MINIATURE LOW PROFILE UWB ANTENNA: NEW TECHNIQUES FOR BANDWIDTH ENHANCEMENT AND RADIATION PATTERN STABILITY

A miniature (30 X 10 mm(2)) efficient planar monopole antenna with stable radiation pattern for UWB applications (3.1-10.6 GHz) is proposed in this paper. These characteristics, wide bandwidth and radiation stability, are achieved by using original design solutions with maintaining a small size and good efficiency of the system. Based on modified ground plane and loop feeding structure, the first design solution consist to propose a simple technique which not requires any discrete additional elements or circuits and does not affect the overall dimensions of the basic structure. This technique enhances the (-6 dB) bandwidth of the planar monopole antenna by approximately 50% compared to the basic structure while maintaining the same dimension (30 X 10 mm(2)). The optimized proposed antenna presents a large bandwidth, good radiation stability, total efficiency higher than 70% over the entire band and small size (30 X 10 mm(2)) which will enable to use it in different UWB applications. In the second step, two L slots are added in the printed circuit board of the proposed UWB antenna to reach a good stability of the radiation pattern on the overall desired band. (C) 2016 Wiley Periodicals, Inc.