GB892813A - Improvements relating to transmission apparatus including waveguide aerials - Google Patents

Improvements relating to transmission apparatus including waveguide aerials

Info

Publication number
GB892813A
GB892813A GB17274/57A GB1727457A GB892813A GB 892813 A GB892813 A GB 892813A GB 17274/57 A GB17274/57 A GB 17274/57A GB 1727457 A GB1727457 A GB 1727457A GB 892813 A GB892813 A GB 892813A
Authority
GB
United Kingdom
Prior art keywords
array
pulse
slots
energy
main lobe
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
GB17274/57A
Inventor
Trevor Gordon Hame
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB17274/57A priority Critical patent/GB892813A/en
Priority to US738204A priority patent/US3007166A/en
Publication of GB892813A publication Critical patent/GB892813A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • H01Q21/0037—Particular feeding systems linear waveguide fed arrays
    • H01Q21/0043—Slotted waveguides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
    • G01S7/034—Duplexers

Abstract

892,813. Aerials; radar. ELECTRIC & MUSICAL INDUSTRIES Ltd. May 22, 1958 [May 31, 1957], No. 17274/57. Class 40(7). The invention is concerned with transmission apparatus for radio frequency pulse energy consisting of an array of slots cut in a waveguide which is coupled at. one end to the pulse-modulated energy source. According to the invention the aperture of the array is chosen in accordance with the duration of the pulses and the direction of the axis of the main lobe of the radiation pattern relative to the array. It is noted that, at the commencement of a pulse, energy takes a finite time to travel along the waveguide and energize the slots of the array. Between the start of the pulse and the time when the slot furthest from the feeder is energized a varying number of slots are operative and the radiation pattern and power radiated in the main lobe is varying. A similar effect occurs at the end of each pulse and if the time taken for energy to travel from one end of the array to the other (t a ) exceeds the pulse length (t p ) at no time are all the slots radiating and the main lobe power is reduced relative to operation when t a # t p . If the main lobe is not perpendicular to the axis of the array this simple explanation has to be modified to take into account the angle the wavefront makes with the array axis. To achieve the most effective transmission of energy it is proposed to make the delay time between energy travelling to the same wavefront in the direction of the axis of the main lobe via the two extreme slots of the array lie between the pulse duration and a value not substantially less than half the pulse duration. If the slot array is used also for reception of the transmitted pulses, as in pulse radar apparatus, the pulses transmitted are altered in shape due to the time taken to gradually energize and stop energizing all the slots in the array and the reflected pulses suffer a similar change in shape on reception and before being passed to the receiver. In these circumstances it is preferred to make the delay time specified above not greater than half the pulse duration. Fig. 11 of the drawings shows a suitable radar slot array in which the slotted waveguide is terminated in an absorber 5.
GB17274/57A 1957-05-31 1957-05-31 Improvements relating to transmission apparatus including waveguide aerials Expired GB892813A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB17274/57A GB892813A (en) 1957-05-31 1957-05-31 Improvements relating to transmission apparatus including waveguide aerials
US738204A US3007166A (en) 1957-05-31 1958-05-27 Slot aerial

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB17274/57A GB892813A (en) 1957-05-31 1957-05-31 Improvements relating to transmission apparatus including waveguide aerials

Publications (1)

Publication Number Publication Date
GB892813A true GB892813A (en) 1962-03-28

Family

ID=10092327

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17274/57A Expired GB892813A (en) 1957-05-31 1957-05-31 Improvements relating to transmission apparatus including waveguide aerials

Country Status (2)

Country Link
US (1) US3007166A (en)
GB (1) GB892813A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169145A (en) * 1984-12-27 1986-07-02 Decca Ltd Method of providing a scanning radio beam
GB2208969A (en) * 1987-08-18 1989-04-19 Arimura Inst Technology Slot antenna

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234558A (en) * 1962-09-26 1966-02-08 Selenia Ind Elettroniche Radar antenna consisting of a linear source with its directivity in a plane at rightangles to the line, obtained by a dielectric structure

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523455A (en) * 1944-05-30 1950-09-26 Philco Corp Object locating system
US2573746A (en) * 1945-09-19 1951-11-06 Honorary Advisory Council Sci Directive antenna for microwaves
US2730717A (en) * 1951-04-18 1956-01-10 Katchky Max Directional wave antenna for marine radar use
GB741994A (en) * 1952-08-20 1955-12-14 Ernest Mark Field A device for spreading liquid adhesives
US2908905A (en) * 1957-04-30 1959-10-13 Gen Precision Lab Inc Microwave antenna array

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169145A (en) * 1984-12-27 1986-07-02 Decca Ltd Method of providing a scanning radio beam
GB2208969A (en) * 1987-08-18 1989-04-19 Arimura Inst Technology Slot antenna
GB2208969B (en) * 1987-08-18 1992-04-01 Arimura Inst Technology Slot antenna

Also Published As

Publication number Publication date
US3007166A (en) 1961-10-31

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