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US 4,397,041 AGranted
Complex antenna system and FM/AM receiver
AssigneePioneer Electronic Corporation
InventorsShigeki Takeda, Junichi Shibata, Masashi Shimakata, Yasuhiro Oshime, Shintaro Gomi, Katsuaki Kawamura
Life of this patent
Estimating the term…
Abstract
A complex antenna system including at least two loop antennas crossing each other and connected with each other at the electric neutral points thereof, and a rod antenna positioned at the central portion of the loop antennas. An FM and/or AM tuners combined with the complex antenna system utilizes selected one of the loop antennas for receiving an FM wave so as to avoid multi-path noises.
Claims8
An FM receiver comprising an FM tuner (13);
- an antenna system (1), said antenna system including at least two loop antennas crossing each other and connected with each other at the electric neutral points thereof and having the output terminals thereof positioned closely to each other;
- a multipath noise detector (17) connected to said FM tuner for producing a change-over signal when it detects the multipath noises;
- at least two impedance matching circuits (10a, 10b) having the input terminals thereof respectively connected to the output terminals of said loop antennas;
- and a switching circuit (12) for alternately connecting either one of the output terminal of said impedance matching circuits to the input terminal of said FM tuner.
1 more element
Dependencies are inferred from the claim text.