Apparatus and a method relating to antenna systems

Details Apparatus and a method relating to antenna systems Apparatus and a method relating to antenna systems

1998-04-28

2000-01-25

Wong, Don

Communications: radio wave antennas

Antennas

Microstrip

343767, H01Q 138

Patent

active

060183209

ABSTRACT:
An antenna system (100) comprises a substantially planar electrically conductive ground plane (102) with an aperture (103), a substantially planar signal feed structure (104) parallel to the ground plane (102) and a substantially planar first dielectric layer (123) between the ground plane and the feed structure (104). The aperture (103) is in a shape of a first slot (105) orthogonally intersecting a second slot (106) at an intersection point (SIP). The feed structure (104) comprises a first feed unit (107) intersecting the second slot (106) asymmetrically with respect to the first slot (105), and a fork shaped second feed unit (108) comprising two feed arms (110,111). The feed arms (110,111) intersect the first slot (105) on either side of the slot intersection point (SIP), symmetrically with respect to the second slot (106). When used as a transmitting antenna, a first signal (Si) is fed through the first feed unit (107) and a second signal (S2) is fed through the second feed unit (108) to respective associated slot (105,106). The signals (S1,S2) excite the aperture (103) to radiate two substantially orthogonal linearly polarized signals.

REFERENCES:
patent: 4486758 (1984-12-01), de Ronde
patent: 4825220 (1989-04-01), Edward et al.
patent: 4903033 (1990-02-01), Tsao et al.
patent: 5241321 (1993-08-01), Tsao
J.R. Sanford et al., "A Two Substrate Dual Polarised Aperture Coupled Patch", pp. 1544-47, Department of Microwave Technology, Chalmers University of Technology, Gothenburg, Sweden, 1996.

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