from the transmitting / receiving unit 13.

  Furthermore, an element capable of varying an inductance value or a capacitance value can be used for at least one of the inductors 20 and 24 and the capacitors 21 and 25 constituting the parallel circuits 22 and 26. Thereby, since the blocking frequency of the parallel circuits 22 and 26 can be varied, the blocking frequency can be optimized according to the frequency of the transmission / reception signal.

  Furthermore, an element that switches an inductance value or a capacitance value can be used as at least one of the inductors 20 and 24 and the capacitors 21 and 25 constituting the parallel circuits 22 and 26. For example, an inductor 20a (not shown) is connected in series to the inductor 20, an electronic switch connected in parallel to the inductor 20a is provided, and the inductance value is switched by this electronic switch. Alternatively, a capacitor 21a (not shown) is connected in parallel to the capacitor 21, an electronic switch connected in series to the capacitor 21a is provided, and the capacitance value is switched by this electronic switch. Thereby, since the stop frequency of the parallel circuits 22 and 26 can be switched, a stop frequency can be optimized according to the frequency of a transmission / reception signal.

  Next, operations of the matching unit 27 and the amplifier 28 constituting the amplification unit 17 will be described. FIG. 2A is a circuit diagram of the matching unit 27. That is, the capacitor 27c is connected between the input 27a and the output 27b of the matching unit 27, and the inductor 27d is connected between the output 27b and the ground. The matching unit 27 is inserted in order to reduce the matching loss between the antenna 15 and the amplifier 28 and reduce the matching loss of the received signal.

  FIG. 2B shows the impedance on the Smith chart. For example, the antenna 15 has an impedance 30a having a large resistance component at the UHF frequency. This is because the length of the antenna element 23 is 7 cm, which is shorter than a quarter wavelength. The input impedance of the amplifier 28 is, for example, an impedance 30b close to 75 ohms (hereinafter referred to as Ω).

  The impedance 30a is rotated counterclockwise along the constant resistance circle 30c by a capacitor 27c connected in series with the signal line. As a result, it moves to the impedance 30d.

  FIG. 2C shows the impedance on the admittance chart. The impedance 30d is rotated counterclockwise along the constant conductance circle 30e by the inductor 27d connected to the ground. As a result, it is possible to move to the impedance 30b.

  In this way, by moving the impedance using the capacitor 27c and the inductor 27d, the impedance of the antenna 15 viewed from the output 27b of the matching device 27 can be approximated to the input impedance of the amplifier 28.

  That is, the output impedance of the antenna 15 viewed from the terminal 15a and the input impedance of the amplifier 28 can be matched. Thereby, the received signal received by the antenna 15 can be input to the amplifier 28 with a small matching loss. Therefore, the reception sensitivity of the antenna is improved.

  Next, the operation of the attenuator 29 constituting the amplifying unit 17 will be described. FIG. 3 is a circuit diagram of the attenuator 29 inserted between the amplifier 28 and the output terminal 17b. The attenuator 29 has an input 29a and an output 29b.

  The attenuator 29 includes a resistor 29c connected between the inputs 29a and 29b, a resistor 29d connected between the input 29a and the ground, and a resistor 29e connected between the output 29b and the ground. . By using a pie-type attenuator with these resistors 29c, 29d, and 29e, the output impedance of the amplifying unit 17 can be approximated to, for example, 75Ω of only the resistance component regardless of the frequency. It should be noted that the configuration of the パ イ (pie) attenuator may be a T (tee) attenuator.

  Thus, even if the input impedance of the receiving unit 12 varies greatly depending on the reception channel, the matching loss between the antenna module 11 and the receiving unit 12 can be made constant. Thereby, the receiving sensitivity between channels can be made constant.

  For example, if the resistance 29c is 47Ω, the resistance 29d is 330Ω, and the resistance 29e is 330Ω, the attenuation can be 4 dB. Further, by appropriately selecting these values, the attenuation amount of the attenuator 29 can be appropriately set.

  Further, since the input level to the receiving unit 12 such as a tuner connected to the terminal 11a can be made appropriate by the attenuator 29, distortion in the receiving unit 12 can be reduced.

  Next, the operation of the matching unit 18 will be described. The matching unit 18 is used to reduce matching loss between the antenna unit 15 and the transmission / reception unit 13. The basic circuit and operation of the matching unit 18 are the same as those of the matching unit 27. Thus, by reducing the matching loss between the antenna 15 and the transmission / reception unit 13, the reception sensitivity can be improved and the transmission efficiency can be increased.

  As described above, although one antenna 15 is used, reception or transmission / reception can be performed as a quarter-wavelength antenna 15 for high-frequency signals having two different frequencies. Accordingly, it is possible to realize the antenna 15 having a high sensitivity reception performance and a good transmission efficiency while being a small size.

  In the antenna module 11, the terminals 11 a and 11 b are connected to the terminals 15 a and 15 b of the antenna 15 via the amplification unit 17 and the matching unit 18. Thereby, it is possible to realize the antenna module 11 that enables a higher sensitivity reception performance and better transmission efficiency while being a small size.

  Further, in the high-frequency signal device 10, the reception unit 12 and the transmission / reception unit 13 are connected to the terminals 11 a and 11 b of the antenna module 11. Further, the demodulated signals from the receiving unit 12 and the transmitting / receiving unit 13 are supplied to the signal processing unit 14. Thereby, it is possible to realize the high-frequency signal device 10 having high sensitivity reception performance and good transmission efficiency while having a small size.

  In the present embodiment, the case where one terminal 15a of the antenna 15 is used as a UHF receiving antenna and the other terminal 15b is used as a transmitting / receiving antenna of the PDC 800 has been described. The reception signal of this receiving antenna is the same for signals other than UHF signals. Further, the transmission / reception signal of the transmission / reception antenna is the same except for the PDC 800.

  Further, an amplifying unit 31 (not shown) having the same function as the amplifying unit 17 is used instead of the matching unit 18, and a receiving unit 32 (not shown) having the same function as the receiving unit 12 is used instead of the transmitting / receiving unit 13. It may be used. The reception frequency of the reception unit 32 may be higher than that of the reception unit 12, and the blocking frequency of the parallel circuit 22 may be the reception frequency of the reception unit 32. Then, the length of the antenna element 23 is set to a quarter wavelength of the reception frequency of the reception unit 32, and the added length of the antenna elements 23 and 19 is set to a quarter wavelength of the reception frequency of the reception unit 12.

  Thereby, although it is one antenna 15, it becomes possible to receive or transmit / receive high frequency signals of two different frequencies as the antenna 15 having a quarter wavelength. Accordingly, it is possible to realize an antenna 33 (not shown) having a high sensitivity reception performance and a good transmission efficiency while being a small size.

(Embodiment 2)
Hereinafter, the second embodiment will be described. FIG. 4 is a circuit diagram of the high-frequency signal device 54 according to the second embodiment. The antenna module 11 in the first embodiment is connected to the receiving unit 12 and the transmitting / receiving unit 13. On the other hand, the antenna module 55 according to the second embodiment is different in that the transmission / reception units 13 and 56 are connected. In addition, the same number is attached | subjected about the same thing as FIG. 1, and the description is simplified.

  In the high-frequency signal device 54, for example, the transmission / reception frequency of the transmission / reception unit 13 is PDC800 (820 MHz to 900 MHz), and the transmission / reception frequency of the transmission / reception unit 56 is PDC1500 (1429 MHz to 1516 MHz).

  4, the high-frequency signal device 54 includes an antenna module 55, a transmission / reception unit 56 in which the input terminal 56a is connected to the terminal 55a of the antenna module 55, and a transmission / reception in which the input terminal 13a is connected to the terminal 55b of the antenna module 55. Unit 13 and a signal processing unit 58 to which the output terminals 13b and 56b of the transmission / reception units 13 and 56 are respectively connected.

  The antenna module 55 is provided between the antenna 60, terminals 60a and 60b provided on the antenna 60, a matching unit 57 connected between the terminals 60a and 55a, and between the terminals 60b and 55b. The matching unit 18.

  The antenna 60 includes an antenna element 61, a parallel circuit 64 including an inductor 62 and a capacitor 63, an antenna element 65, an inductor 66 and a capacitor 67 in order from the terminal 60b to the terminal 60a. A parallel circuit 68 is connected.

  Further, the matching unit 57 is used to match the antenna 60 and the transmission / reception unit 56 in the same manner as the matching unit 18.

  The operation of the antenna module 55 configured as described above will be described below. First, the operation of the antenna 60 will be described.

  In this antenna 60, the parallel resonance frequency of the parallel circuit 64 is set to 1472 MHz, for example. This 1472 MHz is approximately the center frequency of 1429 MHz to 1516 MHz. Further, the parallel resonance frequency of the parallel circuit 68 is set to 860 MHz, for example. This 860 MHz is approximately the center frequency of 820 MHz to 900 MHz.

  As a result, the parallel circuit 64 has a large impedance value near 1472 MHz, but a small impedance value near 860 MHz. On the other hand, the parallel circuit 68 has a large impedance value near 860 MHz, but has a small impedance value near 1472 MHz.

  Therefore, the antenna element 61 connected to the terminal 60b is connected to the antenna element 65 via the parallel circuit 64 at high frequency in the vicinity of 860 MHz, and is separated from the terminal 60a by the parallel circuit 68 at high frequency. . That is, in the terminal 60b, the antenna elements 61 and 65 are connected in series in terms of high frequency in the vicinity of 860 MHz. Further, one end 65a of the antenna element 65 can be opened at a high frequency. Thereby, the transmission / reception signal used in the transmission / reception unit 13 is transmitted / received by the antenna elements 61 and 65.

  Here, in order to transmit and receive PDC800 (820 to 900 MHz), the overall length constituted by the antenna elements 19 and 23 is 8.7 cm, which is a quarter wavelength of 860 MHz. The antenna elements 19 and 23 are arranged substantially in a straight line. Thereby, the length by the antenna elements 19 and 23 can be obtained by adding the respective lengths.

  On the other hand, the terminal 60a is connected to the antenna element 65 via the parallel circuit 68 at a high frequency in the vicinity of 1472 MHz, and is separated from the antenna element 61 by the parallel circuit 64 at a high frequency. Thereby, the terminal 60a is connected to the antenna element 65 in high frequency. Furthermore, the other end 65b of the antenna element 65 can be opened at high frequencies. Thereby, the transmission / reception signal used in the transmission / reception unit 56 is transmitted / received by the antenna element 65.

  Here, for example, in order to transmit / receive PDC 1500 (1429 MHz to 1516 MHz), the length of the antenna element 65 is 5 cm, which is a quarter wavelength. Thereby, the length of the antenna element 61 can be set to 3.7 cm obtained by subtracting the length of 5 cm of the antenna element 65 from 8.7 cm obtained by adding the lengths of the antenna elements 61 and 65.

  Note that a microstrip line may be used for the antenna elements 61 and 65. In this case, the propagation speed is slowed by the dielectric constant of the substrate constituting the microstrip line, and the wavelength is shortened. Thereby, since the length of the antenna elements 61 and 65 can be shortened, the antenna 60 can be miniaturized.

  In this case, the impedance can be approximated to a low impedance of, for example, 75Ω by the line width of the microstrip line, the distance from the microstrip line to the ground, and the dielectric constant of the substrate. Thereby, when the transmission / reception units 13 and 56 having an input impedance close to 75Ω are used, the matching units 18 and 57 can be dispensed with, so that downsizing and cost reduction are possible.

  As described above, although one antenna 60 is used, it is possible to transmit / receive high-frequency signals having two different frequencies as the antenna 60 having a quarter wavelength.

  In particular, even if a transmission signal from the transmission / reception unit 13 is present at the terminal 60b, the parallel circuit 68 suppresses leakage to the terminal 60a. Thereby, the transmission / reception unit 56 is not disturbed by the transmission signal from the transmission / reception unit 13.

  On the other hand, even if a transmission signal from the transmission / reception unit 56 exists at the terminal 60a, the parallel circuit 64 suppresses leakage to the terminal 60b. Thereby, the transmission / reception unit 13 is not disturbed by the transmission signal from the transmission / reception unit 56.

  A filter for suppressing a transmission signal used in the transmission / reception unit 13 may be newly provided between the parallel circuit 68 and the input terminal 56a. Similarly, a filter for suppressing a transmission signal used in the transmission / reception unit 56 may be newly provided between the parallel circuit 64 and the input terminal 13a.

  As described above, although it is one antenna 60, it is possible to transmit and receive high-frequency signals having two different frequencies as the antenna 60 having a quarter wavelength. Therefore, it is possible to realize the antenna 60 having a high sensitivity reception performance and a good transmission efficiency while being a small size.

  Next, the operation of the antenna module 55 will be described. The matching unit 18 is used to reduce matching loss between the antenna 60 and the transmission / reception unit 13. The matching unit 57 is used to reduce matching loss between the antenna 60 and the transmission / reception unit 56. The basic circuit and operation of the matching unit 57 are the same as those of the matching unit 18.

  As described above, the matching units 18 and 57 can reduce the matching loss between the antenna 60 and the transmitting and receiving units 13 and 56, respectively. Thereby, it is possible to realize the antenna module 55 having high sensitivity reception performance and good transmission efficiency while being small in size.

  Further, in the high-frequency signal device 54, the transmission / reception units 56 and 13 are connected to the terminals 55a and 55b of the antenna module 55, respectively. Further, the demodulated signals from these transmission / reception units 56 and 13 are supplied to a signal processing unit 58. Thereby, it is possible to realize the high-frequency signal device 54 having a high sensitivity reception performance and a good transmission efficiency while being a small size.

  In the present embodiment, the case where the antenna 60 is used as the transmission / reception antenna of the PDC 800 and the transmission / reception antenna of the PDC 1500 has been described. The signal of this transmitting / receiving antenna is the same even when a device other than PDC800 or PDC1500 is used.

  Furthermore, the antenna 60, the antenna module 55, and the high-frequency signal device 54 configured as described above have the same effects as those of the first embodiment.

(Embodiment 3)
Hereinafter, the third embodiment will be described. FIG. 5 is a perspective view when the high-frequency signal device 10 according to the first embodiment is used as a mobile phone. In addition, the same number is attached | subjected about the same thing as FIG. 1, and the description is simplified.

  In FIG. 5, the configuration of the high-frequency signal device 71 will be described. That is, the input terminal 12 a of the receiving unit 12 is connected to the terminal 11 a at one end of the antenna module 11. The input terminal 13a of the transmission / reception unit 13 is connected to the terminal 11b at the end opposite to the terminal 11a. The receiving unit 12 and the output terminals 12b and 13b of the transmitting / receiving unit 13 are connected to the signal processing unit 14, respectively. Further, a video display unit 73, a speaker 74, and a microphone 75 are connected to the signal processing unit 14.

  These antenna module 11, receiving unit 12, transmitting / receiving unit 13, signal processing unit 14, video display unit 73, speaker 74, and microphone 75 are configured in the same casing 76.

  Thus, when the receiving unit 12 and the transmitting / receiving unit 13 are arranged in the same casing 76, a large transmission signal from the transmitting / receiving unit 13 is output. It is important that this large transmission signal flows into the input terminal 12a of the receiver 12 so that the receiver 12 is not disturbed. Therefore, the following considerations are taken.

  That is, the terminal 11a of the antenna module 11 and the input terminal 12a of the receiving unit 12 are arranged close to each other, and the terminal 11b of the antenna module 11 and the input terminal 13a of the transmitting / receiving unit 13 are arranged close to each other. Moreover, the receiving part 12 and the transmission / reception part 13 are arrange | positioned in a straight line form (each output is adjoining). Thereby, since the antenna module 11, the receiving part 12, the transmission / reception part 13, and the signal processing part 14 can be arrange | positioned closely, mounting in a small area is attained.

  Further, the signal processing unit 14 generates an unnecessary harmonic signal such as a clock signal. When this unnecessary harmonic signal flows into the antenna module 11, the input terminal 12 a of the receiver 12, and the input terminal 13 a of the transmitter / receiver 13, the receiver 12 may be disturbed. It is important to prevent this interference.

  For this purpose, the input terminals 14 a and 14 b of the signal processing unit 14 are arranged close to the output terminal 12 b of the reception unit 12 and the output terminal 13 b of the transmission / reception unit 13. Thereby, the level of the unnecessary radiation from these connection parts can be reduced. Further, the receiving unit 12 and the transmitting / receiving unit 13 are arranged between the antenna module 11 and the signal processing unit 14. Thereby, the space | interval of the antenna module 11 and the signal processing part 14 can be spaced apart, and also a shielding effect will be produced by storing the receiving part 12 and the transmitting / receiving part 13 in a metal case.

  As described above, the input unit of each of the input terminals 12a and 13a of the receiving unit 12 and the transmitting / receiving unit 13 is moved away from the antenna module 11, and the receiving unit 12 and the input unit of the transmitting / receiving unit 13 are connected to the antenna module. It is important that the eleven terminals 11a and 11b are arranged close to each other.

  Thereby, the receiving unit 12 is not disturbed by the transmitting / receiving unit 13, and the antenna module 11, the receiving unit 12, and the transmitting / receiving unit 13 are not disturbed by the signal processing unit 14.

  In the third embodiment, the reception unit 12 and the transmission / reception unit 13 have been described. However, when the reception unit 32 is used instead of the transmission / reception unit 13, or like the high-frequency signal device 54 of the second embodiment. The same applies when the transmission / reception unit 56 is used instead of the reception unit 12.

  The antenna according to the present invention, the antenna module using the antenna, and the high-frequency signal device have an effect of providing a portable high-frequency signal device by using a small-sized antenna that can receive or transmit / receive two different frequencies. Therefore, it is useful as a high-frequency signal device such as a cellular phone in which portability is particularly important.

1 is a block diagram of a high-frequency signal device according to Embodiment 1 of the present invention. (A) Circuit diagram of matching unit, (b) Smith chart of antenna and matching unit, (c) Same as above, Admittance chart of antenna and matching unit Same as above, attenuator circuit diagram Block diagram of a high-frequency signal device according to Embodiment 2 of the present invention The perspective view of the high frequency signal apparatus in Embodiment 3 of this invention Block diagram of a conventional high-frequency signal device

Explanation of symbols

DESCRIPTION OF SYMBOLS 15 Antenna 15a terminal 15b terminal 19 Antenna element 22 Parallel circuit 23 Antenna element 26 Parallel circuit

Claims (10)

In an antenna for receiving or transmitting / receiving a signal in a first frequency band and a signal in a second frequency band different from the first frequency band, the antenna includes a first antenna element and the first antenna element. A second antenna provided at one end and having a first terminal for receiving or transmitting / receiving a signal in the first frequency band, and having one end connected to the other end of the first antenna element An element, a second terminal provided at the other end of the second antenna element and receiving or transmitting / receiving a signal in the second frequency band, the other end of the first antenna element, and the second A first frequency blocking circuit connected between one end of the second antenna element and a second frequency blocking connected between the other end of the second antenna element and the second terminal. Circuit and And the first frequency blocking circuit allows the signal of the first frequency band to pass and blocks the signal of the second frequency band, and the second frequency blocking circuit includes the first frequency band. The first antenna element and the second antenna element are electrically connected in series to block the signal in the first frequency band while blocking the signal in the band and passing the signal in the second frequency band. An antenna having a wavelength that is approximately a quarter of the center frequency, and an electrical length of the second antenna element that is approximately a quarter of the wavelength of the center frequency of the second frequency band. The first frequency blocking circuit is a first parallel circuit composed of a first inductor and a first capacitor, and the second frequency blocking circuit is a second parallel circuit composed of a second inductor and a second capacitor. The antenna according to claim 1. The antenna according to claim 2, wherein the resonance frequency of at least one of the first and second parallel circuits is variable. The antenna according to claim 2, wherein at least one element of the first inductor, the second inductor, the first capacitor, and the second capacitor is switched by an electronic switch so that the blocking frequency can be switched. The antenna according to claim 1, an input connected to the first terminal of the antenna, a first amplifying unit that performs matching and amplification with the antenna, and an output of the first amplifying unit are connected An antenna provided with a third terminal, a first matching unit connected to the second terminal of the antenna, and a fourth terminal connected to the other of the first matching unit module. 6. The antenna module according to claim 5, wherein a second amplifying unit that performs matching and amplification with the antenna is provided between the second and fourth terminals instead of the first matching unit. The antenna module according to claim 5, wherein a second matching unit is provided between the first and third terminals instead of the first amplifying unit. A high-frequency signal device in which one of a reception unit and a transmission / reception unit is connected to the third and fourth terminals of the antenna module according to claim 5. The high-frequency signal device according to claim 8, wherein the antenna module, the reception unit, and the transmission / reception unit are configured in the same housing, wherein the reception unit or the transmission / reception unit has their input sides separated from each other, and each output side. Are arranged close to each other, and the receiving unit and the input terminal of the transmitting / receiving unit are arranged close to the third and fourth terminals of the antenna module. The high-frequency signal device according to claim 9, wherein a signal processing unit is connected to an output terminal of the reception unit or the transmission / reception unit, and the signal processing unit is disposed close to the reception unit or the transmission / reception unit and disposed on the opposite side of the antenna module.

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