JP2005318272A - Receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver enhancing the gain of a λ/4 resonance antenna by ensuring the ground size smoothly through a simple arrangement. <P>SOLUTION: A sleeve antenna 20 is employed as a λ/2 resonance antenna and a contact piece 18 is brought into contact with the outer skin conductor (central pipe 202) of the sleeve antenna 20. The contact piece 18 is connected with the ground layer of a portable telephone substrate 10. Since the ground size of the portable telephone substrate 10 is extended by an amount of the outer skin conductor (central pipe 202, short ring 205, sleeve antenna element 204) of the sleeve antenna 20, the gain of a chip antenna, i.e. the λ/4 resonance antenna 30, can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a receiving apparatus, and is particularly suitable for use when performing space diversity reception.

  As a means for reducing the influence of fading, space diversity reception is widely used in mobile terminals such as mobile phones.

  In such diversity reception, two antennas that are spatially separated are arranged in a mobile terminal, and each antenna receives radio waves whose instantaneous fluctuations are independent from each other, and selectively switches each received signal or enters a reception state. A reception signal having a sufficiently large size is obtained by synthesizing at a corresponding ratio.

  One of these two antennas is advantageously a chip antenna such as a dielectric antenna from the viewpoint of small size and power saving. In mobile phones that are currently popular, space diversity reception is generally performed using a chip antenna (dielectric antenna) mounted on a substrate and a whip antenna mounted on a housing.

For example, the following patent documents 1 and 2 are known as prior arts for performing diversity reception using different types of antennas.
JP 62-49729 A JP 2001-119239 A

  Since the above-described chip type antenna is a quarter wavelength resonance type antenna, the ground size greatly affects the gain of the antenna.

  In digital television broadcasting that is currently being standardized, the frequency band used is 470 to 770 MHz, which is lower than the frequency band of mobile phones (800 MHz). Since the frequency band is different, the wavelength of the received radio wave becomes longer. For this reason, it is difficult to obtain a sufficient antenna gain with a ground size similar to that of an existing mobile phone.

Therefore, an object of the present invention is to provide a receiving apparatus that can solve such problems and can ensure a ground size smoothly with a simple configuration, thereby improving antenna gain.

  According to a first aspect of the present invention, in a receiving device including at least a first antenna and a second antenna, the first antenna is configured by a ¼ wavelength resonance antenna, and the second antenna is a sleeve antenna. And the outer conductor of the sleeve type antenna and the ground of the 1/4 wavelength resonance type antenna are connected to a common ground element.

  According to a second aspect of the present invention, in the receiving apparatus according to the first aspect of the invention, the quarter wavelength resonant antenna is configured by mounting a chip type antenna on a substrate, and the sleeve type antenna has an outer skin. The conductor is connected to the ground of the substrate.

  According to a third aspect of the present invention, in the receiving device according to the first or second aspect, the sleeve type antenna is arranged so as to be slidable in the longitudinal direction with respect to the housing, and a contact piece connected to the ground is provided. The contact piece is configured to be slid while being in contact with the outer conductor when the sleeve type antenna is slid by being brought into contact with the outer conductor while being elastically biased.

  According to a fourth invention, in the receiving device according to any one of the first to third inventions, the outer conductor is provided via a current phase adjustment circuit for increasing the gain of the first antenna. It is connected to the ground element.

  According to a fifth aspect of the present invention, in the receiving apparatus according to any one of the first to fourth aspects of the invention, diversity reception is performed using the received signal from the first antenna and the received signal from the second antenna. And a tuner circuit for performing the above.

The features of the present invention will become more apparent from the following description of embodiments. However, the following embodiment is merely one embodiment of the present invention, and the meaning of the term of the present invention or each constituent element is not limited to that described in the following embodiment. Absent.

  According to the first invention, since the outer conductor of the sleeve type antenna is connected to the ground element to which the first antenna (¼ wavelength resonance type antenna) is connected, the ground size of the first antenna is The sleeve type antenna can be made larger by the outer conductor, and the gain of the first antenna (quarter wave resonance type antenna) can be improved by extending the ground size.

  Here, the first antenna can be configured by mounting a chip antenna on a substrate as in the second invention. This is advantageous in reducing the size and power consumption, and can increase the technical effect of the receiving apparatus. However, the first invention is not limited to such a configuration.

  Further, according to the third invention, the sleeve type antenna can be accommodated in the casing or pulled out from the casing, and the external shape can be made compact. At this time, even if the sleeve type antenna is slid and accommodated in the case or pulled out of the case, the contact piece slides on the outer case conductor so that the outer case conductor of the sleeve type antenna is disconnected from the ground. Therefore, the expanded state of the ground size can be maintained.

  According to the fourth invention, the outer conductor is connected to the ground element via the current phase adjustment circuit for increasing the gain of the first antenna (quarter wave resonance type antenna). The gain of one antenna (quarter wave resonance type antenna) can be increased more effectively.

  The present invention is preferably applied to a diversity receiver as in the fifth aspect. However, the present invention is not limited to application to a diversity receiver.

The actions and effects of these inventions will become more apparent from the following description of embodiments.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a configuration of a mobile phone according to an embodiment. As shown in the figure, the mobile phone according to the present embodiment includes a mobile phone board 10, a mobile phone transmission / reception circuit 11, a diversity reception tuner 12, a TV (TV) reproduction circuit 13, a diplexer 14, and a current phase adjustment circuit. 15, matching circuits 16 and 17, contact pieces 18 and 19, a sleeve antenna 20, and a chip antenna 30.

  The mobile phone board 10 is a circuit board on which various circuits necessary for executing the functions of the mobile phone are mounted. As shown in FIG. 2, the cellular phone substrate 10 is configured by laminating a circuit layer 101, a wiring layer 102, a ground layer 104, and a base layer 104. Among them, the circuit layer 101 includes circuit elements such as a cellular phone transmission / reception circuit 11, a diversity reception tuner 12, a TV (TV) reproduction circuit 13, a diplexer 14, a current phase adjustment circuit 15, matching circuits 16 and 17, and a chip antenna 30. Is implemented. In the wiring layer 102, each circuit and a wiring pattern for connecting the circuit and the ground layer 103 are formed. A conductive material layer is formed on the ground layer 103 over the entire surface. The ground size of the mobile phone substrate 10 is an area corresponding to the size of the ground layer 103.

  Returning to FIG. 1, the mobile phone transmission / reception circuit 11 performs modulation / demodulation processing and the like of call data transmitted and received during a call. Diversity reception tuner 12 receives television radio waves using two antennas, sleeve antenna 20 and chip antenna 30, during TV (television) reproduction, and outputs television data acquired thereby to TV reproduction circuit 13. The TV reproduction circuit 13 processes the television data input from the diversity reception tuner 12 to generate a television signal, and outputs this to a display unit (not shown) of the mobile phone.

  The diplexer 14 discriminates the received signal from the sleeve antenna 20 according to the frequency and outputs it to a corresponding circuit (the mobile phone transmission / reception circuit 11 or the diversity reception tuner). The current phase adjustment circuit 15 adjusts the phase of the reception signal received by the sleeve antenna 20 so that the gain of the chip antenna 30 is maximized. That is, the received signal received by the sleeve antenna 20 is phase-shifted so that the gain of the chip antenna 30 is maximized. The matching circuits 16 and 17 perform impedance matching for the sleeve antenna 20 and the chip antenna 30, respectively.

  The contact piece 18 is a plate-like flexible metal piece disposed on the mobile phone board 10 (circuit layer 101), and protrudes to the side of the mobile phone board 10 by a predetermined amount. When mounted on the housing, the sleeve antenna 20 is pressed against the surface of the outer conductor of the sleeve antenna 20 (in this embodiment, the center pipe 202: described later) in a bent state. The contact piece 18 is connected to the ground of the mobile phone substrate 10 via the current phase adjustment circuit 15.

  The contact piece 19 is a plate-like flexible metal piece disposed on the mobile phone board 10 (circuit layer 101), and protrudes to the side of the mobile phone board 10 by a predetermined amount. When mounted on the housing, it is fixed to the surface of the conductor of the sleeve antenna 20 (in this embodiment, the sliding cylinder 211: described later). The contact piece 19 is connected to the matching circuit 16.

  The sleeve antenna 20 is attached to the casing of the mobile phone so as to be adjacent to the mobile phone substrate 10. Here, the sleeve antenna 20 is mounted on the housing so as to be slidable in the longitudinal direction by an antenna holder (not shown). The configuration of the sleeve antenna 20 will be described in detail later with reference to FIG.

  The chip antenna 30 is configured by a dielectric antenna or the like, and is mounted on the cellular phone substrate 10 so as to be separated from the sleeve antenna 20 as much as possible in order to smoothly perform diversity reception. The ground of the chip antenna 30 uses the ground layer 103 of the mobile phone substrate 10.

  FIG. 3 shows the configuration of the sleeve antenna 20. 1A is a basic configuration diagram (longitudinal sectional view) of the sleeve antenna, and FIG. 1B is a diagram (vertical sectional view) showing a specific configuration example.

  As shown in FIG. 2A, the sleeve antenna 20 is configured to enclose a conducting wire 201 in a sleeve type antenna element 204. Here, the conductive wire 201 is enclosed in a conductive center pipe 202 in a state insulated by an insulating inner cylinder 203, and further, a sleeve is connected to the center pipe 202 via a conductive short ring 205. A mold antenna element 204 is attached. The conducting wire 201 protrudes from the upper side of the center pipe 202, and the protruding amount is set to about ¼ of the wavelength λ in the used frequency band. The length of the sleeve type antenna element 204 is also set to about ¼ of the wavelength λ.

  In the present embodiment, as shown in FIG. 5B, an insulating tube 206 is fixed to the upper end of the short ring 205, and a λ / 4 antenna element 207 is fitted and fixed to the inner periphery of the insulating tube 206. Conducted. A cap 208 is fixed to the upper end of the λ / 4 antenna element 207.

  An insulating outer cylinder 209 is fixed between the outer periphery of the center pipe 202 and the inner periphery of the sleeve type antenna element 204, and an insulating cylinder 210 is fixed to the lower part of the insulating outer cylinder 209. Further, a conductive sliding cylinder 211 is mounted on the inner periphery of the lower portion of the insulating inner cylinder 203 so as to be able to slide on the inner periphery of the insulating inner cylinder 203 and is electrically connected to the conductor 201. When the sliding cylinder 211 slides on the inner periphery of the insulating inner cylinder 203, the contact piece at the lower end of the conducting wire 201 slides inside the sliding cylinder 211 while contacting the inner periphery of the sliding cylinder 211.

  FIG. 4 shows a state where the mobile phone substrate 10 and the sleeve antenna 20 are mounted on the external housing 40 of the mobile phone. 2A shows a state where the sleeve antenna 20 is housed in the housing 40, and FIGS. 2B and 2C show a state where the sleeve antenna 20 is gradually pulled out from the housing 40. FIG. Show.

  As shown in FIG. 5A, when the mobile phone board 10 and the sleeve antenna 20 are mounted on the housing 40, the contact piece 18 disposed on the mobile phone board 10 is bent and the center pipe 202 is The contact piece 19 is pressed against the outer periphery, and the contact piece 19 is fixed to the outer periphery of the sliding cylinder 211. Therefore, the center pipe 202 is grounded to the ground layer 103 of the mobile phone substrate 10 via the current phase adjustment circuit 15 as shown in FIG. 1, and the conducting wire 201 is connected to the matching circuit via the sliding cylinder 211. 16 is connected.

  When the cap 208 is pulled from this state, the sleeve antenna 20 slides upward, and the λ / 4 antenna element 206 is gradually pulled out (see FIGS. 2B and 2C). At this time, the contact piece 18 slides on the center pipe 202 while being pressed against the outer periphery of the center pipe 202, and the sliding cylinder 211 slides on the inner periphery of the insulating inner cylinder 203 while Since it is gradually pulled out from the cylinder 203, the electrical connection between the contact pieces 18, 19 and the central pipe 202 and the sliding cylinder 211 is maintained.

  FIG. 5 shows the configuration of the diversity reception tuner 12.

  As shown in the figure, the diversity reception tuner 12 includes two tuner units 121 and 122, a synthesis control unit 123, and a signal synthesis unit 124.

  The tuner unit 121 demodulates the received signal from the sleeve antenna 20 and outputs it to the synthesis control unit 123 and the signal synthesis unit 124. The tuner unit 122 demodulates the received signal from the chip antenna 30 and outputs it to the synthesis control unit 123 and the signal synthesis unit 124. The synthesis control unit 123 monitors the state of the signals input from the tuner units 121 and 122 and outputs the synthesis ratio of these two signals to the signal synthesis unit 124. The signal synthesis unit 124 adds and synthesizes the signals from the tuner units 121 and 122 according to the synthesis ratio acquired from the synthesis control unit 123, and outputs the synthesized television data to the TV playback circuit 13.

  As described above, according to the present embodiment, since the ground layer 103 of the mobile phone substrate 10 and the center pipe 202 of the sleeve antenna 20 are electrically connected, the ground size of the mobile phone substrate 10 is set to the sleeve type antenna element 204. It can be expanded by the amount of the short ring 205 and the center pipe 202, and thereby the gain of the chip antenna 30 that is a λ / 4 resonance antenna can be increased.

  Further, according to the above embodiment, since the sleeve antenna 20 can be housed in the housing 40, the outer shape of the mobile phone can be made compact, and when the sleeve antenna 20 is pulled out from the housing 40, In addition, since the contact of the contact pieces 18 and 19 to the center pipe 202 and the sliding cylinder 211 is maintained, the expanded state of the ground size can be maintained, and radio waves can be transmitted and received by the sleeve antenna 20.

  Needless to say, the present invention is not limited to the above-described embodiment, and various other modifications are possible.

  For example, in the above embodiment, the sleeve antenna 20 is mounted on the housing 40 in a slidable state. However, the sleeve antenna 20 is mounted on the housing with the λ / 4 antenna element 206 exposed to the outside. You may make it adhere to 40. In the above description, the chip antenna is a dielectric antenna, but other λ / 4 resonance antennas such as an inverted F antenna can also be used.

  In the above embodiment, when the contact piece 19 is fixed to the outer periphery of the sliding cylinder 211 and the sleeve antenna 20 is pulled out, the sliding cylinder 211 slides on the inner periphery of the insulating inner cylinder 203, thereby Although the connection state of the piece 19 and the sliding cylinder 211 is maintained, the contact piece 19 is brought into pressure contact with the outer periphery of the sliding cylinder 211 and the sliding cylinder 211 is fixed to the inner periphery of the insulating inner cylinder 203, so that When the contact piece 19 is pulled out, the contact piece 19 may slide on the outer periphery of the sliding cylinder 211 so that the connection state between the contact piece 19 and the sliding cylinder 211 may be maintained. However, in this case, since it is necessary to project the sliding cylinder 211 downward from the insulating inner cylinder 203 by an amount corresponding to the drawing stroke of the sleeve antenna 20, the longitudinal dimension of the sleeve antenna 20 increases. Therefore, in order to make the sleeve antenna 20 or the cellular phone compact, it is preferable that the sliding cylinder 211 slides on the inner periphery of the insulating inner cylinder 203 as shown in the above embodiment.

  Further, in the above-described embodiment, the contact piece 18 is brought into contact with the center pipe 202 of the sleeve antenna 20, but may be brought into contact with the sleeve type antenna element 204.

The embodiment of the present invention can be appropriately modified in various ways within the scope of the technical idea shown in the claims.

The figure which shows the structure of the mobile telephone which concerns on embodiment The figure which shows the structure of the mobile telephone board | substrate 10 which concerns on embodiment. The figure which shows the structure of the sleeve antenna 20 which concerns on embodiment. The figure which shows the state where the sleeve antenna and the cellular phone board are attached to the housing The figure which shows the structure of the diversity reception tuner 12 which concerns on embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mobile phone board | substrate 12 Diversity receiving tuner 15 Current phase adjustment circuit 18, 19 Contact piece 20 Sleeve antenna 30 Chip antenna 103 Ground layer 201 Conductor 202 Center pipe 205 Short ring 204 Sleeve type antenna element 211 Sliding cylinder

Claims (5)

In a receiving device including at least a first antenna and a second antenna,
The first antenna is composed of a quarter wavelength resonant antenna, the second antenna is composed of a sleeve type antenna, and the outer conductor of the sleeve type antenna is coupled to the quarter wavelength resonant antenna. Type antenna ground connected to a common ground element,
A receiving apparatus. In claim 1,
The quarter-wave resonant antenna is configured by mounting a chip-type antenna on a substrate, and the sleeve-type antenna has an outer conductor connected to the ground of the substrate.
A receiving apparatus. In claim 1 or 2,
The sleeve type antenna is arranged to be slidable in the longitudinal direction with respect to the casing, and the sleeve type antenna slides by bringing a contact piece connected to the ground into contact with the outer conductor while being elastically biased. Sometimes the contact piece is configured to slide while contacting on the outer conductor,
A receiving apparatus. In any one of Claims 1 thru | or 3,
The outer conductor is connected to the ground element via a current phase adjustment circuit for increasing the gain of the first antenna.
A receiving apparatus. In any one of Claims 1 thru | or 4,
A tuner circuit that performs diversity reception using a reception signal from the first antenna and a reception signal from the second antenna;
A receiving apparatus.

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