GB1190495A - Improvements in or relating to Waveguide Filters - Google Patents
Improvements in or relating to Waveguide FiltersInfo
- Publication number
- GB1190495A GB1190495A GB2469368A GB2469368A GB1190495A GB 1190495 A GB1190495 A GB 1190495A GB 2469368 A GB2469368 A GB 2469368A GB 2469368 A GB2469368 A GB 2469368A GB 1190495 A GB1190495 A GB 1190495A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screws
- frequency
- waveguide
- mode
- capacitive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/219—Evanescent mode filters
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
1,190,495. Microwave filters. STANDARD TELEPHONES & CABLES Ltd. 23 May, 1968, No. 24693/68. Heading H1W. A waveguide bandpass filter utilizes a length of square- or circular-section waveguide having a cut-off frequency above the operating frequency and capable of supporting evanescent H and E waves, the waveguide being provided with obstacles each having a capacitive reactance which is the conjugate of the positive imaginary characteristic impedance which the waveguide presents to evanescent waves. The cut-off waveguide 3 is connected at either end to propagating H 01 mode rectangular guides 1, 2 and consists of three sections of length l. The inner section is provided with a single capacitive screw (or iris) 6 and the two outer sections with opposed capacitive screws 4, 5. Screws 7 are for matching purposes. If each screw 4, 5, 6 is adjusted to provide a capacitive reactance conjugate to the inductive reactance of the respective section, it can be shown that each section behaves as a passband filter. Apart from this, the filter has additional properties caused by the transformation of the incident H 01 (or H 11 ) mode energy into E 11 (or E 01 ) mode energy by the capacitive obstacles 4, 5. It is shown in the Specification that an equivalent circuit which takes into account the effect of the evanescent E mode wave includes a parallel resonant circuit in the series branch, whereby the possibility of a rejection frequency arises. The frequency at which rejection occurs depends upon the H-#E transformation ratio determined by the screws 4, 5 and the sign of this ratio depends upon the polarity of the E mode relative to the incident H mode. This, in turn, depends upon which side of the centre-line of the guide the gap between screws 4, 5 is situated. Thus, the rejection frequency may be shifted by adjusting the relative penetration d 1 , d 2 of the screws 4, 5. Thus, the lowest rejection frequency is achieved with d 2 = 0 and D 1 = max., i.e. with all the screws on one side of the guide. With screws on alternate sides of the guide (d 1 = 0) the rejection frequency is more remote from the passband. To achieve a controllable rejection frequency, two sections are necessary, one with a single obstacle and the other with a pair of opposed obstacles, but the order in which they occur is not significant. Thus screws 4, 5 may be interchanged with screw 6 in the illustrated embodiment.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2469368A GB1190495A (en) | 1968-05-23 | 1968-05-23 | Improvements in or relating to Waveguide Filters |
CH778369A CH491513A (en) | 1968-05-23 | 1969-05-22 | Waveguide filter |
BE761881A BE761881A (en) | 1968-05-23 | 1971-01-22 | WAVE GUIDE FILTERS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2469368A GB1190495A (en) | 1968-05-23 | 1968-05-23 | Improvements in or relating to Waveguide Filters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1190495A true GB1190495A (en) | 1970-05-06 |
Family
ID=10215778
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2469368A Expired GB1190495A (en) | 1968-05-23 | 1968-05-23 | Improvements in or relating to Waveguide Filters |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE761881A (en) |
CH (1) | CH491513A (en) |
GB (1) | GB1190495A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0205151A1 (en) * | 1985-06-13 | 1986-12-17 | Alcatel Transmission Par Faisceaux Hertziens A.T.F.H. | Evanescent-mode microwave band-pass filter |
EP0346806A1 (en) * | 1988-06-17 | 1989-12-20 | Alcatel Telspace | Band-pass-filter with dielectric resonators |
CN109713412A (en) * | 2018-12-20 | 2019-05-03 | 常州机电职业技术学院 | A kind of tunable face the E cutting face H waveguide bandpass filter and its design method |
CN113224533A (en) * | 2021-04-23 | 2021-08-06 | 华南理工大学 | Coaxial waveguide filter antenna with adjustable frequency |
-
1968
- 1968-05-23 GB GB2469368A patent/GB1190495A/en not_active Expired
-
1969
- 1969-05-22 CH CH778369A patent/CH491513A/en not_active IP Right Cessation
-
1971
- 1971-01-22 BE BE761881A patent/BE761881A/en unknown
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0205151A1 (en) * | 1985-06-13 | 1986-12-17 | Alcatel Transmission Par Faisceaux Hertziens A.T.F.H. | Evanescent-mode microwave band-pass filter |
FR2583597A1 (en) * | 1985-06-13 | 1986-12-19 | Alcatel Thomson Faisceaux | HYPERFREQUENCY PASSPORT FILTER IN EVANESCENT MODE |
US4746883A (en) * | 1985-06-13 | 1988-05-24 | Alcatel Thomson Faiscaeux Hertziens | Evanescent mode microwave bandpass filter with a rotatable crank shape coupling antenna |
EP0346806A1 (en) * | 1988-06-17 | 1989-12-20 | Alcatel Telspace | Band-pass-filter with dielectric resonators |
FR2633118A1 (en) * | 1988-06-17 | 1989-12-22 | Alcatel Thomson Faisceaux | DIELECTRIC RESONATOR PASSER FILTER |
CN109713412A (en) * | 2018-12-20 | 2019-05-03 | 常州机电职业技术学院 | A kind of tunable face the E cutting face H waveguide bandpass filter and its design method |
CN109713412B (en) * | 2018-12-20 | 2024-03-29 | 常州机电职业技术学院 | Tunable E-plane cutting H-plane waveguide band-pass filter and design method thereof |
CN113224533A (en) * | 2021-04-23 | 2021-08-06 | 华南理工大学 | Coaxial waveguide filter antenna with adjustable frequency |
Also Published As
Publication number | Publication date |
---|---|
BE761881A (en) | 1971-07-22 |
CH491513A (en) | 1970-05-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) |