Abstract
A novel wideband circularly polarized antenna array using sequential rotation feeding network is presented in this paper. The proposed antenna array has a relative bandwidth of 38.7% at frequencies from 5.05 GHz to 7.45 GHz with a highest gain of 12 dBi at 6 GHz. A corresponding left-handed metamaterial is designed in order to increase antenna gain without significantly affecting its polarization characteristics. The wideband circularly polarized antenna with 2.4 GHz of bandwidth is a promising solution for wireless communication system such as tracking or wireless energy harvesting from Wi-Fi signal based on IEEE 802.11ac standard or future 5G cellular. A potential application of this antenna as a receiving antenna for RF-DC device to obtain DC power for a wireless sensor node from Wi-Fi signal is shown.
Highlights
In the recent years, wireless sensor network (WSN) has attracted the attention in wireless communication domain for monitoring, medical observation, military surveillance, localization, smart home, smart building, and smart city [1]
The array of 2 × 2 patch elements based on sequential rotation technique that generates an excellent circularly polarized (CP) over a relatively wide frequency bandwidth is designed as the reference antenna
The proposed feeding network using Wilkinson power divider [27] excites equal amplitude and phase arranged in 0°, 90°, 180°, and 270° to four patch elements in order to obtain a good axial ratio (AR) over the frequency from 5.52 GHz to
Summary
Wireless sensor network (WSN) has attracted the attention in wireless communication domain for monitoring, medical observation, military surveillance, localization, smart home, smart building, and smart city [1]. In [11], an Eshaped slot is investigated along the orthogonal axis of the circular patch to generate CP performance and to improve antenna gain. This antenna has wide-angle CP radiation of 140o with a bandwidth of 3.2% and a gain of more than 5.0 dBic at 2.38 GHz. Four stubs are integrated at four corn of a square patch antenna to have CP performance in [12]. A novel wideband CP patch antenna using a wideband left-handed metamaterial (WBLHM) substrate to improve the antenna gain is proposed. Both simulated and measured verifications are investigated to highlight its performance.
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