US2774967A - Balanced doublet antenna of small dimension - Google Patents

Balanced doublet antenna of small dimension Download PDF

Info

Publication number
US2774967A
US2774967A US128332A US12833249A US2774967A US 2774967 A US2774967 A US 2774967A US 128332 A US128332 A US 128332A US 12833249 A US12833249 A US 12833249A US 2774967 A US2774967 A US 2774967A
Authority
US
United States
Prior art keywords
antenna
dipole
balanced
resonator
plates
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
US128332A
Other languages
English (en)
Inventor
Frank J Lundburg
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 BE499425D priority Critical patent/BE499425A/xx
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Priority to US128332A priority patent/US2774967A/en
Priority to GB18895/50A priority patent/GB677860A/en
Priority to CH298003D priority patent/CH298003A/fr
Priority to FR1027809D priority patent/FR1027809A/fr
Application granted granted Critical
Publication of US2774967A publication Critical patent/US2774967A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems
    • H01Q3/14—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying the relative position of primary active element and a refracting or diffracting device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators

Definitions

  • This invention relates to radio antennas and more particularly to antennas made of small dimensions.
  • antennas For convenience of construction and installation it is often desirable to have antennas made of small dimensions. This is particularly desirable when an antenna of directive characteristics is wanted, as the small construction makes physical rotation at relatively high speed practical. A difficulty arises however in the use of antennas having a length short with respect to a wave length. Such antennas have a generally low radiation resistance and so are not matched with the transmission line, thus resulting in inefliciency of operation.
  • I provide an antenna of relatively small dimensions, for example, a dipole in the order of from one to three-tenths overall wave-lengths, and supply about the antenna a loading resonator effectively open about one planar dimension of the antenna to provide a substantial impedance match between the antenna and the transmission line.
  • the resonator may comprise an open wire cage made of rods perpendicular to the plane of polarization of the antenna covered at the top and bottom with plane conductive sheets.
  • the antenna may be rotated within the cage resonator construction.
  • a dipole antenna 1 supplied with energy over a coupler 2, connected to a feed line 3.
  • Conductive plates 4 and 5 are spaced below and above dipole antenna 1, and these plates are interconnected by the rods 6, fastened to plates 4 and 5 to provide mechanical separation and electrical connection thereto.
  • a rotary mounting may be provided as shown at 7 so that the antenna may be rotated independently of the resonator.
  • the length of the dipole antenna may be of any desired length preferably between one twentieth and three tenths wave lengths.
  • the plates and connecting wires form a cavity resonator which serves to raise the impedance of the antenna assembly to produce an elfective match between the radiating structure and the ether.
  • the tie rods are closely enough spaced to form effectively a closed resonator and a polarizing grating to filter the vertically polarized components. Horizontally polarized energy, however, readily passes out around the periphery. While the assembly is completely matched at only one frequency, it is efiective over a relatively wide band with permissible mismatch.
  • the principles of the invention may be achieved by other structures.
  • the dimensions of the resonator may vary widely, it being borne in mind that the essential feature is to provide a loading resonator for the short dipole to elfect a desired impedance transformation.
  • any particular structure will have an optimum effect at the center frequency it is to be understood that the efiective tolerence of mismatch will permit operation over a relatively wide frequency band with reasonable efliciency.
  • the particular example given is in the range of 800 megacycles it is clear that the invention may apply to lower frequencies as well, where the normal dimensions are greater so that the reduction in dimensions is of greater importance from a standpoint of ready rotatability.
  • a radio antenna assembly for radiating a plane polarized wave comprising a radiating dipole antenna of small length relative to half a wave-length at the operating frequency, and a resonator including conductive vertical supports physically enclosing said antenna but open to radiation in said plane of polarization.
  • a radio antenna assembly comprising a dipole radiator having an overall length short with respect to a quarter wave length at the operating frequency, a pair of conductive plates spaced apart on opposite sides of and substantially concentric with a perpendicular axis of said dipole, and a plurality of spaced rods interconnecting said plates and arranged in a circular pattern, and regularly spaced from one another at substantially a tenth wave length, said plates and rods forming a resonator cage substantially matching the impedance of said antenna to the radiation space at said operating frequency.
  • a radio antenna assembly comprising a dipole radiator having an overall length between one twentieth and three tenths wave length at the operating frequency, a pair of conductive plates spaced apart a half wave length at the operating frequency on opposite sides of and substantially concentric with a perpendicular axis of said dipole, and a plurality of spaced rods interconnecting said plates and arranged in a circular pattern of substantially one half a wave length diameter at the operating frequency, and spaced from one another substantially a tenth wave length.
  • a radio antenna assembly comprising a radiating antenna of small length relative to half a wave length at the operating frequency and capable of producing directive, substantially plane polarized radiations, a resonator comprising a pair of plates having conductive sur- 3 t faces spaced on opposite sides of said antenna, and a plurality of conductive rods perpendicular to the plane of polarization of said dipole, spaced around the antenna and connected to said plates.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Waveguide Aerials (AREA)
US128332A 1949-11-19 1949-11-19 Balanced doublet antenna of small dimension Expired - Lifetime US2774967A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE499425D BE499425A (en(2012)) 1949-11-19
US128332A US2774967A (en) 1949-11-19 1949-11-19 Balanced doublet antenna of small dimension
GB18895/50A GB677860A (en) 1949-11-19 1950-07-28 Antenna of small dimensions
CH298003D CH298003A (fr) 1949-11-19 1950-11-13 Dispositif d'antenne.
FR1027809D FR1027809A (fr) 1949-11-19 1950-11-17 Antenne de petites dimensions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US128332A US2774967A (en) 1949-11-19 1949-11-19 Balanced doublet antenna of small dimension

Publications (1)

Publication Number Publication Date
US2774967A true US2774967A (en) 1956-12-18

Family

ID=22434820

Family Applications (1)

Application Number Title Priority Date Filing Date
US128332A Expired - Lifetime US2774967A (en) 1949-11-19 1949-11-19 Balanced doublet antenna of small dimension

Country Status (5)

Country Link
US (1) US2774967A (en(2012))
BE (1) BE499425A (en(2012))
CH (1) CH298003A (en(2012))
FR (1) FR1027809A (en(2012))
GB (1) GB677860A (en(2012))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4692705A (en) * 1983-12-23 1987-09-08 General Electric Company Radio frequency field coil for NMR
US4694255A (en) * 1983-11-04 1987-09-15 General Electric Company Radio frequency field coil for NMR
US4712068A (en) * 1983-07-07 1987-12-08 Instrumentarium Corp. RF coil arrangement for NMR examination apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132022B (en) * 1982-05-21 1985-07-24 Decca Ltd Radio frequency antenna and radio direction finding apparatus incorporating such antenna

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044413A (en) * 1930-08-08 1936-06-16 Weyrich Rudolf Transmitter and receiver for electromagnetic waves
US2359620A (en) * 1942-06-13 1944-10-03 Rca Corp Short wave antenna
US2398096A (en) * 1940-12-12 1946-04-09 Rca Corp Two frequency electromagnetic horn radiator
US2415094A (en) * 1938-01-17 1947-02-04 Board Radio measurement of distances and velocities
US2418084A (en) * 1945-11-05 1947-03-25 United Air Lines Inc Antenna
US2465416A (en) * 1943-10-02 1949-03-29 Zenith Radio Corp Resonant circuit and radiator
US2532919A (en) * 1947-04-21 1950-12-05 Johnson William Arthur Radio aerial system, and particularly directive aerial system
US2539680A (en) * 1945-11-26 1951-01-30 Rca Corp Ultra high frequency antenna
US2572041A (en) * 1947-10-29 1951-10-23 Sperry Corp Selective azimuth signaling system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044413A (en) * 1930-08-08 1936-06-16 Weyrich Rudolf Transmitter and receiver for electromagnetic waves
US2415094A (en) * 1938-01-17 1947-02-04 Board Radio measurement of distances and velocities
US2398096A (en) * 1940-12-12 1946-04-09 Rca Corp Two frequency electromagnetic horn radiator
US2359620A (en) * 1942-06-13 1944-10-03 Rca Corp Short wave antenna
US2465416A (en) * 1943-10-02 1949-03-29 Zenith Radio Corp Resonant circuit and radiator
US2418084A (en) * 1945-11-05 1947-03-25 United Air Lines Inc Antenna
US2539680A (en) * 1945-11-26 1951-01-30 Rca Corp Ultra high frequency antenna
US2532919A (en) * 1947-04-21 1950-12-05 Johnson William Arthur Radio aerial system, and particularly directive aerial system
US2572041A (en) * 1947-10-29 1951-10-23 Sperry Corp Selective azimuth signaling system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712068A (en) * 1983-07-07 1987-12-08 Instrumentarium Corp. RF coil arrangement for NMR examination apparatus
US4694255A (en) * 1983-11-04 1987-09-15 General Electric Company Radio frequency field coil for NMR
US4692705A (en) * 1983-12-23 1987-09-08 General Electric Company Radio frequency field coil for NMR

Also Published As

Publication number Publication date
CH298003A (fr) 1954-04-15
GB677860A (en) 1952-08-20
BE499425A (en(2012))
FR1027809A (fr) 1953-05-15

Similar Documents

Publication Publication Date Title
US2321454A (en) Multiple section antenna
US2455403A (en) Antenna
US3569979A (en) Helical launcher
US3820117A (en) Frequency extension of circularly polarized antenna
US2966678A (en) Multifrequency resonant antenna
GB648262A (en) Antenna
US2935747A (en) Broadband antenna system
US2978703A (en) Folded dipole antenna fabricated from a single metallic sheet
GB1338753A (en) Multimode antenna
US4031539A (en) Broadband turnstile antenna
US2290800A (en) Antenna
US2774967A (en) Balanced doublet antenna of small dimension
US2459768A (en) Apparatus for the radiation or reception of electromagnetic waves
US2465379A (en) Antenna unit
US4015264A (en) Dual mode broadband antenna
US2556046A (en) Directional antenna system
US2493514A (en) Multiply-resonant stub antenna
US3438043A (en) Short backfire antenna
US2714659A (en) Broad band unidirectional antenna
US2207781A (en) Ultra high frequency antenna
US2267613A (en) Broadcast antenna
US2487622A (en) Three-phase slot antenna system
US2570824A (en) Wide band antenna
US3177491A (en) Cavity antenna with flared horn
US2983919A (en) Tuning means for slot radiator