Phase correcting reflection zone plate for focusing microwave

Phase correcting reflection zone plate for focusing microwave

PCT No. PCT/GB91/01136 Sec. 371 Date Aug. 9, 1993 Sec. 102(e) Date Aug. 9, 1993 PCT Filed Jul. 10, 1991 PCT Pub. No. WO92/01319 PCT Pub. Date Jan. 23, 1992.A zone plate for focusing microwave energy is provided comprising a plurality of reflective portions corresponding to zones of the zone plate, e...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: COLLINGE, GARY, WRIGHT, THOMAS M. B
Format: Patent
Sprache:eng
Schlagworte:
ANTENNAS, i.e. RADIO AERIALS
BASIC ELECTRIC ELEMENTS
ELECTRICITY
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Zusammenfassung:PCT No. PCT/GB91/01136 Sec. 371 Date Aug. 9, 1993 Sec. 102(e) Date Aug. 9, 1993 PCT Filed Jul. 10, 1991 PCT Pub. No. WO92/01319 PCT Pub. Date Jan. 23, 1992.A zone plate for focusing microwave energy is provided comprising a plurality of reflective portions corresponding to zones of the zone plate, each reflective portion reflecting energy lambda /P out of phase with respect to adjacent reflective portions, where lambda is the wavelength of the energy. The reflective portions are positioned in P parallel planes mounted on low dielectric loss sheets and separated by a distance of lambda /2P such that energy reflected from the reflective portions constructively interfere at a focus of the zone plate.