Title:
誘電体装荷アンテナ及びアンテナアセンブリ
Document Type and Number:
Japanese Patent JP5172857
Kind Code:
B2
Abstract:
A dielectrically loaded quadrifilar helical antenna has four quarter turn helical elements centered on a common axis. Each helical element is metallized on the outer cylindrical surface of a solid dielectric core and each has a feed end and a linked end, the linked ends being connected together by a linking conductor encircling the core. At an operating frequency of the antenna the helical elements and the linking conductor together form two conductive loops each having an electrical length in the region of (2n−1)/2 times the wavelength, where n is an integer. Such an antenna tends to present a source impedance of at least 500 ohms to receiver circuitry to which it is connected. The invention includes an antenna assembly including a dielectrically antenna and a receiver having a radio frequency front-end stage with a differential input coupled to the feed ends of the helical elements.
Inventors:
Raison, Oliver Paul
Application Number:
JP2009538772A
Publication Date:
March 27, 2013
Filing Date:
November 27, 2007
Export Citation:
Assignee:
Sarantelle Limited
International Classes:
H01Q11/08; H01Q7/00
Domestic Patent References:
| JP4026203A | ||||
| JP5014043A | ||||
| JP2003501852A | ||||
| JP2001127528A | ||||
| JP2004120168A | ||||
| JP2002064324A | ||||
| JP1316004A | ||||
| JP8016718A | ||||
| JP10013149A | ||||
| JP2005524326A |
Foreign References:
| WO2006051257A1 |
Attorney, Agent or Firm:
Yoshiyuki Kawaguchi
Hidemi Matsukura
Mayuko Wakuda
Tsutomu Toyama
Hidemi Matsukura
Mayuko Wakuda
Tsutomu Toyama
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