CN101420056A - Microstrip linear filter, duplexer and radio-frequency device - Google Patents
Microstrip linear filter, duplexer and radio-frequency device Download PDFInfo
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- CN101420056A CN101420056A CNA2007100310328A CN200710031032A CN101420056A CN 101420056 A CN101420056 A CN 101420056A CN A2007100310328 A CNA2007100310328 A CN A2007100310328A CN 200710031032 A CN200710031032 A CN 200710031032A CN 101420056 A CN101420056 A CN 101420056A
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Abstract
The invention discloses a microstrip line filter, which comprises a chamber which is provided with a PCB plate; the top and bottom inner wall of the PCB plate and the chamber are provided with a certain air height; the two sides of the PCB plate are both provided with corresponding cross cascaded transmission line and the cross cascaded transmission line arranged on one side of the PCB plate is connected with the transmission line on the other side through a hole. The invention also discloses a corresponding duplexer and a radio-frequency device. The embodiment of the invention has the advantages of simple producing processing, high quality rate, low transmission loss, low cost, etc.
Description
Technical field
The present invention relates to communication technical field, the duplexer and the radio-frequency unit that particularly relate to a kind of microstripline filter and constitute by this filter.
Background technology
Along with the develop rapidly of wireless communication technique, the communication apparatus of various frequency ranges, various standards constantly occurs and comes into operation, and for fear of the transmitting-receiving phase mutual interference that comprises between various communication system signals between self system, needs to use radio-frequency filter carry out filtering.Particularly on radio-frequency unit (as the wireless base station),, need to use duplexer in order on same antenna, to realize receiving and sending signal.
As shown in Figure 1, be the structural representation of existing a kind of duplexer; This duplexer adopts cavity dielectric filter form, and its principle is by the formation filter action that intercouples of electric field between the air resonance chamber and magnetic field, and the geometry in air resonance chamber has determined resonance frequency; But, because machining has determined the precision of cavity, cause using have equivalent electric perhaps the screw of inductance effect adjust, could satisfy the index of duplexer, this cavity dielectric filter has following shortcoming:
Yields is low: require high on, the machining accuracy poor in the production lot consistency;
The cost height: the processing and debugging complexity, the index frequency is adjusted complicated.Each cavity filter or cavity dielectric filter need have several, tens, tens screws to adjust repeatedly according to different index situations;
Manufacturing cycle is long: owing to need debugging repeatedly, the input manpower time is many, causes the manufacturing cycle long;
Cavity filter is a precision metallic workpiece in addition, and index request is higher, and it is very difficult therefore significantly to reduce cost.
Duplexer with traditional suspended mictrostrip structure realization has also appearred now, as shown in Figure 2, it is existing a kind of suspended mictrostrip filter, it comprises a cavity (being made up of with following shielding box 11 last shielding box 10 among the figure) that is formed by metal-back, a PCB double sided board 2 is set in this cavity, this PCB double sided board 2 is fixed on the madial wall of metallic cavity, and has certain air height 4 with the inwall up and down of metallic cavity; The one side of PCB double sided board 2 has the cross assistant warden as suspended mictrostrip to join transmission line 30 by the reservation shape etching.In this structure, by joining in the filter becoming the PCB cross assistant warden that can carry out good accuracy control by control machining cavity resonance size, the low-loss characteristics that kept the air transfer media simultaneously, have that volume is less, in light weight, structure flexibly, high conformity, lower-cost advantage in batches.
For the microstrip line among Fig. 2, its loss comprises three parts: radiation loss; Conductor losses; Dielectric loss.Wherein, radiation loss is generally very little, can ignore, and little band loss is mainly caused by conductor losses and dielectric loss;
Dielectric loss is caused by the pcb board medium substrate that mainly its size is relevant with the medium substrate material properties.So the duplexer among Fig. 2, if when adopting general pcb board material, then Zheng Ti loss ratio is bigger; If realize low loss,, then need to select for use high-grade radio frequency sheet material (as sheet materials such as RO3003), but the price of this sheet material is generally higher, the cost height with low loss angle tangent for example in some frequency applications occasions; And high-grade radio frequency sheet material material is generally softer, if assemble improperly, the deformation of pcb board easily causes index to change;
In addition, because the influence of conductor high frequency skin effect.The effective conductive cross-section that has reduced micro belt conductor is long-pending, causes that high-frequency loss strengthens, and this also is the heavy the best part of little band loss accounting.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of microstripline filter, duplexer and radio-frequency unit are provided, and filter wherein can be realized the transmission of low dielectric loss.
A kind of microstripline filter comprises a cavity, and a pcb board is set in the described cavity, and the inwall up and down of described pcb board and described cavity has certain distance; Be provided with corresponding cross assistant warden connection transmission line on the two sides of described pcb board, and the described cross assistant warden connection transmission line on the described pcb board one side joins transmission line with described cross assistant warden on the another side and is communicated with by via hole.
A kind of duplexer comprises a cavity, is provided with a pcb board in the described cavity, and the inwall up and down of described pcb board and described cavity has certain distance, and described pcb board is provided with little band emission filter and little band receiving filter; Described emission filter is equipped with the antenna end that links to each other with antenna with receiving filter, described emission filter is provided with the transmitting terminal that links to each other with transmitter circuitry, described receiving filter is provided with the receiving terminal that links to each other with receiver circuit, be provided with the cross assistant warden connection transmission line that forms described emission filter and receiving filter on the two sides of described pcb board, the described cross assistant warden connection transmission line on the described pcb board one side joins transmission line with the described cross assistant warden on the another side and is communicated with by via hole.
A kind of radio-frequency unit, comprise duplexer, antenna, transmitter circuitry and receiver circuit, described duplexer comprises a cavity, one pcb board is set in the described cavity, the inwall up and down of described pcb board and described cavity has certain distance, and described pcb board is provided with little band emission filter and little band receiving filter; The antenna end of described emission filter and receiving filter all is connected described antenna, the transmitting terminal of described emission filter connects described transmitter circuitry, the receiving terminal of described receiving filter connects described receiver circuit, be provided with the cross assistant warden connection transmission line that forms described emission filter and receiving filter on the two sides of described pcb board, the described cross assistant warden connection transmission line on the described pcb board one side joins transmission line with the described cross assistant warden on the another side and is communicated with by via hole.
Above-mentioned filter, duplexer and radio-frequency unit are communicated with by via hole by the cross joint transmission line at the positive and negative of PCB double sided board, can realize the transmission of low dielectric loss.
Description of drawings
Fig. 1 is the structural representation of existing a kind of duplexer median filter;
Fig. 2 is the structural representation of existing another kind of microstripline filter;
Fig. 3 is a microstripline filter schematic diagram in the one embodiment of the invention;
Fig. 4 is the structural representation of the one side of PCB double sided board in enforcement of the present invention;
Fig. 5 is a cross joint cell level transmission line structure schematic diagram among Fig. 4;
Reduce the schematic diagram of dielectric loss in Fig. 6 embodiment of the invention;
Fig. 7 is an another kind of cross joint cell level transmission line structure schematic diagram among Fig. 4;
Fig. 8 is a microstripline filter schematic diagram in another embodiment of the present invention;
Fig. 9 is the structural representation of one side of the PCB double sided board of duplexer in yet another embodiment of the invention;
Figure 10 is the schematic diagram of radio-frequency unit in the one embodiment of the invention.
Embodiment
The present invention is described in detail with preferred embodiment below in conjunction with accompanying drawing.
Seeing also shown in Figure 3ly, is the microstripline filter schematic diagram in the one embodiment of the invention.The basic structure of this microstrip filter comprises: a cavity that is formed by metal-back, described cavity comprises upper cavity 10 and lower chamber 11, one PCB double sided board 2 is set in the described cavity, PCB double sided board 2 is fixed on the madial wall of cavity, and PCB double sided board and metal-back has certain distance up and down between the inwall, in one embodiment, be air height; The tow sides of described PCB double sided board are provided with the cross joint transmission line 30 as filter of (as, etching) reservation shape, and the cross of positive and negative joint transmission line 30 is communicated with by at least one via hole 300.
As shown in Figure 4, be the structural representation of the one side of PCB double sided board 2 in enforcement of the present invention.Wherein, Fig. 4 only shows the structural representation on the wherein one side of PCB double sided board 2, the structure of its another side identical or similar with shown in Fig. 4; The cross joint transmission line 30 that reservation shape is arranged in the equal etching of each face of PCB double sided board 2, wherein this cross joint transmission line 30 saves unit cascaded the composition by as shown in Figure 5 cross more than the joint, and each grade cross joint unit all comprises cross joint 33, open-circuit line 32 and the transmission line 31 of predetermined structure size, a resonator or impedance transducer are formed in each cross joint unit, form filter by a plurality of cross joints unit of cascade simultaneously; On the pcb board that leaves cross assistant warden connection transmission line 30 certain distances, all be covered with the PCB ground 21 that communicates (as, copper sheet), be used to form the barrier shield between the cross cascade transmission line 30, be used for reducing the intercouple influence of cross between saving.Described PCB double sided board 2 is installed in when shielding box is middle up and down, positive and negative PCB ground 21 closely contacts with cavity up and down, and by metal fastenings (as, screw etc.) PCB ground 21 is tightly linked to each other with cavity up and down, and the PCB ground 21 on PCB double sided board 2 tow sides can pass through through hole 210 connections; This mode had both made filter possess good heat sinking function, also had good shield effectiveness simultaneously.In addition, the described via hole 300 that is used to be communicated with the cross transmission line 30 on PCB double sided board 2 positive and negatives can be located at cross joint 33, open-circuit line 32 and the transmission line 31 of described each cross joint unit.In other embodiment, open-circuit line 32 also can be a short-circuit line; Be that example describes with the open-circuit line among the following embodiment, understandable is that open-circuit line wherein all can replace to short-circuit line.
In an embodiment of the present invention, because etching has cross joint transmission line 30 on two-sided on the PCB double sided board 2, and two-sided cross joint transmission line 30 is communicated with by at least one via hole 300.Such structure can make the dielectric loss of microstrip line reduce, as shown in Figure 6, and for reducing the schematic diagram of dielectric loss in the embodiment of the invention; It is one section unsettled thick conductor (shown in Fig. 6 right side) that the structure that the embodiment of the invention adopted can make the field distribution Approximate Equivalent of little band transmission, be H1 and H2 approximately equal, cause its transmission medium equivalence to be air, be that dielectric loss is compared much lower with other transmission mediums, even use common pcb board material (as, FR-4 sheet material) also identical effect can be reached, the whole cost of filter can be reduced; Other increases effective transmission area of conductor, has reduced the influence of skin effect, can greatly reduce conductor losses, when higher frequency band is used, has very large advantage.
In actual applications, the frequency shift (FS) index of the filter of actual finished product is mainly determined by cross assistant warden connection transmission line figure machining accuracy on the PCB double sided board, and the machining accuracy of PCB (as, less than 0.5mil) far above the machining accuracy of mechanical structure (as, about 2～4mil).The yields of the filter of the employing embodiment of the invention is high.Be arranged in the lower chamber as long as the PCB double sided board put, the coaxial connector of burn-oning is added upper cavity, and upper and lower cavity body and function screw is fastening, need not any debugging.
The cross joint graphics shape of the cross assistant warden connection transmission line 30 in the embodiment of the invention, size and cross assistant warden connection number can be decided according to the specific design demand, and be unrestricted.And in actual applications, can also be according to concrete needs, suspended mictrostrip filter of the invention process is carried out deformation process, for example in order to dwindle filter size, as shown in Figure 7, can bend processing, promptly be provided with bending part 321 in the precalculated position of the open-circuit line of cross joint unit to the cross joint open-circuit line of cross assistant warden connection transmission line, have same effect, can reduce the cross assistant warden and join the area that transmission line takies the PCB double sided board.
As shown in Figure 8, be the schematic diagram of the filter in another embodiment of the present invention.Be the power capacity of the microstrip line that adapts to the embodiment of the invention or the demand of impedance matching aspect, the bottom surface inwall can be used as the reference planes of microstrip line on the shielding cavity; When the width that is used for controlling microstrip line is used the reference planes of sustained height sometimes, a certain joint main line or branch line might be very wide or very narrow, widely cause taking the PCB area and strengthen, cost rises: the narrow problem that has power capacity and relative error control aspect.The plane of reference up and down by the shielding box cavity is set to stepped, even have unequal to described cavity inner wall of two cross assistant wardens connection transmission line correspondences on the pcb board one side at least over against distance (being the height of the plane of reference), can make design and manufacturing simpler, only need to come balanced live width by the height of regulating the plane of reference; For example in one embodiment, the microstrip transmission line for the big live width of needs can be designed to its plane of reference higher relatively; In like manner, for thinner microstrip transmission line, its plane of reference can be designed to relatively low.
In an embodiment of the present invention, it can make one of them plane of reference stepped form as shown in Figure 8, reference planes up and down all can be made stepped form, the ladder form should not be limited to shape and the number in figure below yet, and shielding box chamber outer surface shape is not limit.
Utilize the microstripline filter of previous embodiment can form duplexer.
As shown in Figure 9, be the schematic diagram of duplexer of the present invention; Simultaneously please in conjunction with Figure 10.Duplexer of the present invention is made up of emission filter and receiving filter, and emission filter and receiving filter are provided with the antenna end of joining, and can be connected with antenna; Emission filter is provided with a transmitting terminal (TX), can connect transmitter circuitry; Receiving filter is provided with a receiving terminal (RX), can connect receiver circuit.Duplexer allows transmitter signal from transmitter circuitry only by transmitter band guiding antenna, allows simultaneously only by frequency acceptance band it to be fed to receiver from the received signal of antenna, realizes carrying out receiving and transmitting signal simultaneously with the same antenna; Adopt duplexer can prevent to transmit interference, and received signal is to the interference of transmitter circuitry to receiver circuit.
In conjunction with shown in Figure 3, the duplexer in the embodiment of the invention comprises a cavity that is formed by metal-back equally, is provided with emission filter and receiving filter in the described cavity in the lump; One PCB double sided board is fixed on the sidewall of described metal-back, and etching has at least one group of cross assistant warden connection transmission line on the described PCB double sided board, as emission or receiving filter; The inwall up and down of PCB double sided board and described metal-back has certain air height.Described PCB double sided board same worn respectively two groups of cross assistant wardens connection transmission lines as emission filter and receiving filter, described emission filter be connected with an end of receiving filter (as, adopt the connection of T type); The PCB double sided board is fixed on up and down in the middle of the shielding box, and the ground of PCB directly contacts with shielding box up and down; Described antenna end, transmitting terminal (TX), receiving terminal (RX) are connected with antenna, transmitter circuitry, receiver circuit respectively by coaxial connector.Duplexer of the present invention in force, the another side of described PCB two-shipper plate is provided with the cross assistant warden connection transmission line of the emission filter of formation and receiving filter equally, and the PCB double sided board wherein one side go up as joining transmission line as the cross assistant warden of emission filter on the cross assistant warden connection transmission line of emission filter and the another side and be connected by the hole; And on the PCB double sided board wherein one side go up as joining transmission line as the cross assistant warden of receiving filter on the cross assistant warden connection transmission line of receiving filter and the another side and be connected by the hole.The above-mentioned duplexer of forming with suspended mictrostrip filter has all advantages of aforementioned suspended mictrostrip filter.
The schematic diagram of a kind of radio-frequency unit of the embodiment of the invention is shown as shown in figure 10; Described radio-frequency unit comprises antenna, and duplexer, receiver circuit and transmitter circuitry are provided with little band emission filter and little band receiving filter in the described duplexer; The antenna end of described emission filter and receiving filter all is connected described antenna, and the transmitting terminal of described emission filter connects described transmitter circuitry, and the receiving terminal of described receiving filter connects described receiver circuit.Wherein the more details of microstripline filter and duplexer can find in aforementioned description to Fig. 3 to Fig. 9, do not repeat them here.
Implement filter, duplexer, the radio-frequency unit of the embodiment of the invention, have following advantage:
Processing is simple, need not debugging, the yields height;
Can reduce cost greatly, expectation is 1/3～2/3 of a cavity body filter cost; Be easy to produce in batches, and delivery cycle can shorten greatly;
Be communicated with via hole by the cross joint transmission line at the positive and negative of PCB double sided board, can realize good radio frequency transmission on common sheet material, loss is low;
The plane of reference up and down by the shielding box cavity is set to stepped, can control the thickness of microstrip transmission line easily, makes design and makes simpler.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1, a kind of microstripline filter comprises a cavity, and a pcb board is set in the described cavity, and the inwall up and down of described pcb board and described cavity has certain distance; It is characterized in that:
Be provided with corresponding cross assistant warden connection transmission line on the two sides of described pcb board, and the described cross assistant warden connection transmission line on the described pcb board one side joins transmission line with described cross assistant warden on the another side and is communicated with by via hole.
2, filter as claimed in claim 1 is characterized in that: the cross assistant warden connection transmission line on each face of described pcb board comprises the cross joint unit of the above cascade of a joint; Described each grade cross joint unit comprises cross joint, open-circuit line and transmission line; Perhaps described each grade cross joint unit comprises cross joint, short-circuit line and transmission line; And be provided with the PCB ground that communicates on the pcb board that leaves described cross assistant warden connection transmission line certain distance, described PCB ground links to each other with described cavity.
3, filter as claimed in claim 2 is characterized in that, described via hole is arranged at least one of cross joint, open-circuit line, short-circuit line or transmission line of described cross joint unit.
4, filter as claimed in claim 3 is characterized in that: described cavity comprises shielding box and following shielding box, and the described pcb board that has cross assistant warden connection transmission line is fixedly mounted on up and down between the shielding box; PCB ground on the pcb board two sides is communicated with by through hole, and links to each other with described shielding box up and down.
5, as each described filter of claim 1 to 4, it is characterized in that: have unequal to described cavity inner wall of two cross assistant wardens connection transmission line correspondences on the described pcb board one side at least over against distance.
6, a kind of duplexer comprises a cavity, is provided with a pcb board in the described cavity, and the inwall up and down of described pcb board and described cavity has certain distance, and described pcb board is provided with little band emission filter and little band receiving filter; Described emission filter is equipped with the antenna end that links to each other with antenna with receiving filter, and described emission filter is provided with the transmitting terminal that links to each other with transmitter circuitry, and described receiving filter is provided with the receiving terminal that links to each other with receiver circuit, it is characterized in that:
Be provided with the cross assistant warden connection transmission line that forms described emission filter and receiving filter on the two sides of described pcb board, the described cross assistant warden connection transmission line on the described pcb board one side joins transmission line with the described cross assistant warden on the another side and is communicated with by via hole.
7, duplexer as claimed in claim 6 is characterized in that: the cross assistant warden connection transmission line on each face of described pcb board comprises the cross joint unit of the above cascade of a joint; Described each grade cross joint unit comprises cross joint, open-circuit line and transmission line; Perhaps described each grade cross joint unit comprises cross joint, short-circuit line and transmission line; And be provided with the PCB ground that communicates on the pcb board that leaves described cross assistant warden connection transmission line certain distance, described PCB ground links to each other with described cavity.
8, duplexer as claimed in claim 7 is characterized in that, described via hole is arranged at least one of cross joint, open-circuit line, short-circuit line or transmission line of described cross joint unit.
9, duplexer as claimed in claim 8 is characterized in that: described cavity comprises shielding box and following shielding box, and the described pcb board that has cross assistant warden connection transmission line is fixedly mounted on up and down between the shielding box; PCB ground on the pcb board two sides passes through through hole connection at least, and links to each other with described shielding box up and down.
10, as each described duplexer of claim 6 to 9, it is characterized in that: have unequal to described cavity inner wall of two cross assistant wardens connection transmission line correspondences on the described pcb board one side at least over against distance.
11, a kind of radio-frequency unit, comprise duplexer, antenna, transmitter circuitry and receiver circuit, described duplexer comprises a cavity, one pcb board is set in the described cavity, the inwall up and down of described pcb board and described cavity has certain distance, and described pcb board is provided with little band emission filter and little band receiving filter; The antenna end of described emission filter and receiving filter all is connected described antenna, and the transmitting terminal of described emission filter connects described transmitter circuitry, and the receiving terminal of described receiving filter connects described receiver circuit, it is characterized in that:
Be provided with the cross assistant warden connection transmission line that forms described emission filter and receiving filter on the two sides of described pcb board, the described cross assistant warden connection transmission line on the described pcb board one side joins transmission line with the described cross assistant warden on the another side and is communicated with by via hole.
12, radio-frequency unit as claimed in claim 11 is characterized in that: the cross assistant warden connection transmission line on each face of described pcb board comprises the cross joint unit of the above cascade mutually of a joint; Each grade cross joint unit comprises cross joint, open-circuit line and transmission line; Perhaps described each grade cross joint unit comprises cross joint, short-circuit line and transmission line; And be provided with the PCB ground that communicates on the pcb board that leaves described cross assistant warden connection transmission line certain distance, described PCB ground links to each other with described cavity.
13, radio-frequency unit as claimed in claim 12 is characterized in that, described via hole is arranged at least one of cross joint, open-circuit line, short-circuit line or transmission line of described cross joint unit.
14, radio-frequency unit as claimed in claim 13 is characterized in that: described cavity comprises shielding box and following shielding box, and the described pcb board that has cross assistant warden connection transmission line is fixedly mounted on up and down between the shielding box; PCB ground on the pcb board two sides passes through through hole connection at least, and links to each other with described shielding box up and down.
15, radio-frequency unit as claimed in claim 14 is characterized in that: the open-circuit line or the short-circuit line of described cross joint unit are provided with bending part in the precalculated position.
16, radio-frequency unit as claimed in claim 15 is characterized in that: the barrier shield that adopts PCB ground to form between the adjacent and continuous cross joint on the described pcb board is isolated.
17, as each described radio-frequency unit of claim 11 to 16, it is characterized in that: have unequal to described cavity inner wall of two cross assistant wardens connection transmission line correspondences on the described pcb board one side at least over against distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100310328A CN101420056A (en) | 2007-10-24 | 2007-10-24 | Microstrip linear filter, duplexer and radio-frequency device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100310328A CN101420056A (en) | 2007-10-24 | 2007-10-24 | Microstrip linear filter, duplexer and radio-frequency device |
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| CN101420056A true CN101420056A (en) | 2009-04-29 |
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| CNA2007100310328A Pending CN101420056A (en) | 2007-10-24 | 2007-10-24 | Microstrip linear filter, duplexer and radio-frequency device |
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| 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 |
| CN102378549A (en) * | 2010-08-19 | 2012-03-14 | 中兴通讯股份有限公司 | Radiating device of outdoor radio frequency unit |
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| 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 |
| CN103035987A (en) * | 2011-09-28 | 2013-04-10 | 百一电子股份有限公司 | Vertical filter and manufacture method thereof |
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| CN102742071B (en) * | 2011-12-08 | 2014-04-16 | 华为技术有限公司 | Filter |
| CN102610888B (en) * | 2012-02-27 | 2014-03-05 | 浙江纺织服装职业技术学院 | Radio frequency filter capable of automatically sensing and rapidly regulating frequency and bandwidth |
| CN102610888A (en) * | 2012-02-27 | 2012-07-25 | 浙江纺织服装职业技术学院 | Radio frequency filter capable of automatically sensing and rapidly regulating frequency and bandwidth |
| CN103004013A (en) * | 2012-06-21 | 2013-03-27 | 华为技术有限公司 | Cavity filter and manufacturing method thereof |
| CN102811024A (en) * | 2012-08-17 | 2012-12-05 | 昆山美博通讯科技有限公司 | Transmission line structure of low-loss power amplifier |
| CN103475387A (en) * | 2013-04-22 | 2013-12-25 | 江苏声立传感技术有限公司 | Method for improving signal detection sensitiveness of SAW (surface acoustic wave) wireless sensing |
| CN108123194A (en) * | 2016-11-30 | 2018-06-05 | 凯镭思通讯设备（上海）有限公司 | A kind of thin-walled stretches cavity body filter and production method |
| CN107403984A (en) * | 2017-07-14 | 2017-11-28 | 成都九洲迪飞科技有限责任公司 | Suspend the high suppression high-pass filter of micro-strip |
| CN112563704A (en) * | 2019-09-25 | 2021-03-26 | 天津大学 | Self-packaged wide-stop-band-pass filter based on medium integrated suspension line |
| US11470695B2 (en) | 2020-04-28 | 2022-10-11 | Northrop Grumman Systems Corporation | Filter with an enclosure having a micromachined interior using semiconductor fabrication |
| WO2022015398A1 (en) * | 2020-07-17 | 2022-01-20 | Northrop Grumman Systems Corporation | Channelized filter using semiconductor fabrication |
| US11373965B2 (en) | 2020-07-17 | 2022-06-28 | Northrop Grumman Systems Corporation | Channelized filter using semiconductor fabrication |
| GB2612471A (en) * | 2020-07-17 | 2023-05-03 | Northrop Grumman Systems Corp | Channelized filter using semiconductor fabrication |
| US12022608B2 (en) | 2021-03-11 | 2024-06-25 | Northrop Grumman Systems Corporation | Radio frequency crossover with high isolation in microelectronics H-frame device |
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