Communications: radio wave antennas – Antennas – Slot type
Patent
1977-11-11
1980-06-17
Lieberman, Eli
Communications: radio wave antennas
Antennas
Slot type
343789, H01Q 1310, H01Q 1318
Patent
active
042086604
ABSTRACT:
An array antenna is disclosed wherein each one of the antenna elements includes at least two concentric slots formed in a conductive sheet. The conductive sheet is disposed on a dielectric support and a ground plane is found on the opposite surface of such support. The inner one of the slots enables the outer slot to radiate radio frequency energy having a wavelength greater than the circumference of such outer slot. When such antenna includes an additional concentric slot the antenna is adapted to operate over a pair of frequencies separated by greater than twenty percent while enabling the array antenna to have satisfactory grating lobe characteristics.
REFERENCES:
patent: 3791769 (1957-05-01), Lindenblad
patent: 3971125 (1976-07-01), Thies
Lieberman Eli
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
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