CN103872450A - Thin-film digital television receiving antenna - Google Patents
Thin-film digital television receiving antenna Download PDFInfo
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- CN103872450A CN103872450A CN201410103078.6A CN201410103078A CN103872450A CN 103872450 A CN103872450 A CN 103872450A CN 201410103078 A CN201410103078 A CN 201410103078A CN 103872450 A CN103872450 A CN 103872450A
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Abstract
The invention discloses a thin-film digital television receiving antenna which comprises a thin film conductor, a feed and a medium substrate. The thin film conductor (1) is in the shape of a foil belt. A flat plate antenna is formed by attaching an improved logarithm plane helical curve foil belt to the medium substrate (2). The antenna has the wide impedance bandwidth, the directional diagram and the impedance of the antenna are not correlated with the frequency in quite wide frequency band range and LHF, VHF and UHF full-channel receiving can be achieved. Meanwhile, the improved logarithm plane helical curve foil belt structure is adopted, the standing-wave ratio can be reduced to be lower than 2.5 and the receiving sensitivity and the anti-interference performance are improved. The thin-film digital television receiving antenna is small in size, light in weight, low in cost, easy to machine, manufacture and use, capable of being directly printed on the upper faces of a paper board, a plastic product and the like, capable of being directly stuck to a frame or a rear cover plate of a shell of a television and an upper cover plate of a set top box, capable of being arranged outdoors through a support and wide in application prospect.
Description
Technical field
The present invention relates to a kind of film digital television receiver antenna, belong to reception antenna technical field.
Background technology
Because the transmission frequency of China's terrestrial wireless digital tv network is 50MHZ-850MHZ, be divided into LHF, VHF, tri-frequency ranges of UHF, be divided into into 57 channels.Digital television receiver antenna adopts the linearly polarized antenna of electric dipole and magnetic dipole mostly at present, is generally pull bar and distressed structure thereof.The television receiving antenna of this structure generally adopts subsection setup, that is: LHF reception antenna part, VHF reception antenna part and UHF reception antenna part, actual is that Third Mate's antenna is passed through, after mixture of networks, to provide a delivery outlet, accesses television set by loop.Obviously, not only cost is high for this compound antenna, volume is large, use and adjust difficulty, and low, the poor anti jamming capability of gaining, reflection loss are large, and standing-wave ratio is generally greater than 3, make ghost image of the tv phenomenon serious, the most important thing is not reach the requirement that Digital Television needs broadband reception.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned prior art, provide that a kind of volume is little, standing-wave ratio good, receiving sensitivity and strong anti-interference performance and the wide film-type digital television receiver antenna of frequency acceptance band.
Its technical scheme is: a kind of film-type digital television receiver antenna, comprise thin film conductor, loop, medium substrate, it is characterized in that: described thin film conductor is foil shape, it is attached to and on medium substrate, is formed plate aerial by improved logarithm snail curve foil.
Its beneficial effect is: because logarithm flat helical antenna is ultra-wide band antenna, in the time that frequency is very low, spiral brachium with wavemeter is very short, radiation field is almost line polarization wave, along with the rising of operating frequency, or the increase of helix brachium, radiation field is progressively transitioned into elliptical polarization by linear polarization, and finally reaches circular polarization; When spiral arm length is at least a wavelength, when antenna radius at least equals quarter-wave, it is constant that the impedance of antenna and antenna pattern start to be tending towards, present frequency-independent antenna characteristic, therefore it has wider impedance bandwidth, its directional diagram and impedance in quite wide frequency band range and frequency-independent, can realize LHF, VHF, UHF all-channel receives; Simultaneously, adopt the structure of improved logarithm snail curve foil, standing-wave ratio is reduced to below 2.5, receiving sensitivity and interference free performance are improved, and make that its volume is little, quality is light, cost is low, be easy to processing and fabricating and use, both can directly be printed on above cardboard, plastic products etc., also can directly stick on the frame of housing of TV set or the upper cover plate of back shroud and Set Top Box, also can be arranged on by support outdoor.Have broad application prospects.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the A-A cutaway view of Fig. 1;
Fig. 3 is reception antenna directional pattern of the present invention;
Fig. 4 is the stationary wave characteristic of reception antenna of the present invention.
Embodiment
As shown in Figure 1, 2, a kind of film-type digital television receiver antenna, comprises thin film conductor, loop and medium substrate 3.Described thin film conductor 1 is foil shape, and it is attached on medium substrate 2 and is formed plate aerial by improved logarithm snail curve foil.
The spiral growth rate of described improved logarithm snail curve foil elects 0.1 as, and when spiral growth rate reduces, spiral arm curvature increases, and electric current accelerates along spiral arm decay, and band characteristic is better.
Described medium substrate 2 adopts glass-fiber-plate, paper or the plastic film etc. of DIELECTRIC CONSTANT ε ≈ 2.6, has on the one hand guaranteed that antenna size is not too large, and the frequency band that has simultaneously met antenna requires and be cheap.
Detect through experiment, because this film-type digital television receiver antenna is not complete complementary structure, the input impedance of actual measurement is more lower slightly compared with the complimentary antennas theoretical value of standard, greatly within the scope of 120 Ω-140 Ω, be mainly that nonideal feed condition causes during due to the finite length of actual antennas, limited thickness and test.And the characteristic impedance of camera cable is 75 Ω, therefore the impedance ratio of impedance transformer is designed to 1:2-1:3.Adjusting the result of surveying again after the impedance of impedance transformer is:
1, have wider directional diagram at the normal direction wave beam of antenna plane, field pattern is approximately cos θ, and under certain parameter, half-power width is approximately 90 °, as shown in Figure 3.
2, penetrated by limit until the interior radiation field of wide angular region of ± 70 ° is approximately circular polarization.
3, have wider impedance bandwidth, its directional diagram and impedance in quite wide frequency band range and frequency-independent, can realize LHF, VHF, UHF all-channel receives.
4, good in anti-interference performance, standing-wave ratio is below 2.5, as shown in Figure 4.
Above-mentioned result of implementation shows, the signal that this film-type digital television receiver antenna has been realized wideband digital TV receives.
Claims (3)
1. a film-type digital television receiver antenna, comprise thin film conductor, loop and medium substrate, it is characterized in that: described thin film conductor (1) is foil shape, it is attached to the upper formation of medium substrate (2) plate aerial by improved logarithm snail curve foil.
2. a kind of film-type digital television receiver antenna according to claim 1, is characterized in that: the spiral growth rate of described improved logarithm snail curve foil is 0.1.
3. a kind of film-type digital television receiver antenna according to claim 1, is characterized in that: described medium substrate (2) adopts glass-fiber-plate, paper or the plastic film of DIELECTRIC CONSTANT ε ≈ 2.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410103078.6A CN103872450A (en) | 2014-03-19 | 2014-03-19 | Thin-film digital television receiving antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410103078.6A CN103872450A (en) | 2014-03-19 | 2014-03-19 | Thin-film digital television receiving antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103872450A true CN103872450A (en) | 2014-06-18 |
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ID=50910733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410103078.6A Pending CN103872450A (en) | 2014-03-19 | 2014-03-19 | Thin-film digital television receiving antenna |
Country Status (1)
| Country | Link |
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| CN (1) | CN103872450A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482306A (en) * | 2017-07-06 | 2017-12-15 | 安徽省广播电视科研所 | Back feed type film-type DTV isotropic receiving antenna |
| CN108281776A (en) * | 2017-12-25 | 2018-07-13 | 广东曼克维通信科技有限公司 | UHF RFID card readers system and its card reader antenna |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1809948A (en) * | 2002-09-20 | 2006-07-26 | 美国快捷半导体有限公司 | RFID tag wide bandwidth logarithmic spiral antenna method and system |
| CN101394020A (en) * | 2008-11-13 | 2009-03-25 | 上海交通大学 | Ultra-wideband flat helical antenna having back chamber |
| CN103296397A (en) * | 2013-05-07 | 2013-09-11 | 广东电网公司电力科学研究院 | Balun-free low-profile single-arm Archimedean spiral antenna |
| CN203377376U (en) * | 2013-08-13 | 2014-01-01 | 武汉虹信通信技术有限责任公司 | A small-size broadband helical antenna |
| CN103594786A (en) * | 2013-10-30 | 2014-02-19 | 航天恒星科技有限公司 | Miniaturization spiral PIFA antenna with UHF band |
| CN203800170U (en) * | 2014-03-19 | 2014-08-27 | 安徽省广播电视科研所 | Film-type digital television reception antenna |
-
2014
- 2014-03-19 CN CN201410103078.6A patent/CN103872450A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1809948A (en) * | 2002-09-20 | 2006-07-26 | 美国快捷半导体有限公司 | RFID tag wide bandwidth logarithmic spiral antenna method and system |
| CN101394020A (en) * | 2008-11-13 | 2009-03-25 | 上海交通大学 | Ultra-wideband flat helical antenna having back chamber |
| CN103296397A (en) * | 2013-05-07 | 2013-09-11 | 广东电网公司电力科学研究院 | Balun-free low-profile single-arm Archimedean spiral antenna |
| CN203377376U (en) * | 2013-08-13 | 2014-01-01 | 武汉虹信通信技术有限责任公司 | A small-size broadband helical antenna |
| CN103594786A (en) * | 2013-10-30 | 2014-02-19 | 航天恒星科技有限公司 | Miniaturization spiral PIFA antenna with UHF band |
| CN203800170U (en) * | 2014-03-19 | 2014-08-27 | 安徽省广播电视科研所 | Film-type digital television reception antenna |
Non-Patent Citations (1)
| Title |
|---|
| 曹群生: "北斗卫星导航系统车载天线研究", 《万方数据企业知识服务平台学位论文》, 30 June 2011 (2011-06-30) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482306A (en) * | 2017-07-06 | 2017-12-15 | 安徽省广播电视科研所 | Back feed type film-type DTV isotropic receiving antenna |
| CN108281776A (en) * | 2017-12-25 | 2018-07-13 | 广东曼克维通信科技有限公司 | UHF RFID card readers system and its card reader antenna |
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Application publication date: 20140618 |
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| WD01 | Invention patent application deemed withdrawn after publication |