The possibility of using non-Foster circuit to expand the bandwidth of a monopole antenna is investigated theoretically. Beginning with an inductor-loaded monopole antenna resonating at different frequencies by changing the value of the loaded inductor, we show that a frequency-dependent inductor is needed to enhance the bandwidth of the monopole antenna. The curve for the reactance of the freq...

This paper presents the results of a new monopole antenna that exhibits 2.75-10.7 GHz performance. The proposed antenna consists of a radiating patch with notches excited by capacitive coupling feed. Also, the antenna’s truncated ground-plane incorporates a central notch. This modification significantly improves the antenna’s impedance bandwidth by 118% over an ultra-wideband frequency range. T...

In this paper, a novel wideband microstrip-fed quasi-Yagi antenna is presented. The proposed quasi-Yagi antenna consists of a microstrip-fed monopole, three radiating patches (two square patches and a rectangular patch), and three parasitic strip elements as the function of reflector. In order to achieve wide bandwidth, two parasitical patches are etched on both sides of the substrate. Furtherm...

A compact triple T-shaped stub with meander loaded strip antenna for penta band applications is proposed. The rectangular patch meandered and open-ended slot cuts utilized to realize four operating bands at 2.45 GHz, 3.1 5.3 6.5 GHz an impedance bandwidth of 400 MHz (2.15-2.550 GHz), 1000 (2.7-3.7 200 (5.4-5.6 (6.4-6.6 respectively. For additional resonance frequency, the length central slightl...