Inverted-F ferroelectric antenna

Details Inverted-F ferroelectric antenna Inverted-F ferroelectric antenna

2005-04-26

2005-04-26

Wimer, Michael C. (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S702000

Reexamination Certificate

active

06885341

ABSTRACT:
An inverted-F ferroelectric antenna is provided. The antenna comprises a counterpoise, or groundplane, and an inverted-F structure radiator having a first end connected to the counterpoise. A fixed dielectric material, typically a ceramic or air separates the radiator and the counterpoise. A capacitor, formed from a ferroelectric dielectric is connected between the second end of the radiator and the counterpoise. The capacitor has a variable dielectric constant, and the antenna is resonant at a frequency responsive to the dielectric constant of the capacitor ferroelectric material. Typically, the capacitor includes a dielectric formed from a fixed constant dielectric, together with a ferroelectric dielectric with a variable dielectric constant. A bias voltage feed is used to apply a voltage to the capacitor ferroelectric dielectric. The ferroelectric dielectric has a dielectric constant that varies in response to the applied voltage. In one aspect of the antenna, the capacitor has a capacitance of approximately 0.35 picofarads (pF) at zero volts of bias voltage and a capacitance of approximately 0.29 pf at 40 volts of bias voltage.

REFERENCES:
patent: 5231407 (1993-07-01), McGirr et al.
patent: 5764190 (1998-06-01), Murch et al.
patent: 5966097 (1999-10-01), Fukasawa et al.

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