CN102638238A - Capacity-coupling lumped-parameter double-frequency bandpass filter - Google Patents
Capacity-coupling lumped-parameter double-frequency bandpass filter Download PDFInfo
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- CN102638238A CN102638238A CN2012101138293A CN201210113829A CN102638238A CN 102638238 A CN102638238 A CN 102638238A CN 2012101138293 A CN2012101138293 A CN 2012101138293A CN 201210113829 A CN201210113829 A CN 201210113829A CN 102638238 A CN102638238 A CN 102638238A
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Abstract
The invention discloses a capacity-coupling lumped-parameter double-frequency-band filter which belongs to the field of double bandpass filters. The filter comprises n dual-mode resonators and n+1 capacitors, wherein n is a natural number, the n+1 capacitors are connected in series in sequence; one end of each dual-mode resonator is connected between each two adjacent capacitors; the other ends of the dual-mode resonators are connected with one another; the capacitors are used for realizing coupling between the dual-mode resonators; and each dual-mode resonator is formed by connecting two LC (inductance and capacitance)-parallel resonators in series. The capacity-coupling lumped-parameter double-frequency-band filter is small in volume and high in circuit efficiency, the bandwidth of two passbands can be set freely, transmission zero exists between the passbands, and the isolation degree of the passbands is high.
Description
Technical field
The present invention relates to a kind of filter, relate in particular to a kind of lumped parameter double frequency band-pass filter, belong to the double-passband filter field.
Background technology
The research of microwave and radio frequency comb filter mainly is in order to make up the multi-frequency multi-mode radio system, to make same radio-frequency front-end can support the work of a plurality of communication standards of different frequency.
Double-passband filter belongs to a kind of in the comb filter; It can be divided into two types of distributed circuit and lumped circuits on the way of realization; Distributed circuit has bigger volume when frequency is low, and the volume of lumped circuit is less relatively, is easy to integrated.
Double-passband filter can be divided into following two types again from technology path:
1, two band pass filter parallel connections.Use two band pass filters, each filter all is to be coupled to form by a plurality of resonators, through certain matching network two filters is together in parallel, and realizes two transmission passbands.This filter needs two cover resonators and two cover coupling networks, and circuit efficiency is low, and size is big.
2, dual-mode resonator can be realized double-passband filter through certain coupling network.The resonator that dual-mode resonator commonly used has step electric impedance resonator and loads minor matters.Two modes of resonance of dual-mode resonator are respectively applied for and realize a passband; This scheme circuit efficiency is high; But have bigger design difficulty, be mainly reflected in the bandwidth that two passbands can not be set respectively simultaneously, perhaps make coupling network very complicated for the bandwidth that designs two passbands.
Summary of the invention
The present invention is directed to the defective that prior art exists, and propose a kind of capacitance coupling type lumped parameter double frequency band-pass filter, reducing volume, and realize that two pass band widths freely are provided with.
This double frequency band-pass filter comprises n dual-mode resonator and n+1 electric capacity, and n is a natural number, and n+1 electric capacity is connected in series successively, connects an end of a dual-mode resonator between per two adjacent electric capacity respectively, and the other end of all dual-mode resonators interconnects.
Said dual-mode resonator is to be made up of two parallelly connected LC resonator series connection.
Technique effect:
1, adopt bimodulus lumped parameter resonator to realize double-passband filter, volume is little, and circuit efficiency is high, is particularly suitable for the application of UHF/VHF frequency range.
2, only use a cover coupling network, the circuit arrangement is relatively freer.
3, the frequency of two passbands and bandwidth can freely be provided with.
4, there is transmission zero between the passband, has higher isolation between passband.
Description of drawings
Fig. 1 is circuit topological structure figure of the present invention.
Fig. 2 is the circuit structure diagram of dual-mode resonator.
Fig. 3 is the circuit topological structure figure of capacitive coupling single-pass band filter.
Fig. 4 is a circuit simulation response curve of the present invention.
Embodiment
Be described further in the face of the present invention down.
Double frequency band-pass filter of the present invention comprises n dual-mode resonator and n+1 electric capacity; N is a natural number; N+1 electric capacity is connected in series successively, connects an end of a dual-mode resonator between per two adjacent electric capacity respectively, and the other end of all dual-mode resonators interconnects; Be to be coupled through electric capacity between the dual-mode resonator, and the dual-mode resonator nearest apart from input and output port also realized coupling through electric capacity respectively and between the input and output port.An exemplary circuit structure of the present invention is as shown in Figure 1, and it is by 3 dual-mode resonators and 4 capacitor C
01, C
12, C
23, C
34Constitute.The electric capacity that relates in this filter can adopt patch capacitor, perhaps the electric capacity of other any encapsulation, any physical form.
The circuit structure of dual-mode resonator is as shown in Figure 2, and it is by C
1With L
1Parallel connection and C
2With L
2Two resonators (parallelly connected LC resonator) series connection that parallel connection constitutes constitutes, and the inductance in the resonator can adopt chip inductor, air windings inductance, perhaps the inductance of other any encapsulation, any physical form.Two parallelly connected LC resonators are distinguished resonance in different frequencies, the resonance frequency omega of two resonators
iWith susceptance slope b
iBe respectively:
Suppose C
1With L
1Parallel connection constitutes resonator 1, C
2With L
2Parallel connection constitutes resonator 2.At ω
1Near, the susceptance of resonator 1 approaches zero, and the susceptance of resonator 2 is relatively very big, so the circuit of resonator 2 can be ignored, whole dual-mode resonator Approximate Equivalent becomes resonator 1; In like manner, at ω
2Near, whole dual-mode resonator Approximate Equivalent becomes resonator 2.Because dual-mode resonator is merely a parallelly connected LC resonator at the equivalent electric circuit of different frequency bands; Therefore near any band connection frequency; Double frequency band-pass filter of the present invention is equivalent to a capacity coupled single-pass band filter, and filter construction promptly shown in Figure 1 is equivalent to filter construction shown in Figure 3.
After capacitance on coupling channel was confirmed, electric capacity was relevant with bandwidth with the size and the passband communication frequency of inductance value in each resonator, therefore can realize the setting to band connection frequency and bandwidth through the setting to electric capacity and inductance value in each resonator.
Provide the design example of one three rank double-passband filter of the present invention (Fig. 1) below, the centre frequency of two passbands is respectively f
01=200MHz and f
02=520MHz, bandwidth is respectively 10MHz and 40MHz, and each component value is as shown in table 1.
Table 1
| The element title | Component value | The element title | Component value |
| C 01 | 5pF | C s31 | 12.44pF |
| C 12 | 1pF | L s31 | 35.2nH |
| C 23 | 1pF | C s12 | 15pF |
| C 34 | 5pF | L s12 | 5.3nH |
| C s11 | 12.44pF | C s22 | 2.99pF |
| L s11 | 35.2nH | L s22 | 20.29nH |
| C s21 | 11.57pF | C s32 | 15pF |
| L s21 | 46.66nH | L s32 | 46.66nH |
The circuit simulation curve of instance of the present invention is as shown in Figure 4, and visible, the bandwidth of two passbands of this filter meets the demands, and has transmission zero between the passband, and isolation is higher.
Claims (2)
1. capacitive coupling lumped parameter double frequency band-pass filter; It is characterized in that: comprise n dual-mode resonator and n+1 electric capacity; N is a natural number; N+1 electric capacity is connected in series successively, connects an end of a dual-mode resonator between per two adjacent electric capacity respectively, and the other end of all dual-mode resonators interconnects.
2. capacitive coupling lumped parameter double frequency band-pass filter according to claim 1 is characterized in that: said dual-mode resonator is to be made up of two parallelly connected LC resonator series connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101138293A CN102638238A (en) | 2012-04-17 | 2012-04-17 | Capacity-coupling lumped-parameter double-frequency bandpass filter |
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| CN2012101138293A CN102638238A (en) | 2012-04-17 | 2012-04-17 | Capacity-coupling lumped-parameter double-frequency bandpass filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410381A (en) * | 2014-10-22 | 2015-03-11 | 江苏科技大学 | Lumped parameter dual-frequency impedance matching network |
| CN111817685A (en) * | 2020-07-31 | 2020-10-23 | 曾运华 | Electrically tunable microwave active filter |
| RU2793609C1 (en) * | 2022-11-18 | 2023-04-04 | Акционерное общество "Научно-производственное предприятие "Салют" | 2-band lc filter |
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|---|---|---|---|---|
| US5963113A (en) * | 1997-04-23 | 1999-10-05 | Oki Electric Industry Co., Ltd. | Saw ladder filter with inter-stage matching saw resonator |
| CN1288289A (en) * | 1999-09-10 | 2001-03-21 | 株式会社村田制作所 | Monolithic inductive capacity reconance and monolithic inductive capacity filter |
| US20030060170A1 (en) * | 2001-09-26 | 2003-03-27 | Nokia Corporation | Dual-channel passband filtering system using acoustic resonators in lattice topology |
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| CN101834326A (en) * | 2010-04-23 | 2010-09-15 | 南京信息工程大学 | Dual passband filter with left-handed performance |
| CN102403562A (en) * | 2011-11-02 | 2012-04-04 | 华南理工大学 | Powder divider integrating a dual-frequency bandpass filter |
-
2012
- 2012-04-17 CN CN2012101138293A patent/CN102638238A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5963113A (en) * | 1997-04-23 | 1999-10-05 | Oki Electric Industry Co., Ltd. | Saw ladder filter with inter-stage matching saw resonator |
| CN1288289A (en) * | 1999-09-10 | 2001-03-21 | 株式会社村田制作所 | Monolithic inductive capacity reconance and monolithic inductive capacity filter |
| US20030060170A1 (en) * | 2001-09-26 | 2003-03-27 | Nokia Corporation | Dual-channel passband filtering system using acoustic resonators in lattice topology |
| CN200986959Y (en) * | 2006-08-14 | 2007-12-05 | 海泰超导通讯科技（天津）有限公司 | Microstrip filter with trap filter |
| CN101834326A (en) * | 2010-04-23 | 2010-09-15 | 南京信息工程大学 | Dual passband filter with left-handed performance |
| CN102403562A (en) * | 2011-11-02 | 2012-04-04 | 华南理工大学 | Powder divider integrating a dual-frequency bandpass filter |
Non-Patent Citations (2)
| Title |
|---|
| 官雪辉: "无线通信微波双频带通滤波器研究", 《万方学位论文》, 19 November 2007 (2007-11-19), pages 80 - 91 * |
| 段晓燕: "无线通信中的微带双频滤波器的研究", 《万方学位论文》, 29 October 2010 (2010-10-29), pages 35 - 46 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410381A (en) * | 2014-10-22 | 2015-03-11 | 江苏科技大学 | Lumped parameter dual-frequency impedance matching network |
| CN104410381B (en) * | 2014-10-22 | 2018-04-13 | 江苏科技大学 | Lumped parameter double frequency impedance matching network |
| CN111817685A (en) * | 2020-07-31 | 2020-10-23 | 曾运华 | Electrically tunable microwave active filter |
| RU2793609C1 (en) * | 2022-11-18 | 2023-04-04 | Акционерное общество "Научно-производственное предприятие "Салют" | 2-band lc filter |
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Application publication date: 20120815 |