Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Reexamination Certificate
2007-06-26
2007-06-26
Chen, Shih-Chao (Department: 2821)
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
C343S756000, C343S909000
Reexamination Certificate
active
10949158
ABSTRACT:
An electromagnetic medium is described, the electromagnetic medium comprising a periodic array patterned to provide at least one photonic bandgap and to provide negative refraction for incident radiation at an operating frequency lying within the at least one photonic bandgap. The periodic array includes an externally powered gain material having an amplification band that includes the operating frequency.
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Chen Shih-Chao
Hewlett--Packard Development Company, L.P.
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