| 摘要 |
An inverted-F ferroelectric antenna is provided. The antenna comprises a counterpoise, or groundplane (102), and an inverted-F structure radiator (104) having a first end (106) connected to the counterpoise. A fixed dielectric material (110), typically a ceramic or air separates the radiator and the counterpoise. A capacitor (112), 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 ahs 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.
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