GB1277250A - Improvements in or relating to filter circuits - Google Patents
Improvements in or relating to filter circuitsInfo
- Publication number
- GB1277250A GB1277250A GB55044/69A GB5504469A GB1277250A GB 1277250 A GB1277250 A GB 1277250A GB 55044/69 A GB55044/69 A GB 55044/69A GB 5504469 A GB5504469 A GB 5504469A GB 1277250 A GB1277250 A GB 1277250A
- Authority
- GB
- United Kingdom
- Prior art keywords
- section
- energized
- pair
- transmission line
- modes
- 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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/075—Ladder networks, e.g. electric wave filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
Abstract
1277250 Filters WESTERN ELECTRIC CO Inc 11 Nov 1969 [18 Nov 1968] 55044/69 Heading H1W Filter circuits are constructed using a cascade of bimodal networks all of which are characterized by the same two normal modes, and including means, connecting adjacent pairs of the networks, for converting all of the wave energy from one of the normal modes in one network to the other of the normal modes in the next network. In the Fig. 2 embodiment, each network section 11, 12, 13, 14 is a section of a twinconductor coaxial transmission line having an outer conductor 32, the sections being coupled by phase-inverting transformers 24, 25, and 26 connected between one of the inner conductors and the outer conductor. The filter is energized by a signal source 18 through a hybrid transformer 19 such that, with the source connected to port 1, as shown, conductors 30 and 31 of section 11 are energized in phase i.e. in the symmetric mode, such that section 11 behaves as a length of transmission line of characteristic impedance Z 1 . The signal in conductor 30 undergoes a 180 degree phase shift in transformer 24, such that the signals on the two conductors of section 12 are 180 degrees out of phase i.e. section 12 is energized in the antisymmetric mode, and behaves as a length of transmission line of characteristic impedance Z 2 , where Z 2 is less than Z 1 . Thereafter successive sections are energized alternately in the symmetric and antisymmetric modes, providing characteristic impedances of Z 1 and Z 2 respectively. The filter of Fig. 4 is constructed of a cascade in which each bimodal network section is formed by a pair of quadrature hybrid couplers, the two couplers of each pair being rotated through 90 degrees with respect to one another, so that a pair of ports 3 and 4 symmetrically located with respect to one of the axes of symmetry is coupled to a pair of ports 1 and 3, symmetrically located with respect to the other axis of symmetry. Reference is made to further filters constructed by using a conductively bounded transmission line with discontinuities introduced at locations determined by the different field distributions for the different transmission modes, or employing the different response of gyromagnetic materials to oppositely rotating circularly polarized waves together with an array of longitudinally spaced half waveplates.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US77639868A | 1968-11-18 | 1968-11-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1277250A true GB1277250A (en) | 1972-06-07 |
Family
ID=25107270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB55044/69A Expired GB1277250A (en) | 1968-11-18 | 1969-11-11 | Improvements in or relating to filter circuits |
Country Status (5)
Country | Link |
---|---|
US (1) | US3605044A (en) |
BE (1) | BE741726A (en) |
FR (1) | FR2023512A1 (en) |
GB (1) | GB1277250A (en) |
SE (1) | SE362323B (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3723913A (en) * | 1972-05-30 | 1973-03-27 | Bell Telephone Labor Inc | Quadrature hybrid coupler using one-port, linear circuit elements |
US4390236A (en) * | 1981-03-19 | 1983-06-28 | Bell Telephone Laboratories, Incorporated | Tunable polarization independent wavelength filter |
US8392495B2 (en) * | 2009-02-09 | 2013-03-05 | Associated Universities, Inc. | Reflectionless filters |
GB2496390B (en) * | 2011-11-08 | 2017-06-28 | Filtronic Wireless Ltd | A filter block and a signal transceiver comprising such a filter block |
CN107078708B (en) | 2014-06-25 | 2021-02-09 | 联合大学公司 | Sub-network enhanced reflectionless filter topology |
US9923540B2 (en) | 2014-11-05 | 2018-03-20 | Associated Universities, Inc. | Transmission line reflectionless filters |
US10530321B2 (en) | 2015-10-30 | 2020-01-07 | Associated Universities, Inc. | Deep rejection reflectionless filters |
US10263592B2 (en) | 2015-10-30 | 2019-04-16 | Associated Universities, Inc. | Optimal response reflectionless filters |
US10374577B2 (en) | 2015-10-30 | 2019-08-06 | Associated Universities, Inc. | Optimal response reflectionless filters |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3184691A (en) * | 1961-11-29 | 1965-05-18 | Bell Telephone Labor Inc | Branching hybrid coupler network useful for broadband power-dividing, duplexing and frequency separation |
US3252113A (en) * | 1962-08-20 | 1966-05-17 | Sylvania Electric Prod | Broadband hybrid diplexer |
US3192490A (en) * | 1962-08-23 | 1965-06-29 | Westinghouse Electric Corp | Hybrid network having interconnected center tapped autotransformer windings |
US3329884A (en) * | 1964-06-08 | 1967-07-04 | Bell Telephone Labor Inc | Frequency multiplier utilizing a hybrid junction to provide isolation between the input and output terminals |
US3452300A (en) * | 1965-08-11 | 1969-06-24 | Merrimac Research & Dev Inc | Four port directive coupler having electrical symmetry with respect to both axes |
US3423688A (en) * | 1965-11-09 | 1969-01-21 | Bell Telephone Labor Inc | Hybrid-coupled amplifier |
US3444475A (en) * | 1967-04-19 | 1969-05-13 | Bell Telephone Labor Inc | Broadband hybrid-coupled circuit |
-
1968
- 1968-11-18 US US776398A patent/US3605044A/en not_active Expired - Lifetime
-
1969
- 1969-11-10 SE SE15383/69A patent/SE362323B/xx unknown
- 1969-11-11 GB GB55044/69A patent/GB1277250A/en not_active Expired
- 1969-11-13 FR FR6939007A patent/FR2023512A1/fr not_active Withdrawn
- 1969-11-14 BE BE741726D patent/BE741726A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE1957760A1 (en) | 1970-05-27 |
DE1957760B2 (en) | 1973-02-01 |
US3605044A (en) | 1971-09-14 |
BE741726A (en) | 1970-04-16 |
SE362323B (en) | 1973-12-03 |
FR2023512A1 (en) | 1970-08-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |