Physically Adaptive Antennas

A reconfigurable antenna concept, consisting of a semiconductor illuminated by an optical or electron source, was studied. With appropriate-illumination, mobile charge carriers excited from the valence band to the conduction band can form a conducting antenna pattern in the semiconductor material. C...

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Bibliographic Details
Main Author: Ho, Ping-Tong
Format: Report
Language:English
Subjects:
ANTENNA RADIATION PATTERNS
ARRAYS
BOW TIE ANTENNAS
COMPUTATIONS
CONDUCTION BANDS
DIPOLE ANTENNAS
Electrical and Electronic Equipment
ELECTRONS
FREQUENCY
FREQUENCY AGILITY
GAIN
LIMITATIONS
MATERIALS
PE62702F
POWER SUPPLIES
RADIATION
RADIATION RESISTANCE
RECONFIGURABLE ANTENNAS
REQUIREMENTS
RESISTIVE ANTENNAS
SEMICONDUCTOR LASERS
SEMICONDUCTORS
SILICON
SOURCES
VALENCE BANDS
WURLA1500001
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Summary:A reconfigurable antenna concept, consisting of a semiconductor illuminated by an optical or electron source, was studied. With appropriate-illumination, mobile charge carriers excited from the valence band to the conduction band can form a conducting antenna pattern in the semiconductor material. Calculations of gain and radiation resistance for linear dipole and "bow-tie" layouts were completed to estimate source power requirements and practical wavelength limits for such an antenna. Significant findings were that source power for writing a reconfigurable antenna increases as the square of the radiation wavelength; and that semiconductor material permittivity limits antenna efficiency to about one-tenth that of a comparable free-standing antenna. Frequency agility in the antenna may be possible using an electronically controllable liquid crystal display, semiconductor laser array, or electron emitter tips.