CN101646030A - Circuit designing method for extending antenna bandwidth of analogue television - Google Patents
Circuit designing method for extending antenna bandwidth of analogue television Download PDFInfo
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- CN101646030A CN101646030A CN200910051367A CN200910051367A CN101646030A CN 101646030 A CN101646030 A CN 101646030A CN 200910051367 A CN200910051367 A CN 200910051367A CN 200910051367 A CN200910051367 A CN 200910051367A CN 101646030 A CN101646030 A CN 101646030A
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Abstract
The invention discloses a circuit designing method for extending the antenna bandwidth of an analogue television. The circuit comprises an antenna, two matching networks, an antenna switch and a television chip. A signal from an antenna is divided into two paths and respectively connected with two matching networks. When the antenna is debugged, two matching networks respectively aim to a VHF frequency band and a UHF frequency band to debug the antenna matching, each segment of bandwidth is decreased after the segment is carried out, an antenna switch is connected, and the antenna switch is controlled by a program and is switched between the VHF frequency band and the UHF frequency band. When the television receives the signal at the VHF frequency band, a control signal switches the antenna switch into an access corresponding to the VHF frequency band; and when the television receives the signal at the UHF frequency band, the control signal switches the antenna switch into an access corresponding to the UHF frequency band. The invention achieves the aim of favorable receiving performance at the VHF frequency band and the UHF frequency band.
Description
Technical field
The present invention relates to a kind of circuit design method, particularly relate to a kind of circuit design method of extending antenna bandwidth of analogue television.
Background technology
Along with the development of portable terminal and the progress of IC design, increasing function is integrated in the portable terminal.This traditional function of simulated television is because it has covering widely, free use cost to be liked that by increasing consumer each Terminal Design manufacturer has also released the portable terminal product that much comprises the simulated television function.
China's simulated television has 57 aerial transmitting channels and 43 additional channels, and frequency is covered as 48.5MHz-870MHz.57 aerial transmitting channels are divided into 48.5MHz-92MHz, 167MHz-223MHz, three frequency ranges of 470MHz-870MHz.Wherein 48.5MHz-92MHz, 167MHz-223MHz belong to VHF (Very high frequency, very high frequency(VHF)) frequency range, and 470MHz-870MHz belongs to UHF (Ultra High Frequency, hyperfrequency) frequency range.
At present, in the simulated television design of portable terminal, nearly all adopting telescopic antenna as stimulation TV antenna, mainly is because the frequency bandwidth that simulated television takies is too wide, from 48.5MHz-870MHz; The low channel frequency is lower, has only 48.5MHz.In order to satisfy receptivity, antenna must take very big volume.Consider the characteristic of portable terminal miniaturization, general built-in aerial is difficult to reach requirement, and telescopic antenna can change resonance point by adjusting length in addition all has good reception to reach on different channels.But when reality debugging test and use, these measures also are very limited to the improvement of antenna performance.The telescopic antenna of mobile simulated television, for easy to use, antenna can not be very long, generally at tens centimetres to three, 40 centimetres, even if three, 40 centimetres length, its low frequency performance still are difficult to guarantee, need debug resonance point by antenna-matching circuit.But for too wide frequency band, match circuit also is difficult to guarantee in whole 48.5MHz-870MHz frequency band less standing-wave ratio is arranged all, at present common way is: serve as main antenna debugging and the matching and debugging of carrying out with some frequency ranges wherein in the frequency that whole TV covers, abandon or take into account other frequency range.So just sacrificed the acceptable effect of band segment, the problem of bringing is in the frequency range of being abandoned or taking into account, and TV is difficult to reach reception well.
Summary of the invention
The technical problem to be solved in the present invention is the defective that is difficult to guarantee to have in the whole frequency band superperformance for the bandwidth that overcomes present portable terminal stimulation TV antenna existence is too wide, a kind of circuit design method of extending antenna bandwidth of analogue television is provided, utilize the characteristic of simulated television covering frequence frequency-division section, antenna is separately debugged coupling according to different frequency ranges, debug VHF frequency range and uhf band respectively, utilize the duplexer of single-pole double throw characteristic to switch to VHF frequency range or uhf band respectively then, to reach the purpose of in two frequency ranges, all wanting excellent reception performance.
The present invention solves above-mentioned technical problem by following technical proposals: a kind of circuit design method of extending antenna bandwidth of analogue television, it is characterized in that, this circuit comprises antenna, two matching networks, duplexer and TV chips, signal from antenna is divided into two-way, connect two matching networks respectively, during the antenna debugging, two matching networks are respectively at VHF and uhf band debugging antenna match, every section bandwidth reduces after the segmentation, connect duplexer then, duplexer is subjected to program control and switches between VHF, uhf band; When TV during in VHF frequency range received signal, a control signal switches to duplexer in the path of VHF frequency range correspondence; When TV during in the uhf band received signal, control signal switches to duplexer in the path of uhf band correspondence.
Preferably, described antenna is a telescopic antenna.
Preferably, described VHF frequency range adopts different matching networks with uhf band.
Preferably, described TV chip is by the switching of the automatic control antenna switch of control signal.
Preferably, described matching network is a л type matching network.
Positive progressive effect of the present invention is:
1, improved antenna performance, made that the simulated television reception is better, image and voice are more clear.
2, under the prerequisite that guarantees the antenna reception, this method for designing can reduce the design length of antenna, makes the easier miniaturization of portable terminal and attractive in appearance.
Description of drawings
Fig. 1 is the circuit design method schematic diagram of beamwidth of antenna expansion.
Fig. 2 is the duplexer schematic diagram.
Fig. 3 is the concrete circuit diagram of implementing.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
As shown in Figure 1, the circuit of this beamwidth of antenna expansion comprises antenna 11, first matching network 12, second matching network 13, duplexer 14 and TV chip 15, signal from antenna 11 is divided into two-way, connect two matching networks respectively, during the antenna debugging, at VHF, uhf band two antenna match are debugged the best respectively, because every section bandwidth reduces after the segmentation, the VHF wave band has only 48.5MHz--223MHz, and the UHF wave band has only 470MHz--870MHz.Less relatively bandwidth more can reduce standing-wave ratio when matching and debugging, the performance of easier raising antenna.Connect a duplexer then, duplexer is subjected to the control of program, can switch between VHF, uhf band.When TV in VHF frequency band search signal or when work, control signal 16 switches to duplexer in the path of VHF frequency range correspondence; When TV in uhf band search signal or when work, control signal 16 switches to duplexer in the path of uhf band correspondence.
As shown in Figure 1, be divided into two-way from the signal of antenna 11, antenna 11 is stimulation TV antenna, this stimulation TV antenna is a telescopic antenna, connect first matching network 12 and second matching network 13 respectively, keep л type matching network in the present embodiment, the value of capacitor and inductor is decided on the debugging situation.What first matching network 12 and second matching network 13 were corresponding respectively is VHF and uhf band.During VHF frequency range matching and debugging, telescopic antenna is all pulled out, take off duplexer 14 (its structure as shown in Figure 2), make the UHF path disconnect, first matching network 12 in TV VHF frequency range 48.5MHz--223MHz, is taken into account resonant bandwidth and standing-wave ratio with the resonant frequency point debugging.Because TV VHF frequency range (48.5MHz--223MHz) bandwidth 174.5MHz reduces greatly than the whole frequency of TV (48.5MHz--870MHz) bandwidth 821.5MHz, the easier raising of antenna performance.Among the design, with resonance point debugging near 150MHz, the coupling of use as shown in Figure 3, standing-wave ratio is 90MHz--190MHz less than 3 frequency range, can satisfy the use of the most of television channels of VHF frequency range.
After VHF frequency range matching and debugging is finished, second matching network 13 uses identical method debugging uhf band, resonant frequency point is debugged in TV uhf band 470MHz--870MHz, uhf band (470MHz--870MHz) bandwidth 400MHz reduces greatly than the whole frequency of TV (48.5MHz--870MHz) bandwidth 821.5MHz, relative bandwidth also reduces a lot, easier of debugging reduction standing-wave ratio, increase bandwidth range, improve antenna performance.Among the design, resonance point is debugged near 650MHz, the coupling of use such as Fig. 3, standing wave is 510MHz--790MHz less than 3 frequency range, considers the situation that the present television channel of China distributes, antenna performance can satisfy the use of uhf band television channel.After preliminary debugging is finished, can antenna match be optimized according to the acceptance test effect of reality.In the design, employed duplexer is the PE4259 that Peregrine Semiconductor company produces, and duplexer 14 is subjected to the control of program, can switch between VHF, uhf band.Its logic control is as shown in table 1 below:
The control truth table of table 1 duplexer
| Control voltage | Signal path |
| ??Pin?26＝VDD ??Pin?24＝High | ??RFC?to?RF1 |
| ??Pin?26＝VDD ??Pin?24＝Low | ??RFC?to?RF2 |
According to top control truth table, when TV need be in VHF frequency range received signal, 24 pin of duplexer 14 are put high level from the control signal 16 of TV chip 15, this moment, duplexer switched to the path of VHF frequency range correspondence; When TV during in the uhf band received signal, control signal 16 is put low level with 24 pin of duplexer 14, and duplexer 14 switches to the path of uhf band correspondence.
During the PCB design, duplexer and match circuit all design on circuit board, and the position of match circuit is as far as possible near duplexer, and the distance between the antenna feed point is also short as far as possible.
In the present embodiment, it is 220mm that employed telescopic antenna is pulled out total length, is 5 joints altogether, and contracted length is 55mm.Simulated television chip described in the present embodiment uses is the TLG1100 of safe scape company.
Coupling device described in the present embodiment is the high-frequency inductor and the electric capacity of 0402 encapsulation, and radio-frequency line is the radio frequency microstrip line.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these execution modes.Therefore, protection scope of the present invention is limited by appended claims.
Claims (5)
1, a kind of circuit design method of extending antenna bandwidth of analogue television, it is characterized in that, this circuit comprises antenna, two matching networks, duplexer and TV chips, signal from antenna is divided into two-way, connects two matching networks respectively, during the antenna debugging, two matching networks are respectively at VHF and uhf band debugging antenna match, every section bandwidth reduces after the segmentation, connects duplexer then, and duplexer is subjected to program control and switches between VHF, uhf band; When TV during in VHF frequency range received signal, a control signal switches to duplexer in the path of VHF frequency range correspondence; When TV during in the uhf band received signal, control signal switches to duplexer in the path of uhf band correspondence.
2, the circuit design method of extending antenna bandwidth of analogue television as claimed in claim 1 is characterized in that, described antenna is a telescopic antenna.
3, the circuit design method of extending antenna bandwidth of analogue television as claimed in claim 1 is characterized in that, described VHF frequency range adopts different matching networks with uhf band.
4, the circuit design method of extending antenna bandwidth of analogue television as claimed in claim 1 is characterized in that, described TV chip is by the switching of the automatic control antenna switch of control signal.
5, the circuit design method of extending antenna bandwidth of analogue television as claimed in claim 1 is characterized in that, described matching network is a л type matching network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910051367A CN101646030A (en) | 2009-05-15 | 2009-05-15 | Circuit designing method for extending antenna bandwidth of analogue television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910051367A CN101646030A (en) | 2009-05-15 | 2009-05-15 | Circuit designing method for extending antenna bandwidth of analogue television |
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| CN101646030A true CN101646030A (en) | 2010-02-10 |
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| CN200910051367A Pending CN101646030A (en) | 2009-05-15 | 2009-05-15 | Circuit designing method for extending antenna bandwidth of analogue television |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873382A (en) * | 2010-06-30 | 2010-10-27 | 深圳市经纬科技有限公司 | Mobile phone, and method and device for dynamically tuning television internal antenna thereof |
| CN102348003A (en) * | 2011-09-26 | 2012-02-08 | 惠州Tcl移动通信有限公司 | Mobile communication terminal and signal receiving device |
| CN102638285A (en) * | 2012-03-22 | 2012-08-15 | 上海华勤通讯技术有限公司 | Mobile terminal with television function |
| CN103079146A (en) * | 2012-12-27 | 2013-05-01 | 青岛歌尔声学科技有限公司 | Matching circuit for antenna of Bluetooth headset |
| CN103293403A (en) * | 2012-02-29 | 2013-09-11 | 比亚迪股份有限公司 | Method for debugging signal transduction and antenna |
| CN106961021A (en) * | 2017-03-14 | 2017-07-18 | 珠海市魅族科技有限公司 | The intelligent selecting method of intelligent selection module and terminal antenna frequency range |
| WO2022110309A1 (en) * | 2020-11-26 | 2022-06-02 | 捷开通讯(深圳)有限公司 | Antenna apparatus and mobile terminal |
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| CN2146085Y (en) * | 1993-01-20 | 1993-11-10 | 那鸿书 | Frequency mixing matching device for TV antenna |
| CN1284215A (en) * | 1997-12-05 | 2001-02-14 | 汤姆森许可公司 | VHF/UHF self-tuning planar antenna system |
| CN1604628A (en) * | 2003-09-30 | 2005-04-06 | 夏普株式会社 | Receiver device having improved selectivity characteristics |
| CN101540592A (en) * | 2008-03-18 | 2009-09-23 | 索尼株式会社 | Band-pass filter device, method of manufacturing same, television tuner, and television receiver |
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2009
- 2009-05-15 CN CN200910051367A patent/CN101646030A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2146085Y (en) * | 1993-01-20 | 1993-11-10 | 那鸿书 | Frequency mixing matching device for TV antenna |
| CN1284215A (en) * | 1997-12-05 | 2001-02-14 | 汤姆森许可公司 | VHF/UHF self-tuning planar antenna system |
| CN1604628A (en) * | 2003-09-30 | 2005-04-06 | 夏普株式会社 | Receiver device having improved selectivity characteristics |
| CN101540592A (en) * | 2008-03-18 | 2009-09-23 | 索尼株式会社 | Band-pass filter device, method of manufacturing same, television tuner, and television receiver |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873382A (en) * | 2010-06-30 | 2010-10-27 | 深圳市经纬科技有限公司 | Mobile phone, and method and device for dynamically tuning television internal antenna thereof |
| CN101873382B (en) * | 2010-06-30 | 2014-10-22 | 深圳市经纬科技有限公司 | Mobile phone, and method and device for dynamically tuning television internal antenna thereof |
| CN102348003A (en) * | 2011-09-26 | 2012-02-08 | 惠州Tcl移动通信有限公司 | Mobile communication terminal and signal receiving device |
| CN103293403A (en) * | 2012-02-29 | 2013-09-11 | 比亚迪股份有限公司 | Method for debugging signal transduction and antenna |
| CN103293403B (en) * | 2012-02-29 | 2015-08-26 | 比亚迪股份有限公司 | The adjustment method of a kind of intracellular signaling and antenna |
| CN102638285A (en) * | 2012-03-22 | 2012-08-15 | 上海华勤通讯技术有限公司 | Mobile terminal with television function |
| CN103079146A (en) * | 2012-12-27 | 2013-05-01 | 青岛歌尔声学科技有限公司 | Matching circuit for antenna of Bluetooth headset |
| CN106961021A (en) * | 2017-03-14 | 2017-07-18 | 珠海市魅族科技有限公司 | The intelligent selecting method of intelligent selection module and terminal antenna frequency range |
| WO2022110309A1 (en) * | 2020-11-26 | 2022-06-02 | 捷开通讯(深圳)有限公司 | Antenna apparatus and mobile terminal |
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Application publication date: 20100210 |