Image spatial filter

Details Image spatial filter Image spatial filter

1982-04-05

1985-01-22

Lieberman, Eli

Communications: radio wave antennas

Antennas

Antenna components

343753, H01Q 1502

Patent

active

044955065

ABSTRACT:
An image spatial filter comprises back-to-back image cavities with means for coupling energy from one cavity to the other. Large angle of incidence energy is attenuated by each image cavity successively, thus providing a high degree of attenuation. Two quarter wavelength dielectric sheets with a ground plane between them and spaced from each by one-half wavelength form the image cavities. Slots in the ground plane provide coupling from one cavity to the other. Image spatial filters are not substantially more expensive than multi-layer dielectric spatial filters and are as easily fitted to existing antennas. But image spatial filters substantially reduce large angle passbands caused by the Brewster effect and by cavity resonance in dielectric spatial filters.

REFERENCES:
patent: 4021812 (1977-05-01), Schell et al.
patent: 4125841 (1978-11-01), Munk
patent: 4169268 (1979-09-01), Schell et al.
patent: 4314255 (1982-02-01), Kornbau
Chen, Transactions on Microwave Theory and Techniques, vol. MTT-19, No. 5, May, 1971, pp. 475-481.

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