Antenna assembly with balun and tuning element for a portable ra

Telecommunications – Transmitter and receiver at same station – With a common signal processing stage

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Details

455121, 455129, 343859, 343895, H01Q 1108, H01Q 136

Patent

active

056782012

ABSTRACT:
Arms (310, 320, 330, 340) of an antenna element are connected to a balanced-unbalanced conversion network (510) at a feed point of excitation to provide an antenna assembly. Characteristics such as size of the antenna assembly are improved by providing a tuning element near connections (610, 620) to a feed point of excitation. The tuning element (410) is electrically connected to one of the arms (330) but is disposed with a gap between a neighboring arm (320). A gap may also be provided between the tuning element (410) and a feed point of excitation. The arms and tuning element are preferably thin metallic arms formed on an elongated dielectric tube (210) in the preferred construction of the invention. The balanced-unbalanced conversion network (510) may also be disposed within the elongated dielectric tube (210) according to the preferred construction.

REFERENCES:
patent: 5349365 (1994-09-01), Ow et al.
patent: 5628057 (1997-05-01), Phillips et al.
"Spacecraft Antennas", Chapter 20, American Radio Relay League, pp. 20-1 to 20-7.
A. Kumar, Fixed and Mobile Terminal Antennas, Chapter 5, Artech House, Inc., 1991, pp. 163-236.

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