Broadband circularly polarized printed falcate‐shaped monopole antenna

Abstract

In this study, a simple broadband circularly polarized (CP) printed monopole antenna for S/C-band applications is proposed. The CP antenna is composed of a falcate-shaped monopole with a right-angle trapezoid stub, then wide impedance and axial ratio (AR) bandwidths are achieved. By placing one rectangular split-ring resonator above the stub for generating upper CP mode, both of impedance and CP performances are further improved. The proposed antenna is fabricated on a FR4 substrate and measured. The measured −10-dB impedance bandwidth is 107%, ranging from 2.4-7.9 GHz, and the measured 3-dB AR bandwidth is 94% (2.4-6.6 GHz), covering the entire wireless local area network (WLAN) and WiMAX bands.

Design of Wideband Circular-Slot Antenna for Harvesting RF Energy

“…As such, a vertical rectangular slot is raised from the center of the radiator to enhance the impedance matching across the wide f o . Rectangular stubs have been frequently employed in various literature to increase the resonance performance depending on their orientation [43][44][45][46]. Varying the length of the slot t has an impact on the impedance BW, which distorts the antenna peak achievable gain.…”

A wide circularly polarized dual‐band isosceles trapezoidal monopole antenna with modified ground plane

“…But single‐feed CP antenna has a constraint of narrow 3‐dB axial ratio BW. Various single‐fed monopole CP antennas with different configuration have been designed in the recent few years 8–14 …”

“…Various single-fed monopole CP antennas with different configuration have been designed in the recent few years. [8][9][10][11][12][13][14] In this paper, an isosceles trapezoidal monopole antenna (ITMA) with dual broadband characteristics of impedance bandwidth (IBW) and a single wideband axial ratio bandwidth (AR BW) is proposed. The antenna is designed on a single layer, single microstrip line feed configuration, and low-cost substrate (FR4).…”