Design and analysis of miniaturized UWB antenna with tunable notched band

Abstract

We report in this paper a novel miniaturized (12 × 18 × 1.6 mm3) microstrip fed UWB antenna with tunable notched band characteristics. The proposed antenna covers the tunable notched band for IEEE 802.11a wireless local area network operating in the frequency band of 5.15–5.825 GHz. The design of proposed antenna includes annular ring radiating patch with two T-shaped strips present inside it. The band notching is obtained by adjusting coupling between T-shaped strips placed inside the annular ring. In order to achieve larger bandwidth the ground plane of the microstrip antenna is modified. The simulated return loss of the proposed antenna has been verified in fabricated antenna experimentally, which has been in good agreement.

Coplanar Waveguide-fed UWB Slotted Antenna with Notched-band Performance

“…At a higher frequency, the radiation patterns still retain excellent omnidirectional curves on the H-plane, whereas, a low distortion can be observed for the E plane at 10 GHz. It can be observed that the realized gain of the proposed slotted UWB antenna drop dramatically at the band-notched frequency and have reasonable values away from outwards that are better than the ones achieved in [13][14][15][16]. Furthermore, except at the notched-band a good radiation efficiency is achieved; that is almost over 90 % on the whole working bandwidth of the proposed antenna as depicted in the Fig.…”

Investigations on a circular UWB antenna with Archimedean spiral slot for WLAN/Wi-MAX and satellite X-band filtering feature

“…In the contrary, antennas incorporated with additional filter circuitry design are more complex and expensive. The most cost-effective way is by embedding slots in patch and ground plane [7][8][9][10] or by adding parasitic strips [11]. Lui et al [12] used parasitic open-circuit stub to achieve frequency notch feature.…”

Design of reconfigurable monopole antenna with switchable dual band-notches for UWB applications

“…In [6], the impedance bandwidth has been successfully increased by cutting an inverted T-shaped slot on the radiating patch and adding an inverted T-shaped conductor to the ground plane. Furthermore, UWB antennas with one [7–11] or more band-notches [12–20] are proposed to avoid unexpected interferences with other existing wireless communication systems such as the WLAN operating in 5.15–5.35 and 5.725–5.825, and the WiMAX in 3.3–3.7. Changing the current flow on the radiating patch of the antenna with a narrow slot is one of the easy and commonly used technique to reject a fixed frequency band [7, 10].…”

“…In [11], a UWB antenna with the tunable notched band is designed. The bandwidth of the notched band can be tuned by changing the air-gap distance between two T-shaped strips placed inside the radiating annular patch.…”

“…The bandwidth of the notched band can be tuned by changing the air-gap distance between two T-shaped strips placed inside the radiating annular patch. Inspired by the document [11], a compact reconfigurable UWB antenna design is proposed with dual switchable band-notches covering the 4.9–6.3 GHz band and the 3–3.8 GHz band to overcome the problem of unwanted interference from existing WLAN and WiMAX environment. The proposed antenna has advantages in frequency selection for different interference environment.…”