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Fundamental superstrate (cover) effects on printed circuit antennas

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2 Author(s)
Alexopoulos, N. ; University of California, Los Angeles, CA, USA ; Jackson, D.R.

The fundamental effects of superstrate (cover) materials on printed circuits antennas are investigated. Substrate-superstrate resonance conditions are established which maximize antenna gain, radiation resistance, and radiation efficiency. Criteria are determined for material properties and dimensions for which surface waves are eliminated and a radiation efficiency due to substrate-superstrate effects of e_{s} = 100 percent is obtained. Criteria for nearly omnidirectional \bar{H} -plane patterns and nearly omnidirctional \bar{E} -plane patterns are presented. Finally, a general criterion is given for choosing a superstrate to optimize efficiency for the important case of nonmagnetic layers with the antenna at the interface.

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Antennas and Propagation, IEEE Transactions on  (Volume:32 ,  Issue: 8 )