Antenna with a magnetic interface

Details Antenna with a magnetic interface Antenna with a magnetic interface

2005-02-08

2005-02-08

Vannucci, James (Department: 2828)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S7000MS

Reexamination Certificate

active

06853350

ABSTRACT:
An antenna includes a magnetic interface generator that generates a magnetic interface at a center frequency f0. The magnetic interface generator is a passive array of spirals that are deposited on one layer of a multi-layer substrate. The magnetic interface is generated in a plane at a distance Z above the surface of the substrate layer that it is printed on, where the antenna in printed on a second layer of the multi-layer substrate. The distance Z where the magnetic interface is created is determined by the cell size of the spiral array, where the cell size is based on the spiral arm length and the spacing S between the spirals. The center frequency of the magnetic interface is determined by the average track length DAVof the spirals in the spiral array. The spacing S of the spiral array is chosen to project the magnetic interface to the second layer in the multi-layer substrate so as to improve performance of the antenna that printed on the second layer. The magnetic interface can be used to increase the gain, matching, and bandwidth of a microstrip patch antenna, or other type of antenna.

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