US2760169A - Microwave filters - Google Patents

Microwave filters Download PDF

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Publication number
US2760169A
US2760169A US239795A US23979551A US2760169A US 2760169 A US2760169 A US 2760169A US 239795 A US239795 A US 239795A US 23979551 A US23979551 A US 23979551A US 2760169 A US2760169 A US 2760169A
Authority
US
United States
Prior art keywords
conductor
filter
line conductor
microwave
line
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 - Lifetime
Application number
US239795A
Other languages
English (en)
Inventor
Herbert F Engelmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Micronas GmbH
International Telephone and Telegraph Corp
Original Assignee
Deutsche ITT Industries GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE513061D priority Critical patent/BE513061A/xx
Priority to BE572608D priority patent/BE572608A/xx
Priority to BE518175D priority patent/BE518175A/xx
Priority to BE525572D priority patent/BE525572A/fr
Priority to BE525646D priority patent/BE525646A/xx
Priority to BE511583D priority patent/BE511583A/xx
Priority to NLAANVRAGE7512801,A priority patent/NL174931B/xx
Priority to NL91134D priority patent/NL91134C/xx
Priority to BE517377D priority patent/BE517377A/xx
Application filed by Deutsche ITT Industries GmbH filed Critical Deutsche ITT Industries GmbH
Priority to US239795A priority patent/US2760169A/en
Priority claimed from US280106A external-priority patent/US2773242A/en
Priority to GB10458/52A priority patent/GB704050A/en
Priority to FR64616D priority patent/FR64616E/fr
Priority to GB14956/52A priority patent/GB708597A/en
Priority to FR64854D priority patent/FR64854E/fr
Priority to FR64855D priority patent/FR64855E/fr
Priority to FR64857D priority patent/FR64857E/fr
Priority to FR64856D priority patent/FR64856E/fr
Priority to FR64858D priority patent/FR64858E/fr
Priority to GB17563/52A priority patent/GB712306A/en
Priority to FR65237D priority patent/FR65237E/fr
Priority to ES0204651A priority patent/ES204651A1/es
Priority to FR65459D priority patent/FR65459E/fr
Priority to FR65460D priority patent/FR65460E/fr
Priority to FR65461D priority patent/FR65461E/fr
Priority to CH316533D priority patent/CH316533A/fr
Priority to GB1338/53A priority patent/GB722660A/en
Priority to DEI6847A priority patent/DE1027266B/de
Priority to FR65468D priority patent/FR65468E/fr
Priority to CH320601D priority patent/CH320601A/fr
Priority to DEI6965A priority patent/DE963529C/de
Priority to CH310665D priority patent/CH310665A/de
Priority to FR65719D priority patent/FR65719E/fr
Priority to DEI7067A priority patent/DE958396C/de
Priority to FR65720D priority patent/FR65720E/fr
Priority to CH325319D priority patent/CH325319A/fr
Priority to FR66029D priority patent/FR66029E/fr
Priority to FR66165D priority patent/FR66165E/fr
Priority to FR66173D priority patent/FR66173E/fr
Priority to FR66172D priority patent/FR66172E/fr
Priority to FR66174D priority patent/FR66174E/fr
Priority to FR66175D priority patent/FR66175E/fr
Priority to FR67548D priority patent/FR67548E/fr
Priority to FR70153D priority patent/FR70153E/fr
Priority to FR70908D priority patent/FR70908E/fr
Priority to FR70910D priority patent/FR70910E/fr
Application granted granted Critical
Publication of US2760169A publication Critical patent/US2760169A/en
Priority to FR752549A priority patent/FR72524E/fr
Priority to FR778211A priority patent/FR74355E/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01P3/081—Microstriplines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/10—Auxiliary devices for switching or interrupting
    • H01P1/12—Auxiliary devices for switching or interrupting by mechanical chopper
    • H01P1/127—Strip line switches
    • 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
    • H01P1/2039—Galvanic coupling between Input/Output
    • 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
    • H01P5/12—Coupling devices having more than two ports
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/26—Surface waveguide constituted by a single conductor, e.g. strip conductor

Definitions

  • Microwave filters have heretofore required expensive conductor systems employing waveguides and coaxial lines. As technical development reached into higher frequencies, the precision requirements of these filters have become more exacting thereby rendering difficult the manufacture of satisfactory filters for microwave frequencies.
  • One of the objects of this invention is to provide a simplified form of microwave filter which does not require the precision and exactness of microwave filters heretofore believed necessary.
  • Another object of the invention is to provide a microwave filter that may employ as a part of the filter a wall of the chassis or other apparatus associated with the filter.
  • Still another object of the invention is to provide a microwave filter which is of a character readily adapted for the use of printed circuit techniques.
  • a further object is to provide microwave filter structures having low loss characteristics.
  • One of the features of the invention is. its utilization of a basic principle present in a theoretically perfect parallel line transmission system.
  • the principles involved are disclosed in the copending applications of D. D. Grieg and H. F. Engelmann, Serial No. 227,896, filed May 23, 1951, and Serial No. 234,503, filed June 30, 1951, now Patent No. 2,721,312.
  • the present invention utilizes this theoretically perfect parallel line principle without requiring the exact identity and spacing of two parallel, conductors.
  • the filters are composed of two closely spaced conductors with one of the conductors, hereinafter sometimes referred to as the ground conductor, which is wider than the other conductor, hereinafter sometimes referred to as the line conductor, so as to produce effect an image of the line conductor.
  • Another feature is the shaping of the ground conductor so as to trough the line conductor portions of the filter and thereby minimize radiating loss.
  • Fig. 1 is a plan view of a filter useful in explaining the principles of the invention
  • Fig. 3 is a plan view of a difierent form of filter
  • Fig. 4 is a plan view of still another form of filter
  • Fig. 5 is a cross-sectional view taken along line 55 of Fig. 4;
  • Fig. 6 is a plan view of :a multisection filter
  • Fig. 7 is a cross-sectional view taken 'along line 7-7 of Fig. 6;
  • Fig, 8 is a plan view of still another multiple section filter.
  • a filter is shown in accordance with the principles of this invention as comprising a first or line conductor 1 and a second or ground conductor 2 disposed in close parallel, spaced relation, the conductor 1 being supported by a layer of dielectric material 3 covering the conductor 2.
  • the conductor 2 preferably comprises a flat conductor presenting a plane surface above which the line conductor 1 is disposed.
  • the plane or ground conductor 2 is selected wide as compared to the line conductor 1 so that the electric field is concentrated between the opposite surface of the conductors.
  • the conductor 2 may comprise a wall of a chassis or a panel, or it may comprise a metallic coating on the layer of dielectric 3.
  • the conductor 1 may comprise conductive strips :applied by a die-stamping operation, or it may comprise conductive material applied by any one of a number circuit printed techniques.
  • the conductor 1 is selected in the embodiment of Fig. 1 substantially one-half wavelength, or a multiple thereof, of the mid-frequency of the microwave energy to be passed by the filter. Both ends 4 and 5 of the conductor strip 1 are connected directly to the ground conductor 2 as indicated at 6 in Fig. 2. At resonant condition the currents at the ends 4 and 5 are of maximum value, while the voltage is a maximum midway along the conductor strip 1.
  • An input connection 7 which may comprise a strip of conductive material supported on the layer of dielectric 3, is connected at a point 8 a selected distance from the end 4.
  • an output connection 9 is connected at a point 10. a similar selected distance from the end 5.
  • the points of connection 8 and 10 may be considerably varied depending upon the impedance match re* quired in the associated circuitry. The points 8 and 10, for example, may be chosen to provide any impedance ratio desired for the input and output conductors.
  • the length of the conductor 1 is selected substantially one-half wavelength of the frequency to be passed, it should be noted, however, that the filter will also pass frequencies which are integral multiples of this frequency.
  • a modified form of filter is shown, wherein the input connection 11 and output connection 12 are coupled to the conductor 1 by capacity.
  • the conductor 11, which may comprise a line conductor supported by insulation 3, is terminated in close, spaced relation to the line conductor 1 on one side, and the conductor of the output connection 12 is likewise disposed in close, spaced relation to the opposite side of the line conductor 1.
  • This capacitive coupling arrangement may be located in the mid-point along the conductor 1 where the voltage is a maximum, or they may be located at other selected points, opposed or staggered, along the conductor 1.
  • the magnitude of the capacity for coupling is inversely proportional to the spacing separating the coimections 11 and 12 from the conductor 1 and hence may also be altered by varying this spacing.
  • FIGs. 4 and 5 a similar filter arrangement is shown with the same type of capacitive coupling between the input and output connections 11, 12 and the conductive strip 13, The conductive strip 13, however, is selected.
  • the ground or plane conductor 15 is shown to have been grooved or etched to provide a trough 17, Fig. 5, in which a layer of dielectric material 18; is disposed so. as. to. support the conductive strip 13 and the input and output connections 11 and 12.
  • a layer of dielectric material 18 is disposed so. as. to. support the conductive strip 13 and the input and output connections 11 and 12.
  • Figs. 6 and 7 show a filter which comprises a plurality of filter sections similar to the embodiment of Fig. 3 coupled together in series relation. Two end filter sections 24 and 25 are shown, each section comprising a conduc- Patented Aug, 21, 1956.
  • tive strip 1 grounded at its ends 4 and 5 the same as shown in Fig. 3.
  • the grounded connection 6, however, is shown to be disposed in an enlarged opening 27 in the layer of dielectric 3 although the openings 27 need be only large enough to accommodate connection 6.
  • the input connection 28 is shown coupled by capacity by the spacing 29 similarly as in Fig. 3, and the output connection 30 is likewise coupled by capacity spacing to the conductor strip 1 of section 25. Adjacent sections are similarly coupled by a conductive strip 31 To minimize radiation losses laterally with respect to the conductor strips 1 and 31, upright conductive ridges 32 and 33 are disposed in close, spaced relation with the sides of the conductive strips 1, 31 and also with respect to the input and output connections 28 and 30.
  • These conductive ridges are connected to and made a part of the ground conductor 2. These ridges extend, preferably, at least as far from the plane surface of the conductor 2 as the conductor strip 1. In Fig. 7 these ridge conductors are shown to extend even further so as to substantially completely shield in lateral directions the spacing between the conductor strips and the ground conductor 2. At the input and output connections these conductive ridges are flared outwardly in horn fashion as indicated at 34 and 35 with respect to the line conductor, thereby minimizing perturbation of the microwave energy at the input and output connections.
  • the series filter shown in Fig. 8 illustrates 'a series connection for the type of filter coupling shown in Fig. 1.
  • a number of identical filter sections are indicated, the input section 36 having the input connection 37 directly connected to the conductor strip 1 thereof as indicated at 38.
  • the output section 39 is provided with an output connection 40 connected to the conductor 1 thereof as indicated at 41.
  • Adjacent sections are similarly connected directly as indicated by connecting links 42 and 43.
  • conductive ridges 44 and 45 are disposed along the line conductor portions which comprise the input connections, filter sections, and connecting strips substantially as shown, the conductive ridges being flared outwardly at the input and output connections.
  • filter sections of Figs. 6 and 8 are shown to be substantially equal in length, it will be clear that filter sections may be selected of different lengths, whereby selectivity may be obtained over a wide range of frequencies.
  • the length of the filter sections for example, may be chosen equal to half wavelengths of a number of different frequencies of a desired pass band.
  • the coupling between adjacent filter sections may either be by the direct coupling method, as indicated in Figs. 1 and 6, or by spaced capacitive coupling, as indicated in Figs. 3, 4 and 8.
  • a microwave filter comprising a layer of solid dielectric material, a conductor having a plane surface supported on one face of said layer, a line conductor supported on the other face of said layer in closely spaced parallel relation to said plane surface, said line conductor being of a length to form in conjunction with said plane surface a resonant section for the frequency energy to be passed, said plane surface being of dimensions greater than said line conductor so that said line conductor is entirely Within the confines of said plane surface and the spacing therebetween being such that at said frequency substantially the entire electric field distribution is concentrated between said line conductor and said plane surface in a manner substantially the same as the field distribution between one conductor and the neutral plane of a two-conductor parallel system, and coupling conductors supported on said other face of said layer of dielectric above said plane surface with the ends thereof coupled to said line conductor at points spaced from the ends of said line conductor.
  • a microwave filter according to claim 1 further including means conductively connecting at least one end of said line conductor to said plane surface.
  • a microwave filter comprising a layer of solid dielectric material, a conductor having a plane surf-ace supported on one face of said layer, a line conductor of ribbonlike form supported on the other face of said layer in closely spaced parallel relation to said plane surface, said line conductor being of a length to form in conjunction with said plane surface a resonant section for the frequency energy to be passed, said plane surface being of lateral dimensions greater than said line conductor so that said line conductor is entirely within the confines of said plane surface and the spacing therebetween being such that at said frequency substantially the entire electric field distribution is concentrated between said line conductor and said plane surface in a manner substantially the same as the field distribution between one conductor and the neutral plane of a two-conductor parallel system, coupling conductors supported on said other face of said layer of dielectric above said plane surface with the ends thereof coupled to said line conductor, said plane conductor having upright wall portions disposed laterally of said line conductor and said coupling conductors, said wall portions being of a height corresponding substantially to the spacing between said line

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguides (AREA)
  • Near-Field Transmission Systems (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US239795A 1951-05-23 1951-08-01 Microwave filters Expired - Lifetime US2760169A (en)

Priority Applications (47)

Application Number Priority Date Filing Date Title
BE513061D BE513061A (da) 1951-05-23
BE572608D BE572608A (da) 1951-05-23
BE518175D BE518175A (da) 1951-05-23
BE525572D BE525572A (da) 1951-05-23
BE525646D BE525646A (da) 1951-05-23
BE511583D BE511583A (da) 1951-05-23
NLAANVRAGE7512801,A NL174931B (nl) 1951-05-23 Wikkeldrager met evenwijdig aan de hartlijn verlopende draagelementen.
NL91134D NL91134C (da) 1951-05-23
BE517377D BE517377A (da) 1951-05-23
US239795A US2760169A (en) 1951-05-23 1951-08-01 Microwave filters
GB10458/52A GB704050A (en) 1951-05-23 1952-04-25 Radio frequency transmission system
FR64616D FR64616E (fr) 1951-05-23 1952-05-30 Système de transmission pour haute fréquence
GB14956/52A GB708597A (en) 1951-05-23 1952-06-13 Radio frequency filter
FR64854D FR64854E (fr) 1951-05-23 1952-06-17 Système de transmission pour haute fréquence
FR64855D FR64855E (fr) 1951-05-23 1952-06-20 Système de transmission pour haute fréquence
FR64857D FR64857E (fr) 1951-05-23 1952-06-27 Système de transmission pour haute fréquence
FR64856D FR64856E (fr) 1951-05-23 1952-06-27 Système de transmission pour haute fréquence
FR64858D FR64858E (fr) 1951-05-23 1952-07-04 Système de transmission pour haute fréquence
GB17563/52A GB712306A (en) 1951-05-23 1952-07-11 Microwave filters
FR65237D FR65237E (fr) 1951-05-23 1952-07-18 Système de transmission pour haute fréquence
ES0204651A ES204651A1 (es) 1951-08-01 1952-07-22 Un sistema de filtro microondas
FR65459D FR65459E (fr) 1951-05-23 1952-07-24 Système de transmission pour haute fréquence
FR65460D FR65460E (fr) 1951-05-23 1952-07-29 Système de transmission pour haute fréquence
FR65461D FR65461E (fr) 1951-05-23 1952-07-29 Système de transmission pour haute fréquence
CH316533D CH316533A (fr) 1951-05-23 1952-08-01 Filtre pour ondes ultra-courtes
GB1338/53A GB722660A (en) 1951-05-23 1953-01-16 Directional couplers for microwave transmission systems
DEI6847A DE1027266B (de) 1951-05-23 1953-01-28 Serien-Koppler fuer Mikrowellen mit Streifen- oder Bandleitung
FR65468D FR65468E (fr) 1951-05-23 1953-02-03 Système de transmission pour haute fréquence
CH320601D CH320601A (fr) 1951-05-23 1953-02-04 Dispositif de couplage de lignes de transmission pour haute fréquence
DEI6965A DE963529C (de) 1951-05-23 1953-03-01 Richtungskoppler fuer Bandleitungen
CH310665D CH310665A (de) 1951-05-23 1953-03-05 Richtungskopplungsvorrichtung für eine Mikrowellen-Übertragungsanlage.
FR65719D FR65719E (da) 1951-05-23 1953-03-23
DEI7067A DE958396C (de) 1951-05-23 1953-03-27 Anordnung zur Kopplung von Mikrowellenbandleitungen mit Hohlraumresonatoren
FR65720D FR65720E (da) 1951-05-23 1953-04-01
CH325319D CH325319A (fr) 1951-05-23 1953-04-01 Dispositif de transmission d'ondes ultra-courtes
FR66029D FR66029E (da) 1951-05-23 1953-10-20
FR66165D FR66165E (fr) 1951-05-23 1953-10-27 Système de transmission pour haute fréquence
FR66173D FR66173E (fr) 1951-05-23 1954-01-07 Système de transmission pour haute fréquence
FR66172D FR66172E (fr) 1951-05-23 1954-01-07 Système de transmission pour haute fréquence
FR66174D FR66174E (fr) 1951-05-23 1954-01-08 Système de transmission pour haute fréquence
FR66175D FR66175E (fr) 1951-05-23 1954-02-02 Système de transmission pour haute fréquence
FR67548D FR67548E (fr) 1951-05-23 1955-02-08 Système de transmission pour haute fréquence
FR70153D FR70153E (fr) 1951-05-23 1955-03-10 Système de transmission pour haute fréquence
FR70908D FR70908E (fr) 1951-05-23 1955-10-11 Système de transmission pour haute fréquence
FR70910D FR70910E (fr) 1951-05-23 1955-12-09 Système de transmission pour haute fréquence
FR752549A FR72524E (fr) 1951-05-23 1957-11-27 Système de transmission pour haute fréquence
FR778211A FR74355E (fr) 1951-05-23 1958-10-31 Système de transmission pour haute fréquence

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US704050XA 1951-05-23 1951-05-23
US239795A US2760169A (en) 1951-05-23 1951-08-01 Microwave filters
US310665XA 1952-03-05 1952-03-05
US280106A US2773242A (en) 1952-04-02 1952-04-02 Microwave switching arrangements

Publications (1)

Publication Number Publication Date
US2760169A true US2760169A (en) 1956-08-21

Family

ID=27487866

Family Applications (1)

Application Number Title Priority Date Filing Date
US239795A Expired - Lifetime US2760169A (en) 1951-05-23 1951-08-01 Microwave filters

Country Status (7)

Country Link
US (1) US2760169A (da)
BE (5) BE511583A (da)
CH (4) CH316533A (da)
DE (3) DE1027266B (da)
FR (7) FR65459E (da)
GB (4) GB704050A (da)
NL (2) NL91134C (da)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822525A (en) * 1952-05-08 1958-02-04 Itt High frequency hybrid circuit
US2859417A (en) * 1952-05-08 1958-11-04 Itt Microwave filters
US2867782A (en) * 1955-05-13 1959-01-06 Itt Microwave lines and high q filters
US2892163A (en) * 1956-10-05 1959-06-23 Itt Band-pass filters
US2915716A (en) * 1956-10-10 1959-12-01 Gen Dynamics Corp Microstrip filters
US2942150A (en) * 1957-05-29 1960-06-21 Columbia Broadcasting Syst Inc Television picture display apparatus
US2945195A (en) * 1958-03-25 1960-07-12 Thompson Ramo Wooldridge Inc Microwave filter
US2984802A (en) * 1954-11-17 1961-05-16 Cutler Hammer Inc Microwave circuits
US3076862A (en) * 1960-10-20 1963-02-05 Rca Corp Circuit supporting apparatus
US3093805A (en) * 1957-07-26 1963-06-11 Osifchin Nicholas Coaxial transmission line
US3105947A (en) * 1960-03-11 1963-10-01 Cossor Ltd A C Wavemeter having strip-line resonator capacitively coupled to feed, with movable dielectric effectively varying resonator length
US3668569A (en) * 1970-05-27 1972-06-06 Hazeltine Corp Distributed-constant dispersive network
US3771075A (en) * 1971-05-25 1973-11-06 Harris Intertype Corp Microstrip to microstrip transition
US4131894A (en) * 1977-04-15 1978-12-26 Ball Corporation High efficiency microstrip antenna structure
US4692724A (en) * 1985-10-21 1987-09-08 E-Systems, Inc. High power tunable filter
US5164358A (en) * 1990-10-22 1992-11-17 Westinghouse Electric Corp. Superconducting filter with reduced electromagnetic leakage
EP0589704A1 (en) * 1992-09-24 1994-03-30 Matsushita Electric Industrial Co., Ltd. Microwave filter
FR2885735A1 (fr) * 2005-05-10 2006-11-17 St Microelectronics Sa Circuit integre guide d'ondes
US20080252400A1 (en) * 2005-09-29 2008-10-16 Kabushiki Kaisha Toshiba Filter and radio communication device using the same

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Publication number Priority date Publication date Assignee Title
DE963528C (de) * 1954-11-13 1957-05-09 Lorenz C Ag Abstimmanordnung unter Verwendung von nach Art der gedruckten Schaltungen ausgebildeten unsymmetrischen Mikrowellenbandleitungen
US2901709A (en) * 1954-12-14 1959-08-25 Gen Electric Wave coupling arrangement
DE1269209B (de) * 1961-02-16 1968-05-30 Siemens Ag Ringleitung, bestehend aus Leitungsbahnen von insgesamt 6/4 lambda Laenge
US3209284A (en) * 1963-06-05 1965-09-28 Charles O Hast Termination for strip transmission lines
US3450902A (en) * 1966-03-21 1969-06-17 Hewlett Packard Co Structure for reducing mismatch between symmetrical and asymmetrical transmission line and fast rise time generator utilizing same
EP0617478B1 (en) * 1993-03-25 1998-07-29 Matsushita Electric Industrial Co., Ltd. Laminated dielectric resonator and dielectric filter
DE19805911A1 (de) * 1998-02-13 1999-08-19 Cit Alcatel Übergang von einer Mikrostripleitung zu einem Hohlleiter sowie Verwendung eines solchen Übergangs

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US2274346A (en) * 1938-01-27 1942-02-24 Telefunken Gmbh Frequency selective transmission line
US2410656A (en) * 1943-06-24 1946-11-05 Rca Corp Tuned ultra high frequency transformer
US2411555A (en) * 1941-10-15 1946-11-26 Standard Telephones Cables Ltd Electric wave filter
US2432057A (en) * 1944-06-23 1947-12-02 Hazeltine Research Inc Wave-signal antenna
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US2611822A (en) * 1945-02-03 1952-09-23 Bliss William Roderic Coupling device
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GB568378A (en) * 1940-05-03 1945-04-03 Ferranti Ltd Improvements in or relating to transmission lines for ultra high radio frequencies
GB607200A (en) * 1943-11-29 1948-08-26 British Thomson Houston Co Ltd Improvements in and relating to radio frequency coupling arrangements
US2580679A (en) * 1946-08-16 1952-01-01 Sperry Corp High-frequency directional coupler apparatus

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US2859417A (en) * 1952-05-08 1958-11-04 Itt Microwave filters
US2822525A (en) * 1952-05-08 1958-02-04 Itt High frequency hybrid circuit
US2984802A (en) * 1954-11-17 1961-05-16 Cutler Hammer Inc Microwave circuits
US2867782A (en) * 1955-05-13 1959-01-06 Itt Microwave lines and high q filters
US2892163A (en) * 1956-10-05 1959-06-23 Itt Band-pass filters
US2915716A (en) * 1956-10-10 1959-12-01 Gen Dynamics Corp Microstrip filters
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US2945195A (en) * 1958-03-25 1960-07-12 Thompson Ramo Wooldridge Inc Microwave filter
US3105947A (en) * 1960-03-11 1963-10-01 Cossor Ltd A C Wavemeter having strip-line resonator capacitively coupled to feed, with movable dielectric effectively varying resonator length
US3076862A (en) * 1960-10-20 1963-02-05 Rca Corp Circuit supporting apparatus
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US4131894A (en) * 1977-04-15 1978-12-26 Ball Corporation High efficiency microstrip antenna structure
US4692724A (en) * 1985-10-21 1987-09-08 E-Systems, Inc. High power tunable filter
US5164358A (en) * 1990-10-22 1992-11-17 Westinghouse Electric Corp. Superconducting filter with reduced electromagnetic leakage
EP0589704A1 (en) * 1992-09-24 1994-03-30 Matsushita Electric Industrial Co., Ltd. Microwave filter
US5461352A (en) * 1992-09-24 1995-10-24 Matsushita Electric Industrial Co., Ltd. Co-planar and microstrip waveguide bandpass filter
CN1050703C (zh) * 1992-09-24 2000-03-22 松下电器产业株式会社 带通滤波器
FR2885735A1 (fr) * 2005-05-10 2006-11-17 St Microelectronics Sa Circuit integre guide d'ondes
US20060270210A1 (en) * 2005-05-10 2006-11-30 Stmicroelectronics S.A. Waveguide integrated circuit
US7417262B2 (en) 2005-05-10 2008-08-26 Stmicroelectronics S.A. Waveguide integrated circuit
US20080252400A1 (en) * 2005-09-29 2008-10-16 Kabushiki Kaisha Toshiba Filter and radio communication device using the same

Also Published As

Publication number Publication date
FR70153E (fr) 1959-02-19
FR65461E (fr) 1956-02-21
FR67548E (fr) 1958-03-13
CH316533A (fr) 1956-10-15
BE518175A (da)
BE511583A (da)
FR70910E (fr) 1959-09-30
DE1027266B (de) 1958-04-03
CH320601A (fr) 1957-03-31
BE513061A (da)
CH310665A (de) 1955-10-31
BE572608A (da)
BE517377A (da)
DE958396C (de) 1957-02-21
DE963529C (de) 1957-05-09
NL174931B (nl)
FR65719E (da) 1956-03-12
FR65468E (fr) 1956-02-21
NL91134C (da)
GB704050A (en) 1954-02-17
GB708597A (en) 1954-05-05
GB722660A (en) 1955-01-26
FR65459E (fr) 1956-02-21
GB712306A (en) 1954-07-21
CH325319A (fr) 1957-10-31

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