CN103579721A - Radio frequency filter, device comprising radio frequency filter and design method of device comprising radio frequency filters - Google Patents
Radio frequency filter, device comprising radio frequency filter and design method of device comprising radio frequency filters Download PDFInfo
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- CN103579721A CN103579721A CN201210264987.9A CN201210264987A CN103579721A CN 103579721 A CN103579721 A CN 103579721A CN 201210264987 A CN201210264987 A CN 201210264987A CN 103579721 A CN103579721 A CN 103579721A
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Abstract
The invention relates to the field of the radio wave frequency filtering technique, in particular to a small and exquisite radio frequency filter comprising a cavity and a strip line, a device comprising the radio frequency filters and a design method of the device comprising the radio frequency filter. The radio frequency filter comprises the metal strip line, the metal formation cavity and multiple supports, wherein the pass band frequency and bandwidth of the radio frequency filter are determined according to the size of the strip line, the metal formation cavity is used for accommodating the strip line and providing a Q value of the radio frequency filter, and all the supports are attached to the metal cavity and are connected to the strip line to fix the position of the strip line. The device comprising the radio frequency filters comprises the SACB of a first port and an SACB filter of a second port and a metal wall. The radio frequency filter and the device comprising the radio frequency filters have the advantages of being compact in structure, high in power processing capacity and low in loss.
Description
Technical field
The present invention relates to radio wave frequency technical field of filtering, particularly a kind of slimline radio-frequency filter that uses cavity strip line, containing device and the method for designing thereof of radio-frequency filter.
Background technology
Radio-frequency filter is a kind ofly in specific frequency range, allow or stop selected radiofrequency signal, or is used for eliminating/filtering out the device of unnecessary radiofrequency signal.The design of radio-frequency filter need to be considered decay or the transmission in frequency range.For example, radio-frequency filter can receive the radiofrequency signal of appointment, if there is the existence of hair-dryer, lamp or other " noise " device, also contributes to reduce contingent radio frequency interference.General filter function is as follows: band pass filter, select needed frequency band; Band stop filter, filtering unwanted frequency wave band; Low pass filter, only allows to pass through lower than the signal of cut-off frequency; High pass filter, only allows to pass through higher than the signal of cut-off frequency.
The signal frequency of radio frequency and microwave filter work is in megahertz arrives the scope of gigahertz.Most of broadcasting stations, TV, wireless telecommunications (mobile phone, Wi-Fi, etc.) be all applied in this frequency range, therefore most radio frequency and microwave equipments comprises transmitting and receiving the filter function of signal.This filter is usually used to build duplexer, in conjunction with or separated a plurality of frequency range.Therefore in general, radio frequency and microwave filter are normally comprised of one or more coupled resonatorses, and any technology that can make resonator can be used for making filter.
At present, utilize some known technology that radio-frequency filter can be received and transmitting radio wave in selected frequency range.For example, coaxial filter adopts coaxial transmission line can provide higher Q value than planar transmission line, therefore can meet high performance requirements.Thereby coaxial resonator uses high dielectric constant material to reduce its overall dimension.Yet the size of resonance filter is retrained by band connection frequency, so can not reduce to everybody desirable degree.
The most frequently used high power radio frequency filter is cavity body filter.Cavity body filter (as waveguide filter) provides high Q value, and rate of energy loss is low like this.Even under the electric load of a megawatt, cavity body filter also can have higher selectivity.By increasing the internal capacity of filter cavity, can obtain higher Q value, and higher stability.In the conventional cavity body filter size of 40 megahertz range, can surpass 82 inches, in 900 megahertz range, be less than 11 inches.At microwave range (1000 megahertzes (or 1G) or higher), although lamped element resonator and filter can reduce power loss, consider size and higher Q value, it is more practical that cavity body filter becomes.Yet similar with coaxial resonance filter, the size of cavity body filter also depends on band connection frequency.Therefore, can not reduce its physical size.
Cavity can be comprised of different medium material, makes resonator become dielectric filter.The same with coaxial resonator, use high dielectric constant material can reduce the overall dimensions of filter.Use low loss dielectric material that higher performance can be provided.The piezoelectric of electro-acoustic resonator can be used for filter.Because than the several orders of magnitude of electric wave length, electro-acoustic resonator is generally as less in cavity resonator than electromagnetism colleague at the wave length of sound of given frequency.An example of electro-acoustic resonator, quartz resonator, it is in fact that pair of electrodes clips a piezoelectric quartz crystal.This technical limitations is used in tens of megahertzes.For microwave frequency, thin film technique is if surface acoustic wave and bulk acoustic wave are for filter.Although dual-resonator microwave filter provides superior performance, the production of dual-resonator microwave filter relies on rare earth material.Therefore, cost of manufacture is high, and size is large.
Lc circuit claims again resonant circuit or tuning circuit, inductor L and capacitor C, consists of.When L and C link together, they can be used as an electrical resonator, form the oscillating circuit of a store electrical energy.In classical radio-frequency filter, circuit band connection frequency depends on resonance frequency,
, f
0it is resonance frequency.Yet due to the restriction of L and C device at present, it can not be for the base station of high Q value and high power handling ability.
Summary of the invention
The deficiency existing for above-mentioned prior art, the object of this invention is to provide a kind of cavity strip line radio-frequency filter, containing device and the method for designing thereof of radio-frequency filter, there is compact size (compare traditional resonator and reduce by 50% size) and high power handling ability and low-loss advantage.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
, comprise a metal band-shaped line, wherein the size of strip line is determined radio-frequency filter band connection frequency and bandwidth; A metal formation chamber that holds strip line provides radio-frequency filter Q value; With a plurality of supports, each support is attached on wire chamber and is connected to the position that strip line fixes strip line.
Further, described support is made by metal or other dielectric material.
Further, first support is connected to an end of strip line, and another support is connected to another end of strip line.
Further, first support is connected to an end of strip line, and another support is connected to another end of strip line, and the 3rd support is connected to strip line center.
Further, described metal formation chamber is full of air.
Further, described metal forms in cavity in vacuum state.
A device containing radio-frequency filter, comprises the banded cavity SACB of the slimline filter of first port, the banded cavity SACB of another slimline filter of second port, and metal wall.
Further, described device forms single layer structure by double layer of metal wall, and first SACB filter and second SACB filter are between First metal wall and second metal wall.
Further, described device forms double-decker by three-layer metal wall, and first SACB filter is between wall 1 and wall 2, and second SACB filter is between wall 2 and wall 3.
Further, this device is a duplexer, and wherein first SACB filter receives radio signals by first radio frequency ripple, and second SACB filter is by second radio frequency ripple transmitted radio signal.
Further, this device is a multiplexer, also comprise the 3rd and the 4th SACB filter, wherein first and the 3rd SACB filter receives radio signals by two different radio frequency waves, and second and the 4th SACB filter is by two different radio frequency ripple transmission radio signals.
A method that transmits and receives the slimline strip line cavity duplexer of radio-frequency filter, comprising: the upper limit, lower-cut-off frequency and the normalized frequency that by appointment, transmit and receive filter are carried out definition demand;
By genetic algorithm and Cauchy's method, generate the response function of emission filter and receiving filter;
Based on response function, generate a LC filter circuit that comprises inductance value L and capacitance C, re-use Richards and convert a LC filter circuit and be converted to SACB filter assembly parameter.
Further, thus use heredity and Cauchy's method to optimize the volume of the design parameter minimizing duplexer of SACB filter element.
Further, SACB filter comprises strip line and cavity, and design parameter comprises the size of strip line, the size of cavity.
Further, be used for designing and synthesizing the multiplexer being formed by four SACB filters.
A new method for designing of the present invention is wireless base station, mobile phone or other radio-frequency signal processing devices cavity strip line radio-frequency filter, duplexer and multiplexer compact to design.Target frequency bands is 600MHz～3GHz.This equipment has the advantages such as compact dimensions (compare traditional resonator and reduce by 50% size) and high power handling ability and low-loss.
On the one hand, the present invention is the filter of having introduced small and exquisite strip line and cavity (SACB) composition, and it combines metal band-shaped line and metallic cavity.The size of metal band-shaped line is to be determined by the wavelength of band connection frequency.The metallic cavity forming has determined the Q value of filter.In such filter, strip line by cavity loop around.From new angle, with the cavity strip line that mixes lumped reaction, be used to build radio-frequency filter, aspect insertion loss and reduction filter big or small, can obtain significant improvement in performance.Small and exquisite cavity filter forms by mixing lamped element, with the strip line of air chamber or vacuum chamber, builds.Mixing lamped element is the fusion of lamped element and distributed element, with distributed frame performance, concentrates attribute.
On the other hand, the present invention has introduced radio frequency duplexer, two compact strip line cavity filters, consists of.Strip line cavity filter is for reception of wireless signals and transmitting.The duplexer of compact strip lines configuration comprises that compact receives and emission filter.Each filter is SACB structure.Compact duplexer is a three-port network, receives and 2 output ports of transmitting channel formation.Input port is connected to input signal port (for example antenna port).
The present invention has also introduced radio frequency multiplexer.Radio frequency multiplexer is comprised of four SACB filters.Two in these four cavity strip line SACB filters is two different radio frequency ripple transmitting energies accepting under wireless mode, and another two SACB filters are two different radio frequency ripple transmitting energies under transmitting wireless mode.
A new synthetic method about SACB design of filter has been proposed in addition.In traditional method, receive and emission filter conduct filter independently respectively, by connector combination, become duplexer.Yet after combination, after needing, adjust to reach needed performance.In current invention, consider the impact of connector in duplexer and multiplexer, building-up process is used special synthetic method.The method, based on whole polynomials networks, is utilized genetic algorithm and Cauchy's method.This method for designing has been eliminated the rear adjustment process of duplexer and multiplexer.Therefore, composite filter has the advantages that size is little.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is a schematic diagram that comprises SACB duplexer reception/transmit network;
Fig. 2 is the structural representation of a radio frequency duplexer;
Fig. 3 is that the specification of a communication system is introduced schematic diagram;
Fig. 4 A is a brand-new individual layer duplexer schematic top plan view;
Fig. 4 B is a brand-new individual layer SACB filter schematic three dimensional views;
Fig. 5 A is the schematic side view of a plurality of layers of double multiplexer;
Fig. 5 B is the schematic three dimensional views of a brand-new multilayer SACB multiplexer;
Fig. 6 is the synthetic schemes of a SACB filter.
In figure: 301, frequency axis; 302, normalized frequency axle; 401, italic wire barrier shield 402, metallic shield wall; 403, emission port; 404, tie point; 405 receiving ports; 406, chamber; 451, strip line; 452, wire chamber; 453, end cap/support; 454, connecting hole; 455, steam vent; 456, end cap/support; 457, connecting hole; 458, steam vent; 459, steam vent; 501, metallic shield wall; 502, metallic walls; 503, metallic shield wall; 504, strip line; 505, strip line; 506, node;
507,508,509,510, support; 515, interior air cavity; 516, interior wall;
551,552,553, strip line; 554,555,556 wire chambers;
557,558,559,560,561,562, end cap; 564, steam vent.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment, is shown in shown in Fig. 1 to Fig. 6:
Fig. 1 has shown that a radio frequency sending and receiving network 100 comprises strip line cavity (SACB) radio frequency duplexer 102.Radio frequency network 100 adopts common antenna 101, for transmitter unit 103 together with receiving element 104.SACB radio frequency duplexer 102 is connected with transmitter unit 103, receiving element 104, antenna 101.SACB radio frequency duplexer 102 is to take the device that isolation transmitter 103 and receiver 104 be object.This will allow operation on antenna 101 that transmitter 103 and receiver 104 can be identical at one time, and transmitter 103 can not have a negative impact to receiver 104, and vice versa.
Fig. 2 is the simplified block diagram of radio frequency duplexer 200 structures.Duplexer 200 is comprised of two small and exquisite strip line cavity (SACB) filters 201 and 202.SACB filter 201 is transmitting energy under radio transmission pattern, and SACB filter 202 is transmitting energy under radio reception pattern.Source signal passes through transmitting filter 201 and 203 port transmission from transmit port 205.Then, signal transmission is gone out by the antenna transmission that is connected to port 204.At receive direction, the reception antenna of wireless signal is connected to port 204 by tie point 203.Then, signal arrives receiving port 206 by receiving filter 202.In Fig. 2, triangle symbol 207,208,209 and 210 represent ground connection.
Fig. 3 is radio frequency duplexer communication system specification figure.The performance of band pass filter is to be determined by its lower limit and upper cut-off frequency.Fig. 3 has shown the specification at frequency axis (f) 301 and normalized frequency axle (Ω) 302 duplexer filters.At frequency axis 301, F
1, RXand F
2, RXcorrespond respectively to upper cut-off frequecy of passband under receiving terminal, F
1, TXand F
2, TXrefer to respectively transmitting terminal lower limit and upper cut-off frequency.In design of filter, a given design can have different sample rates, therefore has different frequency responses.What normalization design produced is the sample rate of independent distribution, thereby a kind of design is just enough to tackle all possible sample rate.Therefore,, for realizing desired performance, first duplexer analyzes normalized frequency scope.Normalized frequency (Ω) is defined as Ω=(f
0/ B) (f/f
0-f
0/ f), f
0corresponding centre frequency, the corresponding bandwidth of B, f also should be in common frequencies.Normalized frequency-1 as shown in the figure and-Ω
rcorrespondence receives lower limit and the upper limit cut-off frequecy of passband of frequency range respectively, and normalized frequency-Ω
tlower limit and upper limit cut-off frequecy of passband with the corresponding transmit frequency band of 1 difference.
Fig. 4 A has proposed the vertical view of single layer structure duplexer 400, and the strip line of the different geometries representing with little grid shade is the main supporting assembly of duplexer 400.Part 403,405 and 404 is respectively the transmit port of duplexer, receiving port and tie point.Italic wire barrier shield 401 and 402 is metallic shield walls.In the cavity that in S A C B filter, strip line forms at metal wall, cavity holds strip line.Because strip line is to make with the metal of thick good heat conductivility, can bear larger I/O power, and can in wider temperature range, work.Because this filter is all made of metal, do not need to use expensive medium substrate, therefore, total manufacturing cost reduces greatly.In addition, filter is by metal, to be made completely, and it has good heat radiation and power handling capability.
In SACB filter, strip line and cavity are used for simulating L C resonator.Undersized filter can show the performance of the microwave filter of large-size, makes full use of the synthetic advantage of LC and the resultant effect of cavity obtains high Q filtering performance simultaneously.Strip line and cavity be in conjunction with the structure forming, and has inductance in resonant circuit and the performance of electric capacity.External signal will be connected to strip line place, and the cavity that metal shell forms is connected with ground.By controlling width and the length of strip lines configuration, and the size in chamber, can obtain the filter of desired response.Specifically, the strip line that does not contact sidewall is partly used as the electric capacity of similar lump, and the strip line of contact sidewall is partly used as the inductor of similar lump.Fig. 4 A, the strip line that does not contact sidewall in example partly comprises B and E part, and partly comprises A and C part with sidewall contact.For obtaining required strainability, as bandwidth and Q value, a series of strip line, 403,404 and 405, for example, represent that with chamber (, 406 chambeies) multistage resonator is used in SACB filter.
Fig. 4 B has described the three-dimensional visual angle figure of the SACB filter 450 of the single layer structure of mentioning.SACB filter 450 is comprised of metal-made cavity 452 and two Flat Lids 453 and 456 of the container as strip line 451.。Strip line 451 is fixed on usings 453 and 456 the link position as the hole of supporting.The insertion connecting hole 457 of 454 and the other end of connecting hole is inserted in strip line 451 one end.The object that wire chamber 452 may have duck eye (for example, steam vent 459) to ventilate in order to reach better hot-air.Similarly, this end cap also may have ventilation hole (for example, steam vent 455 and 458).Ventilation hole is optional, and they should be enough little, to avoid radio-frequency leakage.
With reference to figure 5A.In order further to reduce the overall size of duplexer filter, we can consider sandwich construction.Fig. 5 A, has described the double-decker of duplexer 500.Between metallic shield wall 501 and 503, insert metallic walls 502 and form 2 layers, layer 1 and layer 2.In layer 1, radio-frequency filter transmit direction is placed band shape 504, and in layer 2, radio-frequency filter receive direction is placed strip line 505.Note, strip line 504 and 505 is placed in the chamber being formed by metal wall.For example,, in the interior air cavity 515 of strip line 505 between metallic walls 502 and 503.Knot 506 is as 1 layer and 2 layers of connector being coupled mutually.With knot 506, make band shape transmit and receive end and be connected to form short circuit.
Strip line is partly placed in the formed cavity of metal wall, so fixed owing to supporting its position.Fig. 5 A, strip line 504 is connected to support 507 one end, and the other end is connected to support 508 and is supported.Similar, strip line 505 is supported by support 509 and 510.For example, support 513 has one end K to be pivotally connected to the inwall 516 of metal wall 503, and other end J is pivotally connected to strip line 505.The change of strip line length is long, and strip line can be supported better, but may need more support.For example, first support is connected to one end of strip line, and second support is connected to the other end of strip line, and the 3rd frame is connected to the approximate center of strip line.Supporter may be that metal or dielectric material are made.
Fig. 5 B describes the three-dimensional visual angle figure of the SACB multiplexer 550 that has sandwich construction.Multiplexer 550 is by strip line 551,552 and 553, wire chamber 554,555 and 556 and end cap/supporter 557,558,559,560,561 and 562 form.Chamber 554,555 and 556 comprises respectively strip line 551,552 and 553.The position of strip line is fixed by supporter.For example, strip line 553 is supporter 562 and 559 supports by two ends.In the cavity that metal forms, may there is duck eye, for hot-air ventilates.Equally, air vent hole can reduce two end cap (for example, steam vent 564).Ventilation hole is optional, and they should be enough little, to avoid radio-frequency leakage.
Fig. 6 is the flow chart of describing the design process of radio frequency duplexer.In order to make comb filter reduce interference each other, reduce volume, new analytical method and the application of proposition simultaneously.Designed filter will represent the characteristic of elliptic filter.As shown in the figure, at Fig. 6 center 601, the first step, designs a duplexer filter and specifies the requirement of passband and stopband to determine its specification.The definition of duplexer is included in the cut-off frequency of upper and lower bound under emission mode and receiving mode.Duplexer is by normalized frequency surface analysis.Normalized frequency (Ω) is Ω=(f
0/ B) (f/f
0-f
0/ f), at f.For corresponding centre frequency, B is corresponding bandwidth, the corresponding common frequencies of f.In 602 frames, formulated the mathematical formulae of the frequency response function of filter.The filter response function of proper polynomial form " approaches " the desirable filtering function of given filter specification.
S parametric description n port network reaction be created on the voltage signal of each port.First digit refers to echo port, and second refers to incident port.Therefore, S
21refer to the response of signal port 2 when port one.In duplexer, each reception and transmitting filter are two-port networks.For receiving filter, input is antenna, and output is receiving port.Equally, for emission filter, input is emission port and output is antenna.The reception of duplexer and the collision matrix of transmitting filter (S) are further expressed as:
Here, be S corresponding be s-parameter, f (s), p (s), e (s) builds whole filtering function characteristic of correspondence multinomial.Cauchy's method has been proved to be to be extracted under s parameter proper polynomial f (s) in filter, p (s), the effective ways of e (s).By above expression, in conjunction with the node of proper polynomial, the design of SACB performance of filter can be characterized by corresponding proper polynomial completely.In the situation that the signal transmission between input and output stops, in order to realize good passband, suppressing, should consider multiplexing of transmission zero frequency, be included in the prototype of last duplexer.
In 603, on the basis of the final design of proper polynomial, can determine the LC model of corresponding duplexer.In this step, determine the value of inductance L and capacitor C.In order to reduce the overall volume of duplexer, in LC model, corresponding L value and C value should be as much as possible little.
In 604, LC pattern is converted to SACB pattern and adopts Richard to convert inductance and the electric capacity of permission open circuit and short-circuited transmission line simulation lump part.In 605, when obtaining the equivalent electric circuit of the SACB duplexer within the scope of normalized frequency, Richard transforms and has been used for the frequency conversion from normalized frequency to final design frequency.In this process, the centre frequency of selecting by change can further reduce the volume of filter.At this step design parameter, comprise the size of width and length and the cavity of strip line.
In SACB filter, strip line and chamber are for simulating LC resonance (similar LC resonator).This similar LC element is used for realizing low-loss slimline radio-frequency filter.High Q value obtains by the cavity by rational size.New one side, composite filter, duplexer, thereby and multiplexer be according to Cauchy's method and genetic algorithm, to obtain the optimization of design parameter.Genetic algorithm is a kind of by the method for simulating nature evolutionary process search optimal solution.Cauchy's method is from measuring or simulated microwave passive device comprises an a kind of well-known technology that depression of order rational polynominal model is such of radio-frequency filter.Being commonly used to produce useful solution optimizes and search problem.Specifically, in the design of duplexer, on the basis of assessing in the proper polynomial of duplexer, apply a special program.This proper polynomial comprises the node of three ports, the TX of connection (transmitting channel) and RX (receive channel) filter.Here, consideration is applicable to the knot point (also can consider the knot point of waveguide and coaxial line) of three ports of strip line and cavity filter realization.The method of this innovation allows two independent filters that form synthetic (for example RX and TX filter).Also to consider the impact of the intersection of duplexer on whole device.According to same process, also can synthesizing multi-path multiplexer.
Composite filter/duplexer/multiplexer assembly obtains required design frequency by frequency of utilization converter technique and size has also reduced.Cauchy's method and the application of genetic algorithm are optimized the design of these parameters.In 606 steps, once whole design process complete, this filter, duplexer, and multiplexer is all by adopting strip line to form.
The above is only better embodiment of the present invention, and the equivalence of making according to the technological principle described in patent claim of the present invention therefore all changes or revises, and is included in patent claim of the present invention.
Claims (15)
1. a radio-frequency filter, is characterized in that, comprising: a metal band-shaped line, and wherein the size of strip line determines radio-frequency filter band connection frequency and bandwidth; A metal formation chamber that holds strip line provides radio-frequency filter Q value; A plurality of supports, each support is attached on wire chamber and is connected to the position that strip line fixes strip line.
2. radio-frequency filter according to claim 1, is characterized in that: described support is made by metal or other dielectric material.
3. radio-frequency filter according to claim 1, is characterized in that: first support is connected to an end of strip line, and another support is connected to another end of strip line.
4. radio-frequency filter according to claim 1, is characterized in that: first support is connected to a banded end, and another support is connected to another end of strip line, and the 3rd support is connected to strip line center.
5. radio-frequency filter according to claim 1, is characterized in that: described metal forms chamber and is full of air.
6. radio-frequency filter according to claim 1, is characterized in that: described metal forms in cavity in vacuum state.
7. a device containing radio-frequency filter, is characterized in that: comprise slimline strip line cavity (SACB) filter of first port, slimline strip line cavity (SACB) filter of second port, and metal wall.
8. the device containing radio-frequency filter according to claim 7, is characterized in that: described device forms single layer structure by double layer of metal wall, and first SACB filter and second SACB filter are between First metal wall and second metal wall.
9. the device containing radio-frequency filter according to claim 7, is characterized in that: described device forms double-layer structure by three-layer metal wall, and first SACB filter is between wall 1 and wall 2, and second SACB filter is between wall 2 and wall 3.
10. the device containing radio-frequency filter according to claim 7, it is characterized in that: this device is a duplexer, wherein first SACB filter receives radio signals by first radio frequency ripple, and second SACB filter is by second radio frequency ripple transmitted radio signal.
11. devices containing radio-frequency filter according to claim 7, it is characterized in that: this device is a multiplexer, also comprise the 3rd and the 4th SACB filter, wherein first and the 3rd SACB filter receives radio signals by two different radio frequency waves, and wherein second and the 4th SACB filter is by two different radio frequency ripple transmission radio signals.
12. 1 kinds of methods that contain the slimline strip line cavity duplexer that transmits and receives radio-frequency filter, is characterized in that, comprising: the upper limit, lower-cut-off frequency and the normalized frequency that by appointment, transmit and receive filter are carried out definition demand;
By genetic algorithm and Cauchy's method, generate the response function of emission filter and receiving filter;
Based on response function, generate a LC filter circuit that comprises inductance value L and capacitance C, re-use Richard and convert a LC filter circuit and be converted to SACB filter assembly parameter.
13. methods that contain the slimline strip line cavity duplexer that transmits and receives radio-frequency filter according to claim 12, is characterized in that: thus the design parameter that uses heredity and Cauchy's method to optimize SACB filter element reduces the volume of duplexer.
14. methods that contain the slimline strip line cavity duplexer that transmits and receives radio-frequency filter according to claim 12, is characterized in that: SACB filter comprises strip line and cavity, design parameter comprises the size of strip line, the size of cavity.
15. methods that contain the slimline strip line cavity duplexer that transmits and receives radio-frequency filter according to claim 12, is characterized in that: be used for designing and synthesizing the multiplexer being formed by four SACB filters.
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Cited By (1)
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| CN106654501A (en) * | 2016-12-15 | 2017-05-10 | 电子科技大学 | Manufacturing method for cavity resonator based on deformable high-temperature superconducting material |
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| CN200956396Y (en) * | 2006-09-11 | 2007-10-03 | 摩比天线技术（深圳）有限公司 | Broadband strip bandpass filter |
| CN1838476B (en) * | 2005-03-24 | 2010-04-28 | 华为技术有限公司 | Suspended mictrostrip filter and duplexer and method for designing and debugging filter |
| CN102354783A (en) * | 2011-08-02 | 2012-02-15 | 南京广顺网络通信设备有限公司 | Suspending microstrip structured high and low pass combiner |
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| CN1838476B (en) * | 2005-03-24 | 2010-04-28 | 华为技术有限公司 | Suspended mictrostrip filter and duplexer and method for designing and debugging filter |
| CN200956396Y (en) * | 2006-09-11 | 2007-10-03 | 摩比天线技术（深圳）有限公司 | Broadband strip bandpass filter |
| CN102354783A (en) * | 2011-08-02 | 2012-02-15 | 南京广顺网络通信设备有限公司 | Suspending microstrip structured high and low pass combiner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106654501A (en) * | 2016-12-15 | 2017-05-10 | 电子科技大学 | Manufacturing method for cavity resonator based on deformable high-temperature superconducting material |
| CN106654501B (en) * | 2016-12-15 | 2019-04-23 | 电子科技大学 | Cavity resonator production method based on deformable high temperature superconducting materia |
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Application publication date: 20140212 |