CN1354899A - Transmitting and receiving antenna - Google Patents
Transmitting and receiving antenna Download PDFInfo
- Publication number
- CN1354899A CN1354899A CN00807038A CN00807038A CN1354899A CN 1354899 A CN1354899 A CN 1354899A CN 00807038 A CN00807038 A CN 00807038A CN 00807038 A CN00807038 A CN 00807038A CN 1354899 A CN1354899 A CN 1354899A
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- mentioned
- helical antenna
- transmitting
- bias voltage
- antenna
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- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000010267 cellular communication Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/06—Details
- H01Q9/14—Length of element or elements adjustable
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
A transmitting and receiving antenna is provided for use with a portable terminal device for satellite or surface communications. Varactor diodes are provided on feeders to the elements of a helical antenna. The electrical length of the antenna can be changed by changing the bias voltage applied to the varactor diodes depending on whether it is used for transmission or reception, so that the transmitting and receiving antenna can be resonant to both transmission and reception frequencies.
Description
Technical field
The present invention relates to be used to carry out the antenna assembly of the transmit-receive sharing on the portable terminal of satellite communication and ground communication.
Background technology
Fig. 4 is the dual-mode antenna device that existing portable terminal uses.Among Fig. 4, the 1st, 4 coils of wire that are used for circularly polarised wave around the emission helical antenna, the 2nd, 4 coils of wire that are used for circularly polarised wave equally around the reception helical antenna.The 3rd, to the distributor of emission with helical antenna 1 power supply, the 4th, the transmitter that the high output amplifier that is transmitted by output etc. constitutes.The 5th, to receiving the synthesizer that the received signal that received with helical antenna 2 is synthesized, the 6th, the receiver that constitutes by low noise amplifier etc.
Now, the operation of the transmitting-receiving in this existing dual-mode antenna device is described.Transmitting of emission system filters out unwanted ripple and after too high output is amplified, is input in the distributor 3 in transmitter 4.This transmits, and by the delay voltage in distributor 3, is assigned to 4 signals with 0 °, 90 °, 180 ° and 270 ° phase difference, and be input to 4 coils of wire around emission with in the helical antenna 1.Here, long with the circuit of the feeder line of helical antenna 1 to emission from 4 outputs of distributor 3, no matter which bar in 4 lines all has identical length, thereby each antenna element of emission usefulness helical antenna 1, all has identical line length.If the wavelength of transmitted wave is λ
1, then the length by each antenna element is λ
1/ 4,3 λ
1/ 4 ..., each antenna element resonance on tranmitting frequency just can utilize above-mentioned phase difference, the emission circularly polarised wave.Synthesizer 5 in the receiving system is to synthesize 4 circularly polarised wave signals that coil received that receive with helical antenna 2 by the phase difference that 0 °, 90 °, 180 ° and 270 ° are set.If the wavelength of received signal is λ
2, then reception is λ with the length of each antenna element of helical antenna 2
2/ 4,3 λ
2/ 4 ..., each antenna element resonance on receive frequency just can receive circularly polarised wave by synthetic above-mentioned phase difference is set.
If transmitting-receiving frequency difference but frequency is close then can be formed in the helical antenna that has the transmit-receive sharing of gain on the frequency band that covers the receiving-transmitting sides frequency band.But, under the different situation of transmitting-receiving frequency, and think under the situation of gain of optimization transmitting-receiving, must be provided with respectively emission with and receive usefulness 2 helical antennas, must be on the physical size that meets emission or receive frequency with the length setting of the antenna element of each helical antenna.
But, utilize various ground based cellular communication systems and artificial satellite etc. to develop portable satellite formula telephone system recently, particularly developed the double mode or multimodal portable terminal that utilizes a portable terminal and can between a plurality of communication bodies, communicate.Must set the frequency of portable terminal transmitting-receiving electric wave according to communication system respectively, for example under the situation of the portable terminal that communicates between 2 communication systems, must have and be used for 4 corresponding antennas of frequency of receiving and transmitting signal.
As mentioned above, in the employed antenna assembly of existing portable terminal, under the different situation of transmitting-receiving frequency and under the situation that antenna gain is optimized, must be provided with respectively to transmit and receive and use helical antenna, thereby there is the problem that maximizes in portable terminal.And, for the portable terminal of between some communication systems, receiving and dispatching,, must have some kinds of helical antennas, thereby can cause the problem that portable terminal maximizes equally for receiving and transmitting signal between such communication system.
The present invention is in order to address the above problem, the duplexer device that provides the portable terminal that constitutes according to the helical antenna for the common use of the different some electric waves of frequency institute to use.
Disclosure of an invention
Relevant duplexer device of the present invention comprises: the helical antenna of transmit-receive sharing; Be arranged on the variable capacitance diode on the feeder line of the antenna element that is used for this helical antenna; And when transmitting and receiving, switch the reverse bias voltage that is applied on this variable capacitance diode, switch the bias voltage switching device shifter of the signal band of receiving and dispatching by helical antenna.Therefore, might change when emission and when receiving the resonance frequency of shared helical antenna, might improve the frequency characteristic of antenna on transmitting and receiving.
And, for above-mentioned variable capacitance diode, preferably its negative pole is arranged on antenna element one side of helical antenna, for above-mentioned bias voltage switching device shifter, preferably put a resistor, thereby reverse bias voltage is provided by being sidelong at the negative pole one of variable capacitance diode.Ifs circuit is to constitute like this, then owing to be placed with resistor between feeder line and voltage input end, makes the impedance of voltage input end one side become big, thereby the loss of the receiving and transmitting signal of propagating by this feeder line diminishes.
In addition,, its negative pole one side is placed on antenna element one side of helical antenna,, preferably puts a coil, a reverse bias voltage is provided by being sidelong at variable capacitance diode negative pole one for above-mentioned bias voltage switching device shifter for above-mentioned variable capacitance diode.Ifs circuit is to constitute like this, then because the coil that exists between feeder line and voltage input end, can realize the coupling of voltage input end one side and helical antenna, thereby the loss of the receiving and transmitting signal that can propagate by this feeder line diminishes.
And, according to duplexer device of the present invention, have: the transmitting-receiving circularly polarised wave shared 4 coils of wire around helical antenna; 4 signals that generation distributes by transmitting, generate to the phase difference of 4 distributing signals and by the distribution synthesizer of second delay line synthesizing from the received signal of helical antenna via first delay line; The variable capacitance diode that between helical antenna and distribution synthesizer, is provided with; When transmitting and receiving, the reverse bias voltage that imposes on this variable capacitance diode is switched, and switching is by the bias voltage switching device shifter of the frequency band of helical antenna receiving and transmitting signal.Thus, with regard to the transmitting-receiving of circularly polarised wave with regard to the shared helical antenna, the resonance frequency when transmitting and receiving is changed, thereby, can improve the frequency characteristic of antenna when transmitting and receiving.
And, according to duplexer device of the present invention, have: the transmitting-receiving circularly polarised wave shared 4 coils of wire around helical antenna; 4 signals that generation distributes by transmitting, generate the phase difference of 4 distributing signals via delay circuit, and, by the distribution synthesizer of the synthetic received signal from helical antenna of delay line; For each of each antenna element of helical antenna, and distribute 4 variable capacitance diodes placing between the synthesizer; The bias voltage switching device shifter that when transmitting and receiving, the reverse bias voltage that is applied to these 4 variable capacitance diodes is switched, the frequency band of the signal of helical antenna transmitting-receiving is switched.The reverse bias voltage that is applied when launching and receive via the bias voltage switching device shifter all is different to each antenna element.Thus, with regard to the circularly polarised wave signal is received and dispatched with regard to the shared helical antenna, the resonance frequency when transmitting and receiving is changed, thereby, might improve the frequency characteristic of antenna when transmitting and receiving.
And duplexer device related to the present invention has: the helical antenna of transmit-receive sharing; The variable capacitance diode of between feeder line of powering and earth point, installing to the antenna element of this helical antenna; When transmitting and receiving, switch the reverse bias voltage that is applied on this variable capacitance diode, the bias voltage switching device shifter that the frequency band of helical antenna receiving and transmitting signal is switched.Thus, when transmitting and receiving, might be by the coupling between variable capacitance diode and the helical antenna, and the resonance frequency of antenna is changed, thereby, improve the frequency characteristic of antenna when transmitting and receiving.
Description of drawings
Fig. 1 is the block diagram (embodiment 1) that has shown according to the structure of duplexer device of the present invention.
Fig. 2 is the block diagram (embodiment 2) that has shown according to the structure of duplexer device of the present invention.
Fig. 3 is the block diagram (embodiment 3) that has shown according to the structure of duplexer device of the present invention.
Fig. 4 is the block diagram that has shown the structure of existing antenna assembly.
Be used to realize the best mode invented
Embodiment 1
Fig. 1 is the structured flowchart that has shown according to the duplexer device of the embodiment of the invention 1.The 7th, the helical antenna of transmit-receive sharing, the 8th, the variable capacitance diode that on feeder line, designs to helical antenna 7.Be this variable capacitance diode 8 of each design in each antenna element of helical antenna 7, its negative pole and antenna element one side are connected in series.9 is first voltage input ends, and 10 is second voltage input ends, the 11st, and the switch of switched voltage input 9 and voltage input end 10.The 12nd, be connected the resistor of variable capacitance diode 8 negative poles one side, the other end of this resistor links to each other with switch 11.The 13rd, be connected the resistor of variable capacitance diode 8 anodal sides.The 14th, to the distribution synthesizer of helical antenna 7 power supply, the 15th, circulator, the 16th, the transmitter that constitutes by high output amplifier etc., the 17th, the receiver that constitutes by low noise amplifier etc.
Transmit in transmitter 16,, and, be input to distribution synthesizer 14 via circulator 15 by high output amplification by the useless ripple of elimination.Utilize circulator 15, can prevent transmits sneaks in the receiver 17.Transmit consistent and distribute to requisite number purpose power supply signal by distributing synthesizer 14, making, and, power to helical antenna 7 via feeder line with the antenna element number of packages of helical antenna 7.Under the situation of Fig. 1, be divided into 4.On the other hand, be synthesized in distributing synthesizer 14 from the received signal of helical antenna 7, and, be input to receiver 17, carry out low noise and amplify, and be input to not shown signal processing part via circulator 15.Utilize circulator 15, can prevent that received signal from sneaking into transmitter 16.
Utilize and distribute transmitting of synthesizer 14 distribution, via variable capacitance diode 8, to each antenna element power supply of helical antenna 7.Between variable capacitance diode 8 positive poles and negative pole,, apply reverse bias voltage from voltage input end 9 or voltage input end 10 via switch 11.The capacitance of variable capacitance diode 8 changes according to this reverse bias voltage value.The resonance frequency of helical antenna 7 depends on the capacitance of this variable capacitance diode 8, and the electrical length of each antenna element of helical antenna 7, and so, in case electric capacitance change then, resonance frequency also changes.Because the voltage that is applied by voltage input end 9 and voltage input end 10 differs from one another, so can constitute by means of diverter switch 11 at the antenna that receives and launch resonance under the different frequency.For example, when gating is launched, by switch 11, apply reverse bias voltage from voltage input end 9 to variable capacitance diode 8, when gating received, diverter switch 11 with by switch 11, applied reverse bias voltage from voltage input end 10 to variable capacitance diode 8.In this time of reception, also the same with above-mentioned emission situation, by between the positive pole of variable capacitance diode 8 and negative pole, applying reverse bias voltage, thereby determined that this antenna carries out the resonance frequency when receiving from voltage input end 10.The received signal of utilizing helical antenna 7 to receive after being synthesized, is input to receiver 17 via circulator 15 in distributing synthesizer 14.
Here, resistor 12 is set, providing reverse bias voltage to variable capacitance diode 8, and, with respect to the impedance of transmission line, fully improving impedance, loss of signal diminishes.Resistance 13 is set, makes the positive pole of generation variable capacitance diode 8 and the potential difference between negative pole, its anodal end ground connection with respect to transmission line impedance, is fully improved impedance, and loss of signal diminishes.
In Fig. 1, voltage supply circuit use resistor 12 and resistor 13 being used for applying to variable capacitance diode 8 reverse bias voltage also can be placed into these resistors on the coil.By using this coil, can make to mating between each unit that applies the set voltage supply circuit of bias voltage and plus earth circuit and helical antenna, the emission effciency of antenna is uprised.This moment, said voltage supply circuit be the circuit that is made of the voltage input end among Fig. 19, voltage input end 10, switch 11, resistor 12, and the plus earth circuit was the circuit by impedor 13.
In addition, although Fig. 1 has shown the helical antenna 7 of 4 coils of wire under situation, even if this helical antenna 7 are 2 coils of wire around helical antenna, can utilize foregoing circuit too, constitute this embodiment.Use 2 coils of wire around the situation of helical antenna under owing to can reduce the quantity of antenna element, thus can reduce the number of the variable capacitance diode 8 that is connected on each antenna element, thereby make the antenna assembly miniaturization.
Embodiment 2
Fig. 2 is the block diagram that has shown according to the structure of the duplexer device of the present invention the 2nd embodiment.In Fig. 2, the 18th, its inside has the distribution synthesizer of delay circuit, in the drawings, has the delay circuit of the phase difference that generates 0 °, 90 °, 180 ° and 270 °.On the other hand, in Fig. 2, with the circuit that is marked with same-sign among Fig. 1, expression and the identical or corresponding part of the circuit shown in Figure 1 of relevant embodiment 1.
This embodiment is characterised in that: in order to form circularly polarised wave, as mentioned above, in distributing synthesizer 18, be assigned as 4 signals with offering transmitting of helical antenna 7, the phase difference of 0 °, 90 °, 180 ° and 270 ° is provided to these 4 signals that distribute.Received signal has via the delay circuit with phase difference, and the feature that in distributing synthesizer 18, is synthesized.When transmitting-receiving, use under the situation of different frequency, the circuit that this phase difference is provided is arranged, for example be in distributing synthesizer 18, the consistent delay circuit of frequency when designing with emission, when emission, because frequency difference, the phase place of the signal that is synthesized are also different, produced phase error in the received signal.
For the helical antenna device of transmitting-receiving circularly polarised wave, in order to reduce the phase error of receiving and dispatching on the delay circuit, be preferably in and distribute in the synthesizer 18, be provided with respectively and make the delay circuit that transmits and pass through, and the delay circuit that received signal is passed through.When circuit is when constituting like this, distribute the delay circuits in the synthesizer 18 to become big, solved the problem of phase error.
Do not increasing the delay circuit that distributes in the synthesizer 18, and under the shared situation that makes the delay line that receiving and transmitting signal passes through, owing to provide reverse bias voltage on each antenna element, to have different values to variable capacitance diode 8, therefore, can reduce the phase error of receiving and transmitting signal.Distributing the delay circuit in the synthesizer 18, is shared for transmitting and receiving, and for the side in the receiving and transmitting signal, is by phase difference is provided for this delay circuit that transmits for example, the delay line formation of 0 °, 90 °, 180 ° and 270 °.Thereupon, utilize this delay line to come synthesized received signal, because the frequency difference of receiving and transmitting signal, so phase place is inconsistent.In order to compensate this phase deviation, the reverse bias voltage that applies on will 4 variable capacitance diodes 8 corresponding to each antenna element of helical antenna 7 is set at the value that has nothing in common with each other, and makes the capacitance of 4 variable capacitance diodes 8 be respectively different values.In above-mentioned example, owing to designed delay circuit, make that 4 phase differences when emission are 0 °, 90 °, 180 ° and 270 °, so the reverse bias voltage will launch the time, for example be the value of power input 9, it is identical being set on 4 variable capacitance diodes 8.During reception, must revise phase error, the value that imposes on 4 power inputs 10 of 4 variable capacitance diodes 8 is set at different values.
Like this, suppose that the capacitance of variable capacitance diode 8 is different values at each antenna element place of helical antenna 8, then resonance frequency has a little skew.With do not allow the electric capacitance change of variable capacitance diode 8, and transmitting of different frequency of transmitting-receiving compared with the situation of received signal, the skew of resonance frequency has diminished.
Embodiment 3
Fig. 3 is the block diagram that has shown according to the structure of the duplexer of the embodiment of the invention 3.In Fig. 3, the 19th, be connected in series in the capacitive element on the feeder line of helical antenna 7.The 20th, in a side of the helical antenna 7 of capacitive element 19, be connected the variable capacitance diode between feeder line and the earth point.In addition, in Fig. 3, has the circuit of the mark identical, the identical or appropriate section of expression and circuit shown in Fig. 1 of relevant embodiment 1 with Fig. 1.
Between the positive pole and negative pole of variable capacitance diode 20,, be applied with reverse bias voltage from voltage input end 9 and voltage input end 10 by switch 11.Utilize this reverse bias voltage, the capacitance of variable capacitance diode 20 is changed,, the resonance frequency of antenna is changed, tranmitting frequency or receive frequency are changed by the coupling between each antenna element of this capacitance and helical antenna 7.
Claims (6)
1. the antenna assembly of transmit-receive sharing is characterized in that comprising:
The helical antenna of transmit-receive sharing; The variable capacitance diode that in the feeder line of the antenna element of this helical antenna, is provided with; When transmitting and receiving, switch the reverse bias voltage, the bias voltage switching device shifter that are applied on this variable capacitance diode so that the signal band that utilizes above-mentioned helical antenna transmitting-receiving is switched.
2. according to the described duplexer device of claim 1, it is characterized in that: above-mentioned variable capacitance diode, its negative pole are arranged on antenna element one side of above-mentioned helical antenna; Above-mentioned bias voltage switching device shifter by being arranged on the resistor of above-mentioned variable capacitance diode negative pole one side, provides reverse bias voltage.
3. according to the described duplexer device of claim 1, it is characterized in that: above-mentioned variable capacitance diode, its negative pole one side is arranged on antenna element one side of above-mentioned helical antenna; Above-mentioned bias voltage switching device shifter, the coil by being provided with on above-mentioned variable capacitance diode negative pole provides reverse bias voltage.
4. the antenna assembly of transmit-receive sharing is characterized in that comprising: when the transmitting and receiving of circularly polarised wave signal shared 4 coils of wire around helical antenna; 4 signals that generation distributes from transmitting, by first delay line, produce phase difference to above-mentioned 4 signals that distribute, and, via the distribution synthesizer of second delay line to synthesizing from the received signal of above-mentioned helical antenna; The variable capacitance diode that between above-mentioned helical antenna and above-mentioned distribution synthesizer, is provided with; When transmitting and receiving, the reverse bias voltage that is applied on this variable capacitance diode is switched the bias voltage switching device shifter that the signal band by the transmitting-receiving of above-mentioned helical antenna is switched.
5. the antenna assembly of transmit-receive sharing is characterized in that having: when the transmitting and receiving of circularly polarised wave signal shared 4 coils of wire around helical antenna; 4 signals that generation distributes from transmitting utilize delay line, produce the phase difference at above-mentioned 4 signals that distribute, and, by the distribution synthesizer of above-mentioned delay line to synthesizing from the received signal of above-mentioned helical antenna; 4 variable capacitance diodes that are provided with between in each antenna element of above-mentioned helical antenna each and the above-mentioned distribution synthesizer; And the reverse bias voltage that when transmitting and receiving these 4 variable capacitance diodes is applied switches the bias voltage switching device shifter that the signal band that above-mentioned helical antenna is received and dispatched switches; Utilize above-mentioned bias voltage switching device shifter, when making emission or when reception the reverse bias voltage that applied antenna element is had nothing in common with each other.
6. the antenna assembly of transmit-receive sharing is characterized in that comprising: transmitting-receiving shared helical antenna; The variable capacitance diode that between the feeder line of the antenna element of this helical antenna and earth point, is provided with; The reverse bias voltage that this variable capacitance diode of subtend is applied when transmitting and receiving switches, the bias voltage switching device shifter that the signal band that above-mentioned helical antenna is received and dispatched switches.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2000/001324 WO2001067551A1 (en) | 2000-03-06 | 2000-03-06 | Transmitting and receiving antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1354899A true CN1354899A (en) | 2002-06-19 |
Family
ID=11735755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00807038A Pending CN1354899A (en) | 2000-03-06 | 2000-03-06 | Transmitting and receiving antenna |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1182729A1 (en) |
| JP (1) | JP3669331B2 (en) |
| CN (1) | CN1354899A (en) |
| WO (1) | WO2001067551A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8125337B2 (en) | 2006-10-25 | 2012-02-28 | Nec Corporation | Communication apparatus and portable communication terminal using the same |
| CN102576938A (en) * | 2009-10-13 | 2012-07-11 | 索尼公司 | Antenna |
| CN104660751A (en) * | 2015-02-26 | 2015-05-27 | 惠州Tcl移动通信有限公司 | Antenna switch control method and system based on mobile terminal |
| CN105024677A (en) * | 2014-04-30 | 2015-11-04 | 恩智浦有限公司 | Rf switch circuit |
| CN110109082A (en) * | 2019-04-17 | 2019-08-09 | 天津大学 | A kind of Terahertz Active Radar imaging array of shared antenna |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58189638U (en) * | 1982-06-09 | 1983-12-16 | パイオニア株式会社 | Helical full loading whip antenna |
| JPH0539016U (en) * | 1991-10-17 | 1993-05-25 | アルプス電気株式会社 | Helical antenna |
| JPH06268564A (en) * | 1993-03-15 | 1994-09-22 | Hitachi Ltd | Portable radio telephone terminal equipment |
| JP3189735B2 (en) * | 1997-05-08 | 2001-07-16 | 日本電気株式会社 | Helical antenna |
-
2000
- 2000-03-06 CN CN00807038A patent/CN1354899A/en active Pending
- 2000-03-06 WO PCT/JP2000/001324 patent/WO2001067551A1/en not_active Application Discontinuation
- 2000-03-06 JP JP2001566219A patent/JP3669331B2/en not_active Expired - Fee Related
- 2000-03-06 EP EP00906707A patent/EP1182729A1/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8125337B2 (en) | 2006-10-25 | 2012-02-28 | Nec Corporation | Communication apparatus and portable communication terminal using the same |
| CN101529449B (en) * | 2006-10-25 | 2016-08-17 | 日本电气株式会社 | Communicator and the mobile terminals of this communicator of use |
| CN102576938A (en) * | 2009-10-13 | 2012-07-11 | 索尼公司 | Antenna |
| CN102576938B (en) * | 2009-10-13 | 2013-07-24 | 索尼公司 | Antenna |
| CN105024677A (en) * | 2014-04-30 | 2015-11-04 | 恩智浦有限公司 | Rf switch circuit |
| US11316515B2 (en) | 2014-04-30 | 2022-04-26 | Nxp B.V. | RF switch circuit |
| CN104660751A (en) * | 2015-02-26 | 2015-05-27 | 惠州Tcl移动通信有限公司 | Antenna switch control method and system based on mobile terminal |
| CN104660751B (en) * | 2015-02-26 | 2017-08-08 | 惠州Tcl移动通信有限公司 | A kind of duplexer control method and system based on mobile terminal |
| CN110109082A (en) * | 2019-04-17 | 2019-08-09 | 天津大学 | A kind of Terahertz Active Radar imaging array of shared antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3669331B2 (en) | 2005-07-06 |
| EP1182729A1 (en) | 2002-02-27 |
| WO2001067551A1 (en) | 2001-09-13 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |