Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Reexamination Certificate
2008-05-20
2010-06-29
Wimer, Michael C (Department: 2821)
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
C343S705000, C343S752000, C343S861000, C343S872000
Reexamination Certificate
active
07746282
ABSTRACT:
Compact top-loaded, fractal monopole antenna system embodiments are provided for multi-band airborne operation over ultrabroadband ranges (e.g., 30 to 2000 MHz). These multi-band embodiments are self-contained, aerodynamic and compact (e.g., blade height less than 9.5 inches) and are power efficient with a low return loss (e.g., less than −7 dB). System embodiments include a set of impedance-matching circuits configured to substantially match an antenna impedance to a predetermined system impedance over a set of predetermined frequency bands. In an embodiment, at least one impedance-matching circuit includes a chain of selectable air-core inductors which are novelly arranged to improve radiation efficiency and prevent damage to support substrates. In an embodiment, a lowest-frequency one of the impedance-matching circuits is configured to process signals having a maximum wavelength λmaxwherein a fractal member is configured with a length that does not exceed λmax/40. System embodiments are configured to respond to a variety of existing radio systems that send commands via different encoding formats.
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Lin Jack J. Q.
Lin Zhen Biao
Robin Seymour
Koppel, Patrick, Heybl & Dawson
Sensor Systems, Inc.
Wimer Michael C
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