Microwave active notch filter and operating method with photonic

Details Microwave active notch filter and operating method with photonic Microwave active notch filter and operating method with photonic

1996-12-21

1998-10-06

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333202, H03H 700, H01P 120

Patent

active

058183094

ABSTRACT:
An active microwave notch filter is formed by connecting a photonic bandgap crystal (PBC) in a feedback loop around a microwave amplifier. The PBC has an attenuation bandgap which establishes a frequency range of preferential amplification. Frequency selectivity can be achieved by applying signals to the dielectric members which form the PBC to vary their dielectric constants, and thus the bandgap, or by selecting among multiple parallel PBCs. Antennas are provided to transduce the electrical input to the PBC into electromagnetic radiation, and then back to an electrical signal after the radiation has been filtered by the PBC.

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Joannopoulos et al., Photonic Crytals-Molding the Flow of Light, Princeton University Press, 1995, pp. 40-43, 94-97 and 121-126.
Yablonovitch, "Photonic band-gap structures", Journal of the Optical Society of America B, vol. 10, No. 2, Feb. 1993, pp. 283-295.

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