Rod-shaped multi-band antenna

Details Rod-shaped multi-band antenna Rod-shaped multi-band antenna

1992-03-17

1993-11-02

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With lumped reactance filter in active antenna

343715, 343749, H01Q 932, H01Q 501

Patent

active

052587657

ABSTRACT:
Rod-shaped multi-band antennas require at least one parallel resonance circuit for separating the individual frequency bands, which consists of a coil and a discrete capacitor. Multi-band antennas of this type for a maximum of three frequency bands are as a rule only suitable for a frequency range from 3 to 30 MHz. In a multi-band antenna (10) suitable for four frequency bands, a first coil (15) is located between a first and a second straight wire piece (14, 16), and a second coil (17) between the second, straight wire section (16) and a third, straight wire piece (18). The first coil constitutes a parallel resonance circuit or a trap circuit, and the second coil a phase shift coil. The multi-band antenna is particularly suited as a vehicle aerial to which a car radio for the AM and FM ranges as well as a mobile telephone for two different nets is connected. The drawing illustrates a rod-like multi-band antenna in accordance with the invention.

REFERENCES:
patent: 4145693 (1979-03-01), Fenwick
patent: 4675687 (1987-06-01), Elliott

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