A circularly polarized printed elliptical wide-slot antenna with high bandwidth-dimension-ratio for wireless application
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A circularly polarized printed elliptical wide-slot antenna with high bandwidth-dimension-ratio for wireless applications Munish Kumar1
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Vandana Nath1
Ó Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This paper outlines a simple design of a compact wideband microstrip-line fed antenna having two rotated elliptical wideslots (EWSs). Here, both the elliptical wide-slots are placed perpendicular to each other which shows the measured 10 dB return loss bandwidth (RLBW) of about 7.78 GHz (4.94–12.72 GHz; 88.11%). The circular polarization (CP) is achieved by varying either the semi-major axis of any of the elliptical wide-slot or angle between the EWSs. The proposed antenna radiates left-handed circularly polarized (LHCP) and shows the measured axial ratio bandwidth (ARBW) of about 2.05 GHz (5.4–7.45 GHz; 31.91%) which falls completely inside the operating frequency band and hence relevant for wireless applications including an upper-frequency band of WLAN, WiMAX and several standards of IEEE 802.11 including a/h/j/n/ac/ax. The proposed antenna also achieves a high bandwidth dimension ratio (BDR) of about 1062 which along with the ARBW is the highest among the recently reported antenna structures. A peak gain of about 4.39 dBi is reported within the entire operating band while the overall size of the antenna is only 18 17 mm2 (or 0:29ko 0:28ko ; where ko is the wavelength corresponding to the lowest operating frequency, i.e., 4.94 GHz). The performance of the proposed antenna in terms of RLBW, ARBW, gain, and efficiency are validated experimentally which are in concordance with the simulated results. Keywords Elliptical wide-slot antenna Microstrip-line Circular polarization (CP) Wireless local Area network (WLAN) Bandwidth dimension ratio (BDR)
1 Introduction Recently, the antenna researchers are aiming to design simple and compact antenna that can support multiple frequency bands. In wireless applications such as wireless local area networks (WLANs), worldwide interoperability of microwave access (WiMAX), radio frequency identification (RFIDs), satellite and radar communications, the transmitter and receiver antennas are not always present in line-of-sight. Due to the misalignment of both antennas and having multipath interference, the need of circularly & Munish Kumar [email protected] Vandana Nath [email protected] 1
University School of Information Communication and Technology (USIC&T), GGS Indraprastha University (GGSIPU), New Delhi, India
polarized (CP) antennas came into existence and become an essential requirement for these wireless applications [1]. Antennas with CP characteristics show distinct advantages such as enhanced mobility, immunity to multipath distortion, misalignment of transmitter and receiver antennas, less prone to weather penetration and other propagation effects over their linearly polarized counterparts [2]. It is possible to generate CP in conventional microstrip patch antennas by excit
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