GB579778A - Improvements relating to radio antennae - Google Patents

Improvements relating to radio antennae

Info

Publication number
GB579778A
GB579778A GB18436/43A GB1843643A GB579778A GB 579778 A GB579778 A GB 579778A GB 18436/43 A GB18436/43 A GB 18436/43A GB 1843643 A GB1843643 A GB 1843643A GB 579778 A GB579778 A GB 579778A
Authority
GB
United Kingdom
Prior art keywords
stub
conductor
cylinder
aerial
line
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
GB18436/43A
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
Priority to GB18436/43A priority Critical patent/GB579778A/en
Publication of GB579778A publication Critical patent/GB579778A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/16Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines

Abstract

579,778. Aerials. STANDARD TELEPHONES & CABLES, Ltd., and WILLOUGHBY, E. O. Nov. 5, 1943, No. 18436. [Class 40 (v)] An aerial system having a substantially flat amplitudefrequency characteristic over a wide frequency band is provided by coupling a tubular radiating element to a transmission line by means of a resonant stub formed inside the tubular radiator. A hollow conducting cylinder 1, Fig. 1, with conical end 3, half-wave resonant at the mean frequency and supported by an insulating bush 6 in an insulating tubular casing 5 above the earth plate 4, forms the radiating element. A central conductor 7 connected to the closed upper end 2 forms with the cylinder 1 a short-circuited stub which is tuned by condenser 11 to be half-wave resonant at the mean operating frequency. The aerial is fed from a transmission line 8 by a quarterwave matching transformer 10, connection being made to the central conductor 7 so that the impedance across the open end of the stub is in series with the aerial, and the variations in impedance of the aerial and stub neutralize one another at frequencies other than the mean value. As a refinement, the reactance introduced by the stub may be made to overcompensate for the aerial reactance in order to take account of the reactance introduced by the transformer 10 at frequencies other than that at which it is correctly one-quarter wavelength long. In a modification, Fig. 2 (not shown), a dipole system comprises two halfwave elements, similar to that shown in Fig. 1, arranged end to end and fed through two coaxial lines or a two-wire screened or unscreened line. Fig. 4 shows a dipole arrangement in which the coaxial line 8 and matching transformer 10 are brought coaxially through the lower cylindrical member 1A, the outer conductor of the line being connected to the member 1A while the inner conductor is connected to the inner conductor 7 of the upper element. With this arrangement the conductor 7 and cylinder 1 form the only stub in series with the aerial system and have to introduce the required reactance to neutralize both members of the dipole. In order to prevent energy being transferred to the outer conductor of the line 8, a short-circuiting disc 15 is provided inside the cylinder 1A a quarter wavelength from the open end. In a modification, Fig. 5 (not shown), a two-wire screened feed is employed, one conductor being connected to the conductor 7 and the other to the cylinder 1A at its upper end. A short-circuiting disc 15 is fitted to make the lower portion of cylinder 1A operate as a quarter wave suppressing stub, the upper portion having additional capacity to cause it to operate in the same manner. Various methods of mounting the dipole aerials on a mast or supported from guys are illustrated in Figs. 3, 6 and 7 (not shown). Specification 541,870 is referred to.
GB18436/43A 1943-11-05 1943-11-05 Improvements relating to radio antennae Expired GB579778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB18436/43A GB579778A (en) 1943-11-05 1943-11-05 Improvements relating to radio antennae

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB18436/43A GB579778A (en) 1943-11-05 1943-11-05 Improvements relating to radio antennae
US573099A US2480172A (en) 1943-11-05 1945-01-16 Radio antenna
FR932829D FR932829A (en) 1943-11-05 1946-08-27 Improvements to radio-electric antenna systems

Publications (1)

Publication Number Publication Date
GB579778A true GB579778A (en) 1946-08-15

Family

ID=10112412

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18436/43A Expired GB579778A (en) 1943-11-05 1943-11-05 Improvements relating to radio antennae

Country Status (3)

Country Link
US (1) US2480172A (en)
FR (1) FR932829A (en)
GB (1) GB579778A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624844A (en) * 1946-03-04 1953-01-06 Jessic A Nelson Broad band antenna
US2683808A (en) * 1947-02-17 1954-07-13 Shumaker Clifton Broad band antenna
US2594055A (en) * 1949-06-29 1952-04-22 Westinghouse Electric Corp Antenna coupling system
US2750590A (en) * 1951-11-06 1956-06-12 Henry V Phelps Dipole antenna
US4117493A (en) * 1976-12-22 1978-09-26 New-Tronics Corp. Radio antenna
US4109255A (en) * 1977-03-21 1978-08-22 Silliman Thomas B Omnidirectional broadband circularly polarized antenna

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB260005A (en) * 1925-10-19 1927-03-24 Emil Geles Improvements in and relating to aerials for the transmission and reception of electro-magnetic waves
US2067337A (en) * 1932-08-12 1937-01-12 Telefunken Gmbh Antenna for submarines
GB475348A (en) * 1936-03-17 1937-11-17 Edward Cecil Cork Improvements in or relating to wireless aerial systems
US2158271A (en) * 1936-10-13 1939-05-16 Telefunken Gmbh Short wave antenna
FR49942E (en) * 1937-11-16 1939-09-25
US2181870A (en) * 1938-02-15 1939-12-05 Rca Corp Wide band, short wave antenna and transmission line system
US2311364A (en) * 1939-04-03 1943-02-16 Buschbeck Werner Broad-band antenna
NL62835C (en) * 1940-11-09
US2321454A (en) * 1941-11-22 1943-06-08 Rca Corp Multiple section antenna
US2368298A (en) * 1942-07-11 1945-01-30 Republic Aviat Corp Aircraft structure

Also Published As

Publication number Publication date
FR932829A (en) 1948-04-02
US2480172A (en) 1949-08-30

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