Communications: radio wave antennas – Antennas – With grounding structure
Patent
1992-05-29
1994-11-01
Issing, Gregory C.
Communications: radio wave antennas
Antennas
With grounding structure
333192, 333195, H01Q 148, H03H 900
Patent
active
053610776
ABSTRACT:
An antenna utilizing an overmoded configuration for coupling energy in a predetermined frequency band between an electrical circuit and a propagating medium. The antenna includes a first thin film resonator having a first pair of electrodes and a first thin film piezoelectric element interposed between the first pair of electrodes, with the first thin film resonator coupled to the electrical circuit. A second thin film resonator includes a second pair of electrodes and a second thin film piezoelectric element interposed between the second pair of electrodes, the second thin film resonator being operable for interfacing between the antenna and the propagating medium. A delay element interposed between the first and second thin film resonators has a thickness substantially equal to a multiple of one-half wavelength of a desired frequency in the predetermined frequency band for acoustically coupling energy in the predetermined frequency band between the first and second thin film resonators. Alternatively, the delay element can have a thickness of a multiple of one-half wavelength plus one-quarter wavelength so that the delay element acts as an impedance inverter.
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Iowa State University & Research Foundation, Inc.
Issing Gregory C.
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