Importance

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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.

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First Claim