EP3718165A1 - High frequency selectivity filter for microwave signals - Google Patents
High frequency selectivity filter for microwave signalsInfo
- Publication number
- EP3718165A1 EP3718165A1 EP18826107.7A EP18826107A EP3718165A1 EP 3718165 A1 EP3718165 A1 EP 3718165A1 EP 18826107 A EP18826107 A EP 18826107A EP 3718165 A1 EP3718165 A1 EP 3718165A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rectangular waveguide
- transversal
- plane
- coupling
- resonator
- 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.)
- Granted
Links
- 238000010168 coupling process Methods 0.000 claims abstract description 133
- 238000005859 coupling reaction Methods 0.000 claims abstract description 133
- 230000008878 coupling Effects 0.000 claims abstract description 132
- 238000005516 engineering process Methods 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims description 12
- 230000004044 response Effects 0.000 description 16
- 238000013461 design Methods 0.000 description 13
- 230000001939 inductive effect Effects 0.000 description 8
- 210000000554 iris Anatomy 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- KMGARVOVYXNAOF-UHFFFAOYSA-N benzpiperylone Chemical compound C1CN(C)CCC1N1C(=O)C(CC=2C=CC=CC=2)=C(C=2C=CC=CC=2)N1 KMGARVOVYXNAOF-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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
Definitions
- the present invention relates, in general, to a microwave filter and, more particularly, to a high frequency selectivity filter for microwave signals, such as those used in uplink and downlink satellite transmissions.
- downlink channels need to be efficiently combined (multiplexed) into a high-power composite output microwave signal, which is then fed into a satellite antenna system for downlink transmission.
- Multiplexers and demultiplexers currently used in satellite transponders typically include waveguide filters, which may be coupled in different ways depending on specific requirements.
- Each waveguide filter is generally dedicated to separation of signal frequencies associated with a respective uplink/downlink channel.
- the bandwidth of a typical transponder channel is a small percentage of the central operating frequency and is in close proximity with the adjacent channels .
- the filters must meet stringent requirements in terms of frequency selectivity in order to avoid adjacent channel interference.
- the filter design must exploit a circuit topology that permits the allocation of transmission zeros in the proximity of the lower and the upper edges of the pass-band.
- the filter topology and the number of resonators are determined to ensure the compliance with given requirements.
- the first design step typically includes defining an ideal circuit that comprises ideal resonators coupled by impedance inverters .
- FIG. 1 schematically illustrates an example of ideal symmetric folded circuit of order six (in Figure 1 denoted as a whole by 1 and hereinafter referred to as "symmetric folded circuit 1") .
- the symmetric folded circuit 1 includes :
- Each first ideal resonator 11 is transversally coupled to a respective second ideal resonator 12 by means of a respective transversal coupling (in particular, a respective impedance inverter represented in Figure 1 as a respective dotted-line segment) .
- a respective transversal coupling in particular, a respective impedance inverter represented in Figure 1 as a respective dotted-line segment
- the symmetric folded circuit 1 allows the allocation of four transmission zeros that are symmetrically placed below and above the pass-band.
- the impedance inverters are characterized by transversal coupling values/coefficients that can be positive or negative.
- the frequency response of the symmetric folded circuit 1 is uniquely defined by the values of all the coupling coefficients (i.e., line and transversal coupling coefficients) and by the values of the resonance frequencies associated with all the resonators 11 and 12. With proper values of these design parameters, the symmetric folded circuit 1 can provide the selective frequency response shown in Figure 2 (which is centered at 41 GHz) .
- ideal symmetric folded circuits of lower/higher orders can be defined by reducing/extending the structure of order six shown in Figure 1.
- the second step of the modern filter design includes the definition and the optimization of a waveguide structure such that to approximate the electrical response of the ideal circuit.
- This second design step is rendered hard by the fact that a waveguide structure is made up of distributed elements, which behave differently than the lumped elements used in an ideal circuit. Nevertheless, with a proper selection of the waveguide structure, the two responses can be very close over a wide frequency range that covers the pass-band of interest.
- hybrid folded rectangular waveguide filter is provided in US 2016/240905 Al, which discloses a group of rectangular waveguide resonators including first and second resonators that are arranged so that first lateral walls of the first resonator extend in parallel to second lateral walls of the second resonator.
- the first lateral walls correspond to broad sides of a first cross section of the first resonator perpendicular to a guide direction of the first resonator.
- the second lateral walls correspond to broad sides of a second cross section of the second resonator perpendicular to a guide direction of the second resonator.
- the first and second resonators are further arranged so that one of the first lateral walls at least partially faces one of the second lateral walls, and the first resonator is electromagnetically coupled to the second resonator through a first aperture in the one of the first lateral walls and a second aperture in the one of the second lateral walls.
- the single-mode filters in rectangular waveguide may present some advantages in term of a lower manufacturing complexity and a reduced number of mechanical parts.
- the coupling coefficients with different signs are obtained using inductive and capacitive couplings in the form of irises/windows. Inductive windows are easy to manufacture and can provide a wide range of couplings.
- capacitive irises provide really strong couplings with small gaps, since the iris itself is a section of the propagation rectangular waveguide.
- capacitive irises do not represent the best solution for the implementation of small couplings coefficients because the corresponding slot would be difficult to make due to its small size. This problem is exacerbated at high frequencies and for filters characterized by a narrow pass-band, because the amplitudes of the transversal coupling coefficients become smaller as the bandwidth decreases.
- an object of the present invention is that of providing a microwave filter with enhanced frequency selectivity capabilities and with a more compact structure with respect to those of the currently known solutions.
- Figure 1 schematically illustrates an ideal symmetric folded circuit of order six
- Figure 2 shows an example of frequency response of the ideal symmetric folded circuit of order six shown in Figure 1;
- Figure 3 shows a single-mode filter in rectangular waveguide technology according to a preferred, non-limiting embodiment of the present invention
- Figures 4 and 5 show the magnetic field in two couples of resonator cavities coupled, respectively, through a pair of slots ( Figure 4) and through a single slot (Figure 5) in the single-mode filter in rectangular waveguide technology shown in Figure 3;
- Figure 6 shows a simulated frequency response of the single-mode filter in rectangular waveguide technology shown in Figure 3.
- Figure 7 shows an assembly of three parts forming the single-mode filter of Figure 3 according to a preferred, non-limiting mode of carrying out the present invention .
- a first folded circuit including a plurality of first rectangular waveguide resonators connected in cascade by means of first line couplings in rectangular waveguide technology;
- a second folded circuit including a plurality of second rectangular waveguide resonators connected in cascade by means of second line couplings in rectangular waveguide technology.
- the first and second folded circuits are designed for operating with a TE10N resonant mode and are transversally coupled on a coupling plane that is perpendicular to a transversal plane crossing all the first and second rectangular waveguide resonators.
- Each first rectangular waveguide resonator is:
- a respective negative transversal coupling including a respective pair of slots made through said respective metal/metallized wall and symmetrically spaced apart from the transversal plane by a predefined distance.
- each of the first and second rectangular waveguide resonators transversally coupled by means of the respective single slot is crossed by the transversal plane at a respective resonator section where magnetic field component coupled by said respective single slot is maximum.
- each of the first and second rectangular waveguide resonators transversally coupled by means of the respective pair of slots is crossed by the transversal plane at a respective resonator section where magnetic field component coupled by said respective pair of slots is null.
- the first and second folded circuits are symmetrical with respect to a rotation of 180 degrees around a symmetry axis defined by an intersection of the transversal and coupling planes (and, hence, lying on both said transversal and coupling planes) .
- microwave filter The following are preferred features of the microwave filter :
- the first folded circuit is symmetrical with respect to a first plane of symmetry parallel to the coupling plane;
- the second folded circuit is symmetrical with respect to a second plane of symmetry parallel to the first plane of symmetry and to the coupling plane;
- each first rectangular waveguide resonator includes a respective first rectangular waveguide resonant cavity
- each second rectangular waveguide resonator includes a respective second rectangular waveguide resonant cavity
- the first line couplings include first curved rectangular waveguide lines connecting in cascade the first rectangular waveguide resonant cavities;
- the second line couplings include second curved rectangular waveguide lines connecting in cascade the second rectangular waveguide resonant cavities.
- the first and second curved rectangular waveguide lines have smaller height than the first and second rectangular waveguide resonant cavities, whereby said first and second curved rectangular waveguide lines have smaller characteristic impedance than said first and second rectangular waveguide resonant cavities.
- the microwave filter is split up, at the first and second planes of symmetry, into three parts that comprise :
- a third part including a second symmetrical half of the second folded circuit, wherein said first, second and third parts are designed to be stacked on one another to form the microwave filter.
- Figure 3 shows a single-mode filter (denoted as a whole by 2) in rectangular waveguide technology according to a preferred, non-limiting embodiment of the present invention.
- the single-mode filter 2 represents a preferred mode for carrying out the ideal symmetric folded circuit 1 of order six (with four transmission zeros allocated in the proximity of the pass- band edges) shown in Figure 1 and previously described.
- the single-mode filter 2 includes:
- first and second folded circuits 21 and 22 are shown spaced apart from each other only for the sake of a better understanding of their structures (conveniently, their S-shaped structures) . Nevertheless, actually, said first and second folded circuits 21 and 22 are transversally coupled to each other on a coupling plane Pc that is parallel to, and equidistant from, the first and second planes of symmetry P si and P s 2 .
- the first and second folded circuits 21 and 22 are designed for operating with a TE10N resonant mode.
- the first folded circuit 21 comprises:
- a first rectangular waveguide resonator (or resonant cavity) 211 that is crossed (orthogonally to first folded circuit's path) by a transversal plane PT at a respective transversal waveguide section where (i.e., at which) the longitudinal magnetic field component is maximum (condition for positive transversal couplings); wherein said transversal plane PT is perpendicular to the first and second planes of symmetry P si and P s 2 , and to the coupling plane P c ;
- a second rectangular waveguide resonator (or resonant cavity) 212 that is crossed (orthogonally to the first folded circuit's path) by the transversal plane PT at a respective transversal waveguide section where (i.e., at which) the longitudinal magnetic field component is null (condition for negative transversal couplings);
- the first, second and third rectangular waveguide resonators 211, 212 and 213 are connected in cascade by means of first line couplings in rectangular waveguide technology, in particular:
- the second folded circuit 22 comprises a fourth rectangular waveguide resonator (or resonant cavity) 221, a fifth rectangular waveguide resonator (or resonant cavity) 222 and a sixth rectangular waveguide resonator (or resonant cavity) 223.
- the fourth rectangular waveguide resonator 221 is crossed (orthogonally to second folded circuit's path) by the transversal plane PT at a respective transversal waveguide section where (i.e., at which) the longitudinal magnetic field component is maximum (condition for positive transversal couplings) .
- the fifth rectangular waveguide resonator 222 is crossed (orthogonally to the second folded circuit's path) by the transversal plane PT at a respective transversal waveguide section where (i.e., at which) the longitudinal magnetic field component is null (condition for negative transversal couplings) .
- the sixth rectangular waveguide resonator 223 is crossed (orthogonally to the second folded circuit's path) by the transversal plane PT at a respective transversal waveguide section where (i.e., at which) the longitudinal magnetic field component is maximum (condition for positive transversal couplings) .
- the fourth, fifth and sixth rectangular waveguide resonators 221, 222 and 223 are connected in cascade by means of second line couplings in rectangular waveguide technology, in particular:
- the first, second, third and fourth rectangular waveguide lines 214, 215, 224 and 225 have a first height that is smaller than a second height of the first, second, third, fourth, fifth and sixth rectangular waveguide resonant cavities 211, 212, 213, 221, 222 and 223, thereby resulting in a first characteristic impedance associated with the rectangular waveguide lines 214, 215, 224 and 225 that is smaller than a second characteristic impedance associated with the rectangular waveguide resonant cavities 211, 212, 213, 221, 222 and 223.
- the values of the line coupling coefficients may be conveniently controlled by properly tuning the characteristic impedances (waveguide heights) associated with the line coupling waveguides with respect to those of the resonant waveguides.
- the lengths of the line coupling waveguides may be advantageously optimized to minimize the frequency spreading (i.e., the variations in frequency domain) of the line coupling coefficients over the operating frequency band.
- the first and second folded circuits 21 and 22 include also, each, a respective rectangular waveguide input/output port 216,226 connected to, respectively, the first/fourth rectangular waveguide resonator 211,221.
- the first and second folded circuits 21 and 22 are symmetrical with respect to a rotation of 180 degrees around a symmetry axis As defined by the intersection of the transversal and coupling planes PT and Pc and, hence, lying on both said transversal and coupling planes PT and Pc.
- Said first and second folded circuits 21 and 22 are transversally coupled by means of transversal coupling slots (or apertures) lying on the coupling plane Pc, in particular :
- transversal coupling slots 23, 24 and 25 can be conveniently made in the form of apertures on the metallic wall(s) separating, respectively, the first 211 and fourth 221, the second 212 and fifth 222, and the third 213 and sixth 223 rectangular waveguide resonators.
- the alternating signs of the transversal coupling coefficients are due to the geometrical arrangement of the two folded circuits 21 and 22 and to the special symmetry of the overall structure, which is invariant after a rotation of 180 degrees around the symmetry axis As.
- This structure makes it possible the realization of different coupling signs using only one kind of iris, which can be advantageously selected for the best manufacturability and for the best agreement of its frequency response with the ideal coupling.
- the aspect ratio of the transversal coupling slots 23, 24 and 25 may be advantageously selected for the best manufacturability and for a minimum frequency spreading of the transversal coupling coefficients.
- the values of the transversal coupling coefficients may be conveniently controlled by properly tuning the size of the transversal coupling slots 23, 24 and 25.
- the path lengths of the first and second folded circuits 21 and 22 are such that to achieve alignment of resonators fields with respect to the transversal plane PT.
- the longitudinal magnetic field component of the resonant mode TE10N (i.e., the magnetic field component coupled by the transversal coupling slots 23, 24 and 25) is :
- Figures 4 and 5 show examples of magnetic field lines in, respectively, • the second rectangular waveguide resonator 212 and the fifth rectangular waveguide resonator 222 subject to the negative transversal coupling via the second transversal coupling slots 24, and
- the longitudinal magnetic field component is null on said transversal plane PT.
- the coupled magnetic field component (i.e., the longitudinal one) oscillates with a sinusoidal shape along the longitudinal direction (i.e., along the waveguide path represented by z axis in Figure 4) .
- the coupled magnetic field component achieves a couple of maximum absolute values, with opposite signs, at the centers of the two second transversal coupling slots 24, which, as previously said, are spaced apart from the transversal plane P T by a quarter of the guide wavelength (i.e., A g /4) along the longitudinal direction (i.e., along the z axis) .
- the resonant field associated with each rectangular waveguide resonant cavity 211,212,213,221,222,223 is the TE10N mode.
- the first index of "TE10N" i.e., 1 is related to a direction (y axis in Figures 3-5) that is orthogonal to the coupling plane Pc and is associated with waveguide width.
- the second index i.e., 0 is related to a direction (x axis in Figures 3-5) that is parallel to the coupling plane Pc and is associated with waveguide height.
- the last index i.e., N
- N is related to the longitudinal direction (z axis in Figures 3-5) parallel to (i.e.
- the first, second and third transversal coupling slots 23, 24 and 25 located on the coupling plane Pc establish a coupling between the longitudinal magnetic field components of the TE10N modes associated with adjacent resonators.
- the longitudinal component is the only magnetic field component that is non-null on the coupling plane Pc and, hence, is the magnetic field component coupled by the transversal coupling slots 23, 24 and 25.
- the present invention might be conveniently carried out also with other technologies based on TEM mode (such as stripline or coaxial technology) .
- the transversal coupling slots would couple the transversal magnetic field component, which would be the only non-null magnetic field component on the coupling plane Pc. Therefore, in this case, the transversal magnetic field component would be:
- the magnetic field component coupled by the transversal coupling slots (e.g., the longitudinal one for TElON-based solutions, or the transversal one for TEM-base solutions) is :
- the electrical response of the single-mode filter 2 is in a very good agreement with the ideal response over a wide frequency region, as it is demonstrated by a comparison between a simulated frequency response of the single-mode filter 2 shown in Figure 6 and the corresponding ideal one shown in Figure 2.
- the configuration of the single-mode filter 2 is compatible with a clam-shell-like (or, equivalently, sandwich-like) realization (conveniently, by using a manufacturing process based on milling machines), wherein the single mode-filter 2 is split up into three parts at the first and second planes of symmetry Psi and PS2.
- the single mode- filter 2 may be conveniently split up into:
- a top part 201 including a first symmetrical half of the first folded circuit 21
- a middle part 202 including, on opposite sides (respectively, top and bottom sides thereof) , the second symmetrical half of the first folded circuit 21 and a first symmetrical half of the second folded circuit 22;
- This kind of splitting introduces a negligible degradation of the insertion loss because the electric currents associated with the TE10N resonant mode of a rectangular waveguide are null across the first and second planes of symmetry Psi and Ps 2 .
- the symmetry of the first and second folded circuits 21 and 22 is only approximate because of the presence of the transversal coupling slots 23, 24 and 25.
- said transversal coupling slots 23, 24 and 25 are quite small in comparison with the waveguide size and, in use, generate a small perturbation of the field distribution in proximity of the first and second planes of symmetry Psi and Ps 2 .
- the electric currents across said first and second planes of symmetry Psi and Ps 2 are, thence, not exactly null (as it would be in case of a perfect symmetry), but are anyway small.
- Each of the three parts 201,202,203 is substantially a planar structure and does not present any discontinuity in the normal (out of plane) direction, except for the transversal coupling slots 23, 24 and 25. This kind of structure can be easily manufactured using a milling machine .
- the clam-shell (or, equivalently, sandwich-like) realization as an assembly of three parts and the use of milling machines permits a substantial cost reduction with respect to a canonical dual-mode filter configuration, which must be manufactured as an assembly of a higher number of parts (typically, at least one part for each resonant cavity) .
- This advantage becomes more evident with the increasing of the filter order and of the number of resonant cavities.
- first and second folded circuits 21 and 22 might be conveniently based on technologies different than the rectangular waveguide one, by maintaining the same symmetry features and the same geometrical features taught by the present invention about the overall filter structure and the transversal couplings.
- first and second folded circuits 21 and 22 might be conveniently based also on square coaxial technology, microstrip technology, stripline technology, etc .
- the first and second folded circuits may be conveniently based on rectangular waveguide technology, or also on a different technology (such as square coaxial, microstrip or stripline technology) , wherein each resonator is :
- a respective wall lying on the coupling plane a metal or metallized wall, such as a metal thick wall in case of rectangular-waveguide-based filter, or a thin metallization for a planar multilayer structure, e.g., based on microstrip or stripline technology
- a metal or metallized wall such as a metal thick wall in case of rectangular-waveguide-based filter, or a thin metallization for a planar multilayer structure, e.g., based on microstrip or stripline technology
- transversally coupled to said respective resonator by means of - a respective positive transversal coupling including a respective single slot made through said respective wall at the transversal plane (conveniently, centered with respect to the transversal plane) , or
- a respective negative transversal coupling including a respective pair of slots made through said respective wall in proximity of the transversal plane (conveniently, symmetrically spaced apart from the transversal plane by a predefined distance (preferably, that is quarter of the wavelength in waveguide at the central frequency, i.e., the guide wavelength X g) ) .
- the first and second folded circuits might have a non-prefect symmetry with respect to a rotation of 180 degrees around the symmetry axis As, or even not have any symmetry with respect to said axis.
- the present invention allows to design microwave filters operating at high frequencies with a narrow pass-band, a high frequency selectivity, the allocation of multiple transmission zeros, and a good agreement of filters' electrical response with respect to the ideal one.
- the present invention can be advantageously exploited in satellite multiplexers/demultiplexers and, more in general, for the design of microwave filters characterized by a high frequency selectivity.
- the present invention allows to achieve the aforesaid technical advantages by means of single-mode microwave filters of the symmetric folded resonator circuit type characterized by a simple, symmetry-driven mechanism for the implementation of transversal-couplings with mixed signs .
- the present invention provides a new technique for the realization of the transversal couplings with alternating signs.
- different transversal coupling signs are obtained by a exploiting the symmetry of the structure and a special arrangement of the waveguide layouts. It is then possible to use inductive windows for all the transversal couplings allowing an easier manufacturability than previous designs of single-mode filters in rectangular waveguide.
- the single-mode filter according to the present invention is well suited for a clam-shell-like (or sandwich-like) realization and can be manufactured by means of milling machines in a smaller number of parts and with a cost saving with respect to the canonical dual-mode filter configuration .
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT201700137455 | 2017-11-29 | ||
PCT/IB2018/059458 WO2019106596A1 (en) | 2017-11-29 | 2018-11-29 | High frequency selectivity filter for microwave signals |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3718165A1 true EP3718165A1 (en) | 2020-10-07 |
EP3718165B1 EP3718165B1 (en) | 2022-01-05 |
Family
ID=61257059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18826107.7A Active EP3718165B1 (en) | 2017-11-29 | 2018-11-29 | High frequency selectivity filter for microwave signals |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3718165B1 (en) |
WO (1) | WO2019106596A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114279478B (en) * | 2021-12-24 | 2024-05-24 | 杭州电子科技大学 | Microwave sensor based on non-hermeticity notch structure |
CN115051133B (en) * | 2022-07-19 | 2023-11-17 | 北京星英联微波科技有限责任公司 | Waveguide broadside broadband coupling bridge |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10050321B2 (en) * | 2011-12-03 | 2018-08-14 | Cts Corporation | Dielectric waveguide filter with direct coupling and alternative cross-coupling |
US20160240905A1 (en) | 2013-10-25 | 2016-08-18 | European Space Agency | Hybrid folded rectangular waveguide filter |
-
2018
- 2018-11-29 EP EP18826107.7A patent/EP3718165B1/en active Active
- 2018-11-29 WO PCT/IB2018/059458 patent/WO2019106596A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2019106596A1 (en) | 2019-06-06 |
EP3718165B1 (en) | 2022-01-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7877855B2 (en) | Method of forming vertical coupling structure for non-adjacent resonators | |
US6496087B1 (en) | Multi-mode dielectric resonance devices, dielectric filter, composite dielectric filter, synthesizer, distributor, and communication equipment | |
US11239537B2 (en) | Microwave resonator, a microwave filter and a microwave multiplexer | |
CN109742493B (en) | Differential dual-passband filter based on four-mode dielectric resonator | |
KR20200062005A (en) | Ceramic Waveguide Filter and Manufacturing Method Thereof | |
KR20200062006A (en) | Ceramic Waveguide Filter and Manufacturing Method Thereof | |
EP3718165B1 (en) | High frequency selectivity filter for microwave signals | |
US11509031B2 (en) | Substrate-integrated waveguide filtering crossover having a dual mode rectangular cavity coupled to eight single mode square cavities | |
KR19990082833A (en) | Dielectric Resonator Device | |
Tang et al. | Development of substrate integrated waveguide filters for low-cost high-density RF and microwave circuit integration: pseudo-elliptic dual mode cavity band-pass filters | |
JPH10173407A (en) | Waveguide-form demultiplexer and manufacture thereof | |
CN110429364B (en) | Filter and filtering loop structure thereof | |
Lee et al. | Two-layered cross-coupled post-loaded SIW filter with microstrip ports | |
US20160240905A1 (en) | Hybrid folded rectangular waveguide filter | |
US11139547B2 (en) | Tunable bandpass filter and method of forming the same | |
JPH11312903A (en) | Dielectric filter, dielectric duplexer and communication equipment | |
JP3589008B2 (en) | Dielectric resonator, filter using the same, duplexer, and communication device | |
US6194981B1 (en) | Slot line band reject filter | |
US6023206A (en) | Slot line band pass filter | |
KR20220057445A (en) | Ceramic waveguide filter for antenna | |
US10651524B2 (en) | Planar orthomode transducer | |
EP1581980B1 (en) | Waveguide e-plane rf bandpass filter with pseudo-elliptic response | |
CN112768858A (en) | Dielectric waveguide resonator and combiner comprising same | |
EP0869573B1 (en) | Dielectric filter and communication apparatus using same | |
JP4442066B2 (en) | Dual-mode bandpass filter, characteristic adjustment method for dual-mode bandpass filter, duplexer, and wireless communication apparatus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20200508 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20210726 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 1461393 Country of ref document: AT Kind code of ref document: T Effective date: 20220115 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602018029308 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: FP |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG9D |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1461393 Country of ref document: AT Kind code of ref document: T Effective date: 20220105 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220505 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220405 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220405 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220406 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220505 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602018029308 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 |
|
26N | No opposition filed |
Effective date: 20221006 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230518 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: BE Ref legal event code: MM Effective date: 20221130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20221130 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20221130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20221129 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20221129 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20221130 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20231124 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20231121 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20231108 Year of fee payment: 6 Ref country code: FR Payment date: 20231123 Year of fee payment: 6 Ref country code: DE Payment date: 20231127 Year of fee payment: 6 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO Effective date: 20181129 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20220105 |