Communications: radio wave antennas – Antennas – Slot type
Patent
1991-05-24
1993-06-15
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Slot type
343789, H01Q 1310
Patent
active
052203379
ABSTRACT:
A cavity with a plurality of notches formed in the edge of the open end. Each notch is fed to establish a notch-type antenna. Notches at 90 angles from each other are formed for a monopulse application. A coaxial feed line is used where the outer conductor is connected at one side of the notch and the inner conductor at the other side. The sizes of the cavity and notches are selected to radiate energy of a selected frequency bandwidth. Additional cavities of different sizes for radiating different selected frequencies are nested concentrically together to form a multifrequency antenna array with a common phase center. Each cavity has a plurality of notches and each cavity may be rotated in relation to the adjacent cavity to misalign the notches between the two cavities and thereby increase isolation between frequency bands.
REFERENCES:
patent: 2600179 (1952-06-01), Alford
patent: 2803008 (1957-08-01), Lindenblad
patent: 2976534 (1961-03-01), Kampinsky
patent: 4129871 (1978-12-01), Johns
patent: 4763130 (1988-08-01), Weinstein
Denson-Low Wanda K.
Ho Tan
Hughes Aircraft Company
Wimer Michael C.
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