US 6,204,827 B1Granted

Antenna feeding circuit

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsTsutomu Endo, Toru Fukasawa, Moriyasu Miyazaki, Isamu Chiba

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Abstract

An object of the present invention is to provide an antenna feeding circuit, which requires no balance-unbalance converter and has a simplified structure. The object is attained, by an antenna feeding circuit, according to the present invention, in which micro-strips lines are constituted from one or more pair(s) of band conductors (5a, 5b) disposed on the outer surface of the cylindrical body (1) and an inner conductor (6) disposed on the whole of the inner surface of the cylindrical body (1). A 180 degree distributor (2) supplies electric power to the band conductors (5a, 5b) so that the phase difference between the currents in the band conductors (5a, 5b) is 180 degrees. Inutile current induced in the inner surface of the inner conductor can be cancelled out, because the inner conductor 6 is disposed on the whole of the inner surface of the cylindrical body (1).

Claims9

Dependent claims

An antenna feeding circuit comprising:

a cylindrical body;
said cylindrical body having an inner and an outer surface;
an inner conductor disposed on the inner surface of the cylindrical body;
one or more pairs of electrically conductive bands disposed on the outer surface of the cylindrical body at a position symmetrical with respect to the axis of the cylindrical body so as to be parallel with the longitudinal direction of the cylindrical body, wherein each of electrically conductive bands has a first end and a second end for connecting an antenna element of a helical antenna;
one or more 180 degree distributors, connected to the first end of each of the band conductors, for supplying electric current to each of the band conductors through the first end, so that the phase difference between the electric currents in the band conductors is 180 degrees;
wherein each of the electrically conductive bands induce an inverse inutile current in the inner conductor.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/404,380Filed 24 Sep 1999
Priority: JP 10-27330428 Sep 1998
Granted: 20 Mar 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H01Q 1/36
Details of, or arrangements associated with, antennas: structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials…
H01Q 1/362
Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith: for broadside radiating helical antennas
H01Q 1/38
Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith: formed by a conductive layer on an…
H01Q 11/08
Non-resonant antennas, e.g. travelling-wave antenna: helical antennas