CN202977670U - High-selectivity comb filter - Google Patents
High-selectivity comb filter Download PDFInfo
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- CN202977670U CN202977670U CN 201220622675 CN201220622675U CN202977670U CN 202977670 U CN202977670 U CN 202977670U CN 201220622675 CN201220622675 CN 201220622675 CN 201220622675 U CN201220622675 U CN 201220622675U CN 202977670 U CN202977670 U CN 202977670U
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Abstract
A high-selectivity comb filter disclosed by the utility model relates to the field of electronic communication and aims to solve the technical problems that conventional normal filters are relatively narrow in applicable bandwidth, limited in circuit form, and low in selectivity. In the high-selectivity comb filter disclosed by the utility model, a first resonator (1), a second resonator (2) and a third resonator (3) are arranged in a linear manner inside a filter cavity; an insulated medium (5) is arranged in the bottom of the cavity; a cross coupling line (4) is hung between the first resonator (1) and the third resonator (3); and the cross coupling line (4) is fixed on the insulated medium (5).
Description
Technical field
The utility model relates to electronic communication field, particularly a kind of high selectivity comb filter for mobile communication base station, repeater or trunk amplifier.
Background technology
Along with the development of mobile communication, higher for the requirement of the inhibition between multichannel in communication system, this just makes the filter that in system equipment, some high Inhibitory signal is processed, and improves the channel quality of whole system.In high-precision analytical instrument and multichannel data acquisition system, need to suppress and decay being with outer interference signal, require corresponding filter that higher frequency selectivity is arranged, namely be referred to as the sideband selectivity.The outer inhibition ability of the more all right oolemma of selectivity characteristic is just larger, and the filter of high selectivity is all generally elliptic function form commonly used, and this class filter has minimum passband and stopband fluctuation under the identical condition of exponent number.It is identical in the fluctuation of passband and stopband, and this point is different from passband and stopband smooth Butterworth filter all, and ripple or the Chebyshev filters of the ripples such as stopband is smooth, passband such as passband is smooth, stopband.
Highly selective filter is comparatively extensive in the filter the inside application of coaxial cavity class, and this class formation is mainly that the cavity rule is easy to arrange, and the place often can be used in design.
Existing conventional filter is all the form with Chebyshev, and the filter of high selectivity just is difficult to realize with conventional pectination cavity.Usually the filter of realizing high selectivity is all to adopt coaxial cavity to add cross-linked structure to realize, but the filter of this class formation is only suitable for for regular cavity.More existing conventional filters mainly contain following characteristics:
1. coaxial cavity height selective filter, its main feature is that insertion loss is little, and squareness factor is good, and the volume of cavity is moderate for general power, and the systematicness that cavity is arranged requires high, but this cavity is only suitable for for the filter of relative bandwidth than the arrowband;
2. pectination, interdigital filter, its main feature insertion loss is little, and volume is little, and this class filter is only suitable for for Chebyshev and selects less demanding filter.
Summary of the invention
The utility model is intended to solve the technical problems such as the applicable bandwidth relative narrower of existing conventional filter, circuit form limitation and alternative are low, a kind of applicable large bandwidth, selectivity are good to provide, insertion loss, volume are little, bear the large and strong high selectivity comb filter of antijamming capability of power.
The purpose of this utility model is achieved through the following technical solutions.
High selectivity comb filter of the present utility model, be arranged with resonance 1, resonance 22 and resonance 33 along straight line in filter cavity, cavity bottom is provided with dielectric 5, is hung with a cross-couplings line 4 between resonance 1 and resonance 33, and cross-couplings line 4 is fixed on dielectric 5.
High selectivity comb filter of the present utility model, wherein said resonance 1, resonance 22 and resonance 33 are made of one group of inductance L that is in parallel, capacitor C and single chamber internal resistance R respectively, one end ground connection of aforementioned parallel circuits, its other end are connected on circuit between filter input and output.
The beneficial effect of the utility model high selectivity comb filter: relative bandwidth is wide, insertion loss, volume are little, bear that power is large, antijamming capability is strong.
Description of drawings
Fig. 1 structure principle chart of the present utility model
Fig. 2 equivalent circuit theory figure of the present utility model
The number in the figure explanation:
1 resonance one, 2 resonance two, 3 resonance 34 cross-couplings lines, 5 dielectrics, the single chamber internal resistance of R, L inductance, C electric capacity, E coupling capacitance normalized value
Embodiment
The utility model detailed construction, application principle, effect and effect with reference to accompanying drawing 1-2, are explained by following execution mode.
Consult shown in Fig. 1-2, high selectivity comb filter of the present utility model, be arranged with resonance 1, resonance 22 and resonance 33 along straight line in filter cavity, cavity bottom is provided with dielectric 5, be hung with a cross-couplings line 4 between resonance 1 and resonance 33, cross-couplings line 4 is fixed on dielectric 5.
High selectivity comb filter of the present utility model adopts cavity body structure to realize, the cross-couplings of conventional coaxial cavity filter is the diagonal angle between resonance one and resonance three.High selectivity comb filter of the present utility model is being suspended in a cross-couplings line 4 between resonance 1 and resonance 33 utilizes the space to carry out the coupling energy transmission between them, the coupled modes of this form are applicable to the not conventional and cavity polymorphic structure class.The selectivity of filter requires higher, in the situation that satisfy insertion loss, the length of cross-couplings line is suitably increased, better inhibition degree is just arranged, this coupling line can equivalence be a capacitive coupling in circuit, namely suppress low side, in communication system, the filter that selectivity is good has also determined the antijamming capability of whole system, and therefore high selectivity comb filter of the present utility model can improve the performance of whole system.
Consult shown in Figure 2ly, be the equivalent circuit for simulating schematic diagram of this high selectivity comb filter of high selectivity comb filter of the present utility model, this type of filter can adopt the filter of Chebyshev or elliptic function type.Can select according to the requirement of actual index, if require the high optional Chebyshev's class of inband flatness to open; Relative bandwidth requires the high optional selection elliptic function type of Out-of-band rejection, even also can be selected this high elliptic function structure that suppresses at 〉=60% filter.The internal impedance R(left side in inductance L in circuit (centre) capacitor C and resonant cavity) be connected in parallel and produce frequency F0, the scope of its medium frequency just depends on inductance L and capacitor C, be worth larger frequency just lower, on the contrary height just.In-band insertion loss just depends on 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 single chamber internal resistance R are resonance points to the part on ground, then two adjacent Frequency points are transmitted the increase bandwidth of operation by the capacitive coupling form, and the coupling E above schematic diagram is the coupling capacitance normalized value.
High selectivity comb filter of the present utility model mainly contains following technical indicator:
-three dB bandwidth: corresponding frequency bandwidth when the fingerbreadth value equals two times of peaked two/radical signs.
Squareness factor: refer to the inhibition ability to the passband external signal, get the pad value of the outer a certain frequency of passband as this index; General commonly used be-the 60dB bandwidth ratio on-value of three dB bandwidth.
The center insertion loss: the ratio of power output and input power is caused loss when 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.
Therefore, high selectivity comb filter of the present utility model, have that relative bandwidth is wide, insertion loss, volume are little, bear many technological merits such as power is large, antijamming capability is strong, can be applicable on base station and repeater, suppress higher spuious, greatly increase work efficiency and improve traffic value amount.
Claims (2)
1. high selectivity comb filter, it is characterized in that: be arranged with resonance one (1), resonance two (2) and resonance three (3) along straight line in filter cavity, cavity bottom is provided with dielectric (5), be hung with a cross-couplings line (4) between resonance one (1) and resonance three (3), cross-couplings line (4) is fixed on dielectric (5).
2. high selectivity comb filter according to claim 1, it is characterized in that: described resonance one (1), resonance two (2) and resonance three (3) are made of with single chamber internal resistance (R) one group of inductance that is in parallel (L), electric capacity (C) respectively, one end ground connection of aforementioned parallel circuits, its other end are connected on circuit between filter input and output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220622675 CN202977670U (en) | 2012-11-22 | 2012-11-22 | High-selectivity comb filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220622675 CN202977670U (en) | 2012-11-22 | 2012-11-22 | High-selectivity comb filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202977670U true CN202977670U (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220622675 Expired - Fee Related CN202977670U (en) | 2012-11-22 | 2012-11-22 | High-selectivity comb filter |
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| CN (1) | CN202977670U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109037865A (en) * | 2018-09-28 | 2018-12-18 | 西南应用磁学研究所 | A kind of novel medium interdigital filter |
-
2012
- 2012-11-22 CN CN 201220622675 patent/CN202977670U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109037865A (en) * | 2018-09-28 | 2018-12-18 | 西南应用磁学研究所 | A kind of novel medium interdigital filter |
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| 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: 20130605 Termination date: 20181122 |
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| CF01 | Termination of patent right due to non-payment of annual fee |