Communications: radio wave antennas – Antennas – Slot type
Patent
1987-01-23
1989-04-25
Sikes, William L.
Communications: radio wave antennas
Antennas
Slot type
343768, H01Q 1310
Patent
active
048252190
ABSTRACT:
Disclosed is a circular waveguide in which a slots are formed which are shaped and disposed such that they interrupt either the right hand or left hand circulating mode (RC and LC respectively) residing in the waveguide. Locating the slots in the waveguide wall is accomplished in accordance with the theory that for TE modes in circular waveguide with circumferential variation of e.sup..+-.jm.phi., current flow lines are produced that are helical. The slots are located so as to interrupt the helical current of the desired mode. In one embodiment, an ortho-polarization mode transducer and a circular polarizer are used to feed the slotted waveguide. By control of the amplitude and phase of the energy propagating in the waveguide, aximuthal pattern control can be effected. By dielectric loading the waveguide to make .lambda..sub.g in the loaded waveguide equal to .lambda.-free space, endfire radiation can be achieved.
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Hughes Aircraft Company
Johnson Doris J.
Karambelas A. W.
Runk Thomas A.
Sikes William L.
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