GB532619A - Wave transmission networks - Google Patents

Wave transmission networks

Info

Publication number
GB532619A
GB532619A GB25696/39A GB2569639A GB532619A GB 532619 A GB532619 A GB 532619A GB 25696/39 A GB25696/39 A GB 25696/39A GB 2569639 A GB2569639 A GB 2569639A GB 532619 A GB532619 A GB 532619A
Authority
GB
United Kingdom
Prior art keywords
frequency
length
line
resonant
transmitter
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
GB25696/39A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB532619A publication Critical patent/GB532619A/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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • 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
    • H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source

Abstract

532,619. Impedance networks ; duplex wireless signalling. STANDARD TELEPHONES & CABLES, Ltd. Sept. 13, 1939, No. 25696. Convention date, Nov. 5, 1938. [Classes 40 (:iii) and 40 (v)] A network for passing a frequency f1 and suppressing a frequency f 2 comprises a series portion, e.g. a (2n-1) #/4 length of line introducing a 90 degrees phase shift at the frequency to be suppressed and a pair of shunt elements each of which is resonant at the frequency to be suppressed and antiresonant at the frequency to be passed. Where f 1 is less than f 2 the shunt impedances may have the forms shown in Figs. 5 to 8 and where f is greater than f 2 they may have the forms shown in Figs. 11 to 14. In Figs. 7 and 13 elements 31, 42 are provided to give an impedance transforming effect. In Figs. 8 and 14 use is made of a.length of transmission line as an impedance element. Instead of any one of these forms the corresponding inverse form may be connected up through a series element, e.g. a length of line introducing a 90 degrees phase shift at both the frequencies concerned. Several sections may be used in series. Where networks are to be connected in parallel they are terminated at the parallelconnected ends in a section of line which is an odd multiple of <SP>#</SP> 4 of the wave to be suppressed. The invention may be used for associating two or more receivers or transmitters with a common aerial. As shown in Fig. 20 however the aerial A is common to a transmitter 56 and receiver 57. The receiving branch includes two line sections of length (2n-1) <SP>#T</SP> 4 where # T is the transmitter wavelength and two shunt elements Z2 resonant at the transmitter frequency and anti-resonant at the receiver frequency. The transmitter branch includes two line sections of length (2n-1) #R/4, where #R/4 is the receiver wave length and shunt impedance Z1 which is resonant at the receiver frequency and anti-resonant at the transmitter frequency and an impedance Z2 which is the reverse of Z1 and is connected up through a length of line such as to introduce a 90 degrees phase shift at both frequencies.
GB25696/39A 1938-11-05 1939-09-13 Wave transmission networks Expired GB532619A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US238965A US2258974A (en) 1938-11-05 1938-11-05 Wave transmission network

Publications (1)

Publication Number Publication Date
GB532619A true GB532619A (en) 1941-01-28

Family

ID=22900064

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25696/39A Expired GB532619A (en) 1938-11-05 1939-09-13 Wave transmission networks

Country Status (2)

Country Link
US (1) US2258974A (en)
GB (1) GB532619A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302133A (en) * 1961-01-03 1967-01-31 Telefunken Patent Circuit
EP0367061A2 (en) * 1988-10-31 1990-05-09 Motorola, Inc. Ceramic filter having integral phase shifting network
WO1997010621A1 (en) * 1995-09-11 1997-03-20 Qualcomm Incorporated Dual-band antenna system

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512704A (en) * 1943-12-06 1950-06-27 Int Standard Electric Corp Arrangement for coupling wide frequency band antennae to transmission lines
US2636085A (en) * 1945-09-05 1953-04-21 Lawrence W Boothby Frequency determining device
GB655146A (en) * 1948-10-01 1951-07-11 Emi Ltd Improvements relating to electrical-wave band pass circuits
US2699548A (en) * 1949-12-31 1955-01-11 Motorola Inc Wave guide structure for microwave radio systems
US2713152A (en) * 1950-06-28 1955-07-12 Rca Corp Vestigial side band filter
DE1217001B (en) * 1952-10-27 1966-05-18 Siemens Ag Bandpass filter for very short electromagnetic waves
CH394422A (en) * 1962-01-31 1965-06-30 Patelhold Patentverwertung Five-part band filter in the output of a power stage
US3416101A (en) * 1965-05-03 1968-12-10 Sylvania Electric Prod Variable attenuator
US3412348A (en) * 1965-05-03 1968-11-19 Sylvania Electric Prod Variable attenuator
US3522556A (en) * 1965-10-23 1970-08-04 Sylvania Electric Prod Variable attenuator
US3656162A (en) * 1969-09-19 1972-04-11 Litton Systems Inc Diplexer for radio communication
US4287602A (en) * 1972-11-28 1981-09-01 Corporation For Public Broadcasting Rejection filter to remove TV channel 6 and FM radio interference
DE4129011A1 (en) * 1991-08-31 1993-03-04 Telefunken Systemtechnik Transmission appts. with several transmitters, e.g for ship or aircraft - has frequency selector and common aerial with various transmitters tunable to same or at least overlapping frequency ranges
JP2008270876A (en) * 2007-04-16 2008-11-06 Alps Electric Co Ltd Antenna system
US20100151113A1 (en) * 2008-12-12 2010-06-17 Microchips, Inc. Manufacture of a radiating structure for a medical implant
US8285387B2 (en) * 2008-12-12 2012-10-09 Microchips, Inc. Wireless communication with a medical implant

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302133A (en) * 1961-01-03 1967-01-31 Telefunken Patent Circuit
EP0367061A2 (en) * 1988-10-31 1990-05-09 Motorola, Inc. Ceramic filter having integral phase shifting network
EP0367061A3 (en) * 1988-10-31 1991-01-16 Motorola, Inc. Ceramic filter having integral phase shifting network
WO1997010621A1 (en) * 1995-09-11 1997-03-20 Qualcomm Incorporated Dual-band antenna system
US5652599A (en) * 1995-09-11 1997-07-29 Qualcomm Incorporated Dual-band antenna system

Also Published As

Publication number Publication date
US2258974A (en) 1941-10-14

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