Dual band antenna having separate matched inputs for each band

Details Dual band antenna having separate matched inputs for each band Dual band antenna having separate matched inputs for each band

1986-01-03

1987-06-09

Ng, Jin F.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 90, 343702, 343846, 343860, H04B 138, H01Q 124

Patent

active

046726853

ABSTRACT:
This dual input antenna system has a first input which provides an impedance match over a first range of frequencies and a second input which provides an impedance match over a second range of frequencies. This effectively enables a narrow band antenna to operate and provide a matched condition at two separate frequency ranges. First and second longitudinal radiating elements are connected at respective ends by an approximate 1/2 wavelength transmission line. The other end of each radiating element is connected by transmission lines to a receive filter and transmit filter, respectively. The receive and transmit filters provide a substantial reactance outside of the respective passbands. The wavelengths of the first and second transmission lines are selected to transform the reactance of each filter into a value which will provide a match condition for the other transmission line at the respective frequency ranges.

REFERENCES:
patent: 3622884 (1971-01-01), Kent
patent: 3838429 (1974-01-01), Reggia
patent: 4160210 (1979-01-01), Molinari
patent: 4313119 (1982-01-01), Garay et al.
patent: 4356492 (1982-10-01), Kaloi
patent: 4571595 (1986-02-01), Phillips et al.
Yukio Yokoyama, Dual-Resonance Broadband Microstrip Antenna, in Proceedings of ISAP '85, approximately Jun., 1985.

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