Antenna resonant circuit

Details Antenna resonant circuit Antenna resonant circuit

1992-05-20

1994-02-22

Mintel, William

Communications: radio wave antennas

Antennas

With variable reactance for tuning antenna

343748, 343850, 455 83, H01Q 23000, H01Q 9000, H04B 1440

Patent

active

052891992

ABSTRACT:
An antenna resonant circuit (10) is described having a coil (18, 26) and a capacitor (30) as frequency-determining elements for use in a transmitting/receiving device which in a transmitting operating phase transmits HF signals of high power and in a receiving operating phase receives HF signals of low power. In the antenna resonant circuit (10) parallel to the capacitor (30) there is a series circuit of a further capacitor (32) and a threshold value switch (34, 36). Said threshold value switch (34, 36) is of high resistance when the voltage applied thereto is smaller than its threshold value and of low resistance when the voltage applied thereto is greater than its threshold value. The threshold value of the threshold value switch (34, 36) is so set that it is greater than the voltage applied thereto in the receiving operating phase but smaller than the voltage applied thereto in the transmitting operating phase.

REFERENCES:
patent: 3102991 (1963-09-01), Jess
patent: 3117241 (1964-01-01), Paynter et al.
patent: 3452299 (1969-06-01), Angel
patent: 4542532 (1985-09-01), McQuilkin
patent: 4963880 (1990-10-01), Torre et al.
patent: 4973940 (1990-11-01), Sakai et al.
patent: 5168282 (1992-12-01), Viereck
M. J. Koppen, P-I-N Diode Aerial Switches for the 160 MH.sub.z Communications Band, Electronic Applications (Neth.), vol. 30, No. 3, 1970 pp. 98-103.

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