CN200987146Y - Duplex filter and printed circuit boards having the same - Google Patents
Duplex filter and printed circuit boards having the same Download PDFInfo
- Publication number
- CN200987146Y CN200987146Y CN 200620173197 CN200620173197U CN200987146Y CN 200987146 Y CN200987146 Y CN 200987146Y CN 200620173197 CN200620173197 CN 200620173197 CN 200620173197 U CN200620173197 U CN 200620173197U CN 200987146 Y CN200987146 Y CN 200987146Y
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- electric capacity
- inductance
- pass filter
- circuit
- filter circuit
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Abstract
The utility model discloses a duplex filter, including a F head, a high-frequency tuner downlink signal input terminal, a user uplink signal output terminal, a low-pass filter circuit and a high-pass filter circuit. The low-pass filter circuit is connected with the user uplink signal output terminal, the high-pass filter circuit is connected with the high frequency tuner downlink signal input terminal, and the high-pass filter circuit and the low-pass filter circuit are connected with the F head in parallel. The utility model also provides a printed circuit board with the duplex filter. Compared with the existing technology, the utility model adopts the design of patch inductance capacitor, overcoming the shortcoming that the existing technology has high cost, large volume and incompact structure, and the debugging of index, such as the reflection and transmission loss, is difficult and has no ideal effect.
Description
Technical field
The utility model relates to electronic circuit field, especially relates to a kind of duplexer filter and the printed circuit board (PCB) with this duplexer filter.
Background technology
Duplexer filter is mainly used between wire cable and cable modem (Cable Modem) radiofrequency signal is carried out bidirectional filtering.Duplexer filter is widely used in the products such as cable modem, set-top box and gateway at present, along with cable broadband data service fast development, utilize hardware resources such as original cable broadband cable, finish functions such as online by cable modem, being not only feasiblely concerning wired operator and user, and is necessary.And to finish this function, must between wire cable and cable modem, utilize duplexer filter to carry out the filtering of uplink and downlink signals.
The utility model content
The purpose of this utility model is to have proposed a kind of duplexer filter, and it can realize the filter action to input/output signal, thereby guarantees the quality of input/output signal.
Another purpose of the present utility model is to provide the printed circuit board (PCB) with above-mentioned duplexer filter.
In order to achieve the above object, the utility model is achieved by the following technical solutions:
Duplexer filter of the present utility model comprises a F head, a tuner downstream signal output, a user uplink signal input part, a low-pass filter circuit and a circuit of high pass filter, described low-pass filter circuit links to each other with described user uplink signal input part, described circuit of high pass filter links to each other with described tuner downstream signal output, and described circuit of high pass filter and low-pass filter circuit are connected to the F head.
Printed circuit board (PCB) of the present utility model comprises duplexer filter, and the inductance in this duplexer filter, electric capacity are the paster device.
Compared with prior art, duplexer filter of the present utility model can be realized the filter action to input/output signal, thereby guarantees the quality of input/output signal.In addition, the duplexer filter of printed circuit board (PCB) of the present utility model adopts chip inductor capacitor element design, has overcome prior art cost height, and volume is big, the not compact and crucial radio-frequency (RF) index debug difficulties such as reflection and loss of product structure, dissatisfactory defective.
Description of drawings
Fig. 1 is the circuit structure diagram of the bidirectional filter that provides of the utility model.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are further described in detail with reference to accompanying drawing.
Embodiment
See also Fig. 1, duplexer filter of the present utility model is by a F head, one is used for that upward signal (5-65MHZ) is carried out the circuit of high pass filter that the low-pass filter circuit of filtering and is used for downstream signal (110-860MHZ) is carried out filtering and realizes its purpose, and described circuit of high pass filter and low-pass filter circuit are connected to the F head.Downstream signal in the Wireline through F head and described circuit of high pass filter, enters tuner downstream signal output RF_DOWN; And the upward signal that the user sends is blended into the wire signal circuit from the F head through described low-pass filter circuit from user uplink signal input part RF_UP input.
Described circuit of high pass filter comprises seven capacitor C 77, C74, C75, C76, C69, C71, C73 and three inductance L 18, L25, L26.Capacitor C 77, capacitor C 74, capacitor C 75, capacitor C 76 are connected in series between F head and the tuner downstream signal output RF_DOWN, described capacitor C 77 other ends link to each other with the F head, and described capacitor C 76 other ends link to each other with tuner downstream signal output RF_DOWN; Described inductance L 18 1 ends are connected between capacitor C 77 and the capacitor C 74, and the other end links to each other with reference ground through capacitor C 69; Described inductance L 25 1 ends are connected between capacitor C 74 and the capacitor C 75, and the other end links to each other with reference ground through capacitor C 71; Described inductance L 26 1 ends are connected between capacitor C 75 and the capacitor C 76, and the other end links to each other with reference ground through capacitor C 73.
Described low-pass filter circuit comprises seven capacitor C 80, C79, C78, C83, C82, C131, C209 and three inductance L 28, L29, L30 at least, parallel circuits one end of described inductance L 28 and capacitor C 80 links to each other with the F head, the other end links to each other with the parallel circuits of inductance L 30 with capacitor C 78 through the parallel circuits of inductance L 29 and capacitor C 79, and the parallel circuits other end of described inductance L 30 and capacitor C 78 links to each other with user uplink signal input part RF_UP through capacitor C 209.
Described low-pass filter circuit also comprises a ∏ type filter circuit, it is the LC filter circuit, comprise two capacitor C 61, C1 inductance L 1, inductance L 1 one ends link to each other with capacitor C 209, the other end is connected with user uplink signal input part RF_UP through a capacitor C 59, inductance L 1 one ends are through capacitor C 61 ground connection, and the other end is through capacitor C 1 ground connection.
Described low-pass filter circuit also comprises two capacitor C 81, C208 and the LC filter circuit that inductance L 27 is formed, inductance L 27 and capacitor C 81 are serially connected with between the parallel circuits of F head and inductance L 28 and capacitor C 80, capacitor C 208 1 is terminated between capacitor C 81 and the described parallel circuits, other end ground connection.
Printed circuit board (PCB) of the present utility model comprises above-mentioned duplexer filter, and the inductance in this duplexer filter, electric capacity adopt the mode of paster to be installed on printed circuit board (PCB).
The utility model has solved existing bidirectional filter building block technique cost height by adopting above-mentioned simple paster circuit structure, and is loosely organized, the shortcoming that crucial radio-frequency (RF) index such as reflection and loss can not be adjusted arbitrarily as required.
Claims (8)
1, a kind of duplexer filter, it is characterized in that, it comprises a F head, a tuner downstream signal input, a user uplink signal output part, a low-pass filter circuit and a circuit of high pass filter, described low-pass filter circuit links to each other with described user uplink signal output part, described circuit of high pass filter links to each other with described tuner downstream signal input, and described circuit of high pass filter and low-pass filter circuit are connected to the F head.
2, a kind of duplexer filter as claimed in claim 1, it is characterized in that, described circuit of high pass filter comprises seven electric capacity (C77, C74, C75, C76, C69, C71, C73) and three inductance (L18, L25, L26), described electric capacity (C77), electric capacity (C74), electric capacity (C75), electric capacity (C76) are connected in series between described F head and the tuner downstream signal input, described electric capacity (C77) other end links to each other with the F head, and described electric capacity (C76) other end links to each other with tuner downstream signal input; Described inductance (L18) end is connected between electric capacity (C77) and the electric capacity (C74), and an end links to each other with reference ground through electric capacity (C69); Described inductance (L25) end is connected between electric capacity (C74) and the electric capacity (C75), and an end links to each other with reference ground through electric capacity (C71); Described inductance (L26) end is connected between electric capacity (C75) and the electric capacity (C76), and an end links to each other with reference ground through electric capacity (C73).
3, a kind of duplexer filter as claimed in claim 1, it is characterized in that, described low-pass filter circuit comprises seven electric capacity (C80, C79, C78, C83, C82, C131, C209) and three inductance (L28, L29, L30), parallel circuits one end of described inductance (L28) and electric capacity (C80) links to each other with the F head, the other end links to each other with the parallel circuits of inductance (L30) with electric capacity (C78) through the parallel circuits of inductance (L29) and electric capacity (C79), and the parallel circuits other end of described inductance (L30) and electric capacity (C78) links to each other with the user uplink signal output part through electric capacity (C209).
4, as claimed in claim 3 one sharp duplexer filter is characterized in that, described low-pass filter circuit also comprises a ∏ type filter circuit, and it is connected between described electric capacity (C209) and the user uplink signal output part.
5, a kind of duplexer filter as claimed in claim 4, it is characterized in that, described ∏ type filter circuit is the LC filter circuit, it comprises two electric capacity (C61, C1) inductance (L1), described inductance (L1) is serially connected with between described electric capacity (C209) and the user uplink signal output part, described inductance (L1) end is through electric capacity (C61) ground connection, and the other end is through electric capacity (C1) ground connection.
6, a kind of duplexer filter as claimed in claim 5 is characterized in that, it also comprises an electric capacity (C59), and it is serially connected with between ∏ type filter circuit and the user uplink signal output part.
7, as one of any described a kind of duplexer filter of claim 3 to 6, it is characterized in that, it also comprises two electric capacity (C81, C208) and an inductance (L27), described inductance (L27) and electric capacity (C81) are serially connected with between the parallel circuits of F head and inductance (L28) and electric capacity (C80), described electric capacity (C208) one is terminated between electric capacity (C81) and the described parallel circuits, an end ground connection.
8, a kind of printed circuit board (PCB) is characterized in that: it comprises one of any described duplexer filter of claim 2 to 7, and the inductance in this duplexer filter, electric capacity are the paster device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620173197 CN200987146Y (en) | 2006-12-25 | 2006-12-25 | Duplex filter and printed circuit boards having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620173197 CN200987146Y (en) | 2006-12-25 | 2006-12-25 | Duplex filter and printed circuit boards having the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200987146Y true CN200987146Y (en) | 2007-12-05 |
Family
ID=38916599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620173197 Expired - Fee Related CN200987146Y (en) | 2006-12-25 | 2006-12-25 | Duplex filter and printed circuit boards having the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200987146Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101677232B (en) * | 2008-09-17 | 2012-05-23 | 启碁科技股份有限公司 | Band elimination filter capable of eliminating harmonic waves and related satellite signal receiver thereof |
| CN102487268A (en) * | 2010-12-03 | 2012-06-06 | 约翰·梅扎林瓜联合有限公司 | Filter circuit |
| CN106533381A (en) * | 2016-12-31 | 2017-03-22 | 马鞍山格尚智能装备有限公司 | Amplifier circuit based on improving volume information transmission |
| CN107710502A (en) * | 2015-07-14 | 2018-02-16 | 株式会社村田制作所 | Directional coupler |
-
2006
- 2006-12-25 CN CN 200620173197 patent/CN200987146Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101677232B (en) * | 2008-09-17 | 2012-05-23 | 启碁科技股份有限公司 | Band elimination filter capable of eliminating harmonic waves and related satellite signal receiver thereof |
| CN102487268A (en) * | 2010-12-03 | 2012-06-06 | 约翰·梅扎林瓜联合有限公司 | Filter circuit |
| CN107710502A (en) * | 2015-07-14 | 2018-02-16 | 株式会社村田制作所 | Directional coupler |
| CN107710502B (en) * | 2015-07-14 | 2020-08-28 | 株式会社村田制作所 | Directional coupler |
| CN106533381A (en) * | 2016-12-31 | 2017-03-22 | 马鞍山格尚智能装备有限公司 | Amplifier circuit based on improving volume information transmission |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071205 Termination date: 20141225 |
|
| EXPY | Termination of patent right or utility model |