GB2567962A - Resonator apparatus and method of use thereof - Google Patents
Resonator apparatus and method of use thereof Download PDFInfo
- Publication number
- GB2567962A GB2567962A GB1816510.0A GB201816510A GB2567962A GB 2567962 A GB2567962 A GB 2567962A GB 201816510 A GB201816510 A GB 201816510A GB 2567962 A GB2567962 A GB 2567962A
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- GB
- United Kingdom
- Prior art keywords
- frequencies
- resonator apparatus
- resonator
- frequency
- resonating means
- 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.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
- H01P7/105—Multimode resonators
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- 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
-
- 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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
- H01P1/2086—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators multimode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/082—Microstripline resonators
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Abstract
A resonator apparatus for use in radio frequency filter apparatus comprises resonating means 112 creating or supporting at least two resonant modes, arranged such that at least two transmission zeroes are created by said apparatus without the need for any cross couplings between the resonant modes. Aspects include an input coupling 114 for allowing one or more Electromagnetic waves to enter into the resonator apparatus, and an output coupling 116 for allowing one or more Electromagnetic waves to leave the resonator. The input and output couplings are arranged such that the at least two transmission zeros are provided at finite frequencies. The resonating means may be in the form of a layer or coating or electrically conductive material provided on a dielectric material or substrate, ceramic and/or printed circuit board (PCB); any or any combination of a solid object, a symmetrical object, an asymmetrical object, annular disk, formed from, including, coated with or at least partially covered in an electrically conductive material; is formed from an electrically conductive material including any or any combination of one or more transmission lines, metals, strip lines, slab lines or microstrip; and/or is formed from a dielectric material, ceramic or a ceramic puck.
Description
Resonator Apparatus and Method of Use Thereof
This invention relates to resonator or filter apparatus and to a method of use thereof. It also relates to resonator apparatus for use in filter apparatus, and a method of using resonator apparatus.
Filter apparatus is typically used in telecommunication systems to compensate for disturbances, such as interference, that may affect one or more radio frequency (RF) signals being sent and/or received by the telecommunication system. The filter apparatus is designed to remove unwanted components from the transmit and/or receive signals and/or enhance the desired transmit and/or receive signals.
An example of conventional RF or microwave filter apparatus typically includes a conductive housing defining one or mote resonant cavities therein, with one or more resonators located in each cavity. A resonator is an electronic component that exhibits resonance for a narrow range of frequencies. Two or more resonators within the filter are typically electromagnetically coupled together to provide the filter with a required set of performance characteristics.
An example of conventional resonator apparatus 2 for use in an RF filter is shown in figure 1. The apparatus 2 comprises a cavity 4 in which a combline resonator 6 is provided. Resonator 6 is a single mode resonator and is an industry standard for use in cellular radios. Problems with the use of this type of resonator apparatus is that the resulting filter is relatively large in size and is expensive to produce.
Filters in cellular radios are required to meet difficult specifications including both passband low loss and high stop band attenuation. Figure 2 shows a typical filter topology 8 used in such high performance filters. The topology 8 comprises a plurality of resonators 10 provided between an input port 12 and an output port
14. The resonators 10 are coupled together via mainline couplings 16, and cross couplings 18 to produce transmission zeros. The industry standard is to realise such filters using combline resonators, as shown in figure 1. Attempts have been made to reduce the size of the filters using multimode resonators but a problem with this type of apparatus is that it is difficult to produce and control all the couplings necessary for a high performance filter.
It is therefore an aim of the present invention to provide filter apparatus that overcomes the abovementioned problems.
It is a further aim of the present invention to provide resonator apparatus for use in filter apparatus that overcomes the abovementioned problems.
It is a yet further aim of the present invention to provide a telecommunications system including filter apparatus.
It is a yet further aim of the present invention to provide a method of using and/or assembling filter apparatus, resonator apparatus and/or a telecommunications system.
According to a first aspect of the present invention there is provided resonator apparatus for use in radio frequency filter apparatus, said resonator apparatus comprising resonating means creating or supporting at least two resonant modes, and wherein said resonator apparatus is arranged such that at least two transmission zeroes are created by said apparatus without the need for any cross couplings between the resonant modes.
By creating resonator apparatus that has at least two transmission zeroes without cross couplings, this greatly reduces the size of the resonator apparatus and the costs associated in producing the same.
Preferably the resonator apparatus includes an input coupling and an output coupling.
Preferably the input coupling is a coupling that allows the input of one or more electromagnetic waves into the resonator apparatus in use.
Preferably the output coupling is a coupling that allows the output of one or more electromagnetic waves from the resonator apparatus in use.
Preferably the at least two resonant modes are at the same or substantially the same resonant frequency or frequency range.
Preferably the input and output couplings are arranged such that the at least two transmission zeroes are provided at finite frequencies.
Preferably the resonating means are arranged such that electromagnetic waves can propagate around the resonating means in opposing directions to create the at least two resonant modes.
Preferably the input and output couplings are arranged such that the sum of the electromagnetic waves travelling or propagating in opposing directions around the resonating means can be added together to create a second order passband at a first frequency or first set of frequencies, and the sum of the electromagnetic waves travelling or propagating in opposing directions cancel out to create at least two transmission zeroes at a second frequency or second set of frequencies and at least a third frequency or third set of frequencies.
Preferably the first, second and at least third frequencies or sets of frequencies are different or substantially different.
In one embodiment the second and at least third frequencies or sets of frequencies are lower in frequency than the passband of the first frequency or first set of frequencies.
In one embodiment the second and at least third frequencies or sets of frequencies are higher than the passband of the first frequency or first set of frequencies, but they are lower than the re-resonances of the resonating means though.
In one embodiment one of the second and at least third frequencies or sets of frequencies are higher than the passband of the first frequency or first set of frequencies, and the other of the second and at least third frequencies or sets of frequencies are lower than the passband of the first frequency or first set of frequencies.
Preferably the input coupling and output coupling are arranged to be at an angle of approximately 80-110 degrees to each other, and further preferably to be at 90 or substantially 90 degrees to each other.
Preferably one or more dimensions, length, width, thickness, height relative to the resonating means, type of coupling and/or the like of the input coupling and/or the output coupling can be adjusted to adjust the first, second and at least third frequencies or sets of frequencies and/or the frequency of the transmission zeroes.
In one embodiment the wave impedance of the waves propagating or travelling in opposing directions is the same.
In one embodiment the wave impedance of the waves propagating or travelling in opposing directions is different.
Preferably adjustment of the wave impedance in either direction can be used to adjust the frequencies of the transmission zeroes.
In one embodiment the resonating means consists of a single resonator within a cavity of a housing (i.e. it is a single electronic component that exhibits resonance for a narrow range of frequencies).
In one embodiment the resonating means is in the form of a resonator, and/or consists of or is in the form of at least one layer or coating of electrically conductive material provided on a dielectric material or substrate.
Preferably the dielectric material or substrate can be any or any combination of ceramic, printed circuit board (PCB) and/or the like.
Preferably the at least one layer or coating of electrically conductive material is formed so as to allow electromagnetic waves to propagate or travel in opposing directions around the at least one layer or coating.
In one embodiment the resonating means is located or suspended within a space or cavity of a housing or unit, such as for example a space or cavity defined in a filter apparatus.
Preferably the resonating means ate suspended within the space or cavity via suspension means.
Preferably the suspension means includes any or any combination of one or more suspension members, support members, clips, bracket members, rods, pins and/or the like.
In one embodiment the resonating means are suspended via a member forming at least part of or consisting of the input coupling and/or a member forming at least part of or consisting of the output coupling.
In one embodiment the resonating means can be any or any combination of a solid object, an annular object, a regular shaped object, an irregular shaped object, a symmetrical object, an asymmetrical object and/or the like, formed from, including, coated with or at least partially covered in an electrically conductive material.
Preferably the solid object, the annular object, the regular shaped object, the irregular shaped object, the symmetrical object, the asymmetrical object and/or the like, can be of any suitable shape is arranged so as to allow electromagnetic waves to propagate or travel in opposing directions around the same in use.
Preferably the resonating means can be formed from an electrically conductive material including any or any combination of one or more transmission lines, metals, strip lines, slab lines, micro-strip and/or the like.
Preferably the one or more metals are silver and/or copper.
In one embodiment the resonating means is formed from or including a dielectric material, such as a ceramic material.
In one example the dielectric material is in the form a ceramic puck and/or the like.
In one embodiment the dielectric material resonating means is located on a base of a cavity defined in a body portion of filter apparatus.
In one embodiment the resonating means formed from or including a dielectric material optionally includes an electrically conductive object, coating and/or layer provided on at least one external surface thereof.
Preferably the electrically conductive object, coating and/or layer is formed from any or any combination of a metal, a low loss material, a material on which a metallic coating and/or layer has been provided or plated and/or the like.
Preferably the electrically conductive object, coating and/or layer is provided on an upper surface of the dielectric material, or on a surface opposite to the surface on which the dielectric material is located on within the cavity in use.
Preferably the electrically conductive object, coating and/or layer is a solid object or prism, annular in shape, regular shaped, irregular shaped, symmetrical, asymmetrical and/or the like.
In one embodiment the resonating means is in the form of an annular disc.
In one embodiment the input coupling and/or output coupling is physically connected to the resonating means, such as for example via solder.
In one embodiment the input coupling and/or output coupling is electrically or electromagnetically coupled to the resonating means, and may or may not be physically connected to the resonating means.
In one embodiment the resonator apparatus includes a cavity, or a cavity within a housing in which the resonating means is located in use.
Preferably the cavity is defined in a body portion of filter apparatus, in a body portion formed from or coated in electrically conductive material and/or the like.
Preferably the cavity in which the resonating means is located can be any suitable shape.
In one embodiment a plurality of resonator apparatus are cascaded or coupled together to form a higher order filter than a second order filter. For example, if two resonator apparatus are cascaded together, this provides a fourth order filter with four transmission zeroes. Typically a ‘n’th order filter will produce ‘n’ transmission zeroes in accordance with the present invention (n=integer).
According to one aspect of the present invention there is provided resonator apparatus for use in radio frequency filter apparatus, said resonator apparatus comprising resonating means creating or supporting at least two resonant modes at the same or substantially the same frequency, said resonating means having an input coupling and an output coupling, and wherein said input and output couplings are arranged such that at least two transmission zeroes are created by said apparatus at finite frequencies without the need for any cross couplings between the resonant modes.
According to one aspect of the present invention there is provided resonator apparatus for use in filter apparatus, said resonator apparatus comprising resonating means creating or supporting at least two resonant modes, said resonating means having an input coupling and an output coupling, and wherein said input and output couplings are arranged such that electromagnetic waves can propagate around the resonating means, and wherein the sum of the waves are added together to create a second order passband at a first frequency or first set of frequencies and the sum of the waves cancel out to create at least two transmission zeroes at a second frequency or second set of frequencies and a third frequency or third set of frequencies.
According to a further aspect of the present invention there is provided filter apparatus including resonator apparatus.
Preferably the filter apparatus includes at least one resonator apparatus located in a cavity defined within the filter apparatus.
Preferably the filter apparatus includes input means or an input port and output means or an output port for allowing one or more radio frequency signals to enter and/or leave the apparatus respectively.
According to a yet further aspect of the present invention there is provided a telecommunication system including filter apparatus and resonator apparatus. According to one aspect of the present invention there is provided a method of assembling resonator apparatus for use in radio frequency filter apparatus, said method including the steps of providing resonating means that create or support at least two resonant modes, and arranging said resonator apparatus such that at least two transmission zeroes are created by said apparatus without the need for any cross couplings between the resonant modes.
According to one aspect of the present invention there is provided a method of using resonator apparatus for use in radio frequency filter apparatus, said method including the steps of providing resonating means that create or support at least two resonant modes, and arranging said resonator apparatus such that at least two transmission zeroes are created by said apparatus without the need for any cross couplings between the resonant modes.
According to one aspect of the present invention there is provided a method of using or assembling filter apparatus including resonator apparatus.
According to one aspect of the present invention there is provided a method of using or assembling a telecommunication system.
Embodiments of the present invention will now be described with reference to the following figures, wherein:
Figure 1 (PRIOR ART) is an example of a conventional combline resonator for use in a combline filter;
Figure 2 (PRIOR ART) is an example of radio frequency filter apparatus topology used for high performance filters;
Figure 3 is a simplified view of resonator apparatus according to a first embodiment of the present invention;
Figure 4 is a simplified view of resonator apparatus according to a second embodiment of the present invention;
Figure 5 is a simplified view of resonator apparatus according to a third embodiment of the present invention;
Figure 6 is a simplified view of resonator apparatus according to a fourth embodiment of the present invention;
Figure 7 is a simplified view of resonator apparatus according to a fifth embodiment of the present invention;
Figure 8 is a simplified view of resonator apparatus according to a sixth embodiment of the present invention;
Figure 9 is a simplified view of resonator apparatus according to a seventh embodiment of the present invention;
Figure 10 is a simplified view of resonator apparatus according to a eight embodiment of the present invention;
Figure 11 is a simplified view of resonator apparatus according to a ninth embodiment of the present invention; and
Figure 12 is a simplified view of resonator apparatus according to a tenth embodiment of the present invention.
Referring to figure 3, there is illustrated resonator apparatus 100 according to an embodiment of the present invention. The resonator apparatus is shown in a square box which represents a cavity 102 of a body portion of filter apparatus. However, it will be appreciated by persons skilled in the art that the apparatus does not need to include a cavity 102, and if a cavity is provided, the cavity can be any suitable shape, such as curved, circular, rectangular and/or the like.
A dielectric substrate 104 is suspended or joined within the cavity 102. The substrate in this illustration is a sheet or plate like member which substantially fills a section of the cavity space. Thus, the substrate 104 is a spaced distance apart from a base 106 and a top 108 of cavity 102. The substrate 104 is joined to side walls 110 of the body portion defining the cavity. However, the substrate only needs to partially protrude into the cavity space and does not need to touch all the side walls in some examples.
Resonating means in the form of an annular disc 112 is located on the substrate 104, together with an input coupling 114 and an output coupling 116.
The annular disc 112 is made of electrically conductive material, such as metal, and can be a three dimensional prism like object formed from said material or can be at least one coating or layer formed from said material. The disc 112, input coupling 114 and output coupling 116 are arranged such that electromagnetic waves can propagate around the disc in opposing directions, as shown by arrows 118, 120, such that the sum of the waves are added to create a second order passband at a first set of frequencies, and the sum of the waves cancel out to create two transmission zeroes at second and third sets of finite frequencies, different to each other and to the first set of frequencies.
Figure 4 illustrates a further embodiment of the present invention, wherein the dielectric substrate 104 is no longer present and the resonating means, in the form of annular disc 112, is suspended within cavity 102 via an input coupling member 122 and an output coupling member 124. The apparatus functions in a similar manner to the embodiment shown in figure 3.
Figure 5 illustrates a further embodiment of the present invention, wherein the resonating means is in the form of a cylindrical dielectric material, such as a low loss ceramic puck 126, located on a base 106 of the cavity 102. The input coupling member 128 and the output coupling member 130 are suspended from side walls 110 of the cavity in such a manner to allow electromagnetic coupling with puck 126 in use.
Figure 6 is an example of a ceramic puck 126 that can be used in the embodiment shown in figure 5. In this example, a metallic disc 132 is located on a top surface 134 of puck 126. The top surface 134 of puck 126 is typically the surface facing away from the base 106 of the cavity on which the puck 126 is located in use. The disc 132 can be a three dimensional prism or can be at least one coating or layer of a metallic material. The provision of a disc 132 on top of the ceramic puck 126 allows the puck to have smaller dimensions compared to when a disc 132 is not used.
Figure 7 shows a further example of a ceramic puck 126 in which the metallic disc, coating or layer is a metallic annular disc 136, coating or layer.
Figure 8 shows the ceramic puck 126 in figure 6 but with the input and output couplings 138, 140 shown.
Figure 9 shows an alternative arrangement to figure 5 wherein the input and output couplings 142, 144 respectively are in the form of metallic members joined to base 106 of the cavity in which the ceramic puck 126 is located in use.
Figure 10 shows an arrangement of ceramic puck 126 similar to that shown in figure 6, wherein the metallic disc 132 is of an irregular shape rather than being cylindrical, having a recess 146 defined adjacent a peripheral edge of disc 132.
Figure 11 shows an arrangement of ceramic puck 126 similar to that shown in figure 5, wherein the puck itself is of an irregular shape rather than being cylindrical, having a recess 148 defined in a side wall 150 of the puck. A longitudinal axis of the recess 148 is parallel to a height or longitudinal axis of the puck 126.
Figure 12 shows an alternative arrangement to figure 8, wherein the input and output couplings 138, 140 are provided with discs 152 on the same. In the embodiment shown, the couplings 138, 140 each pass through a centre of an electrically conductive disc 152 respectively.
In the illustrations, the input and output couplings are arranged at 90 degrees to each other. However, other angles and spacing of the input and output couplings are envisaged within the scope of the present invention.
One or more parameters of the input and output coupling and/or the resonating means can be adjusted to allow adjustment of the position of the transmission zeroes within the RF spectrum. For example, the one or more parameters could include the length of the coupling, or height of the coupling, the width of the coupling, the relative angle between the couplings, the wave impedance of the resonating means and/or the like.
Claims (22)
1. Resonator apparatus for use in radio frequency filter apparatus, said resonator apparatus comprising resonating means creating or supporting at least two resonant modes, and wherein said resonator apparatus is arranged such that at least two transmission zeroes are created by said apparatus without the need for any cross couplings between the resonant modes.
2. Resonator apparatus according to claim 1 wherein the apparatus includes an input coupling, for allowing one or more electromagnetic waves to enter into the resonator apparatus in use, and an output coupling for allowing one or more electromagnetic waves to leave the resonator apparatus in use.
3. Resonator apparatus according to any preceding claim wherein the at least two resonant modes are at the same or substantially the same resonant frequency or frequency range.
4. Resonator apparatus according to claim 2 wherein the input and output couplings are arranged such that the at least two transmission zeroes are provided at finite frequencies.
5. Resonator apparatus according to any preceding claim wherein the electromagnetic waves can propagate around the resonating means in opposing directions to create the at least two resonant modes.
6. Resonator apparatus according to claim 5 wherein the input and output couplings are arranged such that the sum of the electromagnetic waves travelling or propagating in opposing directions around the resonating means in use can be added together to create a second order passband at a first frequency or first set of frequencies, and the sum of the electromagnetic waves travelling or propagating in opposing directions cancel out to create at least two transmission zeroes at a second frequency or second set of frequencies and at least a third frequency or third set of frequencies.
7. Resonator apparatus according to claim 6 wherein the first, second and at least third frequencies or sets of frequencies are different or substantially different.
8. Resonator apparatus according to claim 6 wherein the second and at least third frequencies or sets of frequencies are lower in frequency than the passband of the first frequency or first set of frequencies.
9. Resonator apparatus according to claim 6 wherein the second and at least third frequencies or sets of frequencies are higher than the passband of the first frequency or first set of frequencies, but they are lower than the re-resonances of the resonating means.
10. Resonator apparatus according to claim 6 wherein one of the second and at least third frequencies or sets of frequencies are higher than the passband of the first frequency or first set of frequencies, and the other of the second and at least third frequencies or sets of frequencies are lower than the passband of the first frequency or first set of frequencies.
11. Resonator apparatus according to claims 2 or 6 wherein the input coupling and the output coupling are arranged to be at an angle of approximately 80-110 degrees.
12. Resonator apparatus according to claim 11 wherein the input coupling and output coupling are arranged to be at 90 or substantially 90 degrees to each other.
13. Resonator apparatus according to any preceding claim wherein one or more dimensions, length, width, thickness, height relative to the resonating means or type of coupling of the input coupling and/or the output coupling of the apparatus is adjustable to adjust the first, second and at least third frequencies or sets of frequencies and/or frequency of the transmission zeroes.
14. Resonator apparatus according to claim 5 wherein adjustment of electromagnetic wave impedance in either direction is used to adjust the frequencies of the transmission zeroes.
15. Resonator apparatus according to any preceding claim wherein the resonating means is in the form of at least one layer or coating or electrically conductive material provided on a dielectric material or substrate, ceramic and/or printed circuit board (PCB); any or any combination of a solid object, a symmetrical object, an asymmetrical object, annular disc, formed from, including, coated with or at least partially covered in an electrically conductive material; is formed from an electrically conductive material including any or any combination of one or more transmission lines, metals, strip lines, slab lines or microstrip; and/or is formed from a dielectric material, ceramic or a ceramic puck.
16. Resonator apparatus according to any preceding claim wherein the resonating means is located or suspended within a space or cavity of a housing or filter apparatus.
17. Resonator apparatus according to claim 16 wherein the resonating means are suspended by suspension means, one or more suspension members, support members, clips, bracket members, rods, pins and/or at least part of a member forming at least part of or consisting of the input coupling and/or output coupling to the resonating means.
18. Resonator apparatus according to claim 15 wherein the electrically conductive object, coating and/or layer is provided on an upper surface of the dielectric material, or on a surface opposite to the surface on which the dielectric material is located on within the cavity in use.
19. Resonator apparatus according to claim 2 wherein the input coupling and/or output coupling is physically connected to the resonating means.
20. Resonator apparatus according to claim 2 wherein the input coupling and/or output coupling is electrically or electromagnetically coupled to the resonating means.
21. Resonator apparatus according to any preceding claim wherein a plurality of resonator apparatus are cascaded or coupled together to form a higher order filter than a second order filter, wherein a ‘nth’ order filter will produce cn’ transmission zeroes (n=integer).
22. A method of assembling resonator apparatus for use in radio frequency filter apparatus, said method including the steps of providing resonating means that create or support at least two resonant modes, and arranging said resonator apparatus such that at least two transmission zeroes are created by said apparatus without the need for any cross couplings between the resonant modes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB1716629.9A GB201716629D0 (en) | 2017-10-11 | 2017-10-11 | Filter apparatus and method of use thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201816510D0 GB201816510D0 (en) | 2018-11-28 |
| GB2567962A true GB2567962A (en) | 2019-05-01 |
Family
ID=60326713
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1716629.9A Ceased GB201716629D0 (en) | 2017-10-11 | 2017-10-11 | Filter apparatus and method of use thereof |
| GB1816510.0A Withdrawn GB2567962A (en) | 2017-10-11 | 2018-10-10 | Resonator apparatus and method of use thereof |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1716629.9A Ceased GB201716629D0 (en) | 2017-10-11 | 2017-10-11 | Filter apparatus and method of use thereof |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB201716629D0 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6326865B1 (en) * | 1999-09-30 | 2001-12-04 | Tdk Corporation | Dual-mode filter and design method therefor |
| JP2008306361A (en) * | 2007-06-06 | 2008-12-18 | Mitsubishi Electric Corp | High-frequency filter |
| US20090189716A1 (en) * | 2008-01-25 | 2009-07-30 | National Taiwan University | Filter device with finite transmission zeros |
| CN101950825A (en) * | 2010-09-01 | 2011-01-19 | 华东交通大学 | Novel compact dual-mode band-pass filter |
| CN105322254A (en) * | 2015-11-19 | 2016-02-10 | 南京邮电大学 | Direct-feed planar dual-mode ring band-pass filter with adjustable bandwidth |
-
2017
- 2017-10-11 GB GBGB1716629.9A patent/GB201716629D0/en not_active Ceased
-
2018
- 2018-10-10 GB GB1816510.0A patent/GB2567962A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6326865B1 (en) * | 1999-09-30 | 2001-12-04 | Tdk Corporation | Dual-mode filter and design method therefor |
| JP2008306361A (en) * | 2007-06-06 | 2008-12-18 | Mitsubishi Electric Corp | High-frequency filter |
| US20090189716A1 (en) * | 2008-01-25 | 2009-07-30 | National Taiwan University | Filter device with finite transmission zeros |
| CN101950825A (en) * | 2010-09-01 | 2011-01-19 | 华东交通大学 | Novel compact dual-mode band-pass filter |
| CN105322254A (en) * | 2015-11-19 | 2016-02-10 | 南京邮电大学 | Direct-feed planar dual-mode ring band-pass filter with adjustable bandwidth |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201716629D0 (en) | 2017-11-22 |
| GB201816510D0 (en) | 2018-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |