Dual band antenna for mobile communications

Details Dual band antenna for mobile communications Dual band antenna for mobile communications

1997-11-10

2000-03-14

Wong, Don

Communications: radio wave antennas

Antennas

With lumped reactance for loading antenna

343790, 343749, 343792, H01Q 916

Patent

active

060379073

ABSTRACT:
A dual band antenna for mobile communications includes a rod-shaped radiating element having a first portion of a predetermined length connected to a coaxial feed line, and a second portion of a specified length integrally extended from the first portion. The coaxial feed line connects to a ground plate, and a first capacitive load connects to the first portion of the radiating element. A choke surrounds the second portion of the radiating element, and has a shorting end connected to a distal end of the second portion and an open end at a proximal end of the second portion. A second capacitive load connects to the shorting end of the choke. In a higher operating band of the dual band, the input impedance of the choke is high, such that only the first (lower) portion of the radiating element radiates. At a lower operating band of the dual band, the choke's input impedance is lower to allow for radiation from the entire length of the antenna.

REFERENCES:
patent: 2239724 (1941-04-01), Lindenblad
patent: 4509056 (1985-04-01), Ploussios
patent: 5248988 (1993-09-01), Makino

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