Miniature Slotted Semi-Circular Dual-Band Antenna for WiMAX and WLAN Applications

Abstract

In this paper, a new approach is presented for designing a miniaturized microstrip patch antenna (MPA) for dual-band applications. The proposed MPA consists of a semi-circular patch radiator fed by a 50-Ω coplanar waveguide (CPW) structure with a tapered-ground plane for enhancing impedance bandwidth over the dual-band. By inserting a folded U-shaped slot into the semi-circular patch, the proposed antenna introduces an additional higher-order mode but does not modify the resonance frequency of the lower-order mode of the patch, yielding the desired dual-band response. For antenna miniaturization, the circular-shaped radiator of the reference antenna (RA) was converted into a semi-circular radiating patch. Agreement between CST and HFSS simulated results led us to manufacture a prototype of the designed antenna on one side of an inexpensive FR-4 substrate with an overall dimension of 17 × 18 × 0.8 mm<sup>3</sup>. The measured result in terms of reflection coefficient S11 confirms that the antenna operates in both 3.5 GHz (3.4–3.7 GHz) and 5.8 GHz (5.725–5.875 GHz) bands suitable for use in WiMAX and WLAN applications, respectively. Moreover, besides an area reduction of 32% compared with the RA counterpart, the proposed antenna has other features, a simple geometry, and is easy to manufacture in comparison with previously reported antenna structures.

Triple Rectangular Notch UWB Antenna Using EBG and SRR

“…None of the reference antennas have a triplerectangular notching characteristics. The antennas presented [8,10,12,13,15,17] have conventional triple notches. The antenna presented in [19,20,25] is offering rectangular notch-bands only the WLAN band.…”

Thiết Kế Ăng-Ten Vô Hướng Mạch Dải Băng Rộng Sử Dụng Trong Các Ứng Dụng Không Dây

“…Đã có nhiều nghiên cứu về việc mở rộng băng thông, nâng cao chất lượng của ăng-ten vô hướng mạch dải ở nhiều dải tần khác nhau (cho các ứng dụng khác nhau) đã được công bố. Các ăng-ten được thiết kế có thể làm việc ở nhiều băng tần như [3]- [6] hoặc với một băng tần siêu rộng như [7]- [11]. Băng thông của ăng-ten vô hướng mạch dải hiện nay đã được mở rộng rất nhiều và thích hợp đồng thời với nhiều ứng dụng hơn.…”

Wideband miniaturized patch radiator for Sub-6 GHz 5G devices

“…An ultra-wideband antenna based on a modified ground plane is presented for being operated in the sub-6 GHz 5G bandwidth of 2.32 GHz-5.24 GHz [11]. Also, many other shapes of the slots embedded in the antenna geometry targeting multiband operation [12], T-shape slots [13], L-shaped slots [14], elliptical/circular slots [15], semi-circular slots [16], C-shaped slots [17], hexagonal slots [18,19] and so forth have been proposed. The modified ground plane of microstrip antennas helps in achieving dual-band [20], wide-bandwidth [21], etc.…”