Communications: radio wave antennas – Antennas – Antenna components
Reexamination Certificate
2005-07-19
2005-07-19
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
Antenna components
C343S771000, C343S7000MS, C333S248000
Reexamination Certificate
active
06919862
ABSTRACT:
A multi layered high impedance structure presents a high impedance to multiple frequency signals, with a different frequency for each layer. Each layer comprises a dielectric substrate, and an array of radiating elements such as parallel conductive strips or conductive patches on the substrate's top surface, with a conductive layer on the bottom surface of the bottommost layer. The radiating elements of succeeding layers are vertically aligned with conductive vias extending through the substrates to connect the radiating elements to the ground plane. Each layer presents as a series of parallel resonant L-C circuits to an E field at a particular signal frequency, resulting in a high impedance surface at that frequency. The new structure can be used as the substrate for a microstrip patch antenna to provide an optimal electrical distance between the resonator and backplane at multiple frequencies. It can also be used in waveguides that transmit multiple signal frequencies signals in one polarization or that are cross-polarized. As a waveguide it maintains a near-uniform density E and H fields, resulting in near uniform signal power density across the waveguide's cross-section.
REFERENCES:
patent: 4870375 (1989-09-01), Krueger et al.
patent: 5115217 (1992-05-01), McGrath et al.
patent: 5497168 (1996-03-01), Thomas et al.
patent: 6208316 (2001-03-01), Cahill
patent: 6366254 (2002-04-01), Sievenpiper et al.
patent: 6426722 (2002-07-01), Sievenpiper et al.
patent: 6552696 (2003-04-01), Sievenpiper et al.
patent: 2518828 (1983-06-01), None
CRC Press,The Electrical Engineering Handbook 2ndEdition, Dorf, p. 970, (1997).
D. Sievenpiper, “High Impedance Electromagentic Surfaces,” (1999)PhD Thesis, University of California, Los Angeles.
C.M. Liu et al.,Monolithic 40 Ghz 670 Mw HBT Grid Amplifier, (1996) IEEE MTT-S, p. 1123.
M. Kim et al.A Rectangular TEM Waveguide With Photonic Crystal Walls for Excitation of Quasi-Optic Amplifiers, (1999) IEEE MTT-S, Archived on CDROM pp. 1-4.
M.A. Ali et al.,Analysis and Measurement fo Hard Horn Feedsfor the Excitation of Quasi-Optical Amplifiers, (1998) IEEE MTT-S, pp. 1913-1921.
Hacker Jonathan Bruce
Higgins John A.
Kim Moonil
Koppel, Jacobs Patrick & Heybl
Phan Tho
Rockwell Scientific Licensing LLC
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