Antenna apparatus

Details Antenna apparatus Antenna apparatus

2008-07-08

2010-12-07

Wimer, Michael C (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S909000

Reexamination Certificate

active

07847737

ABSTRACT:
An antenna apparatus includes a patch antenna unit in which a radiation conductor and a ground conductor plate are arranged so as to face each other with an insulating material disposed therebetween, a power-feed point is provided at a position slightly offset from the center of the radiation conductor, and a high-frequency electric field is supplied between the radiation conductor and the ground conductor plate; a surface-wave propagation suppression area in which a surface-wave propagation suppression mechanism for suppressing surface-wave propagation is mounted in an outer surrounding area in the offset direction of the power-feed point in which an electric-field intensity is generally maximum within the end portion of the radiation conductor plate; and an insulating area in which an electric-field intensity between the radiation conductor plate and the ground conductor plate is relatively low and the surface-wave propagation suppression mechanism is not arranged.

REFERENCES:
patent: 6307508 (2001-10-01), Nagasawa
patent: 7471247 (2008-12-01), Saily et al.
patent: 2008/0204347 (2008-08-01), Alvey et al.
patent: 11-103213 (1999-04-01), None
D. Sievenpiper, et al., “High-Impedance Electromagnetic Surfaces with a Forbidden Frequency Band”, IEEE Transactions on Microwave Theory and Techniques, vol. 47, No. 11, pp. 2059-2074 (1999).

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