Capacitive-type, electrically short, broadband antenna and coupl

Details Capacitive-type, electrically short, broadband antenna and coupl Capacitive-type, electrically short, broadband antenna and coupl

Filed on

1993-06-29

Date issued

1994-09-13

Examiner

Hajec, Donald

Patent Class

Communications: radio wave antennas

SubClass

Antennas

SubSubClass

With lumped reactance for loading antenna

Other Related Categories

343908, 343702, H01Q 900, H01Q 124

Type

Patent

Status

active

Patent number

053472918

Description

ABSTRACT:
An electrically short antenna for transmitting or receiving radiation has first and second electrode forming a capacitor radiator. The antenna is short in the sense that the gap distance between the electrodes and the dimension of the electrodes themselves sum to less than .lambda./4. An inductor has one end thereof coupled to one of the first and second electrodes via a first wire, and the other of the electrodes is connected to ground via a second wire. The antenna includes structure for inhibiting transmission or reception of electromagnetic energy of wavelength .lambda. from first and second wires so that transmission or reception of electromagnetic energy primarily emanates from said electrode surfaces.

REFERENCES:
patent: 1783025 (1930-11-01), Meissner
patent: 2359620 (1944-10-01), Carter
patent: 3829863 (1974-08-01), Lipsky
patent: 4675691 (1987-06-01), Moore
J. D. Kraus, "Antennas", 1988, pp. 711-714.
R. C. Hansen, "Fundamental Limitations in Antennas", Proceedings of the IEEE, vol. 69, No. 2, Feb. 1981, pp. 170-182.
H. A. Wheeler, "Fundamental Limitations of Small Antennas", Proceedings of the I.R.E., vol. 35, No. 12, Dec. 1947, pp. 1479-1484.
S. Ramo et al., "Fields and Waves in Modern Radio", 1944, pp. 432 and 458-459.

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