Spiral antenna with selectable impedance

Communications: radio wave antennas – Antennas – Spiral or helical type

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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.

REFERENCES:
patent: 2856605 (1958-10-01), Jacobsen
patent: 2958081 (1960-10-01), Dyson
patent: 3131394 (1964-04-01), Wheeler
patent: 3188643 (1965-06-01), Dyson et al.
patent: 3229293 (1966-01-01), Little et al.
patent: 3344425 (1967-09-01), Webb
patent: 3381297 (1968-04-01), Zisler et al.
patent: 3599220 (1971-08-01), Dempsey
patent: 3717878 (1973-02-01), Mosko
patent: 3778839 (1973-12-01), Kovar
patent: 3836979 (1974-09-01), Kurland et al.
patent: 4243993 (1981-01-01), Lamberty et al.
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.
Kaiser, IEEE Trans. on Antennas and Prop., vol. AP-15, No. 2, Mar. 1967, pp. 304-305.

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