ACTIVE ANTENNA

PROBLEM TO BE SOLVED: To provide an active antenna, capable of impedance setting that the impedance of a helical antenna shows capacitance with a low frequency and inductance with a high frequency if viewed in terms of a wide band, the extension of impedance on a Smith chart is small if it is used i...

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Bibliographic Details
Main Authors FUKAZAWA TORU, IKEDA YUKIO, ANDREI ANDRENKO, NAKAYAMA MASATOSHI, HORIGUCHI KENICHI
Format Patent
LanguageEnglish
Published 23.03.2001
Edition7
Subjects
ANTENNAS, i.e. RADIO AERIALS
BASIC ELECTRIC ELEMENTS
ELECTRICITY
RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
WAVEGUIDES
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Summary:PROBLEM TO BE SOLVED: To provide an active antenna, capable of impedance setting that the impedance of a helical antenna shows capacitance with a low frequency and inductance with a high frequency if viewed in terms of a wide band, the extension of impedance on a Smith chart is small if it is used in an inductive frequency and the characteristic of a high gain can be obtained in wide band and realizing impedance setting adapted to various purposes. SOLUTION: The active antenna is constituted of a helical antenna 5 and a semiconductor element 7, which are mounted on the same substrate 1. The lead 6 of the helical antenna 5 is connected directly to the input terminal or the output terminal of the semiconductor element 7 via a connection line or a matching circuit 8. The core diameter, the number of windings, and the inter- wiring pitch of the helical antenna are set, so that the impedance of the helical antenna in a use frequency becomes inductive.
Bibliography:Application Number: JP19990247186