Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1993-01-15
1994-10-18
Hille, Rolf
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343771, 343781P, 343840, 343909, 343739, H01Q 322, H01Q 1523, H01Q 1102
Patent
active
053572602
ABSTRACT:
An antenna scanned by frequency variation, comprising: exciter means for producing a plane electromagnetic wave at a given frequency which is variable about a center frequency; and radiating means receiving the plane wave produced by the exciter means and subjecting the plane wave to a plurality of successive reflections, the radiating means including means for allowing a fraction of the plane wave to leak to the outside after each successive reflection in order to enable it to radiate to the outside; the phase shift of the wave between two reflections varying as a function of the frequency of the wave and the set of radiated waves produced in this manner thus having a determined relative phase difference, which is variable as a function of the frequency of the wave generated by the exciter means and which defines transmission having a main lobe whose direction is itself variable as a function of the said frequency. Preferably the radiating means include two facing surfaces, one of which surfaces constitutes a ground surface and the other of which surfaces constitutes a radiating front surface which is permeable to the electromagnetic waves, the antenna further including means for injecting a plane wave at a predetermined angle of incidence between the two surfaces. The invention is particularly suitable for satellite antennas.
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G. von Trentini, Partially Reflecting Sheet Arrays, IRE Trans. on Ant. & Prop., Oct. 1957, pp. 666-671.
Bahl et al., Leaky-Wave Antennas Using Artificial Dielectrics at Millimeter Wave Frequencies, IEEE Trans. on Microwave Theory & Tech., vol. MTT-28, No. 11, Nov. 1980, pp. 1205-1212.
Croney, J., Microwave Journal "Doubly Dispersive Frequency Scanning Antenna (For Two Plane Scanning)", vol. 6, No. 7, Jul. 1963, pp. 76-80.
Ando, M., et al., "Design of a Radial Line Slot Antenna with Improved Input VSWR", Electronics and Communications in Japan, vol. 71, No. 9, Sep. 1988, pp. 76-90.
Kari Markus
Roederer Antonine
Brown Peter Toby
Fish Ron
Hille Rolf
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