Title :
Removal of surface-wave induced radiation nulls for patch antennas integrated with vehicle windscreens
Author :
Sambell, Alistair ; Lowes, Philip ; Korolkiewicz, Edward
Author_Institution :
Dept. of Electr. & Electron. Eng. & Phys., Univ. of Northumbia, Newcastle upon Tyne, UK
fDate :
1/1/1997 12:00:00 AM
Abstract :
A solution to the problem of radiation nulls for patch antennas integrated with vehicle windscreens is presented. The nulls, attributable to surface waves within the windscreen superstrate, are removed by the addition of a thin resistive film to the windscreen surface. Analysis of the surface-wave modes at 5.8 GHz within two typical laminated windscreen structures coated with a resistive film shows a sheet resistance value of 50 Ω/sq to be appropriate. Polar-pattern results demonstrate the effectiveness of the technique in removing the radiation nulls without significantly reducing the forward gain
Keywords :
antenna accessories; antenna radiation patterns; interference suppression; microstrip antennas; mobile antennas; radiofrequency interference; road vehicles; surface electromagnetic waves; forward gain; laminated windscreen structures; patch antennas; polar-pattern results; resistive film; sheet resistance; surface-wave induced radiation nulls; thin resistive film; vehicle windscreens; windscreen superstrate; Attenuation; Automotive components; Dielectrics; Maxwell equations; Null value; Patch antennas; Surface resistance; Surface waves; Tellurium; Vehicles;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
