CA2113258A1 - Triple mode microwave filter - Google Patents
Triple mode microwave filterInfo
- Publication number
- CA2113258A1 CA2113258A1 CA 2113258 CA2113258A CA2113258A1 CA 2113258 A1 CA2113258 A1 CA 2113258A1 CA 2113258 CA2113258 CA 2113258 CA 2113258 A CA2113258 A CA 2113258A CA 2113258 A1 CA2113258 A1 CA 2113258A1
- Authority
- CA
- Canada
- Prior art keywords
- mode
- cavity
- resonant
- microwave filter
- triple
- 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.)
- Abandoned
Links
- 230000008878 coupling Effects 0.000 claims description 16
- 238000010168 coupling process Methods 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 239000000523 sample Substances 0.000 claims description 8
- 210000000554 iris Anatomy 0.000 description 4
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
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
A triple mode microwave filter comprises first and second resonant cavities (10, 20) coupled by an iris arrangement (6, 7) which couples only a single resonant mode of the first cavity to only a single resonant mode of the second cavity. The attenuation poles of the filter can be selected independently of each other: the bandpass has six poles and the filter is capable of an elliptic-function response.
Description
wo g3/0l626 ~ 2 ~ 1 3 2 5 ~ PCr/GB92/01276 Triple Mode ~icrowave Filter This invention relates ~o a triple mode microwave filter, the attenuation poles of which can be selected independently o~ each other.
Microwave bandpass filter~ are known which comprise two 5 resonant cavities, each su.pporting three resonant ~odes and the two cavities being coupled together. More particularly, the coupling between the two cavities has been via two or three pairs of modes and by selecting the param~ters of the cavities ~e.g. size and arrangement of coupling irises) to predetermine lO one of the attenuation poles, the other attenuation poles of the bandpass are pred~termin~d in consequence.
We have now devised a tripl~ mode microwave filter whi~h enables its a~tenuation poles to be selected or determined independently of each other.
In accordance with this invention there is provided a triple mode microwave filter which comprises first and second resonant cavities coupled by an iris arrangement which couples a single resonant mode of the ~irst cavity to a single resonant mode of the second cavity.
An embodiment of this invention will now be descri~ed by way of example only and with reference to the accompanying drawings, in which:
FIGURE 1 is a longitudinal section through a microwave filter in accordance with the invention;
FIGURE 2 is a view of one end of the fi~ter;
FIGURE 3 is a view of the opposite end of the filter;
and ~ FIGURE 4 is a plan view of a diaphragm with the ~ . ~ . .............................. .
coupling iris arrangëment of the filter~
: Referring to the drawîngs, there is ~hown a triple mode - :: microwave filter havi~g first and second cavities each of which supports three resonant modes~, wikh only a single mode of one cavity coupled to a single mode of the other cavit~y: as a result we have found that the attenuation poles of the filter 35 can be selected independently of each other. The bandpass has six poles and the filter is capable of an elliptic-function response.
The filter comprises two cylindrical members l, 2 each WO93~01626 21~ 32~8 PCT/GB92/01276 2 ~
with a closed end, so that each member is cup-shaped. The two members are fixed together with their open ends ~acing each other, but with a circular diaphragm 3 interposed, by means of bol~s passed through co-operating annular flanges 4, 5 of the 5 members 1, 2. The ~wo members 1, 2 thus define two cylindrical resonant cavities 10, 20. The diaphragm 3 i5 formed with two slot~ 6, 7 on a common diameter and equidistant from the centre (i.e. axis of the two cavities). Th~se slots provide an iris arrangement for coupling a single mode of one cavity to a single mode of the other, as will be described below.
The first cavity 10 has an input probe ll connectable to a coaxial cable carrying the input signal. This couples into a first TE~ resonant mode in cavity 10, which in turn couples to a TM~lo mode within the same cavity, which in turn couples to a second TEIl~ mode (orthogonal ~o the first~ within that cavity. The latter mbde, with its electric vector parallel to the diame~er on which the slots 6, 7 are positioned, couples into the secon~ cavi~y to support a ~irst TE~, mode, which in turn couples to a TMolo mode within that 20 cavity, which in turn couples to a second TE~I mode in that cavity ~orthogonal to the first such mode in that cavity.
- ~inally, the last-mèntioned mode couples to an output probe 21 which is conn~ctable to a coaxial cable to carry the output signal.
The input and output probes 11, 21 are aligned longitudinally on one side of the structure, at one end of the diameter on which slots 6, 7 are positioned, and each at the mid-height of its respective cavity.
..
Each cavity has three tuning screws to con~rol the 30 resonant frequency o~ its respective resonant modes: ea¢h such screw is positioned in a direction parallel to the maximum ~lectrical field:strength of the mode which it controls. Thus, cavity 10 has~ a first tuning screw 1~ in its side wall diametrically opposite the input probe 11 and at the mid-height 35 of the cavity, a second tuning screw 13 in the middle of its end wall, a~d a third turning screw 14 in its side wall at its mid height and at gO to the first screw 12. Similarly, cavity 20 has a first tuning screw 22 in its side wall at its mid-height and at 90 to the diameter on which the slots 6, 7 are WO~3/0162~ 2 ~ ~ 3 2 ~ 8 PCT/GBg2/01276 positioned, a second tuning screw 23 in the middle of its end wall, and a third tuning screw 24 in its side wall at its mid-height and diametrically opposite the output probe 21.
Each cavity has three additional screws to control the coupling between its resonant modes. These ~crews are shown at 15, 16, ~7 for cavity 10 and at 25, 2~, 27 for aavity 20, and are positioned at the junction between the side wall and end wall of each cavity in a direction 45 ~o the axis of the cavity. For cavity 10, screw 15 lies in the same plane as the slots 6, 7 and controls the coupling be~ween the first and second modes of that cavity , screw 16 lies at 90~ to screw 15 and controls the coupling betwe~n the second and third modes, and screw 17 lies at 45 to screw 16 and controls coupling between the f irst and third modes. For cavity 20, screw 2 5 lies at ~oo to the plane containing slots 6, 7 and controls the coupling between the first and second modes of that cavit~, screw 26 lies in the plane of slots 6, 7 and co~trols the coupling between the second and third modes of the cavity, and screw 27 lies at 45 to screw 25 and controls the coupling 20 between the first and third modes of the cavity.
. Each of the tunin~ and coupling ~crews 12 to 17 a~d 22 to 27 is threaded through the wall of the structure to project a short distance into the cavity (e.g. 2-3~m), the precise distance being adjusted to achieve the required tuning or 25 coupling~
- ~,
Microwave bandpass filter~ are known which comprise two 5 resonant cavities, each su.pporting three resonant ~odes and the two cavities being coupled together. More particularly, the coupling between the two cavities has been via two or three pairs of modes and by selecting the param~ters of the cavities ~e.g. size and arrangement of coupling irises) to predetermine lO one of the attenuation poles, the other attenuation poles of the bandpass are pred~termin~d in consequence.
We have now devised a tripl~ mode microwave filter whi~h enables its a~tenuation poles to be selected or determined independently of each other.
In accordance with this invention there is provided a triple mode microwave filter which comprises first and second resonant cavities coupled by an iris arrangement which couples a single resonant mode of the ~irst cavity to a single resonant mode of the second cavity.
An embodiment of this invention will now be descri~ed by way of example only and with reference to the accompanying drawings, in which:
FIGURE 1 is a longitudinal section through a microwave filter in accordance with the invention;
FIGURE 2 is a view of one end of the fi~ter;
FIGURE 3 is a view of the opposite end of the filter;
and ~ FIGURE 4 is a plan view of a diaphragm with the ~ . ~ . .............................. .
coupling iris arrangëment of the filter~
: Referring to the drawîngs, there is ~hown a triple mode - :: microwave filter havi~g first and second cavities each of which supports three resonant modes~, wikh only a single mode of one cavity coupled to a single mode of the other cavit~y: as a result we have found that the attenuation poles of the filter 35 can be selected independently of each other. The bandpass has six poles and the filter is capable of an elliptic-function response.
The filter comprises two cylindrical members l, 2 each WO93~01626 21~ 32~8 PCT/GB92/01276 2 ~
with a closed end, so that each member is cup-shaped. The two members are fixed together with their open ends ~acing each other, but with a circular diaphragm 3 interposed, by means of bol~s passed through co-operating annular flanges 4, 5 of the 5 members 1, 2. The ~wo members 1, 2 thus define two cylindrical resonant cavities 10, 20. The diaphragm 3 i5 formed with two slot~ 6, 7 on a common diameter and equidistant from the centre (i.e. axis of the two cavities). Th~se slots provide an iris arrangement for coupling a single mode of one cavity to a single mode of the other, as will be described below.
The first cavity 10 has an input probe ll connectable to a coaxial cable carrying the input signal. This couples into a first TE~ resonant mode in cavity 10, which in turn couples to a TM~lo mode within the same cavity, which in turn couples to a second TEIl~ mode (orthogonal ~o the first~ within that cavity. The latter mbde, with its electric vector parallel to the diame~er on which the slots 6, 7 are positioned, couples into the secon~ cavi~y to support a ~irst TE~, mode, which in turn couples to a TMolo mode within that 20 cavity, which in turn couples to a second TE~I mode in that cavity ~orthogonal to the first such mode in that cavity.
- ~inally, the last-mèntioned mode couples to an output probe 21 which is conn~ctable to a coaxial cable to carry the output signal.
The input and output probes 11, 21 are aligned longitudinally on one side of the structure, at one end of the diameter on which slots 6, 7 are positioned, and each at the mid-height of its respective cavity.
..
Each cavity has three tuning screws to con~rol the 30 resonant frequency o~ its respective resonant modes: ea¢h such screw is positioned in a direction parallel to the maximum ~lectrical field:strength of the mode which it controls. Thus, cavity 10 has~ a first tuning screw 1~ in its side wall diametrically opposite the input probe 11 and at the mid-height 35 of the cavity, a second tuning screw 13 in the middle of its end wall, a~d a third turning screw 14 in its side wall at its mid height and at gO to the first screw 12. Similarly, cavity 20 has a first tuning screw 22 in its side wall at its mid-height and at 90 to the diameter on which the slots 6, 7 are WO~3/0162~ 2 ~ ~ 3 2 ~ 8 PCT/GBg2/01276 positioned, a second tuning screw 23 in the middle of its end wall, and a third tuning screw 24 in its side wall at its mid-height and diametrically opposite the output probe 21.
Each cavity has three additional screws to control the coupling between its resonant modes. These ~crews are shown at 15, 16, ~7 for cavity 10 and at 25, 2~, 27 for aavity 20, and are positioned at the junction between the side wall and end wall of each cavity in a direction 45 ~o the axis of the cavity. For cavity 10, screw 15 lies in the same plane as the slots 6, 7 and controls the coupling be~ween the first and second modes of that cavity , screw 16 lies at 90~ to screw 15 and controls the coupling betwe~n the second and third modes, and screw 17 lies at 45 to screw 16 and controls coupling between the f irst and third modes. For cavity 20, screw 2 5 lies at ~oo to the plane containing slots 6, 7 and controls the coupling between the first and second modes of that cavit~, screw 26 lies in the plane of slots 6, 7 and co~trols the coupling between the second and third modes of the cavity, and screw 27 lies at 45 to screw 25 and controls the coupling 20 between the first and third modes of the cavity.
. Each of the tunin~ and coupling ~crews 12 to 17 a~d 22 to 27 is threaded through the wall of the structure to project a short distance into the cavity (e.g. 2-3~m), the precise distance being adjusted to achieve the required tuning or 25 coupling~
- ~,
Claims
(1) A triple mode microwave filter which comprises first and second resonant cavities (10,20) coupled by an iris arrangement (6,7) which couples a single resonant mode of the first cavity to a single resonant mode of the second cavity.
(2) A triple mode microwave filter as claimed in claim 1, in which the first and second resonant cavities comprise cylindrical cavities (10,20) aligned on a common axis and separated by a diaphragm (3) in which said iris arrangement (6,7) is formed.
(3) A triple mode microwave filter as claimed in claim 2, in which the first resonant cavity (10) includes an input probe (11) arranged to couple into a first TE111 resonant mode in the first resonant cavity, said first TE111 resonant mode coupling into a TM010 mode within the same cavity, and said TM010 mode coupling into a second TE111 mode within the same cavity.
(4) A triple mode microwave filter as claimed in claim 3, in which the iris arrangement (6,7) is arranged to couple said second TE111 mode in the first resonant cavity (10) with a first TE111 mode in the second cavity (20), which TE111 mode couples to a TM010 mode within the same cavity (20), which TM010 mode couples to a second TE111 mode in the same cavity (20).
(5) A triple mode microwave filter as claimed in claim 3 or 4, in which the second resonant cavity (20) has an output probe (21), said input and output probes (11,21) being longitudinally aligned and positioned substantially mid-way between opposite ends of the respective cavities (10,20).
(6) A triple mode microwave filter as claimed in any preceding claim, in which each resonant cavity is provided with a set of tuning screws (12 to 14, 22 to 24) to control the resonant frequency of its respective resonant modes.
(7) A triple mode microwave filter as claimed in any preceding claim, in which each resonant cavity is provided with a further set of screws (15 to 17, 25 to 27) to control the coupling between respective pairs of its resonant modes.
(2) A triple mode microwave filter as claimed in claim 1, in which the first and second resonant cavities comprise cylindrical cavities (10,20) aligned on a common axis and separated by a diaphragm (3) in which said iris arrangement (6,7) is formed.
(3) A triple mode microwave filter as claimed in claim 2, in which the first resonant cavity (10) includes an input probe (11) arranged to couple into a first TE111 resonant mode in the first resonant cavity, said first TE111 resonant mode coupling into a TM010 mode within the same cavity, and said TM010 mode coupling into a second TE111 mode within the same cavity.
(4) A triple mode microwave filter as claimed in claim 3, in which the iris arrangement (6,7) is arranged to couple said second TE111 mode in the first resonant cavity (10) with a first TE111 mode in the second cavity (20), which TE111 mode couples to a TM010 mode within the same cavity (20), which TM010 mode couples to a second TE111 mode in the same cavity (20).
(5) A triple mode microwave filter as claimed in claim 3 or 4, in which the second resonant cavity (20) has an output probe (21), said input and output probes (11,21) being longitudinally aligned and positioned substantially mid-way between opposite ends of the respective cavities (10,20).
(6) A triple mode microwave filter as claimed in any preceding claim, in which each resonant cavity is provided with a set of tuning screws (12 to 14, 22 to 24) to control the resonant frequency of its respective resonant modes.
(7) A triple mode microwave filter as claimed in any preceding claim, in which each resonant cavity is provided with a further set of screws (15 to 17, 25 to 27) to control the coupling between respective pairs of its resonant modes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919114971A GB9114971D0 (en) | 1991-07-11 | 1991-07-11 | Triple mode microwave filter |
| GB9114971.6 | 1991-07-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2113258A1 true CA2113258A1 (en) | 1993-01-21 |
Family
ID=10698189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2113258 Abandoned CA2113258A1 (en) | 1991-07-11 | 1992-07-13 | Triple mode microwave filter |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0593661A1 (en) |
| CA (1) | CA2113258A1 (en) |
| FI (1) | FI940087A0 (en) |
| GB (1) | GB9114971D0 (en) |
| WO (1) | WO1993001626A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130049901A1 (en) | 2011-08-23 | 2013-02-28 | Mesaplexx Pty Ltd | Multi-mode filter |
| US9406988B2 (en) | 2011-08-23 | 2016-08-02 | Mesaplexx Pty Ltd | Multi-mode filter |
| US20140097913A1 (en) | 2012-10-09 | 2014-04-10 | Mesaplexx Pty Ltd | Multi-mode filter |
| 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 |
| CN110364788B (en) * | 2018-04-11 | 2021-05-18 | 上海华为技术有限公司 | Filter device |
-
1991
- 1991-07-11 GB GB919114971A patent/GB9114971D0/en active Pending
-
1992
- 1992-07-13 EP EP92915853A patent/EP0593661A1/en not_active Withdrawn
- 1992-07-13 WO PCT/GB1992/001276 patent/WO1993001626A1/en not_active Application Discontinuation
- 1992-07-13 CA CA 2113258 patent/CA2113258A1/en not_active Abandoned
-
1994
- 1994-01-10 FI FI940087A patent/FI940087A0/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FI940087A (en) | 1994-01-10 |
| EP0593661A1 (en) | 1994-04-27 |
| FI940087A0 (en) | 1994-01-10 |
| WO1993001626A1 (en) | 1993-01-21 |
| GB9114971D0 (en) | 1991-08-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |