Communications: radio wave antennas – Antennas – With housing or protective covering
Patent
1978-07-17
1979-04-03
Lieberman, Eli
Communications: radio wave antennas
Antennas
With housing or protective covering
343909, H01Q 142
Patent
active
041480392
ABSTRACT:
A low reflectivity radome includes an enclosure wall made of foamed plastic material defining a dielectric constant of about 1.08. Stiffening ribs made from reinforced glass fibers with a dielectric constant of about 4.0 are arranged in an orthogonal manner along planes normal to a tangent to the air-side surface of the radome and at least partially embedded in the enclosure wall for compressive strengthening thereof. Different orthogonal arrangements include the ribs being totally embedded within the enclosure wall, the ribs projecting to uniform or different distances from the inside surface of the enclosure wall or the ribs are arranged in closely, spaced-apart pairs and project from the inside surface of the enclosure wall. When the ribs are totally embedded in the foamed plastic material, the distance between the ends of the ribs and each face surface of the enclosure is selected so that incident microwaves undergo identical phase shifts for all parallel paths through the enclosure wall. The foamed plastic material of the enclosure is coated on the air-side surface with matching conductive paint. On the inside surface, quarter-wave ribs are formed within the dielectric material for interface matching.
REFERENCES:
patent: 3780374 (1973-12-01), Shibano et al.
Lieberman Eli
Murray Thomas H.
Poff Clifford A.
The Boeing Company
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