A novel microstrip slot antenna for UWB (Ultra Wideband) antenna applications is proposed. A slot antenna is filled by an isosceles triangle. This structure is fed by a single microstrip line with a fork-like tuning stub. Experiments are carried out to investigate its return loss, its radiation and its time domain behavior, which exhibit good radiation pattern and impedance bandwidth over the entire band of frequency. Time domain consideration also exhibits that this antenna can be used with short pulses.

This article presents the results of a compact modified triangular CPW‐fed antenna that exhibits multioctave performance. This modification significantly improves the antenna's impedance bandwidth by 198% over an ultra‐wideband (UWB) frequency range from 3.06 to 35 GHz. The return‐loss (S11) performance over this frequency range is designed to be better than −10 dB. These characteristics make the proposed antenna an excellent candidate for numerous UWB applications and next generation communication systems. The key physical parameters affecting the antenna's frequency characteristics have also been investigated to determine optimum antenna performance. The antenna's measured return loss and E‐plane and H‐plane radiation patterns show a very good correlation with the requirements of UWB applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:69–72, 2015

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A new microstrip slot antenna for UWB (Ultra Wideband) applications is designed. This structure is a quasi-triangle slot antenna fed by a single microstrip line with a fork-like tuning stub. Experiments are carried out to investigate its return loss, its radiation and its time domain behavior, which exhibit good radiation pattern and impedance bandwidth over the entire band of frequency. Time domain consideration also exhibits that this antenna can be used with short pulses.

The first aim of this work is to design a new geometry of printed helix antennas in a simple structure that only uses planar FR4 substrates, unlike conventional wire helix antennas. The main body of helix comprises four rectangular substrates containing helix arms forming a box. The printed helix arms are designed in a way that they meet each other in the edges of substrates when placed next to one another. The most important advantages of this work are introducing a method that makes the helix antenna fabrication and also the impedance matching procedure simpler. The presented helix antenna has endfire radiation in Z-direction with circular polarization suitable for Land S-bands applications. Simulated and measured results show that the proposed antenna has