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This work describes the design of high gain, U-slot antennas for RFID 915 MHz (902 – 928 MHz) applications. Four types of antenna were designed, optimized and evaluated – a circular, U-slotted antenna, a rectangular U-slotted antenna, and two 2x1 arrays. All structures are fed using the co-planar wave guide (CPW) feed. Several miniaturization and gain enhancement techniques such as folding, bending...
End-wall waveguide-to-microstrip splitters are highly favourable to feed series' fed microstrip arrays. The presented topology of a double slot microstrip transition clearly shows distinct advantages. To investigate the effect of substrate material and thickness on this kind of transition three different substrates are used for the transition design. Simulation and measurement results are compared...
In this paper different approaches for the numerical calculation of Green's functions of printed structures with two-dimensional (2-D) periodicity are presented. Recurring to specific asymptotic extractions, several techniques can be used to improve the efficiency of the procedure for a specific geometry. Choices are possible among different asymptotic functions and/or different interpolation algorithms...
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