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US 4,400,703 AGranted
Spiral array antenna
AssigneeKokusai Denshin Denwa Kabushiki Kaisha
InventorsTakayasu Shiokawa, Yoshio Karasawa
Life of this patent
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Abstract
A compact and light weight array antenna with a gain of approximately 13 dB comprises a plurality of axial-mode helical antennas with an antenna height of 0.4.about.0.6.lambda. (.lambda.: Wavelength) as element antennas, having cylindrical metallic rims with a rim height of approximately 0.25.lambda. surrounding each corresponding element antenna in order to suppress the characteristic degradation of the device caused by the mutual coupling of element antennas.
Claims3
An array antenna comprising:
- a plurality of element antennas disposed closely adjacent to one another, each of said element antennas comprising an axial-mode helical antenna with an antenna height of 0.4.lambda. to 0.6.lambda. (.lambda.:
- Wave length);
- and
- a plurality of cylindrical metallic rims coaxially surrounding the said element antennas, respectively, for suppressing degradation of antenna characteristics caused by mutual coupling between the said element antennas, each of said metallic rims having a height of approximately 0.25.lambda..
1 more element
Dependencies are inferred from the claim text.