CN208315717U - Using the small sized double frequency bandpass filter of minor matters load bending type defected microstrip structure - Google Patents
Using the small sized double frequency bandpass filter of minor matters load bending type defected microstrip structure Download PDFInfo
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- CN208315717U CN208315717U CN201820990810.XU CN201820990810U CN208315717U CN 208315717 U CN208315717 U CN 208315717U CN 201820990810 U CN201820990810 U CN 201820990810U CN 208315717 U CN208315717 U CN 208315717U
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- resonator
- minor matters
- open circuit
- microstrip structure
- bending type
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Abstract
The utility model discloses a kind of small sized double frequency bandpass filters using minor matters load bending type defected microstrip structure, mainly being coupled to form using the first resonator and the second resonator of open circuit minor matters load bending type defected microstrip structure by a pair of of center symmetric setting, each resonator respectively includes one section of L-shaped open circuit minor matters and a part of defected microstrip structure.It is equipped with a pair of of central symmetry on the outside of the resonator and has the incoming feeder and output feeder of impedance matching structure, respectively the microstrip line input terminal by respective 50 ohm and output end direct feed.The utility model contains two passband central frequency controls, further comprises the control of bandwidth, can satisfy the design requirement of small sized double frequency system, can be applied in the microwave electrons system such as mobile communication, radar, remote sensing.
Description
Technical field
The utility model relates to microwave technical fields more particularly to a kind of use minor matters to load bending type defected microstrip structure
Small sized double frequency bandpass filter.
Background technique
Microwave filter is one of very important device in current frequency microwave integrated circuit, and filter is many microwaves
Critical component in millimeter-wave systems, between it can effective filter out various garbage signals and noise signal, reduce each communication channel
Interference realize the communication of high quality to ensure the normal work of communication system.In recent years, with wireless communication technique, lead
The development of boat technology and electronic countermeasure, the frequency range occupied between system is more and more closer, and simultaneous communications device is done smaller and smaller,
In each receiver have the components such as its independent antenna, filter, low-noise amplifier.If system will work at the same time
f1And f2Frequency range, conventionally, then system must include the receiver of two one-segments, and with this method not only
Cause circuit area big, and power consumption is also big.According to dual-band antenna, double frequency band-pass with single port input single port output
The dual-frequency receiver of the compositions such as filter, dual-frequency amplifier.Due to the application of multifrequency front-end devices, the volume of system can be saved
Half or so, since many devices share or reuse, system power dissipation reduces than multiple single-frequency transceivers, corresponding equipment at
This is then substantially reduced.And Primary Component of the double frequency band-pass filter as these communication front-ends, it receives much attention naturally.
According to investigations with understanding, it has been disclosed that the double frequency band-pass filter prior art it is as follows:
First method: higher-frequency passband is realized using the higher mode of SIR.SIR (step impedance resonator) is exactly by two
Transverse electric and magnetic field made of a or more than two transmission line combinations with different characteristic impedance or quasi- transverse-electromagnetic field mode
Resonator.The main advantage of this resonator is exactly to have very big freedom degree in structure and design.The principle of this method
It is that can generate controllable resonant frequency using SIR, the fundamental frequency of SIR resonator is arranged to lower in double frequency required for us
Frequently, the secondary mould resonance frequency of SIR resonator is arranged to the higher-frequency in double frequency required for us, to realize double frequency
Band.
Sheng Sun and Lei Zhu in 2005 et al. proposes the double frequency band-pass filter realized in aforementioned manners, entitled
" Compact dual-band microstrip bandpass filter without external feeds ", the filtering
Device works in 2.4GHz and 5.2GHz.Outside is 50 Ω input and output feeder lines, and inside is a pair of two/wavelength SIR, for
SIR adjusts K0, control SIR impedance ratio.The length for adjusting SIR simultaneously, so that f0=2.4GHz.To realize double frequency band-pass spy
Property.
Second method: double frequency band-pass filter is designed using degenerate mode, is generally used on toroidal cavity resonator, annular is humorous
The degeneracy bimodulus of vibration device is typically all parity mode, general two kinds of realizations double-mode double-band method: 1, bicyclic, Mei Gehuan of different sizes
Control a frequency, perturbation control bandwidth.2, two the same mirror images are bicyclic, by perturbation size, control double frequency frequency
Than independently controlling the coupling of two modes by placement position.
Sen Fu and Bian Wu in 2012 et al. proposes that a kind of 2 rank of dual mode/dual band using capacitive load Q-RING is filtered
Wave device, entitled " Novel second order dual-mode dual-band filters using capacitance
loaded square loop resonator".When the capacitive perturbation of load changes, odd mould mode frequency is basically unchanged, and
Even mould mode frequency changes very big.Therefore can independent control frequency can in addition, by adjusting the placement position of two mirror image rings
With the coupling of independent control two odd moulds and two even moulds, it is finally introducing source load coupling and increases transmission zero to improve stopband spy
Property.
The third method: utilizing minor matters designing load double frequency band-pass filter, and detail loads resonator structure in last century
Just there is scholar's proposition the end of the nineties, load minor matters method is initially developed from single half-wave resonator, by opening in half-wavelength
Ring resonator center loaded shorting stub introduces parity mode concept, so that non-coupled multi-mode feature is generated, it is special using this multimode
Property realize dual frequency characteristics.
Zhang X Y and Xue Q in 2008 et al. proposes the Tunable dual band bandpass filter realized in aforementioned manners, autograph
For " Novel centrally loaded resonators and their applications to bandpass
filter".The filter uses center loaded tunable capacitor, controls capacitance by control voltage, so that it is logical to control high frequency
Band frequency, without influencing compared with low frequency band connection frequency, to realize Tunable dual band bandpass characteristics.
But in the research of current double frequency band-pass filter, dimensional problem is still critical issue urgently to be solved,
Large-sized double frequency band-pass filter will affect its application.
Utility model content
Purpose of the utility model is to solve the oversized technological deficiencies of existing double frequency band-pass filter, provide one
Kind loads bending type defect micro-band technique using minor matters, realizes that compact dual-frequency bandpass filter, the filter not only minimize,
And it is functional, it is easy to process.
The purpose of this utility model can be by adopting the following technical scheme that obtain:
There is provided a kind of small sized double frequency bandpass filter using minor matters load bending type defected microstrip structure, comprising: center
Symmetrically arranged the first resonator for using open circuit minor matters load bending type defected microstrip structure and the second resonator and a pair
Central symmetry and the incoming feeder and output feeder for having impedance matching structure；The incoming feeder and the output feeder have
There are impedance matching structure and respectively the micro-strip input terminal by respective 50 ohm and output end direct feed；The first resonator packet
Containing the first open circuit minor matters and the first defected microstrip structure；Second resonator includes the second open circuit minor matters and the second defect micro-strip
Structure；It is described first open circuit minor matters and it is described second open circuit minor matters be bending type open circuit minor matters, it is described first open circuit minor matters and
The length of the second open circuit minor matters determines the centre frequency of second passband；First defected microstrip structure and described second
Defected microstrip structure is one section of L-shaped groove line, and the slotting position and groove width of the L-shaped groove line determine the coupling of first passband
Collaboration number, and the length of the entire L-shaped groove line determines the centre frequency of first passband.
In the small sized double frequency bandpass filter described in the utility model using minor matters load bending type defected microstrip structure
In, first resonator and second resonator be the half-wave resonator of both ends open circuit and first resonator and
There are slot-coupled between second resonator, coupling value determines the coefficient of coup of second passband.
In the small sized double frequency bandpass filter described in the utility model using minor matters load bending type defected microstrip structure
In, the incoming feeder and output feeder all have by wide to thin impedance matching structure.
The utility model compared with prior art, has the following advantages that and the utility model has the advantages that logical with existing microstrip double frequency band
Filter compares, and the utility model realizes the structure and dual frequency characteristics of miniaturization by 3 kinds of miniaturization methods；This is practical
The double frequency passband of novel generation, wherein first is oblong nature, and second is chebyshev characteristic, is suitble to the first passband high
The selectively filtering demands of the second passband low selectivity；The utility model does not have to the metal throuth hole for beating ground connection, directly prints PCB
Circuit is easy to process；Since the filter of the design uses planar structure, convenient for being integrated into circuit board, therefore the utility model ratio
Relatively it is suitble to be integrated on small mobile terminals device systems.
Detailed description of the invention
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:
Fig. 1 is the structural schematic diagram of small sized double frequency bandpass filter described in the utility model；
Fig. 2 is the Electromagnetic Simulation curve graph of the small sized double frequency bandpass filter frequency response.
Specific embodiment
The utility model is described in further detail combined with specific embodiments below.
As shown in Figure 1, using the small sized double frequency band logical of minor matters load bending type defected microstrip structure described in the present embodiment
Filter, mainly by the first resonator using open circuit minor matters load bending type defected microstrip structure of a pair of of center symmetric setting
1 and second resonator 2 be coupled to form, wherein bend first open circuit minor matters 3 and bending second open circuit minor matters 4 be first respectively
The open circuit minor matters of the bending of resonator 1 and the second resonator 2, wherein the first defected microstrip structure 5 and the second defected microstrip structure 6
It is the defected microstrip structure of the first resonator 1 and the second resonator 2 respectively.First resonator 1 and the second resonator 2 it is outer
Side is equipped with a pair of of central symmetry and has the coupling feed of impedance matching structure, respectively the first coupling feed 7 and the second coupling
Feeder line 8, this is to coupling feed 7 and 8 respectively by respective 50 ohm of 10 direct feed of microstrip line input terminal 9 and output end, wherein
Input terminal 9 and output end 10 are also central symmetry.
Further, for traditional half-wave resonator, shape is the straight resonator of both ends open circuit.Establish a centering
The heart symmetrical half-wave resonator has coupling between resonator, determines the coefficient of coup of second passband.By this to center pair
The half-wave resonator of title is bent, and can generate white space at center after bending.In order to make full use of space, do not increasing
In the case where adding size, the first open circuit minor matters 3 and second that one section bends are loaded by near caudal end part to resonator at this respectively and are opened
Road minor matters 4 load the mode of resonance of the length control higher-frequency of minor matters, determine the centre frequency of second passband.
Further, it after minor matters load work is completed, slots to the half-wave resonator of the load, passes through fluting
Realize the first defected microstrip structure 5 and the second defected microstrip structure 6 of resonator, slotting position and groove width determine first
The coefficient of coup of passband, and the length of entire L-shaped groove line then determines the centre frequency of first passband.After fluting script this
First resonator 1 and the second resonator 2 are reformed into half-wave resonator.It is by resonator outside and its to resonator feed
A pair of of central symmetry of coupling and the first coupling feed 7 and the realization of the second coupling feed 8 for having impedance matching structure.And it couples
Feeder line 7 and 8 is connected direct feed respectively by respective 50 ohm of microstrip line input terminal 9 with output end 10.
Bending of the utility model by resonator, the combination reality of 3 kinds of methods such as minor matters load and defected microstrip structure
The miniaturization of existing double frequency band-pass filter, the double frequency passband that the utility model generates, wherein first is oblong nature, and second
A is chebyshev characteristic, and it is highly selective to be particularly suitable for first passband needs, and second passband needs the spy of low selectivity
Different Miniature communication system.It is 2.55, with a thickness of 0.8 millimeter of FR4 medium base in dielectric constant according to above-mentioned specific embodiment
On plate, devises working frequency and filtered in the double frequency band-pass of WLAN (centre frequency 2.4GHz) and WIMAX (centre frequency 3.5GHz)
Wave device embodiment.As shown in Fig. 2, the bandwidth of first passband is 50MHz, the bandwidth of second passband is its frequency response chart
130MHz, the circuit size of entire double frequency band-pass filter are 25.4mm*10.2mm.
By being analyzed above it is recognised that the utility model had both contained the control of two passband central frequencies, further comprise
The control of bandwidth can satisfy the design requirement of small sized double frequency system, can be applied to the microwaves such as mobile communication, radar, remote sensing electricity
In subsystem, it is worthy to be popularized.
The examples of implementation of the above are only the preferred embodiment of the utility model, not limit the utility model with this
Practical range, therefore change made by all shapes according to the utility model, it should all cover within the protection scope of the present utility model.
Claims (3)
1. a kind of small sized double frequency bandpass filter using minor matters load bending type defected microstrip structure characterized by comprising
Center symmetric setting using open circuit minor matters load bending type defected microstrip structure the first resonator and the second resonator and
A pair of of central symmetry and the incoming feeder and output feeder for having impedance matching structure；The incoming feeder and the output feeder
All have impedance matching structure and respectively the micro-strip input terminal by respective 50 ohm and output end direct feed；First resonance
Device includes the first open circuit minor matters and the first defected microstrip structure；Second resonator includes the second open circuit minor matters and the second defect
Microstrip structure；The first open circuit minor matters and the second open circuit minor matters are bending type open circuit minor matters, the first open circuit branch
The length of section and the second open circuit minor matters determines the centre frequency of second passband；First defected microstrip structure and described
Second defected microstrip structure is one section of L-shaped groove line, and the slotting position and groove width of the L-shaped groove line determine first passband
The coefficient of coup, and the length of the entire L-shaped groove line determines the centre frequency of first passband.
2. the small sized double frequency bandpass filter according to claim 1 using minor matters load bending type defected microstrip structure,
It is characterized in that, first resonator and second resonator are the half-wave resonator and described first of both ends open circuit
There are slot-coupled between resonator and second resonator, coupling value determines the coefficient of coup of second passband.
3. the small sized double frequency bandpass filter according to claim 1 using minor matters load bending type defected microstrip structure,
It is characterized in that, the incoming feeder and output feeder all have by wide to thin impedance matching structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820990810.XU CN208315717U (en) | 2018-06-26 | 2018-06-26 | Using the small sized double frequency bandpass filter of minor matters load bending type defected microstrip structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820990810.XU CN208315717U (en) | 2018-06-26 | 2018-06-26 | Using the small sized double frequency bandpass filter of minor matters load bending type defected microstrip structure |
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| CN201820990810.XU Expired - Fee Related CN208315717U (en) | 2018-06-26 | 2018-06-26 | Using the small sized double frequency bandpass filter of minor matters load bending type defected microstrip structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137641A (en) * | 2019-06-17 | 2019-08-16 | 辽宁工程技术大学 | A kind of miniature double trap ultra-wide band filters based on the type of falling π resonator |
| CN110676554A (en) * | 2019-08-02 | 2020-01-10 | 杭州法动科技有限公司 | Low-profile ultra-wideband indoor communication plane structure antenna |
-
2018
- 2018-06-26 CN CN201820990810.XU patent/CN208315717U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137641A (en) * | 2019-06-17 | 2019-08-16 | 辽宁工程技术大学 | A kind of miniature double trap ultra-wide band filters based on the type of falling π resonator |
| CN110676554A (en) * | 2019-08-02 | 2020-01-10 | 杭州法动科技有限公司 | Low-profile ultra-wideband indoor communication plane structure antenna |
| CN110676554B (en) * | 2019-08-02 | 2021-04-30 | 杭州法动科技有限公司 | Low-profile ultra-wideband indoor communication plane structure antenna |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20190101 Termination date: 20190626 |