Planar ultra‐wideband printed wide‐slot antenna using fork‐like tuning stub

Abstract

A printed wide-slot antenna with a centred rectangular parasitic patch, fed by a fork-like tuning stub with rectangular parasitic elements adjacent to the main feed line is proposed and discussed. The proposed wide-slot antenna eliminates the need of rotation of the slot and parasitic patches both in the ground plane for the improvement in impedance bandwidth. The experimental results indicate that the presented antenna has a bandwidth (−10 dB) of more than 148% ranging from 2 to 13.5 GHz. The total size of the proposed antenna configuration is 44.3 × 44.3 × 0.508 mm 3 .Introduction: Printed wide-slot antennas are attractive because of their wide impedance bandwidth and they have received much attention in wireless communication systems. A simple wide-slot antenna with a fork-like tuning stub and a simple tuning stub has been reported for an impedance bandwidth of 50% [1]. The rotation at a particular angle of the wide square slot, with fractal geometry and with rotated parasitic patches fed by a simple microstrip line of 50 Ω impedance enhances the bandwidth of the antenna at a certain level [2][3][4]. A bandwidth of more than 80% is achieved from 2.23 to 5.35 GHz [4]. The diamond-shaped tuning stub and also a pair of parasitic patches along the feed line close to the feeding end also increases the impedance bandwidth by up to 136 and 123%, respectively, as reported in [5,6]. However, it is not enough to cover more wireless communication services. In this Letter, we present a printed rectangular wide-slot antenna with a centred rectangular parasitic patch fed by a fork-like tuning stub and two rectangular stubs with one-sided curved corners added in parasitic to the feed line near the port to enhance the bandwidth of the antenna by up to 148% at a centre frequency of 7.75 GHz.

Wideband Printed Wide-Slot Antenna with Fork-Shaped Stub

“…In [22], a printed elliptical slot antenna using a tapered microstrip feeding line with a fork-shaped tuning stub achieved an impedance BW of 117% for S 11 < −10 dB. In [23], a printed WS antenna with a centered rectangular parasitic patch, fed by a fork-like tuning stub with rectangular parasitic elements is proposed, with an impedance BW of 148.4% for S 11 < −10 dB. It has been demonstrated that designs using a fork-shaped stub are an effective way to obtain broadband impedance matching.…”

A compact slot antenna with improved bandwidth and gain for wireless applications

“…5 represents the comparison between the simulated and measured gain of the fabricated antenna. The gain is improved as compared to the reference antenna [11] for the frequency range of 1.8-6.1 GHz. The measured gain varies from 3.3-8.25 dB with a maximum value of 8.25 dB at 10.5 GHz.…”

“…Introducing a patch at the slot provides additional surface current path creating more resonance and improving the bandwidth [10]. In this paper, a slot antenna is proposed based on the work of [11]. Off-set feed line [12][13][14][15] is used to reduce the size of the antenna and to enhance the bandwidth further improvement in the bandwidth is observed by using dual SRR and semicircular slots in the ground plane.…”

A Novel Miniaturized Vivaldi Antenna for Ultra-Wideband Applications

“…UWB antenna has been widely used not only in military and civil wireless communication, but also in biomedical detection, because of its unique features such as broad impedance bandwidth and high speed data rate [2,3]. After the Federal Communication Commission (FCC) approved the opening of 3.1-10.6 GHz band to the business in 2002 [4], various kinds of UWB antennas have been studied and designed, such as Vivaldi antenna, printed monopole antenna, and wide slot antenna [5][6][7].…”