GB924145A - Improvements in or relating to antenna structure - Google Patents

Improvements in or relating to antenna structure

Info

Publication number
GB924145A
GB924145A GB1620559A GB1620559A GB924145A GB 924145 A GB924145 A GB 924145A GB 1620559 A GB1620559 A GB 1620559A GB 1620559 A GB1620559 A GB 1620559A GB 924145 A GB924145 A GB 924145A
Authority
GB
United Kingdom
Prior art keywords
central conductor
conductor
conductors
signals
helical
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
GB1620559A
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.)
General Electric Co
Original Assignee
General Electric Co
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 US739748A priority Critical patent/US2953786A/en
Application filed by General Electric Co filed Critical General Electric Co
Publication of GB924145A publication Critical patent/GB924145A/en
Application status is Expired legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08Helical antennas

Abstract

924,145. Aerials. GENERAL ELECTRIC CO. May 12, 1959 [June 4, 1958], No. 16205/59. Class 40 (7). An omnidirectional aerial system consists of a linear central conductor 20, a first spiral conductor 42 wrapped round it and extending from a first point 22 along the length of the central conductor towards one end thereof, and a second spiral conductor 44 extending round the central conductor in the same sense from a second point 24 between the point 22 and the other end towards said other end of the central conductor. Energisation of the aerial is at the points 22 and 24 by coaxial lines 32 and 34 whose inner conductors are connected to the respective spiral conductors and whose outer sheaths are connected to the central conductor 20. A tubular insulator 21 surrounds the central conductor and insulates the spiral conductors and the connections thereto. A number of such systems may be stacked end to end to improve the polar diagram in planes containing the axis of the conductors 20. The conductors 42 and 44 preferably each have an axial length of between one-and-a-half and five wavelengths and the helix diameter and pitch is made such that the circumference of each turn is an integral number of operating wavelengths. Their outer ends may be free or in contact with the central conductor as little energy reaches the extremities of the system. The radial spacing between the central conductor and conductors 42 and 44 determines the characteristic impedance and the radiation per unit length. It must be related to the helical pitch in such a way that the coupling between a turn of helical conductor and the central conductor is greater than the coupling between adjacent turns of helical conductor. If this were not so energy would propagate along the aerial as along a coaxial line instead of along a helical path. Typically the radial spacing may be 0.1 #, the helical pitch 0.5 #, the helical turn length 2 #, and the number of turns per helix 5. Energization.-It is explained with the aid of vector and other diagrams (Figs. 4 to 9, all not shown) that energization with equi-strength and equi-phase signals at the feed points 22 and 24 gives radiation of horizontal polarization; energization with equi-strength but oppositely phased signals gives vertically polarized radiation. The aerial may be arranged to radiate independent signals of different frequencies, one vertically and one horizontally polarized, at the same time. This is done by coupling the two transmitters 60, 62 to a hybrid junction 64. Signals from transmitter 60 appear in the same phase over line 74 and lagging by 90 degrees over line 71. Those from transmitter 62 appear with the same phase over line 71 and lagging by 90 degrees over line 74. A 90-degree phase retarder 66 is coupled between line 71 and aerial feeder 72. Thus signals from transmitter 60 are radiated vertically polarized and those from transmitter 62 are horizontally polarized. If the transmitters are combined and signals of the same frequency are fed to the inputs of the hybrid junction, elliptically, or with suitable equality of constants, circularly, polarized radiation may be radiated.
GB1620559A 1958-06-04 1959-05-12 Improvements in or relating to antenna structure Expired GB924145A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US739748A US2953786A (en) 1958-06-04 1958-06-04 Antenna for polarized propagation

Publications (1)

Publication Number Publication Date
GB924145A true GB924145A (en) 1963-04-24

Family

ID=24973622

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1620559A Expired GB924145A (en) 1958-06-04 1959-05-12 Improvements in or relating to antenna structure

Country Status (4)

Country Link
US (1) US2953786A (en)
DE (1) DE1093837B (en)
FR (1) FR1226301A (en)
GB (1) GB924145A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206243A (en) * 1987-06-24 1988-12-29 Panorama Antennas Ltd Dual-frequency helical antenna
US5600341A (en) * 1995-08-21 1997-02-04 Motorola, Inc. Dual function antenna structure and a portable radio having same

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015823A (en) * 1959-02-17 1962-01-02 Gen Electric Helical antenna null suppressor
US3230540A (en) * 1961-06-09 1966-01-18 Sumitomo Electric Industries Spaced helical radiating conductor insulatingly supported along the length of central conductor support
US3166724A (en) * 1961-11-24 1965-01-19 Philip J Allen Electrical frequency shifter utilizing faraday phase shifter and dual mode coupler with rotatable reflection dipole
US3449657A (en) * 1966-11-14 1969-06-10 Chevron Res Helical antenna for irradiating an earth formation penetrated by a borehole and method of using same
US3617890A (en) * 1967-01-12 1971-11-02 Sumitomo Electric Industries Induction radio system for vehicles
FR2091927B1 (en) * 1970-05-06 1974-03-15 Dassault Electronique
US4442438A (en) * 1982-03-29 1984-04-10 Motorola, Inc. Helical antenna structure capable of resonating at two different frequencies
DE4121060A1 (en) * 1991-06-26 1993-01-14 Ant Nachrichtentech Transversely radiating coil aerial - has extra conductor starting at coil beginning and extending at opposite direction to coil
US5587719A (en) * 1994-02-04 1996-12-24 Orbital Sciences Corporation Axially arrayed helical antenna
FR2751137B1 (en) * 1996-07-10 1998-11-06 Centre Nat Etd Spatiales Transmission device has omnidirectional antenna
US5977931A (en) 1997-07-15 1999-11-02 Antenex, Inc. Low visibility radio antenna with dual polarization
US6169523B1 (en) * 1999-01-13 2001-01-02 George Ploussios Electronically tuned helix radiator choke
US7209096B2 (en) * 2004-01-22 2007-04-24 Antenex, Inc. Low visibility dual band antenna with dual polarization
US8803749B2 (en) 2011-03-25 2014-08-12 Kwok Wa Leung Elliptically or circularly polarized dielectric block antenna
JP6529297B2 (en) * 2015-03-20 2019-06-12 日本無線株式会社 Polarization shared helical antenna

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619635A (en) * 1950-06-19 1952-11-25 Herman N Chait Arbitrarily polarized antenna system
BE517630A (en) * 1952-02-13

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206243A (en) * 1987-06-24 1988-12-29 Panorama Antennas Ltd Dual-frequency helical antenna
US5600341A (en) * 1995-08-21 1997-02-04 Motorola, Inc. Dual function antenna structure and a portable radio having same

Also Published As

Publication number Publication date
US2953786A (en) 1960-09-20
FR1226301A (en) 1960-07-11
DE1093837B (en) 1960-12-01

Similar Documents

Publication Publication Date Title
US3623114A (en) Conical reflector antenna
US3568204A (en) Multimode antenna feed system having a plurality of tracking elements mounted symmetrically about the inner walls and at the aperture end of a scalar horn
US3656167A (en) Dipole radio antennae
Kaiser The Archimedean two-wire spiral antenna
US4208660A (en) Radio frequency ring-shaped slot antenna
US4162499A (en) Flush-mounted piggyback microstrip antenna
US4042935A (en) Wideband multiplexing antenna feed employing cavity backed wing dipoles
US2324462A (en) High frequency antenna system
GB1190888A (en) Improvements in or relating to Radio Antennas
US5650792A (en) Combination GPS and VHF antenna
CA1057392A (en) Dual-frequency circularly polarized antenna for satellite navigation and related problems
US4115782A (en) Microwave antenna system
GB1095093A (en) Improvements in or relating to surface-wave transmission lines
US2521550A (en) Radio antenna system
Jordan et al. Developments in broadband antennas
US3942180A (en) Wide-band omnidirectional antenna
Rumsey Frequency independent antennas
US3969730A (en) Cross slot omnidirectional antenna
US5255005A (en) Dual layer resonant quadrifilar helix antenna
US2364371A (en) Double polarization feed for horn antennas
US2175252A (en) Short wave antenna
US2321454A (en) Multiple section antenna
US3110030A (en) Cone mounted logarithmic dipole array antenna
US4740795A (en) Dual frequency antenna feeding with coincident phase centers
EP0751581B1 (en) Loop antenna for circularly polarized wave