GB761778A - Microwave filters - Google Patents
Microwave filtersInfo
- Publication number
- GB761778A GB761778A GB31595/53A GB3159553A GB761778A GB 761778 A GB761778 A GB 761778A GB 31595/53 A GB31595/53 A GB 31595/53A GB 3159553 A GB3159553 A GB 3159553A GB 761778 A GB761778 A GB 761778A
- Authority
- GB
- United Kingdom
- Prior art keywords
- conductors
- sections
- resonant sections
- spaced
- resonant
- 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
- 239000004020 conductor Substances 0.000 abstract 6
- 238000012986 modification Methods 0.000 abstract 2
- 230000004048 modification Effects 0.000 abstract 2
- 239000003989 dielectric material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/02—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element
- H03L7/04—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element wherein the frequency-determining element comprises distributed inductance and capacitance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C3/00—Sorting according to destination
- B07C3/003—Destination control; Electro-mechanical or electro- magnetic delay memories
- B07C3/006—Electric or electronic control circuits, e.g. delay lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/18—Phase-shifters
- H01P1/184—Strip line phase-shifters
-
- 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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20363—Linear 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
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape 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
- H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/08—Microstrips; Strip lines
- H01P3/085—Triplate lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
- H01P5/107—Hollow-waveguide/strip-line transitions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
- H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips
- H01P5/187—Broadside coupled lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/247—Supports; Mounting means by structural association with other equipment or articles with receiving set with frequency mixer, e.g. for direct satellite reception or Doppler radar
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/06—Details
- H01Q9/065—Microstrip dipole antennas
Landscapes
- Electromagnetism (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Waveguides (AREA)
- Waveguide Connection Structure (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
761,778. Microwave filters. STANDARD TELEPHONES & CABLES, Ltd. Nov. 13, 1953 [Dec. 6, 1952], No. 31595/53. Class 40 (8). A filter comprises a line of the " line ground " type having conductors 1, 2 spaced by a dielectric 3, e.g. as described in Specifications 704,050, 708,601 and 761,764, either of the conductors having spaced susceptance gaps 7 to provide resonant sections 4, 5, 6 of a length equal to a half-wavelength or a multiple thereof. The resonant sections are coupled by quarterwavelength (#/4) sections 4a, 5a. Various shapes of gaps and arrangements of conductors are described. In one modification, Fig. 9, resonant sections 19, 20 are coupled by a #/4 section 21. In a further modification (Fig. 11, not shown), the resonant sections may be in a different plane from the conductor, being spaced above the conductor by a layer of dielectric material which may be integral with the material between the conductors. The resonant sections may be tuned by the methods disclosed in Specifications 761,761 and 761,762.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US286762A US2794174A (en) | 1952-05-08 | 1952-05-08 | Microwave transmission systems and impedance matching devices therefor |
US324545A US2859417A (en) | 1952-05-08 | 1952-12-06 | Microwave filters |
US749337XA | 1953-03-26 | 1953-03-26 | |
US3159253A | 1953-11-13 | 1953-11-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB761778A true GB761778A (en) | 1956-11-21 |
Family
ID=32329982
Family Applications (7)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2013/53A Expired GB726067A (en) | 1952-05-08 | 1953-01-23 | Microwave coupling arrangements |
GB12110/53A Expired GB761761A (en) | 1952-05-08 | 1953-05-01 | Microwave filters |
GB12111/53A Expired GB761762A (en) | 1952-05-08 | 1953-05-01 | Microwave transmission systems and impedance matching devices therefor |
GB12114/53A Expired GB761765A (en) | 1952-05-08 | 1953-05-01 | Microwave transmission line |
GB31595/53A Expired GB761778A (en) | 1952-05-08 | 1953-11-13 | Microwave filters |
GB8111/54A Expired GB749337A (en) | 1952-05-08 | 1954-03-19 | Radio frequency circuits |
GB14706/56A Expired GB809482A (en) | 1952-05-08 | 1956-05-11 | Microwave lines and high q filters |
Family Applications Before (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2013/53A Expired GB726067A (en) | 1952-05-08 | 1953-01-23 | Microwave coupling arrangements |
GB12110/53A Expired GB761761A (en) | 1952-05-08 | 1953-05-01 | Microwave filters |
GB12111/53A Expired GB761762A (en) | 1952-05-08 | 1953-05-01 | Microwave transmission systems and impedance matching devices therefor |
GB12114/53A Expired GB761765A (en) | 1952-05-08 | 1953-05-01 | Microwave transmission line |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8111/54A Expired GB749337A (en) | 1952-05-08 | 1954-03-19 | Radio frequency circuits |
GB14706/56A Expired GB809482A (en) | 1952-05-08 | 1956-05-11 | Microwave lines and high q filters |
Country Status (6)
Country | Link |
---|---|
US (2) | US2859417A (en) |
BE (4) | BE533239A (en) |
CH (4) | CH316574A (en) |
DE (3) | DE1036950B (en) |
FR (13) | FR1072220A (en) |
GB (7) | GB726067A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2153155A (en) * | 1984-01-24 | 1985-08-14 | Secr Defence | Improvements on or relating to microwave filters |
Families Citing this family (51)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3011009A (en) * | 1956-06-28 | 1961-11-28 | William J Titus | Structural components for aircraft or the like |
US2962716A (en) * | 1957-06-21 | 1960-11-29 | Itt | Antenna array |
US2954468A (en) * | 1958-03-25 | 1960-09-27 | Thompson Ramo Wooldridge Inc | Microwave filter and detector |
US2977484A (en) * | 1958-09-10 | 1961-03-28 | Rca Corp | Logic circuit for a radio frequency carrier information handling system |
US2976498A (en) * | 1959-08-03 | 1961-03-21 | Electronic Specialty Co | Radio frequency filter |
US3104362A (en) * | 1959-08-27 | 1963-09-17 | Thompson Ramo Wooldridge Inc | Microwave filter |
US3111634A (en) * | 1960-05-13 | 1963-11-19 | Singer Inc H R B | Strip transmission line modulator |
US3156880A (en) * | 1960-08-04 | 1964-11-10 | Melpar Inc | Lumped constant filter |
NL269350A (en) * | 1960-09-20 | |||
US3136946A (en) * | 1960-09-29 | 1964-06-09 | Itt | Microwave resistance measuring system including thermoplastic microstrip coupler |
US3166723A (en) * | 1961-03-06 | 1965-01-19 | Micro Radionics Inc | Variable directional coupler having a movable articulated conductor |
US3164791A (en) * | 1961-05-05 | 1965-01-05 | Melpar Inc | Strip line hybrid ring |
DE1244257B (en) * | 1961-05-25 | 1967-07-13 | Emi Ltd | Circuit arrangement for the reaction-free coupling of two voltages to form a total voltage with three strip conductors opposite a grounded common conductor |
US3153209A (en) * | 1962-06-18 | 1964-10-13 | Julius A Kaiser | Microwave filter utilizing two resonant rings and having terminals permitting use to band pass or band reject |
US3345589A (en) * | 1962-12-14 | 1967-10-03 | Bell Telephone Labor Inc | Transmission line type microwave filter |
US3235820A (en) * | 1963-08-12 | 1966-02-15 | Hughes Aircraft Co | Electrically variable phase shifter |
US3228030A (en) * | 1965-06-11 | 1966-01-04 | Gen Dynamics Corp | Shielded antenna |
JPS5130421B1 (en) * | 1965-09-30 | 1976-09-01 | ||
DE1297719B (en) * | 1967-01-12 | 1969-06-19 | Stassfurt Fernsehgeraete | Tunable line circuits for high-frequency electrical oscillations in stripline technology |
US3548344A (en) * | 1967-07-28 | 1970-12-15 | Varian Associates | Stripline gain equalizer |
US3605045A (en) * | 1969-01-15 | 1971-09-14 | Us Navy | Wide-band strip line frequency-selective circuit |
US3688225A (en) * | 1969-05-21 | 1972-08-29 | Us Army | Slot-line |
US3623112A (en) * | 1969-12-19 | 1971-11-23 | Bendix Corp | Combined dipole and waveguide radiator for phased antenna array |
US3668569A (en) * | 1970-05-27 | 1972-06-06 | Hazeltine Corp | Distributed-constant dispersive network |
US3921177A (en) * | 1973-04-17 | 1975-11-18 | Ball Brothers Res Corp | Microstrip antenna structures and arrays |
US3909755A (en) * | 1974-07-18 | 1975-09-30 | Us Army | Low pass microwave filter |
JPS5336284B2 (en) * | 1974-09-06 | 1978-10-02 | ||
US4035807A (en) * | 1974-12-23 | 1977-07-12 | Hughes Aircraft Company | Integrated microwave phase shifter and radiator module |
DE2742779C1 (en) * | 1977-09-23 | 1999-07-08 | Raytheon Co | Strip conductor mixer circuit |
FR2460049A1 (en) * | 1979-06-25 | 1981-01-16 | Labo Electronique Physique | BANDWHEEL FILTER FOR A HYPERFREQUENCY TRANSMISSION LINE AND A MICROWAVE TRANSISTOR POLARIZATION CIRCUIT COMPRISING THE FILTER |
FR2487588A1 (en) | 1980-07-23 | 1982-01-29 | France Etat | DOUBLE REPLIES IN PLATES FOR VERY HIGH FREQUENCY AND NETWORKS OF SUCH DOUBLETS |
US4316160A (en) * | 1980-07-28 | 1982-02-16 | Motorola Inc. | Impedance transforming hybrid ring |
FR2494942B1 (en) * | 1980-11-21 | 1985-07-12 | Radiotechnique Compelec | TELEVISION RECEIVING HEAD |
EP0068345A1 (en) * | 1981-06-25 | 1983-01-05 | Communications Satellite Corporation | Symmetrical coupled line coplanar waveguide filter |
US4420839A (en) * | 1982-03-30 | 1983-12-13 | Bunker Ramo-Eltra Corporation | Hybrid ring having improved bandwidth characteristic |
US4610032A (en) * | 1985-01-16 | 1986-09-02 | At&T Bell Laboratories | Sis mixer having thin film wrap around edge contact |
GB2189652B (en) * | 1986-03-26 | 1990-01-24 | Plessey Co Plc | Adaptor for connecting a coaxial transmission line to a parallel plate transmission medium |
US4937585A (en) * | 1987-09-09 | 1990-06-26 | Phasar Corporation | Microwave circuit module, such as an antenna, and method of making same |
US5093640A (en) * | 1989-09-29 | 1992-03-03 | Hewlett-Packard Company | Microstrip structure having contact pad compensation |
FR2670327A1 (en) * | 1990-12-06 | 1992-06-12 | Europ Agence Spatiale | HYPERFREQUENCY HYBRID COUPLER WITH 3XN INPUTS AND 3XM OUTPUTS, IN PARTICULAR COUPLER 3X3. |
US5334961A (en) * | 1991-08-12 | 1994-08-02 | Matsushita Electric Industrial Co., Ltd. | Strip-line type bandpass filter |
US5432489A (en) * | 1992-03-09 | 1995-07-11 | Lk-Products Oy | Filter with strip lines |
FI90478C (en) * | 1992-03-09 | 1994-02-10 | Lk Products Oy | Filter |
US5499001A (en) * | 1994-02-24 | 1996-03-12 | Degun; Joginder S. | Cavity matched hybrid coupler |
DE19636890C1 (en) | 1996-09-11 | 1998-02-12 | Bosch Gmbh Robert | Transition from a waveguide to a strip line |
JP2001136003A (en) | 1999-11-05 | 2001-05-18 | Murata Mfg Co Ltd | Dielectric filter, dielectric duplexer and communication unit |
FR2857165A1 (en) | 2003-07-02 | 2005-01-07 | Thomson Licensing Sa | BI-BAND ANTENNA WITH DOUBLE ACCESS |
KR101308301B1 (en) * | 2006-03-01 | 2013-09-17 | 알카텔-루센트 유에스에이 인코포레이티드 | Meta-material filter for use in a base station of a wireless communications system |
US7873329B2 (en) | 2006-04-25 | 2011-01-18 | ThruVision Systems Limited | Transceiver having mixer/filter within receiving/transmitting cavity |
WO2007125326A1 (en) | 2006-04-25 | 2007-11-08 | Thruvision Limited | Radiation detector |
US7616058B1 (en) | 2006-08-28 | 2009-11-10 | Raif Awaida | Radio frequency power combining |
Family Cites Families (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2274346A (en) * | 1938-01-27 | 1942-02-24 | Telefunken Gmbh | Frequency selective transmission line |
BE434940A (en) * | 1938-06-22 | |||
DE866061C (en) * | 1940-09-03 | 1953-02-05 | Blaupunkt Elektronik G M B H | Device for adjusting the phase position of an electromagnetic oscillation in a waveguide |
GB578911A (en) * | 1941-08-26 | 1946-07-17 | Gen Electric Co Ltd | Improvements in electrical apparatus adapted to operate at very high frequencies |
GB579414A (en) * | 1941-10-15 | 1946-08-02 | Standard Telephones Cables Ltd | Improvements in or relating to electric wave filters |
FR899350A (en) * | 1942-11-06 | 1945-05-28 | Telefunken Gmbh | Improvements to tubular lines for very short waves |
NL217682A (en) * | 1942-12-31 | |||
GB579782A (en) * | 1943-01-08 | 1946-08-15 | Standard Telephones Cables Ltd | Phase changers |
DE871324C (en) * | 1943-02-07 | 1953-03-23 | Julius Pintsch K G | Arrangement to compensate for changes in impedance occurring at points of interference along ultra-high frequency transmission lines |
FR964835A (en) * | 1943-06-23 | 1950-08-25 | ||
US2543425A (en) * | 1945-06-14 | 1951-02-27 | Malcom W P Strandberg | Squeezable wave guide for line stretching |
FR950844A (en) * | 1945-06-19 | 1949-10-07 | Hazeltine Corp | Impedance matching device |
GB608494A (en) * | 1945-07-10 | 1948-09-16 | William Arthur Johnson | Improvements in and relating to the waveguide transmission of electromagnetic waves |
US2637813A (en) * | 1945-08-20 | 1953-05-05 | Rca Corp | Balanced microwave detector |
US2479673A (en) * | 1945-08-20 | 1949-08-23 | Rca Corp | Directional microwave transmission system having dielectric lens |
US2587590A (en) * | 1946-07-26 | 1952-03-04 | Sperry Corp | Ultrahigh-frequency apparatus |
NL72534C (en) * | 1948-04-26 | |||
GB655803A (en) * | 1948-08-30 | 1951-08-01 | Cossor Ltd A C | Improvements in and relating to transmission lines for radio-frequency electric oscillations |
US2710917A (en) * | 1948-09-14 | 1955-06-14 | Itt | Dual band antenna system |
US2784381A (en) * | 1948-10-05 | 1957-03-05 | Bell Telephone Labor Inc | Hybrid ring coupling arrangements |
GB670405A (en) * | 1949-04-22 | 1952-04-16 | British Thomson Houston Co Ltd | Means for controlling a member of great length for use with wave guides |
US2639325A (en) * | 1950-03-24 | 1953-05-19 | Bell Telephone Labor Inc | Hybrid ring |
DE821035C (en) * | 1950-09-10 | 1951-11-15 | Gutehoffnungshuette Oberhausen | Lock pocket for pit stamp |
BE518175A (en) * | 1951-05-23 | |||
US2721312A (en) * | 1951-06-30 | 1955-10-18 | Itt | Microwave cable |
NL176506B (en) * | 1952-03-05 | Fujitsu Ltd | GAS DISCHARGE DISPLAY DEVICE. | |
US2789210A (en) * | 1952-12-30 | 1957-04-16 | Sylvania Electric Prod | Mixing circuit for microwave frequencies |
-
0
- BE BE527584D patent/BE527584A/xx unknown
- BE BE519797D patent/BE519797A/xx unknown
- BE BE518176D patent/BE518176A/xx unknown
- BE BE533239D patent/BE533239A/xx unknown
-
1952
- 1952-12-06 US US324545A patent/US2859417A/en not_active Expired - Lifetime
-
1953
- 1953-01-23 GB GB2013/53A patent/GB726067A/en not_active Expired
- 1953-03-05 FR FR1072220D patent/FR1072220A/en not_active Expired
- 1953-05-01 GB GB12110/53A patent/GB761761A/en not_active Expired
- 1953-05-01 GB GB12111/53A patent/GB761762A/en not_active Expired
- 1953-05-01 GB GB12114/53A patent/GB761765A/en not_active Expired
- 1953-05-04 FR FR65725D patent/FR65725E/en not_active Expired
- 1953-05-04 FR FR65726D patent/FR65726E/fr not_active Expired
- 1953-05-06 FR FR66218D patent/FR66218E/en not_active Expired
- 1953-05-06 CH CH316574D patent/CH316574A/en unknown
- 1953-05-06 CH CH317717D patent/CH317717A/en unknown
- 1953-05-06 FR FR65729D patent/FR65729E/fr not_active Expired
- 1953-05-07 DE DEI7223A patent/DE1036950B/en active Pending
- 1953-05-07 DE DEI7225A patent/DE1042048B/en active Pending
- 1953-11-13 GB GB31595/53A patent/GB761778A/en not_active Expired
- 1953-12-01 FR FR66221D patent/FR66221E/en not_active Expired
-
1954
- 1954-03-19 GB GB8111/54A patent/GB749337A/en not_active Expired
- 1954-03-23 DE DEI8435A patent/DE1002828B/en active Pending
- 1954-03-24 FR FR66225D patent/FR66225E/en not_active Expired
- 1954-03-25 CH CH328921D patent/CH328921A/en unknown
- 1954-03-26 FR FR66227D patent/FR66227E/en not_active Expired
- 1954-10-01 FR FR68805D patent/FR68805E/en not_active Expired
- 1954-11-04 US US466753A patent/US2874276A/en not_active Expired - Lifetime
- 1954-11-12 FR FR68853D patent/FR68853E/en not_active Expired
-
1955
- 1955-01-07 FR FR69008D patent/FR69008E/en not_active Expired
-
1956
- 1956-02-17 FR FR69959D patent/FR69959E/en not_active Expired
- 1956-05-01 CH CH347233D patent/CH347233A/en unknown
- 1956-05-11 GB GB14706/56A patent/GB809482A/en not_active Expired
- 1956-05-11 FR FR70420D patent/FR70420E/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2153155A (en) * | 1984-01-24 | 1985-08-14 | Secr Defence | Improvements on or relating to microwave filters |
Also Published As
Publication number | Publication date |
---|---|
GB809482A (en) | 1959-02-25 |
BE527584A (en) | |
US2859417A (en) | 1958-11-04 |
DE1002828B (en) | 1957-02-21 |
CH317717A (en) | 1956-11-30 |
FR70420E (en) | 1959-05-06 |
GB726067A (en) | 1955-03-16 |
FR65726E (en) | 1956-03-12 |
CH328921A (en) | 1958-03-31 |
FR65729E (en) | 1956-03-12 |
FR66218E (en) | 1956-06-05 |
DE1042048B (en) | 1958-10-30 |
BE533239A (en) | |
FR1072220A (en) | 1954-09-09 |
FR65725E (en) | 1956-03-12 |
US2874276A (en) | 1959-02-17 |
DE1036950B (en) | 1958-08-21 |
BE519797A (en) | |
FR69959E (en) | 1959-01-30 |
CH316574A (en) | 1956-10-15 |
GB761761A (en) | 1956-11-21 |
FR66227E (en) | 1956-06-05 |
FR68805E (en) | 1958-06-10 |
GB761762A (en) | 1956-11-21 |
GB761765A (en) | 1956-11-21 |
CH347233A (en) | 1960-06-30 |
FR66225E (en) | 1956-06-05 |
FR68853E (en) | 1958-06-11 |
FR66221E (en) | 1956-06-05 |
FR69008E (en) | 1958-08-27 |
BE518176A (en) | |
GB749337A (en) | 1956-05-23 |
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