Antenna apparatus with a coaxial cable used as a radiation eleme

Details Antenna apparatus with a coaxial cable used as a radiation eleme Antenna apparatus with a coaxial cable used as a radiation eleme

1997-03-31

2000-06-27

Wong, Don

Communications: radio wave antennas

Antennas

With radio cabinet

343792, 343895, H01Q 124

Patent

active

060812362

ABSTRACT:
An antenna apparatus with a coaxial cable used as a radiation element includes an antenna element having a first electrical length and a feeding point at an end. The coaxial cable is a second electrical length and both the inner and an outer conductors are coupled to a radio wave circuit at corresponding ends. An opposite end of the inner conductor connects to the feeding point of the antenna element. The first and second electrical lengths are selected to have resonance between the antenna element and the coaxial cable so that a radio wave signal is transmitted from both the antenna element and the outer conductor of the coaxial cable. The electrical length may be one quarter wavelength and the coaxial cable can be made of elastic material. Resonance is provided by generating a standing wave along the antenna element and the coaxial outer conductor at one quarter wavelength the desired frequency. By using the outer conductor of the coaxial cable as a radiation element unbalanced current can be prevented from flowing into the radio wave circuit. The elasticity of the coaxial cable permits close proximity between the antenna element and the radio wave circuit, allowing for miniaturization of the apparatus.

REFERENCES:
patent: 3576578 (1971-04-01), Harper
patent: 3582952 (1971-06-01), Heins
patent: 4138681 (1979-02-01), Davidson et al.
patent: 4509056 (1985-04-01), Ploussios
patent: 4591863 (1986-05-01), Patsiokas
patent: 5317325 (1994-05-01), Bottomley
patent: 5440317 (1995-08-01), Jalloul et al.
patent: 5585807 (1996-12-01), Takei
patent: 5652598 (1997-07-01), Campbell et al.
patent: 5668559 (1997-09-01), Baro

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