CN85201903U - Coupling network for all-channel tv antenna - Google Patents
Coupling network for all-channel tv antenna Download PDFInfo
- Publication number
- CN85201903U CN85201903U CN198585201903U CN85201903U CN85201903U CN 85201903 U CN85201903 U CN 85201903U CN 198585201903 U CN198585201903 U CN 198585201903U CN 85201903 U CN85201903 U CN 85201903U CN 85201903 U CN85201903 U CN 85201903U
- Authority
- CN
- China
- Prior art keywords
- antenna
- pass filter
- channel
- coupling network
- described coupling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The utility model discloses a coupling network for all-channel TV antenna, which belongs to a TV receiving device. The coupling network is composed by a wide-band multi-port filter. The pass-band frequency and the stop-band frequency of the filter are designed into being consistent with the division of the television channels. Between the antenna and a feeder line, or the antenna and an active device is additionally connected with such a coupling network. The disadvantages of ghost of the image and the reduced gain caused by mismatching with the impedance are eliminated. The utility model makes each subsidiary antenna work in an optimum state interfering with each other. The effect of receiving TV is improved.
Description
The utility model is used for television receiving antenna device.
In the combination of existing full channel tv receiving antenna, work between several pairs of antennas and feeder line of different channel scope, and in the all-channel tv Active Receiving Antenna, between oscillator (or ring) antenna and the active device is direct-coupled, does not so often cause the decline of the reducing of visual ghost image, available power, pattern distortion and gain owing to impedance matches.For improving TV receiving effect, imagination adopts a coupling network of being made up of wide band multiport filter, add and be connected between antenna and feeder line or antenna and the active device, with the band connection frequency of filter with only become consistent with the division of television channel with Frequency Design, each input of network joins with the antenna of corresponding different channel respectively, its output port can join with feeder line or active network, also can be used as the TV signal that terminal provides all-channel.
The network of the utility model design in two kinds of situation.
When full channel tv receiving antenna is by working in VHF low channel (1～5 channel) respectively, the high channel of VHF (6～12 channel) and UHF(13～69 channels) Third Mate's combination of antennas when forming, coupling network is as shown in Figure 1.1-1 ' termination UHF channel TV antenna among the figure, the transmission line formula balance one uneven impedance transformer T that the UHF TV signal is formed via microstrip circuit
1With by C
1, C
2, L
1The T type high pass filter of forming is sent into 5-5 ' end, 2-2 ' termination VHF6～12 channel TV antennas, and 3-3 ' termination VHF1～5 channel TV antennas, the VHF TV signal of above-mentioned corresponding channel is respectively via C
4, C
5, C
6, C
7, L
4That form and by C
8, C
9, L
5, L
6, L
7, L
8Mix at 4-4 ' end behind the band pass filter of forming, again by a wide band balanced-unbalanced impedance transformer T
2, send into by C
3, L
2, L
3The T type low pass filter of forming mixes back output all-channel signal at 5-5 ' end then with the UHF TV signal, 5-5 ' termination 75 Ω unbalanced feeder lines perhaps connect 300 Ω balanced feeder lines through the unbalanced-balanced conversion device.
When full channel tv receiving antenna only is when being formed by two pairs of combination of antennas that work in VHF channel and UHF channel respectively, the circuit of coupling network as shown in Figure 2.6-6 ' termination VHF channel TV antenna among the figure, signal is sent into by C
10, L
9, L
10The π type low pass filter of forming, 1-1 ' termination UHF channel TV antenna, signal is sent into C
11, C
12, L
11The π type high pass filter of forming, VHF mixes with the UHF signal after broadband balanced-unbalanced impedance transformer T then
3Output, 5-5 ' termination 300 Ω balanced feeder lines perhaps connect 75 Ω unbalanced feeder lines through balanced-unbalanced transformer.
As a kind of conversion, if with two band pass filters in the accompanying drawing 1 and T
2Remove, change at 6-6 ' termination VHF channel TV antenna, then its effect is identical with the network of accompanying drawing 2, and difference only is to be output as balance output or uneven output.Can select the suitable network form according to the difference requirement and the composition full channel tv receiving antenna order of output.
Be an embodiment of the present utility model below, the circuit of employing is corresponding with accompanying drawing 1, is applicable to the situation that full channel tv receiving antenna is made up of Third Mate's antenna.
1-1 ' termination UHF channel TV antenna in the network, 2-2 ' termination VHF6～12 channel TV antennas, 3-3 ' termination VHF1～5 channel TV antennas, circuit element parameter is as follows:
C
1＝9.1P， C
2＝3P， C
3＝12.3P，
L
1＝0.02μH， L
2＝0.085μH， L
3＝0.026μH，
L
4＝0.09μH， L
5＝L
6＝0.315μH L
7＝L
3＝0.18μH，
C
4＝C
5＝C
6＝C
7＝10P， C
8＝3.9P， C
9＝10P
T
2Be broadband impedance transformer, adopt NX-1500 4 * 1.5 * 2 magnetic cores, with φ 0.25 enamelled wire two-wire and around 11/2 circle, centre cap forms.
The printed circuit diagram of this network such as accompanying drawing 3, ratio are 1:1, wherein C
1, C
2, L
1, L
2, L
3Be printingization electric capacity and inductance, T
1Adopt the microstrip circuit form.
The circuit that another embodiment of the present utility model adopts is corresponding with accompanying drawing 2, is applicable to the situation that full channel tv receiving antenna is made up of two pairs of antennas.
6-6 ' termination VHF channel TV antenna in the network, 1-1 ' termination UHF channel TV antenna, circuit element parameter is as follows:
L
9＝L
10＝0.118μH， C
10＝2.6μf，
L
11＝0.045μH， C
11＝C
12＝1.99pf
T
3Be broadband impedance transformer, with T
2Identical.
Accompanying drawing 4 is corresponding with it printed circuit diagrams, and ratio is 1:1, wherein L
11, C
11, C
12Be printingization inductance and electric capacity.
Between antenna and feeder line or active device as connecing a coupling network, solved impedance matching, be beneficial to and eliminate that image ghosting, available power reduce, the disadvantage of pattern distortion, improve the gain of active antenna, guarantee that each pair antenna without interfering with each other with optimum state work, has improved TV receiving effect.
Claims (5)
1, a kind of coupling network that is used for full channel tv receiving antenna, it is characterized in that comprising two band pass filters, a low pass filter and a high pass filter, the input of two band pass filters [2-2 ', 3-3 '] connect VHF high frequency antenna and VHF low-frequency antenna respectively, terminal through broadband balance one uneven impedance transformer T
2Link to each other with low pass filter top, the input of high pass filter [1-1 '] connects UHF channel antenna, and is connected to a balanced-unbalanced impedance transformer T who is made up of microstrip circuit
1, high pass filter and low pass filter have common output end [5-5 '].
2, by the described coupling network of claim 1, the wherein element (L in the low pass filter
2, L
3, C
3) and high pass filter in element (C
1, C
2, L
1) become the T type to connect respectively.
3, by the described coupling network of claim 2, the C in its printed circuit
1, C
2, L
1, L
2, L
3Be printingization electric capacity and inductance.
4, by the described coupling network of claim 1, the wherein element (L in the low pass filter
9, L
10, C
10) and high pass filter in element (L
11, C
11, C
12) become the π type to connect respectively.
5, by the described coupling network of claim 4, the L in its printed circuit
11, C
11, C
12Be printingization inductance and electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585201903U CN85201903U (en) | 1985-05-15 | 1985-05-15 | Coupling network for all-channel tv antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585201903U CN85201903U (en) | 1985-05-15 | 1985-05-15 | Coupling network for all-channel tv antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85201903U true CN85201903U (en) | 1986-03-12 |
Family
ID=4797841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN198585201903U Ceased CN85201903U (en) | 1985-05-15 | 1985-05-15 | Coupling network for all-channel tv antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85201903U (en) |
-
1985
- 1985-05-15 CN CN198585201903U patent/CN85201903U/en not_active Ceased
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |