GB800923A - Improvements in or relating to frequency separating arrangements - Google Patents

Improvements in or relating to frequency separating arrangements

Info

Publication number
GB800923A
GB800923A GB13684/56A GB1368456A GB800923A GB 800923 A GB800923 A GB 800923A GB 13684/56 A GB13684/56 A GB 13684/56A GB 1368456 A GB1368456 A GB 1368456A GB 800923 A GB800923 A GB 800923A
Authority
GB
United Kingdom
Prior art keywords
frequency
filters
junction
frequencies
energy
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
Application number
GB13684/56A
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.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil SA
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
Application filed by CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
Publication of GB800923A publication Critical patent/GB800923A/en
Expired legal-status Critical Current

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
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies

Abstract

800,923. Frequency-separating networks. COMPAGNIE GENERALE DE TELEGRAPHIE SANS FIL. May 3, 1956 [May 18, 1955], No. 13684/56. Class 40 (8). A band-pass arrangement designed to separate a band of frequencies centred on a frequency #1 from a number of other adjacent bands centred on frequencies #2, #3 . . . #n comprises two magic-T junctions 8, 9 whose symmetrical arms 3, 4 and 3<SP>1</SP>, 4<SP>1</SP> are connected by waveguides of equal length containing bandpass filters, the waveguides and filters being so arranged and constructed that a path difference of one half wavelength (#g/2) exists between the portions of wave energy reflected by the filters over an extended range of frequencies. The input, comprising signals on channels #1, f2, #3 . . . #n, is applied to the H -arm 1 of the magic-T 9 where it is distributed equally between the symmetrical arms 3, 4. The filters F1,3 and F1,4 are tuned to a centre frequency #1 so that energy in this channel passes to the magic-T 8 and is coupled into the output arm 1<SP>1</SP>. Because of a difference of #g/4 in the electrical distances between the junction 9 and the filters F1,3, F1,4 a path difference of #g/2 exists between the portions of energy in channels f2, f3 ... #n, reflected back to the junction 9 and this energy is coupled into the E-arm 2 of the junction. If the waveguides 3, 4 were of identical cross-section the electrical length of the longer path would increase more rapidly with frequency than that of the shorter path. In order to ensure a constant path difference over the whole range of frequencies f2 ... #n the cut-off frequency of the guide 4 providing the shorter path is increased by fixing a metal insert 7 against one of its narrow walls. Alternatively, the cut-off frequency of the other guide 3 may be decreased by providing a ridge of metal on one of the broad faces. A combination of these two methods may be used. The branches 31, 41 of the junction 8 are similarly modified so that the circuit can be used for operation in both directions. Matching posts t are provided at the waveguide bends.
GB13684/56A 1955-05-18 1956-05-03 Improvements in or relating to frequency separating arrangements Expired GB800923A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1010592X 1955-05-18

Publications (1)

Publication Number Publication Date
GB800923A true GB800923A (en) 1958-09-03

Family

ID=9569148

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13684/56A Expired GB800923A (en) 1955-05-18 1956-05-03 Improvements in or relating to frequency separating arrangements

Country Status (3)

Country Link
DE (1) DE1010592B (en)
FR (1) FR1126607A (en)
GB (1) GB800923A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401995A2 (en) * 1989-06-09 1990-12-12 Hughes Aircraft Company Microwave diplexer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538958B1 (en) * 1982-12-30 1985-09-20 Thomson Csf MICROWAVE FILTER WITH TUNABLE FREQUENCY OF CUT AND ITS APPLICATION TO MICROWAVE MIXER AND RADAR OPERATING IN DIVERSITY MODE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401995A2 (en) * 1989-06-09 1990-12-12 Hughes Aircraft Company Microwave diplexer
EP0401995A3 (en) * 1989-06-09 1992-03-04 Hughes Aircraft Company Microwave diplexer

Also Published As

Publication number Publication date
FR1126607A (en) 1956-11-27
DE1010592B (en) 1957-06-19

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