Design and analysis of wideband U-slot patch antenna with U-shaped parasitic elements

Abstract

A single layer single probe‐fed wideband microstrip antenna is presented and investigated. By cutting a U‐slot in the rectangular patch, and by incorporating two identical U‐shaped parasitic patches around both the radiating edges and the nonradiating edges of the rectangular patch, three resonant frequencies are excited to form the wideband performance. Details of the antenna design is presented. The measured and simulated results are in good agreement, the measured impedance bandwidth is 1.44 GHz (4.82‐6.26 GHz), or 26.2% centered at 5.5 GHz, which covers WLAN 5.2 GHz ( 5.15‐5.35 GHz), WLAN 5.8 GHz ( 5.725‐5.825 GHz), and WIMAX 5.5 GHz ( 5.25‐5.85 GHz) bands. The measured peak gains at the three resonant frequencies are 7.73 dB, 7.01 dB, and 4.55 dB, respectively. An equivalent circuit model which is based on the transmission line theory, the asymmetric coupled microstrip lines theory, and the π‐network theory is established. This equivalent circuit model is used to give an insight into the wideband mechanism of the proposed antenna, and is also used to explain why the three resonant frequencies shift at the variations of different parameters from a physical point of view. The error analysis is given to demonstrate the validity of the equivalent circuit model.

A Compact Printed Monopole Antenna for WiMAX/WLAN and UWB Applications

“…The relative bandwidth of the antenna proposed in this paper reached 64.31% in the high-frequency band, which is far superior to that of the reference antennas [5,19,20]. This paper focuses on miniaturization [21] and high-frequency bandwidth [22] and the proposed antenna has great advantages in the above aspects. In the future, this antenna can be applied in the field of high-frequency broadband antennas.…”

Design of multiband fractal antenna loaded with parasitic elements for gain enhancement

“…The comparison of the proposed antenna with the recent implementations in various research works is shown in Table 2. It is observed that the proposed antenna is very compact in its size and provides more gain when compared with Refs.. [7][8][9][10][11][12][13][14] F I G U R E 1 4 Current distributions at 2.07 GHz The realized antenna model and its measurement using a vector network analyzer is shown in Figure 17.…”

“…Similarly, many geometries were proposed by researchers for the generation of multiband antennas. [6][7][8][9][10][11][12][13][14][15] All these models have less performance like narrow bandwidth, low gain and larger in size.…”

A wideband rectangular and circular ring‐shaped patch antenna with gap coupled meandered parasitic elements for wireless applications

“…Techniques reported to enhance impedance bandwidth are to increase bandwidth by increasing planar area of the patch, by using shorting pins and creating defected ground . Some other techniques such as proximity coupling feed, aperture coupling feed and stack configuration are reported to enhance the bandwidth but these techniques may require multilayer structures thus increasing overall volume and cost of antenna …”

“…One of the standard techniques is to place parasitic patch/patches on the top of substrate and creating an electromagnetic coupling gap with radiating patch. It is used either in coplanar or stack geometries to enhance the impedance bandwidth and gain …”