Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1983-09-30
1986-12-16
Lieberman, Eli
Communications: radio wave antennas
Antennas
Spiral or helical type
343153, H01Q 136
Patent
active
046300643
ABSTRACT:
A monopulse spiral antenna system of the type having a minimum of three, interwound spiral arms for multimode, direction of arrival sensing, is disclosed in which the antenna arms are shaped and arranged in an overlapping configuration that allows the interarm impedance of the antenna to be adjusted, substantially independently of other electrical properties of the antenna, for matching of the antenna impedance of a mode forming network while preserving the broadband, directional capabilities of the antenna. Several different embodiments of the impedance adaptive antenna are disclosed including a preferred, eight-arm exponential spiral in which the arms are conductive strips transversely inclined relative to a plane formed by the spiral so that opposed and parallel surfaces of adjacent arm strips create a dominant interarm capacitance that in turn determines the overall input impedance of the antenna. Furthermore, the opposed, proximate surfaces of the strip-shaped arms are dimensioned, spaced and inclined at an angle that adapts the input impedance of the antenna to a value matching that of the mode forming network.
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Bullock et al., "An Analysis of Wide Band Microwave Monopulse Direction-Finding Techniques," IEEE Trans. on Aerospace and Electronic Systems, vol. AES-7, No. 1, Jan. 1971, pp. 188-203.
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Andrews George S.
Blakney Thomas L.
Connell Douglas D.
Lamberty Bernard J.
Lee James R.
Lieberman Eli
The Boeing Company
Wimer Michael C.
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