Miniaturised multiple notched omnidirectional UWB monopole antenna

Abstract

A miniaturised coplanar waveguide-fed multiple notched monopole antenna for ultra-wide bandwidth (UWB) application is presented. By introducing multiple inverted L-shaped stubs embedded within a polygonal shaped monopole antenna, multiple notches can be achieved. A prototype antenna with triple band-notched at WiMAX, WLAN, and X-band is designed and fabricated. The proposed antenna has an impedance bandwidth of 3-12 GHz with a voltage standing wave ratio of <2 except for the selected notched bands. The main advantage of the antenna is its miniaturised size (21 × 14 mm 2), as well as the straightforward design. The antenna has a unipolar configuration and good omnidirectional radiation pattern with negligible distortion which is suitable for UWB applications.

Stub loaded, low profile UWB antenna with independently controllable notch‐bands

“…Table presents a comparison of the proposed work with state‐of‐the‐art antenna for the band notch applications. It can be clearly seen that the presented antenna shows an overall compact size as compared to the presented antennas except the work referenced in paper which exceeds in term of compactness. However, our proposed antenna overcomes it by the notch control functionality which is not available in the related paper.…”

“…Due to the presence of these bands inside UWB region, interference occurs between UWB systems and other sub‐bands. To solve this problem, academia has proposed a solution in the form of UWB antennas with notch bands . Unwanted band spectrums were firstly notched from the UWB antenna using band stop filters, but they also introduce the drawback of complex circuitry and mismatching of load .…”

“…Unwanted band spectrums were firstly notched from the UWB antenna using band stop filters, but they also introduce the drawback of complex circuitry and mismatching of load . To overcome these problems, researchers have adopted various techniques including slotted patches, stubs metamaterials and defected ground structures (DGS) to mitigate desired bands from UWB region. In Reference , a compact size UWB antenna is presented, where the bandwidth of a conventional rectangular patch is enhanced by truncating its lower edges.…”

“…In Reference , fractal slots were adopted to notch the bands from UWB region, however only specific bands can be mitigating as these slots cannot be controllable. In References , stubs were employed to upend the problem of signal interference. Besides the advantage of compact size these antennas can notch up to three bands, but due to the limitation of specific band notching these antennas lose their worth and cannot be used for modern devices where controllable notch band antennas are required.…”

“…To solve this problem, academia has proposed a solution in the form of UWB antennas with notch bands. 6,[9][10][11][12][13][14][15][16][17][18] Unwanted band spectrums were firstly notched from the UWB antenna using band stop filters, 9 but they also introduce the drawback of complex circuitry and mismatching of load. 10 To overcome these problems, researchers have adopted various techniques including slotted patches, [11][12][13][14]19 stubs 15,16 metamaterials 17,18 and defected ground structures (DGS) 12 to mitigate desired bands from UWB region.…”