CN213906638U - Novel reflection-free filter - Google Patents
Novel reflection-free filter Download PDFInfo
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- CN213906638U CN213906638U CN202120000743.4U CN202120000743U CN213906638U CN 213906638 U CN213906638 U CN 213906638U CN 202120000743 U CN202120000743 U CN 202120000743U CN 213906638 U CN213906638 U CN 213906638U
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Abstract
The utility model discloses a novel no reflection wave filter, this circuit structure are by inductance L1, L2, L3 and L4, four adjustable electric capacity C1, C2, C3 and C4, and two resistance R1, R2 realize. The utility model discloses can the wide use in WCDMA mobile communication system, radar antenna and RFID transceiver etc. to the place that signal performance required the strictness. A reflection-free filtering function can be achieved where the stopband portion of the spectrum is absorbed rather than reflected back to the source. Simultaneously, compare the filter circuit of other structures, the utility model discloses can realize that no reflection filter is adjustable to can apply to the different frequency channels of communication system in.
Description
Technical Field
The utility model relates to a no reflection filter, especially a novel no reflection filter belongs to communication and electron application, has important application in radio frequency circuit very much.
Background
In recent years, a series of researches on filter circuits have been conducted at home and abroad. A plurality of research results are obtained, and particularly, when the filter circuit is applied to the mobile communication technology and is used at the front end of a power amplifier and a radar antenna feed part, the problem of high noise outside a system passband can be effectively solved by the filter circuit. However, the design structure of the system can only be used in a specific frequency band, and the bandwidth is small, so that the system is large in size and not strong in universality. Meanwhile, the traditional coupling filter circuit has extremely strong temperature sensitivity and very limited applicability due to the problem of the circuit structure. The utility model discloses to above problem, can realize that the stop band part of frequency spectrum is absorbed and not got back to the no reflection filtering function of source by the reflection to stability is high, small, compact structure, processing are simple, and application scope is extensive.
Disclosure of Invention
The utility model provides a have adjustable, simple structure, small, the high no reflection wave filter of stability.
Realize the utility model discloses the technical scheme of purpose is: a novel non-reflection filter comprises an input Port1 (Port 1), an output Port2 (Port 2), inductors L1, L2, L3 and L4, four adjustable capacitors C1, C2, C3 and C4, and two resistors R1 and R2. Wherein, the input Port (Port 1) is connected with the node 1; an output Port (Port 2) is connected to node 3; one end of the inductor L3 is connected to the node 1, and the other end is connected to the node 2; one end of the inductor L4 is connected to node 2, and the other end is connected to node 3; one end of the capacitor C1 is connected to the node 1, and the other end is connected to the node 4; one end of the capacitor C2 is connected to the node 3, and the other end is connected to the node 5; one end of the inductor L1 is connected to the node 4, and the other end is connected to ground; one end of the inductor L2 is connected to the node 5, and the other end is connected to ground; one end of the resistor R1 is connected to the node 4, and the other end is connected to the node 6; one end of the resistor R2 is connected to the node 5, and the other end is connected to the node 7; one end of the capacitor C3 is connected to node 6, and the other end is connected to ground; one end of the capacitor C4 is connected to the node 7, and the other end is connected to ground; input Port1 (Port 1) and output Port2 (Port 2) are both connected to 50 ohm impedance.
Compared with the prior art, the utility model provides a simple structure, multifrequency section, compact structure, characteristics that stability is high. A reflection-free filtering function can be achieved where the stopband portion of the spectrum is absorbed rather than reflected back to the source.
Drawings
Fig. 1 is the utility model discloses a novel no reflection wave filter.
Fig. 2 is the utility model discloses a novel no reflection filter S parameter response.
Fig. 3 is a phase response of the novel reflectionless filter of the present invention.
Fig. 4 is a diagram of the group delay characteristic response of a novel reflectionless filter of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
With reference to fig. 1, the present invention is a novel reflectionless filter, which includes an input Port1 (Port 1), an output Port2 (Port 2), an inductor L1, an L2, an L3, and an L4, four adjustable capacitors C1, C2, C3, and C4, and two resistors R1 and R2. Wherein, the input Port (Port 1) is connected with the node 1; an output Port (Port 2) is connected to node 3; one end of the inductor L3 is connected to the node 1, and the other end is connected to the node 2; one end of the inductor L4 is connected to node 2, and the other end is connected to node 3; one end of the capacitor C1 is connected to the node 1, and the other end is connected to the node 4; one end of the capacitor C2 is connected to the node 3, and the other end is connected to the node 5; one end of the inductor L1 is connected to the node 4, and the other end is connected to ground; one end of the inductor L2 is connected to the node 5, and the other end is connected to ground; one end of the resistor R1 is connected to the node 4, and the other end is connected to the node 6; one end of the resistor R2 is connected to the node 5, and the other end is connected to the node 7; one end of the capacitor C3 is connected to node 6, and the other end is connected to ground; one end of the capacitor C4 is connected to the node 7, and the other end is connected to ground; input Port1 (Port 1) and output Port2 (Port 2) are both connected to 50 ohm impedance.
When the circuit parameters are fixed, the non-reflection filter can obtain the S parameter response as shown in fig. 2, and the phase characteristic curve response as shown in fig. 3, and as can be seen from fig. 2 and 3, the non-reflection filter function that the stop band part of the frequency spectrum is absorbed but not reflected back to the source can be realized, and the non-reflection filter has the linear phase. The group delay characteristic is shown in fig. 4, and can be delayed by 4.4ns in the band, and the non-reflection filter can be integrated with the RFID reader transceiver on one chip.
The novel reflection-free filter can be applied to an RFID reader transceiver, and the use result shows that the device has a good suppression degree on the pulse and noise level of a channel receiver, effectively realizes the transmission and isolation of signals, can realize the reflection-free filtering function that the stop band part of the frequency spectrum is absorbed but not reflected back to the source, and can ensure that the device obtains the best channel signal transmission and isolation effect.
Claims (1)
1. A novel reflection-free filter is characterized in that: the circuit comprises an input port1, an output port2, inductors L1, L2, L3 and L4, four adjustable capacitors C1, C2, C3 and C4, and two resistors R1 and R2; wherein, the input port1 is connected with the node 1; the output port2 is connected with the node 3; one end of the inductor L3 is connected to the node 1, and the other end is connected to the node 2; one end of the inductor L4 is connected to node 2, and the other end is connected to node 3; one end of the capacitor C1 is connected to the node 1, and the other end is connected to the node 4; one end of the capacitor C2 is connected to the node 3, and the other end is connected to the node 5; one end of the inductor L1 is connected to the node 4, and the other end is connected to ground; one end of the inductor L2 is connected to the node 5, and the other end is connected to ground; one end of the resistor R1 is connected to the node 4, and the other end is connected to the node 6; one end of the resistor R2 is connected to the node 5, and the other end is connected to the node 7; one end of the capacitor C3 is connected to node 6, and the other end is connected to ground; one end of the capacitor C4 is connected to the node 7, and the other end is connected to ground; input port1 and output port2 are both connected to 50 ohm impedance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120000743.4U CN213906638U (en) | 2021-01-03 | 2021-01-03 | Novel reflection-free filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120000743.4U CN213906638U (en) | 2021-01-03 | 2021-01-03 | Novel reflection-free filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213906638U true CN213906638U (en) | 2021-08-06 |
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ID=77107344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120000743.4U Expired - Fee Related CN213906638U (en) | 2021-01-03 | 2021-01-03 | Novel reflection-free filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213906638U (en) |
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2021
- 2021-01-03 CN CN202120000743.4U patent/CN213906638U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210806 Termination date: 20220103 |
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| CF01 | Termination of patent right due to non-payment of annual fee |