Communications: radio wave antennas – Antennas – Slot type
Patent
1991-11-15
1992-12-29
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Slot type
343771, H01Q 1310, H01Q 2120
Patent
active
051755610
ABSTRACT:
An inner-feed-type planar antenna of single-layered structure excited by an axially symmetric mode for propagating radio waves from the center toward the outer periphery within a propagation layer having an antenna surface. If the planar antenna is used for transmission, it is provided with a plurality of coupling slots formed and arrayed in one surface of an axially symmetric mode waveguide member in such a manner that the coupling factor of the external radiation is high at the outer periphery and becomes successively lower as the center is approached. A spiral or ring-shaped terminating slot is provided in the antenna surface at the outer portion of the axially symmetric mode waveguide member. A region not coupled with the outer portion is provided at the center of the antenna surface. Furthermore, the planar antenna is provided with a reflector member arranged along the terminating slot for reflecting a propagating radio wave between the inner and outer portions of the axially symmetric mode waveguide member. A comparatively flat aperture distribution in which the electromagnetic field is uniform can be obtained. In addition, by providing the central portion with a non-radiating region, long-line effect is suppressed and bandwidth enlarged.
REFERENCES:
patent: 2929064 (1960-03-01), Kelly
patent: 3235869 (1966-02-01), Van Atta et al.
patent: 4536767 (1985-08-01), Rembold et al.
patent: 4581614 (1986-04-01), LaCourse
Kelly, "Recent Annular Slot Array Experiments", IRE National Convention Report, Part 1, Mar. 18-21, 1957 pp. 144-152.
IEEE Transactions on Antennas and Propagation, vol. AP-33, No. 12, Dec. 1985.
IEEE Transactions on Antennas and Propagation, vol. AP-35, No. 10, Oct. 1986.
IEEE Transactions on Antennas and Propagation, vol. 36, No. 9, Sep. 1988.
IEEE Transactions on Antennas and Propagation, vol. 36, No. 12, Dec. 1988.
1989 Spring National Convention Record, The Institute of Electronics, Information and Communication Engineers, Mar. 28-31, 1989.
Antenna Theory, part 1, Inter-University Electronics Series, vol. 7.
Radial Antenna Laboratory, Ltd.
Wimer Michael C.
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