Quasi-omnidirectional dual-band back-to-back E-shaped patch antenna for laptop applications

A novel dual-band low profile antenna to be integrated into a laptop screen cover rim is presented. In spite of the laptop's large ground plane, the antenna exhibits quasi-omnidirectional properties in both operating bands. The two resonant frequencies can be tuned independently within a broad range of ratio 1.2-3.5 without changing the patch external dimensions.     

Microstrip antenna analysis using the method of fundamental solutions

The method of fundamental solutions (MFS) is proposed for the analysis of microstrip patch antennas of arbitrary shape. The MFS consists mainly in approximating the solution of a problem by a linear combination of known fundamental solutions associated with source points located outside the domain. The implementation of the MFS is simple and computationally efficient. Simulation results are obtained for rectangular, circular and triangular microstrip patch antennas. The resonance frequency and input impedance results are in good agreement with those published in the literature. Two prototypes have been fabricated and tested. Good agreement has been obtained between the MFS simulations and the experimental results. Copyright © 2008 John Wiley & Sons, Ltd.     

Leaky and surface waves in anisotropic printed antenna structures

The behavior of the leaky- and surface-wave modes supported by single- and double-layered grounded anisotropic dielectric structures is investigated. Simple low-frequency and high-frequency asymptotic formulas are derived for the wavenumbers. The effects of dielectric anisotropy and losses on the cutoff frequency of the TM and TE surface waves and on the H-plane radiation pattern of a leaky-wave antenna are examined