Dual-band octafilar helix antenna
First Claim
1. A dual-band octafilar helix antenna, comprising:
- a first set of four helical radiators matched to a first frequency and disposed on a radiator portion of a support substrate;
a second set of four helical radiators matched to a second frequency and disposed on said radiator portion of said support substrate and interleaved with said first set of radiators;
wherein one of said first and second sets of radiators has a greater length than the other and uses a variable pitch for the helical shape along the portion of its length which extends beyond said other set of radiators; and
at least one feed network formed on a feed portion of said support substrate providing 0°
, 90°
, 180° and
270°
signals to at least one of said first and second sets of radiators.
1 Assignment
0 Petitions
Accused Products
Abstract
A dual-band octafilar helix antenna operational at two frequencies, while maintaining a relatively small package size. The dual-band octafilar antenna is manufactured by disposing radiators and a feed network onto a flexible substrate and forming the substrate into a cylindrical shape to obtain the helical configuration. The dual-band octafilar helix antenna includes four active radiators which are matched to a first frequency and disposed on a radiator portion of the flexible substrate. Four additional radiators, which may be either passive or active radiators, are matched to a second frequency, are also disposed on the radiator portion of the substrate and interleaved with the active radiators. At least one feed network is provided on a feed portion of the substrate that provides 0°, 90°, 180°, and 270° signals to active radiators. The sets of radiators and associated feed networks may be formed on opposing sides of a single substrate or on spaced apart layers in a multi-layered support substrate design.
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Citations
26 Claims
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1. A dual-band octafilar helix antenna, comprising:
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a first set of four helical radiators matched to a first frequency and disposed on a radiator portion of a support substrate; a second set of four helical radiators matched to a second frequency and disposed on said radiator portion of said support substrate and interleaved with said first set of radiators; wherein one of said first and second sets of radiators has a greater length than the other and uses a variable pitch for the helical shape along the portion of its length which extends beyond said other set of radiators; and at least one feed network formed on a feed portion of said support substrate providing 0°
, 90°
, 180° and
270°
signals to at least one of said first and second sets of radiators. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A dual-band octafilar helix antenna, comprising:
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a set of four active radiators matched to a first frequency and disposed on a radiator portion of a microstrip substrate; a set of four passive radiators matched to a second frequency and disposed on said radiator portion of said microstrip substrate and interleaved with said active radiators, said passive radiators being driven by said active radiators; and at least one feed network formed on a feed portion of said microstrip substrate providing 0°
, 90°
, 180° and
270°
signals to said set of active radiators. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification