CN208385587U - A kind of small-sized three band-pass filter with eight transmission zeros - Google Patents
A kind of small-sized three band-pass filter with eight transmission zeros Download PDFInfo
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- CN208385587U CN208385587U CN201820990891.3U CN201820990891U CN208385587U CN 208385587 U CN208385587 U CN 208385587U CN 201820990891 U CN201820990891 U CN 201820990891U CN 208385587 U CN208385587 U CN 208385587U
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Abstract
本实用新型公开了一种具有八个传输零点的小型三频带通滤波器，该滤波器呈左右对称设置，主要包括采用弯折结构的第一短路谐振器和第二短路谐振器，用于产生第一个通带；开环枝节加载的第一开路谐振器和第二开路谐振器，用于产生第二个通带和第三个通带；以及采用源负载耦合的短路输入馈线和输出馈线。本实用新型在小尺寸的电路结构中，可实现三个通带中心频率和带宽可控，而且通过设计的八个传输零点，使得该滤波器具有较高的阻带抑制度和通带选择性。这种三频带通滤波器可以满足小型三频通信系统的设计要求，可应用于移动通信、雷达、遥感等微波电子系统中。
The utility model discloses a small three-band-pass filter with eight transmission zero points. The filter is arranged symmetrically on the left and right, and mainly comprises a first short-circuit resonator and a second short-circuit resonator adopting a bending structure, which are used for generating first passband; open-loop branch-loaded first and second open resonators for generating second and third passbands; and shorted input and output feeds with source-load coupling . In the circuit structure of the small size, the utility model can realize the controllability of the center frequency and the bandwidth of three passbands, and through the designed eight transmission zero points, the filter has a high stopband suppression degree and passband selectivity. . This three-band-pass filter can meet the design requirements of small three-band communication systems, and can be used in microwave electronic systems such as mobile communication, radar, and remote sensing.
Description
Technical field
The utility model relates to microwave technical fields, and in particular to a kind of small-sized three frequency band with eight transmission zeros is logical
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.And due to multifrequency front-end devices
Using the volume of system can save about half, and since many devices share or reuse, system power dissipation is than multiple single-frequency
Transceiver reduces, and corresponding equipment cost then substantially reduces.Primary Component of three band-pass filters as these communication front-ends,
Naturally it receives much attention.
According to investigations with understanding, it has been disclosed that the three band-pass filter prior arts 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 three controllable resonance frequencies using three-stage SIR, is cascaded by multistage resonator, realizes three frequency band pass filters
Device.
Chung-I G.Hsu in 2008 et al. proposes three band-pass filters realized in aforementioned manners, entitled " Tri-
band bandpass filter with sharp passband skirts designed using tri-section
SIRs ", the filter work in 1.57GHz, 2.45GHz and 3.5GHz.For three-stage SIR, K is adjusted1And K2, control SIR
Impedance ratio.To realize three frequency bandpass characteristics.
Second method: three band-pass filters are designed using the method for resonator parallel combination, three groups of single modes can be divided into
Resonator parallel combination is realized and one group of singlemode resonance device adds one group of dual-mode resonator parallel combination to realize.In general, it adopts
It is higher with the method design freedom of resonator parallel combination, but often size is larger, and the harmonic wave meeting of low frequency resonant modes
Have an impact to high-frequency resonant mode.
Xiao-Hu Wu in 2011 et al. proposes that a kind of bimodulus for adding one group of minor matters to load using one group of singlemode resonance device is humorous
Vibration device parallel combination realization, entitled " Novel compact tri-band bandpass filter with
controllable bandwidths".Wherein, third passband passes through a pair of of single mode half-wave resonator and realizes, and a pair of of short circuit
The dual-mode resonator of load separately designs as the first and second passbands.Three band connection frequencies and bandwidth with independent tuning and can be set
Meter.Half-wave resonator is embedded between two dual-mode resonators, and a part of the feeder line as the first and second passbands, from
And realize compact dimensioning.
The third method: utilizing three band-pass filter of minor matters designing load, 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 and utilizes this three model to generate three non-coupled module features
Property realize filter three frequency characteristics.
Fei Song in 2016 et al. proposes three band-pass filter of superconduction realized in aforementioned manners, entitled " A
novel tri-band superconducting filter using embedded stub-loaded resonators”。
The filter loads resonator using the embedded minor matters of three moulds, by controlling three resonance frequencies of the resonator, so that realizing can
Adjust three frequency bandpass characteristics.
But in the research of three current frequency filters, it is to be badly in need of solution that stopband, which inhibits the problem of problem and passband selectivity,
Critical issue certainly directly affects the application of filter.
Utility model content
Purpose of the utility model is to solve existing three band-pass filters belt resistance inhibitor systems not enough to select with passband
Property low technological deficiency, provide it is a kind of using source load coupling by short-circuit singlemode resonance device group and open circuit dual-mode resonator group
Parallel technology, realize small-sized three band-pass filter with eight transmission zeros.Not only band-pass behavior is good for the filter
It is good, and eight transmission zeros make filter belt resistance inhibitor system with higher and passband selectivity.
The purpose of this utility model can be by adopting the following technical scheme that obtain:
A kind of small-sized three band-pass filter with eight transmission zeros is provided, comprising:
It is described for generating first passband and using the first short-circuit resonant device and the second short-circuit resonant device of bending structure
First short-circuit resonant device and the second short-circuit resonant device are symmetrical set；
The first open-circuit resonant device and second that open loop minor matters for generating second passband and third passband load is opened
Road resonator, the first open-circuit resonant device and the second open-circuit resonant device are symmetrical set；
The incoming feeder and output feeder using source load coupling being symmetrical set；
Wherein, the incoming feeder and the output feeder pass through slot-coupled respectively to the first short-circuit resonant device
It is fed with the second short-circuit resonant device and the first open-circuit resonant device and the second open-circuit resonant device；The input feedback
Line and the output feeder are impedance matching structure and are directly presented by respective 50 ohm of micro-strip input terminal and output end respectively
Electricity；
The first short-circuit resonant device and the second short-circuit resonant device are the bending structure of one end open circuit short at one end；
The first open-circuit resonant device and the second open-circuit resonant device are loaded using center minor matters；The first open-circuit resonant device and second is opened
Road resonator passes through asymmetric coupling edge structure and carries out slot-coupled.
In small-sized three band-pass filter with eight transmission zeros described in the utility model, the incoming feeder
Slot-coupled is used between the output feeder.
In small-sized three band-pass filter with eight transmission zeros described in the utility model, the incoming feeder
It is short-circuit structure with the output feeder.
The utility model has the following beneficial effects: in the circuit structure of small size, it can be achieved that three passband central frequencies and
Bandwidth is controllable, and by eight transmission zeros of design, so that filter belt resistance inhibitor system with higher and passband choosing
Selecting property.This three band-pass filter can satisfy the design requirement of small-sized three frequencies communication system, can be applied to mobile communication, thunder
It reaches, in the microwave electrons system such as remote sensing.
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 three band-pass filter described in the utility model；
Fig. 2 is the Electromagnetic Simulation curve graph of the small-sized three band-pass filters frequency response.
Specific embodiment
In order to make combined with specific embodiments below, the utility model is described in further detail.
As shown in Figure 1, being that small-sized three band-pass filter one with eight transmission zeros described in the utility model is real
The structural schematic diagram of example is applied, the symmetrical setting of three band-pass filters, comprising: first the 1, second short circuit of short-circuit resonant device
Resonator 2, the first open-circuit resonant device 3, the second open-circuit resonant device 4, open circuit minor matters 5, open circuit minor matters 6, incoming feeder 7, output feedback
Line 8, input terminal 9 and output end 10；Wherein open circuit minor matters 5 and open circuit minor matters 6 are respectively the first open-circuit resonant device 3 and the second open circuit
The center loaded minor matters of resonator 4, incoming feeder 7 and output feeder 8 give a pair of of short-circuit resonant device 1 by slot-coupled respectively
With 2, and a pair of of open-circuit resonant device 3 and 4 is fed, and incoming feeder 7 and output feeder 8 are respectively by respective 50 ohm of micro-strip
10 direct feed of line input terminal 9 and output end.
Further, the first short-circuit resonant device 1 and the second short-circuit resonant device 2 are that the multistage of one end open circuit short at one end is curved
Folded structure, this bending short-circuit structure take full advantage of space, reduce the resonance frequency of resonator, realize miniaturization indirectly；
Bending short-circuit resonant device total length determines the centre frequency of the first passband, the first short-circuit resonant device 1 and the second short-circuit resonant device 2 it
Between coupling determine the coefficient of coup of the first passband, and the first higher hamonic wave of this short-circuit resonant device appears in the resonator
At the frequency tripling of resonance frequency, entire stopband is widened, so that higher order resonances mode will not influence second passband and third
Passband.
Further, the first open-circuit resonant device 3 and the second open-circuit resonant device 4 are all made of the load of center minor matters, center minor matters
Load refers to minor matters loading position at the center of entire open-circuit resonant device, by the surprise that the center minor matters are loaded with open-circuit resonant device
Even mould analysis, open loop length and minor matters length control the second passband central frequency and third passband central frequency respectively.
Further, the first open-circuit resonant device 3 and the second open-circuit resonant device 4 are using asymmetric coupling edge structure progress gap
Coupling, so that the second passband coefficient of coup and the third passband coefficient of coup can be with independent controls, wherein length L1 control second is logical
The band coefficient of coup, length L2 control the third passband coefficient of coup.
Further, incoming feeder 7 and output feeder 8 are all made of short-circuit structure, so that first transmission zero and the 8th
A transmission zero can be controlled by short-circuited feeder length, and first transmission zero and the 8th transmission zero are respectively used to change
The belt resistance inhibitor system of kind low-frequency stop band and high frequency stopband.
Further, slot-coupled is used between incoming feeder and output feeder, so that first transmission zero and the 8th
Six transmission zeros except a transmission zero are distributed at left and right sides of three passbands, for improving passband selectivity.
It is 2.55, with a thickness of on 0.8 millimeter of FR4 medium substrate in dielectric constant according to above-mentioned specific embodiment, if
Three frequency bands that working frequency has been counted in WLAN (centre frequency 2.4GHz and 5.2GHz) and WIMAX (centre frequency 3.5GHz) are logical
Filter embodiment.Its frequency response chart is as shown in Figure 2.The bandwidth of 3 passbands of filter is respectively 70MHz, 150MHz,
60MHz: wherein the frequency of eight transmission zeros is respectively as follows: 1.1GHz, 2.3GHz, 2.6GHz, 3.2GHz, 3.7GHz, 5.1GHz,
5.4GHz and 5.8GHz, the circuit size of entire three band-pass filter are 30mm*16.2mm.
A passband central frequency and bandwidth not only may be implemented in small-sized three band-pass filter of the utility model embodiment
Three all controllable frequency filtering characteristics, and can produce eight transmission zeros, wherein first transmission zero and the 8th transmission
Zero point is respectively used to improve the belt resistance inhibitor system of low-frequency stop band and high frequency stopband, and other six transmission zeros are located at three and lead to
The left and right sides of band, for improving passband selectivity.Therefore, the small-sized three band-pass filters belt resistance inhibitor system with higher
With passband selectivity, it can satisfy the design requirement of small-sized three display system, can be applied to the microwaves such as mobile communication, radar, remote sensing
In electronic system, 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 three band-pass filter with eight transmission zeros characterized by comprising
For generate first passband and using bending structure the first short-circuit resonant device and the second short-circuit resonant device, described first
Short-circuit resonant device and the second short-circuit resonant device are symmetrical set；
The the first open-circuit resonant device and the second open circuit that open loop minor matters for generating second passband and third passband load are humorous
Shake device, and the first open-circuit resonant device and the second open-circuit resonant device are symmetrical set；
The incoming feeder and output feeder using source load coupling being symmetrical set；
Wherein, the incoming feeder and the output feeder pass through slot-coupled respectively to the first short-circuit resonant device and institute
State the second short-circuit resonant device and the first open-circuit resonant device and the second open-circuit resonant device feed；The incoming feeder and
The output feeder is impedance matching structure and the micro-strip input terminal by respective 50 ohm and output end direct feed respectively；
The first short-circuit resonant device and the second short-circuit resonant device are the bending structure of one end open circuit short at one end；It is described
First open-circuit resonant device and the second open-circuit resonant device are loaded using center minor matters；The first open-circuit resonant device and the second open circuit are humorous
The device that shakes passes through asymmetric coupling edge structure and carries out slot-coupled.
2. small-sized three band-pass filter with eight transmission zeros according to claim 1, which is characterized in that described
Slot-coupled is used between incoming feeder and the output feeder.
3. small-sized three band-pass filter with eight transmission zeros according to claim 2, which is characterized in that described
Incoming feeder and the output feeder are short-circuit structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820990891.3U CN208385587U (en) | 2018-06-26 | 2018-06-26 | A kind of small-sized three band-pass filter with eight transmission zeros |
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| CN201820990891.3U CN208385587U (en) | 2018-06-26 | 2018-06-26 | A kind of small-sized three band-pass filter with eight transmission zeros |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190368A (en) * | 2019-05-23 | 2019-08-30 | 井冈山大学 | A small coaxial cavity three-band filter |
| CN110534852A (en) * | 2019-09-07 | 2019-12-03 | 西南交通大学 | Multifrequency band-pass filter based on in-parallel coupling splitted construction multimode resonator |
| CN115513627A (en) * | 2022-08-24 | 2022-12-23 | 声呐天空资讯顾问有限公司 | Frequency divider and antenna array |
-
2018
- 2018-06-26 CN CN201820990891.3U patent/CN208385587U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190368A (en) * | 2019-05-23 | 2019-08-30 | 井冈山大学 | A small coaxial cavity three-band filter |
| CN110190368B (en) * | 2019-05-23 | 2021-01-15 | 井冈山大学 | Small coaxial cavity three-frequency filter |
| CN110534852A (en) * | 2019-09-07 | 2019-12-03 | 西南交通大学 | Multifrequency band-pass filter based on in-parallel coupling splitted construction multimode resonator |
| CN115513627A (en) * | 2022-08-24 | 2022-12-23 | 声呐天空资讯顾问有限公司 | Frequency divider and antenna array |
| CN115513627B (en) * | 2022-08-24 | 2024-02-06 | Oppo广东移动通信有限公司 | Frequency divider and antenna array |
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