Abstract
This paper presents two novel designs of truncated rhombus-like slotted antenna (TRLSA) based on aperture-coupled feeding technique. In conventional antennas, difierent patch dimensions are required to accommodate difierent frequencies which normally result in bigger antenna structures. Therefore, this paper proposes a unique structure of 'zig-zag' slot embedded on two difierent antennas to achieve two difierent resonant frequencies but of the same patch dimensions. An analysis on design transformation which includes comparative simulation results of two reference antennas and TRLSAs has also been presented to provide better understanding on the design concept. CST Microwave Studio software has been used for design simulations and optimizations. The simulation and measurement results of TRLSAs are also presented. The results conflrm that the antennas can operate at two difierent frequencies, 5.3GHz and 5.8GHz with the same patch dimensions by integrating the 'zig-zag' slot at two difierent orientations in x- and y-axis respectively. Hence, size reduction is achieved for lower frequency patch which gives a great advantage for future development of a frequency reconflgurable antenna in an array conflguration.
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