CN203300775U - Weak coupling cavity filter - Google Patents
Weak coupling cavity filter Download PDFInfo
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- CN203300775U CN203300775U CN2013203548057U CN201320354805U CN203300775U CN 203300775 U CN203300775 U CN 203300775U CN 2013203548057 U CN2013203548057 U CN 2013203548057U CN 201320354805 U CN201320354805 U CN 201320354805U CN 203300775 U CN203300775 U CN 203300775U
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Abstract
The utility model provides a weak coupling cavity filter, which relates to the field of electronic communication. The weak coupling cavity filter is to solve the problem that the coupling mode of the cavity filter in the prior art is only suitable for middle or broad band and not suitable for weak coupling. Five resonance circuits are arranged between a port I (1) and a port II (2) of the cavity filter, each resonance circuit comprises an inductor (L), a capacitor (C) and a inner resistor (R) which are in parallel connection, one end of each resonance circuit is connected between the port I (1) and the port II (2), the other end is connected to the ground, and a coupling weakening block is arranged on the line between two adjacent resonance circuits.
Description
Technical field
The utility model relates to electronic communication field, particularly a kind of weak coupling cavity body filter for mobile communication base station, repeater or trunk amplifier etc.
Background technology
Along with the development of mobile communication, for communication channel capacity, requiring is also day by day to increase severely, so in system equipment, needs to improve with the broadband filter of the Wideband Signal Processing the channel capacity of whole system.
Bandwidth (band width) be again frequency range, refers to the data quantity that can transmit in the fixing time, that is in transmission pipeline, can transmit the ability of data.In digital device, frequency range represents with bps usually, i.e. the figure place that can transmit of per second.In the communication radio frequency analog machine, frequency range usually with per second, transmits the cycle or hertz (Hz) represents.
From the band wide angle, can be divided into arrowband, middle band, the types such as broadband, wherein relative bandwidth is less than 20% the narrow band filter that belongs to, and the broadband filter that belongs to greater than 40% belongs to middle band filter between 20% and 40%.The relative bandwidth of narrow band filter: BW=(f2-f1)/f0.F1, f2 are respectively the start-stop frequencies of passband, and f0 is passband central frequency.
Also diversified filter on Vehicles Collected from Market, but the bandwidth requirement of general so conventional filter be all in, the filter in broadband, the filter of middle band is generally easily realized with cavity.Usually the filter of realizing arrowband is all to adopt to realize with the dielectric filter of high Q, but the volume of the filter of this class formation is large, and cost is higher, and more existing conventional narrow band filters mainly contain following characteristics:
1. dielectric filter, its main feature is that insertion loss is little, and squareness factor is good, and the volume of cavity is large,
With conventional method realize arrowband filter because coupling coefficient a little less than, the too narrow difficult production of the coupling window of cavity and debugging.
3. general cavity body filter weakens the way of coupling and is, the window size of regulating the both sides of coupling window changes the power of coupling, but the coupling of this class is applicable to middle band or broadband, if the too weak this method of coupling just can not realize.
Summary of the invention
The utility model is intended to solve the mode that existing cavity body filter weakens coupling and is only applicable to middle band or broadband, is not suitable for the technical problems such as coupling is too weak, to provide a kind of applicable to the very weak little weak coupling cavity body filter of operating state, volume of coupling.
The purpose of this utility model is achieved through the following technical solutions.
Weak coupling cavity body filter of the present utility model, between the port 1 of cavity body filter and port 22, be provided with 5 resonant circuits, the parallel circuits of each resonant circuit for being formed by inductance L, capacitor C and internal impedance R, one of each resonant circuit is terminated between port 1 and port 22, other end ground connection; Circuit between adjacent two resonant circuits is provided with one and weakens coupling block.
Weak coupling cavity body filter of the present utility model, wherein said cavity body filter are Chebyshev's cavity body filter or elliptic function cavity body filter.
The beneficial effect of the utility model weak coupling cavity body filter: relative bandwidth is narrow, and squareness factor is high, volume is little, and the layout of cavity can be determined according to the situation of index.
The accompanying drawing explanation
The circuit theory diagrams of Fig. 1 weak coupling cavity body filter of the present utility model
The conventional coupling principle front view of Fig. 2
Fig. 3 is the vertical view of Fig. 2
Fig. 4 weak coupling principle front view
Fig. 5 is the vertical view of Fig. 4
The number in the figure explanation:
1 port one, 2 ports two, 3 resonance points one, 4 resonance points two, 5 resonance points three, 6 resonance points four,
7 resonance points five, 8 coupling one, 9 coupling two, 10 coupling three, 11 coupling four, 12 coupling five, 13 couplings six
Embodiment
The utility model detailed construction, application principle, effect and effect, with reference to accompanying drawing 1-5, be explained by following execution mode.
Between the port 1 of cavity body filter and port 22, be provided with 5 resonant circuits, the parallel circuits of each resonant circuit for being formed by inductance L, capacitor C and internal impedance R, one of each resonant circuit is terminated between port 1 and port 22, other end ground connection; Circuit between adjacent two resonant circuits is provided with one and weakens coupling block.Described cavity body filter is Chebyshev's cavity body filter or elliptic function cavity body filter.
Referring to accompanying drawing 2-3, the coupling of general cavity body filter is all to carry out Energy Transfer by the Space Coupling between resonance 1 and resonance 2, be mainly by the adjusting coupling window window m size change the power of coupling, the coupling energy of this form is stronger;
Referring to accompanying drawing 4-5, weak coupling cavity body filter of the present utility model adopts cavity body structure to realize, coupling is the Space Coupling between resonance 1 and resonance 2, for the bottom between resonance 1 and resonance 2 of being coupling in of weakening between them adds and weakens coupling block (as Fig. 2), the height h that changes coupling block just can weaken coupling, the coupling of this structure can be very weak, and can realize with the elliptic function form of high squareness factor, the cavity volume of this weak coupling filter is little, and can carry out according to actual conditions the layout in arbitrary arrangement chamber.
Weak coupling cavity body filter of the present utility model mainly contains following index:
Band bandwidth: be namely the frequency range that need to meet the specification requirement of product standard electrical property.
Relative bandwidth: cut-off frequency f2 deducts the difference of cut-off frequency f1 divided by the centre frequency between them.
Insertion loss: the ratio of power output and input power is caused loss while weighing by filter.
Passband fluctuation: the degree that signal amplitude rises and falls in filter passband, poor between the value of signal fluctuation maximum in passband and minimum value.
Voltage standing wave ratio: the ratio that refers to incoming level power and output level power.It is mainly to weigh the signal important indicator whether matched well is transmitted in filter passband.
Out-of-band rejection: refer to the inhibition ability to the passband external signal, get the index of the pad value of the outer a certain frequency of passband as this.
Referring to accompanying drawing 1, be artificial circuit schematic diagram of the present utility model, this type of filter can adopt the filter of Chebyshev or elliptic function type.According to the requirement of actual index, can select, if require optional Chebyshev's type that inband flatness is high; Require the high elliptic function the selected type of Out-of-band rejection.
Weak coupling cavity body filter of the present utility model, the internal impedance R on inductance L, capacitor C and the left side in the middle of the circuit are connected in parallel and produce frequency F0, and the scope of its medium frequency just depends on inductance L and capacitor C, be worths larger frequency just lower, otherwise with regard to height.In-band insertion loss just depends on single chamber internal resistance R, and the Q value of single chamber internal resistance R is higher just shows that the insertion loss in passband is just little, otherwise bigger than normal.Shunt inductance L, capacitor C and internal resistance R are resonance points to the part on ground, in Fig. 1, have 5 parallel circuitss, i.e. 5 resonance points, two adjacent Frequency points transmit the increase bandwidth of operation by the capacitive coupling form, the coupling one of Fig. 1-coupling six totally 6 be coupled as the electric capacity normalized value.
Therefore weak coupling cavity body filter of the present utility model, have relative bandwidth narrow, and squareness factor is high, volume is little, and the layout of cavity can many technological merits such as determine according to the situation of index.
Claims (2)
1. weak coupling cavity body filter, it is characterized in that: between the port one (1) of cavity body filter and port two (2), be provided with 5 resonant circuits, each resonant circuit is the parallel circuits that consists of inductance (L), electric capacity (C) and internal impedance (R), one of each resonant circuit is terminated between port one (1) and port two (2), other end ground connection; Circuit between adjacent two resonant circuits is provided with one and weakens coupling block.
2. weak coupling cavity body filter according to claim 1, it is characterized in that: described cavity body filter is Chebyshev's cavity body filter or elliptic function cavity body filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203548057U CN203300775U (en) | 2013-06-20 | 2013-06-20 | Weak coupling cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203548057U CN203300775U (en) | 2013-06-20 | 2013-06-20 | Weak coupling cavity filter |
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| CN203300775U true CN203300775U (en) | 2013-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013203548057U Expired - Lifetime CN203300775U (en) | 2013-06-20 | 2013-06-20 | Weak coupling cavity filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107369868A (en) * | 2016-05-11 | 2017-11-21 | 广东特信超导技术有限公司 | GSM-R superconduction radio-frequency front-end high temperature superconduction wave filters |
| CN107369867A (en) * | 2016-05-11 | 2017-11-21 | 广东特信超导技术有限公司 | The high temperature superconduction wave filter of superconduction access system |
-
2013
- 2013-06-20 CN CN2013203548057U patent/CN203300775U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107369868A (en) * | 2016-05-11 | 2017-11-21 | 广东特信超导技术有限公司 | GSM-R superconduction radio-frequency front-end high temperature superconduction wave filters |
| CN107369867A (en) * | 2016-05-11 | 2017-11-21 | 广东特信超导技术有限公司 | The high temperature superconduction wave filter of superconduction access system |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131120 |
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| CX01 | Expiry of patent term |