US2982961A - Dual feed antenna - Google Patents

Dual feed antenna Download PDF

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Publication number
US2982961A
US2982961A US647457A US64745757A US2982961A US 2982961 A US2982961 A US 2982961A US 647457 A US647457 A US 647457A US 64745757 A US64745757 A US 64745757A US 2982961 A US2982961 A US 2982961A
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Prior art keywords
energy
radar
feed
identification
feedhorn
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Expired - Lifetime
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US647457A
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Calvin C Jones
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Calvin C Jones
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/001Crossed polarisation dual antennas
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/28Combinations of substantially independent non-interacting antenna units or systems
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/45Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device

Description

y 2, 1961 c. c. JONES 2,982,961

DUAL FEED ANTENNA Filed March 20, 1957 IN V EN TOR.

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DUAL FEED ANTENNA Calvin C. Jones, Jessup, Md., assignor, by mesne assignments, to the United States of America as represented by the Secretary of the Air Force Filed Mar. 20, 1957, Ser. No. 647,457

2 Claims. (Cl. 343-840) This invention relates to a dual feed antenna system I wherein a radar antenna system which radiates and receives horizontally polarized energy is modified by adding an Identification Friend or Foe feed which radiates and receives vertically polarized energy. The Identification Friend or Foe feed shall hereafter be referred to as the identification feed.

The object of the invention is to provide an identification feed system at the focal point of a radar reflector with parasitic reflectors, for the identification dipole elements, that do not affect the operation of the radar system.

This and other objects are accomplished by providing vertical slats as the parasitic reflecting elements, which intercept the vertically polarized identification energy but do not aifect the horizontally polarized radar energy.

In the drawing,

Fig. 1 is a side view of the dual feed system together with the modified reflector.

Fig. 2 is a front view of the modified reflector.

Fig. 3 is a side view showing the radar feedhorn and the identification feed.

Fig. 4 is a top view of the radar feedhorn with the identification feed attached thereto.

Referring more particularly to Fig. 1, reference numeral 10 refers to a radar reflectorhaving a parabolic section 11, a barrel section 12 and a plurality of horizontal slats 13 for reflecting horizontally polarized radar energy. The reflector was modified to reflect vertically polarized identification energy by adding a plurality of vertical slats 14.

Beam shaping antennas having a parabolic section and a barrel section are well known in the art. One such antenna is shown in Figs. 13-17 on page 484 of volume 12 of the MIT Radiation Laboratory Series.

The antenna system has a radar feedhorn 15 and an identification feed system 16 located at the focal point of the reflector 10, with the identification feed attached to the feedhorn 15.

An identification feed consisting of two dipoles with metal plates for parasitic reflectors was first tried. Since the focal point of the return energy from the barrel section is also the focal point for the parabolic section, an energy field of high intensity results in this region. The metal plates intercepted a considerable amount of the radar beam'energy. This eflfect was eliminated in a man- United States Patent 2,982,961 Patented May 2, 1961 ner which will be explained with reference to Figs. 3 and 4.

In Figs 3 and 4, the reflecting elements 17 and 18 for dipoles 19 and 20 consist of a plurality of vertical slats 21 and 22, respectively. When vertical slats are substituted for the reflecting plates, they intercept the vertically polarized identification energy, but do not intercept the horizontally polarized radar energy. The identification feed is attached to the radar feedhorn by means of plates 23 and 24.

There is thus provided a dual feed system wherein the detrimental efiect of the dipole parasitic reflectors is greatly reduced, if not eliminated entirely.

While a certain embodiment of the invention has been described in some detail, it will be understood that numerous changes may be made without departing from the general principles and scope of the invention.

What is claimed is:

1. An antenna system comprising reflecting means for reflecting energy in two planes of polarization which are displaced 90 from each other, said reflecting means having a focal point, a radar feedhorn located at said focal point for receiving and radiating energy in one of said planes of polarization, an identification feed located at said focal point and mounted on the external surface of said said radar feedhorn for receiving and radiating energy in the other of said planes of polarization, said identification feed comprising two dipole elements and two parasitic reflectors, each of said dipole elements being adjacent to and carried by one of said parasitic reflectors, said parasitic reflectors being mounted on opposite sides of said radar feedhorn, each of said parasitic reflectors consisting of a plurality of parallel slats for directing energy from said dipole elements toward said reflecting means.

2. The system of claim 1, wherein said radar feedhorn receives and radiates energy in a horizontal plane of polarization and said edntification feed receives and radiates energy in a vertical plane of polarization.

References Cited in the file of this patent UNITED STATES PATENTS 2,216,707 George Oct. 1, 1940 2,398,096 Katzin Apr. 9, 1946 2,430,568 Hershberger Nov. 11, 1947 2,441,574 Jaynes May 18, 1948 2,669,658 Jackson Feb. 16, 1954 2,691,731 Miller Oct. 12, 1954 2,753,551 Richmond July 3, 1956 2,820,965 Sichak Jan. 21, 1958 FOREIGN PATENTS 399,770 Great Britain Oct. 12, 1933 409,116 Italy Feb. 1, 1945 OTHER REFERENCES MIT Radiation Laboratory Series, vol 12, Microwave Antenna Theory and Design, by Silver, 1949.

US647457A 1957-03-20 1957-03-20 Dual feed antenna Expired - Lifetime US2982961A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3483563A (en) * 1965-10-13 1969-12-09 Collins Radio Co Combination vertically-horizontally polarized paracylinder antennas
US4001836A (en) * 1975-02-28 1977-01-04 Trw Inc. Parabolic dish and method of constructing same
EP0024808A1 (en) * 1979-08-23 1981-03-11 The Marconi Company Limited Dual frequency aerial feed arrangements
EP0045254A1 (en) * 1980-07-29 1982-02-03 Thomson-Csf Compact dual-frequency microwave feed
US4405928A (en) * 1980-03-17 1983-09-20 Harris Corporation Wind load reduction in tower mounted broadcast antennas
US4757323A (en) * 1984-07-17 1988-07-12 Alcatel Thomson Espace Crossed polarization same-zone two-frequency antenna for telecommunications satellites
US5003321A (en) * 1985-09-09 1991-03-26 Sts Enterprises, Inc. Dual frequency feed

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB399770A (en) * 1932-09-16 1933-10-12 Meaf Mach En Apparaten Fab Nv Improvements in and relating to a reflector device for electromagnetic radiation of ultra short wave length
US2216707A (en) * 1938-03-30 1940-10-01 Roscoe H George Electronic indicating system
US2398096A (en) * 1940-12-12 1946-04-09 Rca Corp Two frequency electromagnetic horn radiator
US2430568A (en) * 1942-06-22 1947-11-11 Rca Corp Antenna system
US2441574A (en) * 1944-02-29 1948-05-18 Sperry Corp Electromagnetic wave guide
US2669658A (en) * 1951-07-02 1954-02-16 Westinghouse Electric Corp Phase correction of asymmetric dual feed horns
US2691731A (en) * 1951-02-21 1954-10-12 Westinghouse Electric Corp Feed horn
US2753551A (en) * 1951-06-20 1956-07-03 Raytheon Mfg Co Circularly polarized radio object locating system
US2820965A (en) * 1956-02-16 1958-01-21 Itt Dual polarization antenna

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB399770A (en) * 1932-09-16 1933-10-12 Meaf Mach En Apparaten Fab Nv Improvements in and relating to a reflector device for electromagnetic radiation of ultra short wave length
US2216707A (en) * 1938-03-30 1940-10-01 Roscoe H George Electronic indicating system
US2398096A (en) * 1940-12-12 1946-04-09 Rca Corp Two frequency electromagnetic horn radiator
US2430568A (en) * 1942-06-22 1947-11-11 Rca Corp Antenna system
US2441574A (en) * 1944-02-29 1948-05-18 Sperry Corp Electromagnetic wave guide
US2691731A (en) * 1951-02-21 1954-10-12 Westinghouse Electric Corp Feed horn
US2753551A (en) * 1951-06-20 1956-07-03 Raytheon Mfg Co Circularly polarized radio object locating system
US2669658A (en) * 1951-07-02 1954-02-16 Westinghouse Electric Corp Phase correction of asymmetric dual feed horns
US2820965A (en) * 1956-02-16 1958-01-21 Itt Dual polarization antenna

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3483563A (en) * 1965-10-13 1969-12-09 Collins Radio Co Combination vertically-horizontally polarized paracylinder antennas
US4001836A (en) * 1975-02-28 1977-01-04 Trw Inc. Parabolic dish and method of constructing same
EP0024808A1 (en) * 1979-08-23 1981-03-11 The Marconi Company Limited Dual frequency aerial feed arrangements
US4405928A (en) * 1980-03-17 1983-09-20 Harris Corporation Wind load reduction in tower mounted broadcast antennas
EP0045254A1 (en) * 1980-07-29 1982-02-03 Thomson-Csf Compact dual-frequency microwave feed
US4757323A (en) * 1984-07-17 1988-07-12 Alcatel Thomson Espace Crossed polarization same-zone two-frequency antenna for telecommunications satellites
US5003321A (en) * 1985-09-09 1991-03-26 Sts Enterprises, Inc. Dual frequency feed

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