Protector for one or more electromagnetic sensors

Details Protector for one or more electromagnetic sensors Protector for one or more electromagnetic sensors

1996-08-16

1999-01-19

Wong, Don

Communications: radio wave antennas

Antennas

Antenna components

343708, 343872, H01Q 1502

Patent

active

058618600

ABSTRACT:
A frequency-selective surface designed to transmit (allow to pass through) electromagnetic radiation around one or more predetermined transmission frequencies. The frequency-selective surface comprises at least two layers, whereby the outer layer is made up of at least one electromagnetic reflecting layer with a periodic pattern of conductive elements. The periodic pattern of conductive elements is made to have a reflection resonance frequency for electromagnetic radiation which is of the order of three times higher than the desired transmission frequency. The inner layer is placed at a suitable predetermined distance from the outer layer. The inner layer is made up of at least one electromagnetic transmitting layer having a periodic pattern of aperture elements. The periodic pattern of aperture elements is made in order to have a transmission resonance frequency for electromagnetic radiation which is substantially the same as the desired transmission frequency.

REFERENCES:
patent: 4851858 (1989-07-01), Frisch
patent: 5103241 (1992-04-01), Wu
patent: 5162809 (1992-11-01), Wu
patent: 5208603 (1993-05-01), Yee
patent: 5563614 (1996-10-01), Alden et al.

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