Design and fabrication of ultra wide-band antenna with band notching property using t-shaped defected ground structure

Abstract

In this paper, a rectangular inset feed microstrip antenna with defected ground plane for UWB application is presented. It is found that by making symmetrical T-shape slots just beneath the radiating patch in the ground plane results UWB characteristics. Parasitic effect is minimized by optimization in the shape of slot like width and length, so that uniform return loss is obtained in the entire UWB range. The simulated and fabricated antenna design shows return loss below -12 dB and voltage standing wave ratio below 2 in the entire UWB range. A very wide impedance bandwidth of 11.2 GHz at -10dB return loss has been obtained.Further, band notching property to avoid the signal interference from existing WiMax system in the environment has been obtained by varying ground structure. The effect of first T-cut slot in ground structure has been observed to result band notching from 3.28 to 4.58 GHz. Therefore, the proposed antenna overcomes the signal interference problem with existing WiMax IEEE 802.16 system and can be suitably used for UWB application.

Design and Analysis of Wideband Stair Step-Shaped Rectangular Ring Microstrip Antenna with DGS for IoT Applications

“…These antennas are suitable for wireless applications because of the variety of patch and feed structures. A significant amount of research has been conducted on wideband and ultra-wideband antenna in which different patch shapes usually involve circular [16], U shape [17], inverted T shape [18], M shape [19], A shape [20], rhombus shape [21], and many others. Along with these various shapes, scientists are also working on a variety of strategies and structures for acquiring wide bandwidth, such as the CPW-fed technique and defective ground structures [22][23][24][25][26].…”

Penta‐band notched ultra‐wideband monopole antenna loaded with electromagnetic bandgap‐structures and modified U‐shaped slots

“…Literature reported in Ref. used various slotting techniques over radiator and/or in ground plane to filter out the interfering frequencies. In addition, the band notched behavior is also realized by embedding parasitic stubs and stub type elements near the radiator .…”

“…Yadav et al used inverted U‐shaped slots on the radiator and iron‐shaped parasitic resonators in the ground plane of circular monopole UWB antenna for producing dual‐band rejection characteristics. However, these referenced designs have some constraints like limited number of notches produced, poor notch‐width controlling capabilities, large size, design complexity, and so forth. Also, the radiation pattern gets affected due to irregularities on radiating surface and/or in ground plane.…”

“…Thus, the different structures proposed in Refs. produce only up to triple notched band characteristics in expense of large physical size and system complexity.…”