Dual polarization frequency selective medium for diplexing two c

Details Dual polarization frequency selective medium for diplexing two c Dual polarization frequency selective medium for diplexing two c

1999-04-29

2000-04-25

Le, Hoanganh

Communications: radio wave antennas

Antennas

Antenna components

343700MS, H01Q 1502, H01Q 1524

Patent

active

06054967&

ABSTRACT:
A frequency selective medium that is adapted to receive an incident electromagnetic radiation at an angle of incidence of about 45.degree. has two arrays of conductive elements on opposite parallel surfaces (20, 22) of a dielectric substrate. In one embodiment, the conductive elements are cross-dipoles (6) each having a horizontal dipole (10) and a vertical dipole (8) of different lengths and widths. In another embodiment, the conductive elements comprise a plurality of conductive gridded rectangular loops (40). The frequency selective medium allows incident waves that are within a passband of transmit frequencies to transmit through the medium, and reflects waves at frequencies within a stopband adjacent the passband. In other embodiments, meanderline polarizers (28) are added to cross-dipole and gridded rectangular loop frequency selective media to circularly or dual-linearly polarize incident linearly polarized waves.

REFERENCES:
patent: 5162809 (1992-11-01), Wu
patent: 5373302 (1994-12-01), Wu
patent: 5543809 (1996-08-01), Profera, Jr.
Chao-Chun Chen, "Scattering by a Two-Dimensional Periodic Array of Conducting Plates," IEEE Transactions on Antennas and Propagation, vol. AP-18, No. 5, Sep. 1970, pp. 660-665.
Chao-Chun Chen, "Transmission of Microwave Through Perforated Flat Plates of Finite Thickness," IEEE Transactions on Microwave Theory and Techniques, vol. MTT-21, No. 1 Jan. 1973, pp. 1-6.
Leo Young, Lloyd A. Robinson and Colin A. Hacking, "Meander-Line Polarizer," IEEE Transactions on Antennas and Propagation, May 1973, pp. 376-378.

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