Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1979-11-13
1981-01-06
Lieberman, Eli
Communications: radio wave antennas
Antennas
Spiral or helical type
H01Q 136
Patent
active
042439930
ABSTRACT:
Spiral antennas are disclosed wherein each antenna arm includes one or more choke elements that resonate at predetermined operating frequencies to eliminate or minimize undesired radiation and reception characteristics. Multi-arm arrangements for broadband applications requiring sum and difference mode operation with both right-hand and left-hand circularly polarized radiation characteristics are attained by including a plurality of selectively positioned and dimensioned choke elements in each antenna arm. A variety of transmission line sections, suitable for use as choke elements in several types of spiral antennas, is described.
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Andrews George S.
Lamberty Bernard J.
Lieberman Eli
The Boeing Company
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