CA1194157A - Waveguide manifold coupled multiplexer - Google Patents
Waveguide manifold coupled multiplexerInfo
- Publication number
- CA1194157A CA1194157A CA000455284A CA455284A CA1194157A CA 1194157 A CA1194157 A CA 1194157A CA 000455284 A CA000455284 A CA 000455284A CA 455284 A CA455284 A CA 455284A CA 1194157 A CA1194157 A CA 1194157A
- Authority
- CA
- Canada
- Prior art keywords
- filter
- multiplexer
- filters
- plane
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2082—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with multimode resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
- H01P1/2138—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using hollow waveguide filters
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
ABSTRACT
A multiplexer has a plurality of bandpass filters coupled through E-plane or H-plane T-junctions to a waveguide manifold. Where the multiplexer has four channels and each filter is a six-pole filter, two triple mode cavities make up each filter. Where each filter is a five-pole filter, one triple cavity and one dual mode cavity makes up each filter. Two band edge channel filters- are operated to produce an asymmetrical filter function response, thereby causing extra trans-mission zeros to be created and improving the select-ivity of the filter out of the passband. The multiplexer is designed for use in satellite communication systems and can have a reduced volume and weight when compared to previous multiplexers without any sacrifice in electrical performance.
A multiplexer has a plurality of bandpass filters coupled through E-plane or H-plane T-junctions to a waveguide manifold. Where the multiplexer has four channels and each filter is a six-pole filter, two triple mode cavities make up each filter. Where each filter is a five-pole filter, one triple cavity and one dual mode cavity makes up each filter. Two band edge channel filters- are operated to produce an asymmetrical filter function response, thereby causing extra trans-mission zeros to be created and improving the select-ivity of the filter out of the passband. The multiplexer is designed for use in satellite communication systems and can have a reduced volume and weight when compared to previous multiplexers without any sacrifice in electrical performance.
Description
This inVention relates to multiplexers and, in particular, to contiguous~ band multiplexers having at least one filter with a cavity resonating in a triple mode for use in satellite communication systems.
Contiguous frequency band multiplexers are known but, in previous multiplexers, dual mode or single mode filters are used. The volume and weight of previous multiplexers is significantly greater than the volume or weight required with the multiplexer in accordance with 10 the present invention in order to produce similar results. Also, the multiplexer of the present invention is able to produce improved passband performance and band edge selectivity over previous multiplexers.
Poor selectivity on a band edge channel filter 15 of previous contiguous band multiplexers has been a long-standing problem in the communications satellite industry.
In accordance with the present invention, a multiplexer has a plurality of bandpass filters coupled 20 through E-plane or H-plane T-junctions to a waveguide manifold. At least one filter has a cavity that resonates in a triple mode when said filters are ./r;~ operated in suitable propagation modes to produc ~ `a~l quasi-elliptic of elliptic function responses. - Y
25 ~r~ each filter has two or more cavities with one of said cavities resonating in a triple mode.
In the following drawings, there are shown embodiments of the present invention:
Figure 1 is a partially exploded perspective 30 view of a four channel contiguous band multiplexer having one cavity in each filter operating in triple mode and the remaining cavity of each filter operating in dual mode;
Figure 2 is a front View of an iris used in 119~S~
the multiplexer;
Figure 3 is a front view of another type of iris used in the multiplexer;
Figure 4 is a ~d~l=~o~ perspective view of a four channel multiplexer where all filters are coupled to E-plane, T-junctions of a manifold;
Figure 5(a) is a graph showing the frequency response of a prior art four channel contiguous ba~d multiplexer having sixth order dual mode quasi-elliptic function filters;
Figure 5(b) is a graph showing the frequency response of a multiplexer constructed in accordance with that shown in Figure 1.
Referring to the drawings in greater detail, in Figure 1 there is shown a multiplexer 2 having four channels or bandpass filters 4, 6, 8, 10, in cascade, coupled to a waveguide manifold 12. Each filter 4, 6, 8, 10 has two cavities 14, 16. Each cavity 14 resonates in triple mode and each cavity 16 resonates in dual mode. Preferably, each cavity 14 resonates in first TElll, second TMolo and third TElll mode while each cavity 16 resonates in first and second TE
mode.
An iris 18 having an aperture 20 is located between the cavities 14, 16 of the filters 4, 10. An iris 22 having an aperture 24 is located between the cavities 14, 16 of the filters 6, 8. The irises 18, 22 proviZe inter-cavity coupling means between the cavities 14, 16 of the particular filters in which they are installed. Then cavity 14 has an input coupling through coaxial probe 17.
Inter-cavity coupling is achieved by means of a physical discontinuity which perturbs the electrical field of one mode to couple energy into another mode.
The cavities 14 have coupling screw 26 and tuning 1~41S7 screws 28, 30. The cavities 14 having coupling screws 32, 34 to provide coupling between the two orthogonal TElll modes. Coupling between the TElll mode and the TEolo mode in cavities 14 is provided by coupling screw 36, 38. Tuning screws 40, 42, 43 provide frequency tuning of the TElll orthogonal mode. Tuning screw 44 provides frequency tuning of the TMolo mode. The same arrangement of tuning screws and coupling screws as that shown for ca~ities 14, lS of filter 4 is the same for the cavities 14, 16 of the three remaining filters 6, 8, 10 but is not shown on these remaining filters.
Filters 4, 10, being the band edge channels, are five-pole quasi-elliptic function filters ~ith three transmission zeros. Filters 6, 8 are five-pole quasi-elliptic function filters with one pair of transmission zeros.
As stated above, inter-cavity coupling between the dual mode cavity 16 and the triple mode cavity 14 of each filter is provided through the apertures shown.
Coupling aperture 20 of iris 18 provided the necessary coupling for the third transmission zero for each of the band edge channels, being filters 4, 10. All four filters 4, 6, 8, 10 are coupled to H-plane, T-~unctions 46 of the waveguide manifold 12 through output couplings provided by aperture 48 located in an end 50 of each cavity 16. The aperture 48 is only shown for the filter 4 but exists in the remaining filters 6, 8, 10 as well. The T-junctions 46 are connected in cascade to form the manifold 12. One end of the manifold 12 is terminated by short circuit plate 52.
r~hile the filters shown in Figure 1 are of fifth order filter function, filters can be designed of any order realized in a cascade of triple mode cavities alone or triple mode cavities along with dual mode ~lg4157 cavities or single mode cavities. For example, in a four channel multiplexer, each filter can have two cavities where each cavity resonates in a triple mode so that each filter is of the sixth order. Also, other forms of asymmetrical filter functions can be used for the improvement of band edge channel selectivity.
In Figure 2, an iris 18 has an aperture 20. The aperture is cruciform in shape and is used in filters 4, 10 as these are the band edge filters and produce an asymmetrical electrical response. In Figure 3, there is shown an iris 22 having an aperture 24 which is a single slot. Filters 6, 8 require the use of coupling iris 22 in order to produce a symmetrical electrical response.
In Figure 4, a multiplexer 2 has filters 4, 6, 8, 10 coupled to E-plane, T-junction 54 of waveguide manifold 56. All four filters 4, 6, 8, 10 are coupled to E-plane, T-junction 54 of the manifold 56 through output coupling provided by aperture 58 located in a side 60 of each cavity 61. The manifold 56 is terminated at one end by a short circuit plate 62.
Each of the filters 4, 6, 8, 10 has two cavities, 61, 63, each cavity resonating in a triple mode.
Preferably, each cavity 61, 63 resonates in a first, TElll, a second TMolo and a third TElll mode. An iris 64 having an aperture 66 is represented by four radially separate and equidistant slots. The iris 64 provides inter-cavity coupling means between the cavities 61, 63 and is located in each of the filters 4, 6, 8, 10, even though it is only shown in the filter 4. Cavity 63 of the filter 4 has an input coupling through coaxial probes 68.
The cavities 61, 63 of each filter 4, 6, 8, 10 :~1941S7 have coupling screws 70, 72 to provide coupling between the two orthogonal TElll and TMolo modes- Tuning screws 74, 76 provide frequency tuning of the first TElll and the third TElll modes. Tuning screw 78 provides frequency tuning of the TMolo mode. The same arrange-ment of tuning screws and coupling screws as that shown for cavities 61, h3 of filter 4 is used for the cavit~
61, 63 of the three remaining filters 6, 8, 10 but is not shown on these remaining filters.
Filters 4, 6, 8, 10 are six-pole elliptic function filters with two pairs of transmission zeros. Each filter 4, 6, 8, 10 is referred to as a channel and coupling aperture 66 of iris 64 provides the necessary coupling for the two pairs of transmission zeros for each channel.
The aperture 5~ is only shown for the filter 4 but exists in the remaining filters 6, 8, 10 as well.
The T-junctions 54 are connected in cascade to form the manifold 66.
In Figure 5(a), there is shown an amplitude response for a prior art four channel multiplexer where each filt~r has three dual mode cavities coupled to a waveguide manifold. In Figure 5(b), there is shown an amplitude response of a four channel multi-plexer constructed in accordance with Figure 1 where each filter has two cavities, one cavity operating in triple mode and the remaining cavity operating in dual mode. It can readily be seen from comparing Figures 5(a) and 5(b) that out-of-band selectivity is improved when a multiplexer is designed in accordance with the present invention. The passband portions of Figures 5(a) and 5(b) are essentially the same. There-fore, the multiplexer of the present invention can achieve a significant weight and vol~me saving over previously known multiplexers with little or no sacrifice in electrical performance in the passband.
In addition, by using asymmetrical response filters for band edge channels in accordance with the present invention, an improved band edge selectivity can be achieved over previously known multiplexers.
While the multiplexer 2 shown in ~igure l has four filters 4, 6, 8, lO with each filter having one triple mode and one dual mode resonator cavity, it will be readily apparent to those skilled in the art that it will be possible to design a multiplexer, within the scope of the attached claims, having any reasonab~e number of filters. Further, it will be possible, within the scope of the attached claims, for the filters to have any reasonable number of triple mode cavities. Some or all of the filters could have only triple mode cavities or the triple mode cavities of any particular filter or filters could be used together with one or more dual mode or one or more single mode cavities. ~here five-pole filters are desired, the preferred arrangement is one dual mode cavity and one triple mode cavity. Where six-pole filters are desired, two triple mode cavities are the preferred arrangement.
~'!';, ,~
Contiguous frequency band multiplexers are known but, in previous multiplexers, dual mode or single mode filters are used. The volume and weight of previous multiplexers is significantly greater than the volume or weight required with the multiplexer in accordance with 10 the present invention in order to produce similar results. Also, the multiplexer of the present invention is able to produce improved passband performance and band edge selectivity over previous multiplexers.
Poor selectivity on a band edge channel filter 15 of previous contiguous band multiplexers has been a long-standing problem in the communications satellite industry.
In accordance with the present invention, a multiplexer has a plurality of bandpass filters coupled 20 through E-plane or H-plane T-junctions to a waveguide manifold. At least one filter has a cavity that resonates in a triple mode when said filters are ./r;~ operated in suitable propagation modes to produc ~ `a~l quasi-elliptic of elliptic function responses. - Y
25 ~r~ each filter has two or more cavities with one of said cavities resonating in a triple mode.
In the following drawings, there are shown embodiments of the present invention:
Figure 1 is a partially exploded perspective 30 view of a four channel contiguous band multiplexer having one cavity in each filter operating in triple mode and the remaining cavity of each filter operating in dual mode;
Figure 2 is a front View of an iris used in 119~S~
the multiplexer;
Figure 3 is a front view of another type of iris used in the multiplexer;
Figure 4 is a ~d~l=~o~ perspective view of a four channel multiplexer where all filters are coupled to E-plane, T-junctions of a manifold;
Figure 5(a) is a graph showing the frequency response of a prior art four channel contiguous ba~d multiplexer having sixth order dual mode quasi-elliptic function filters;
Figure 5(b) is a graph showing the frequency response of a multiplexer constructed in accordance with that shown in Figure 1.
Referring to the drawings in greater detail, in Figure 1 there is shown a multiplexer 2 having four channels or bandpass filters 4, 6, 8, 10, in cascade, coupled to a waveguide manifold 12. Each filter 4, 6, 8, 10 has two cavities 14, 16. Each cavity 14 resonates in triple mode and each cavity 16 resonates in dual mode. Preferably, each cavity 14 resonates in first TElll, second TMolo and third TElll mode while each cavity 16 resonates in first and second TE
mode.
An iris 18 having an aperture 20 is located between the cavities 14, 16 of the filters 4, 10. An iris 22 having an aperture 24 is located between the cavities 14, 16 of the filters 6, 8. The irises 18, 22 proviZe inter-cavity coupling means between the cavities 14, 16 of the particular filters in which they are installed. Then cavity 14 has an input coupling through coaxial probe 17.
Inter-cavity coupling is achieved by means of a physical discontinuity which perturbs the electrical field of one mode to couple energy into another mode.
The cavities 14 have coupling screw 26 and tuning 1~41S7 screws 28, 30. The cavities 14 having coupling screws 32, 34 to provide coupling between the two orthogonal TElll modes. Coupling between the TElll mode and the TEolo mode in cavities 14 is provided by coupling screw 36, 38. Tuning screws 40, 42, 43 provide frequency tuning of the TElll orthogonal mode. Tuning screw 44 provides frequency tuning of the TMolo mode. The same arrangement of tuning screws and coupling screws as that shown for ca~ities 14, lS of filter 4 is the same for the cavities 14, 16 of the three remaining filters 6, 8, 10 but is not shown on these remaining filters.
Filters 4, 10, being the band edge channels, are five-pole quasi-elliptic function filters ~ith three transmission zeros. Filters 6, 8 are five-pole quasi-elliptic function filters with one pair of transmission zeros.
As stated above, inter-cavity coupling between the dual mode cavity 16 and the triple mode cavity 14 of each filter is provided through the apertures shown.
Coupling aperture 20 of iris 18 provided the necessary coupling for the third transmission zero for each of the band edge channels, being filters 4, 10. All four filters 4, 6, 8, 10 are coupled to H-plane, T-~unctions 46 of the waveguide manifold 12 through output couplings provided by aperture 48 located in an end 50 of each cavity 16. The aperture 48 is only shown for the filter 4 but exists in the remaining filters 6, 8, 10 as well. The T-junctions 46 are connected in cascade to form the manifold 12. One end of the manifold 12 is terminated by short circuit plate 52.
r~hile the filters shown in Figure 1 are of fifth order filter function, filters can be designed of any order realized in a cascade of triple mode cavities alone or triple mode cavities along with dual mode ~lg4157 cavities or single mode cavities. For example, in a four channel multiplexer, each filter can have two cavities where each cavity resonates in a triple mode so that each filter is of the sixth order. Also, other forms of asymmetrical filter functions can be used for the improvement of band edge channel selectivity.
In Figure 2, an iris 18 has an aperture 20. The aperture is cruciform in shape and is used in filters 4, 10 as these are the band edge filters and produce an asymmetrical electrical response. In Figure 3, there is shown an iris 22 having an aperture 24 which is a single slot. Filters 6, 8 require the use of coupling iris 22 in order to produce a symmetrical electrical response.
In Figure 4, a multiplexer 2 has filters 4, 6, 8, 10 coupled to E-plane, T-junction 54 of waveguide manifold 56. All four filters 4, 6, 8, 10 are coupled to E-plane, T-junction 54 of the manifold 56 through output coupling provided by aperture 58 located in a side 60 of each cavity 61. The manifold 56 is terminated at one end by a short circuit plate 62.
Each of the filters 4, 6, 8, 10 has two cavities, 61, 63, each cavity resonating in a triple mode.
Preferably, each cavity 61, 63 resonates in a first, TElll, a second TMolo and a third TElll mode. An iris 64 having an aperture 66 is represented by four radially separate and equidistant slots. The iris 64 provides inter-cavity coupling means between the cavities 61, 63 and is located in each of the filters 4, 6, 8, 10, even though it is only shown in the filter 4. Cavity 63 of the filter 4 has an input coupling through coaxial probes 68.
The cavities 61, 63 of each filter 4, 6, 8, 10 :~1941S7 have coupling screws 70, 72 to provide coupling between the two orthogonal TElll and TMolo modes- Tuning screws 74, 76 provide frequency tuning of the first TElll and the third TElll modes. Tuning screw 78 provides frequency tuning of the TMolo mode. The same arrange-ment of tuning screws and coupling screws as that shown for cavities 61, h3 of filter 4 is used for the cavit~
61, 63 of the three remaining filters 6, 8, 10 but is not shown on these remaining filters.
Filters 4, 6, 8, 10 are six-pole elliptic function filters with two pairs of transmission zeros. Each filter 4, 6, 8, 10 is referred to as a channel and coupling aperture 66 of iris 64 provides the necessary coupling for the two pairs of transmission zeros for each channel.
The aperture 5~ is only shown for the filter 4 but exists in the remaining filters 6, 8, 10 as well.
The T-junctions 54 are connected in cascade to form the manifold 66.
In Figure 5(a), there is shown an amplitude response for a prior art four channel multiplexer where each filt~r has three dual mode cavities coupled to a waveguide manifold. In Figure 5(b), there is shown an amplitude response of a four channel multi-plexer constructed in accordance with Figure 1 where each filter has two cavities, one cavity operating in triple mode and the remaining cavity operating in dual mode. It can readily be seen from comparing Figures 5(a) and 5(b) that out-of-band selectivity is improved when a multiplexer is designed in accordance with the present invention. The passband portions of Figures 5(a) and 5(b) are essentially the same. There-fore, the multiplexer of the present invention can achieve a significant weight and vol~me saving over previously known multiplexers with little or no sacrifice in electrical performance in the passband.
In addition, by using asymmetrical response filters for band edge channels in accordance with the present invention, an improved band edge selectivity can be achieved over previously known multiplexers.
While the multiplexer 2 shown in ~igure l has four filters 4, 6, 8, lO with each filter having one triple mode and one dual mode resonator cavity, it will be readily apparent to those skilled in the art that it will be possible to design a multiplexer, within the scope of the attached claims, having any reasonab~e number of filters. Further, it will be possible, within the scope of the attached claims, for the filters to have any reasonable number of triple mode cavities. Some or all of the filters could have only triple mode cavities or the triple mode cavities of any particular filter or filters could be used together with one or more dual mode or one or more single mode cavities. ~here five-pole filters are desired, the preferred arrangement is one dual mode cavity and one triple mode cavity. Where six-pole filters are desired, two triple mode cavities are the preferred arrangement.
~'!';, ,~
Claims (10)
1. A multiplexer comprising a plurality of bandpass filters coupled through E-plane or H-plane T-junctions to a waveguide manifold, at least one filter having a cavity that resonates in a triple mode when said filters are operated in suitable propagation modes to produce quasi-elliptic or elliptic function responses.
2. A multiplexer as claimed in Claim 1 wherein each filter has a cavity that resonates in a triple mode.
3. A multiplexer as claimed in any one of Claims 1 or 2 wherein at least one of the filters is an odd order bandpass filter with an output cavity coupled through T-junctions in dual mode.
4. A multiplexer as claimed in any one of Claims 1 or 2 wherein there is at least one bandpass filter of the order N, where N is an integer multiple of three and said filter has an output cavity coupled through a T-junction in triple mode.
5. A multiplexer as claimed in any one of Claims 1 or 2 wherein at least one filter has an output cavity coupled to an-E-plane or H-plane-T-junction in dual mode through an iris located at an end of said output cavity.
6. A multiplexer as claimed in any one of Claims 1 or 2 wherein at least one filter has an output cavity coupled to an E-plane T-junction in a triple mode through an iris located at a side of said output cavity.
7. A multiplexer as claimed in Claim 2 wherein each filter has two cavities, with the cavity coupled through the E-plane or H-plane T-junction resonating in a dual mode.
8. A multiplexer as claimed in Claim 2 wherein each filter has two cavities resonating in a triple mode.
9. A multiplexer as claimed in any one of Claims 7 or 8 wherein there are four filters.
10. A multiplexer as claimed in Claim 2 wherein band edge channel filters are operated to realize an asymmetrical filter function response.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000455284A CA1194157A (en) | 1984-05-28 | 1984-05-28 | Waveguide manifold coupled multiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000455284A CA1194157A (en) | 1984-05-28 | 1984-05-28 | Waveguide manifold coupled multiplexer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1194157A true CA1194157A (en) | 1985-09-24 |
Family
ID=4127955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000455284A Expired CA1194157A (en) | 1984-05-28 | 1984-05-28 | Waveguide manifold coupled multiplexer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1194157A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4792771A (en) * | 1986-02-21 | 1988-12-20 | Com Dev Ltd. | Quadruple mode filter |
| US9325046B2 (en) | 2012-10-25 | 2016-04-26 | Mesaplexx Pty Ltd | Multi-mode filter |
| US9401537B2 (en) | 2011-08-23 | 2016-07-26 | Mesaplexx Pty Ltd. | Multi-mode filter |
| US9406988B2 (en) | 2011-08-23 | 2016-08-02 | Mesaplexx Pty Ltd | Multi-mode filter |
| US9614264B2 (en) | 2013-12-19 | 2017-04-04 | Mesaplexxpty Ltd | Filter |
| GB2543915A (en) * | 2015-09-08 | 2017-05-03 | Isotek Microwave Ltd | A microwave switched multiplexer and a mobile telecommunications device including such a multiplexer |
| US9843083B2 (en) | 2012-10-09 | 2017-12-12 | Mesaplexx Pty Ltd | Multi-mode filter having a dielectric resonator mounted on a carrier and surrounded by a trench |
| CN115313004A (en) * | 2022-07-29 | 2022-11-08 | 西安空间无线电技术研究所 | A multiple-input multiple-output cavity output multiplexer and design method |
-
1984
- 1984-05-28 CA CA000455284A patent/CA1194157A/en not_active Expired
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4792771A (en) * | 1986-02-21 | 1988-12-20 | Com Dev Ltd. | Quadruple mode filter |
| US9698455B2 (en) | 2011-08-23 | 2017-07-04 | Mesaplex Pty Ltd. | Multi-mode filter having at least one feed line and a phase array of coupling elements |
| US9401537B2 (en) | 2011-08-23 | 2016-07-26 | Mesaplexx Pty Ltd. | Multi-mode filter |
| US9406988B2 (en) | 2011-08-23 | 2016-08-02 | Mesaplexx Pty Ltd | Multi-mode filter |
| US9406993B2 (en) | 2011-08-23 | 2016-08-02 | Mesaplexx Pty Ltd | Filter |
| US9437910B2 (en) | 2011-08-23 | 2016-09-06 | Mesaplexx Pty Ltd | Multi-mode filter |
| US9437916B2 (en) | 2011-08-23 | 2016-09-06 | Mesaplexx Pty Ltd | Filter |
| US9559398B2 (en) | 2011-08-23 | 2017-01-31 | Mesaplex Pty Ltd. | Multi-mode filter |
| US9843083B2 (en) | 2012-10-09 | 2017-12-12 | Mesaplexx Pty Ltd | Multi-mode filter having a dielectric resonator mounted on a carrier and surrounded by a trench |
| US9325046B2 (en) | 2012-10-25 | 2016-04-26 | Mesaplexx Pty Ltd | Multi-mode filter |
| US9614264B2 (en) | 2013-12-19 | 2017-04-04 | Mesaplexxpty Ltd | Filter |
| GB2543915A (en) * | 2015-09-08 | 2017-05-03 | Isotek Microwave Ltd | A microwave switched multiplexer and a mobile telecommunications device including such a multiplexer |
| US10804941B2 (en) | 2015-09-08 | 2020-10-13 | Isotek Microwave Limited | Microwave switched multiplexer and a mobile telecommunications device including such a multiplexer |
| US10819376B2 (en) | 2015-09-08 | 2020-10-27 | Isotek Microwave Limited | Microwave switched multiplexer and a mobile telecommunications device including such a multiplexer |
| GB2543915B (en) * | 2015-09-08 | 2021-06-09 | Isotek Microwave Ltd | A microwave switched multiplexer and a mobile telecommunications device including such a multiplexer |
| CN115313004A (en) * | 2022-07-29 | 2022-11-08 | 西安空间无线电技术研究所 | A multiple-input multiple-output cavity output multiplexer and design method |
| CN115313004B (en) * | 2022-07-29 | 2023-08-29 | 西安空间无线电技术研究所 | A multi-input multi-output cavity output multiplexer and design method |
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