A compact printed triangular monopole antenna for ultrawideband applications

In this article, a printed triangular-shaped monopole antenna is proposed for emerging ultrawideband application. The pro- posed antenna uses a triangular radiating patch which is directly fed by a 50-X microstrip feed line. To improve the impedance bandwidth, a round-corner ground plane has been used. To further improve the impedance bandwidth for the entire band, a microstrip transition (near the antenna front end) has been introduced between the microstrip feed line and the triangular radiator that provides a wide impedance band- width from 1.8 to 15.0 GHz for jS11 j� 210 dB. The proposed antenna has been realized using the FR-4 printed circuit board substrate and occupies a small size of about 24 3 30 3 1.6 mm 3 compared to conven- tional antenna structures. The proposed antenna has nearly omni- directional radiation pattern and moderate gain throughout the operat- ing frequency region. V C 2014 Wiley Periodicals, Inc. Microwave Opt

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