Circularly Polarized Antenna Array Fed by Air-Bridge Free CPW-Slotline Network

Abstract

A novel design of 1×2 and 2×2 circularly polarized (CP) microstrip patch antenna arrays is presented in this paper. The two CP antenna arrays are fed by sequentially rotated coplanar waveguide (CPW) to slotline networks and are processed on 1 mm thick single-layer FR4 substrates. Both of the two arrays are low-profile and lightweight. An air-bridge free CPW-slotline power splitter is appropriately designed to form the feeding networks and realize the two CP antenna arrays. The mechanism of circular polarization in this design is explained. The simulated and measured impedance bandwidths as well as the 3 dB axial ratio bandwidths and the radiation patterns of the two proposed antenna arrays are presented. This proposed design can be easily extended to form a larger plane array with good performance owing to its simple structure.

Recent Trends in Compact Planar Antennas at 5G Sub-6 GHz and mmWave Frequency Bands for Automotive Wireless Applications: A Review

“…In [43], an aperture coupled antenna array is presented with the utilization of multilayer substrates, and the design is optimized to operate in the Ka-band. In [44], an aperture coupled 2×2 patch antenna array is proposed with the use of a sequentially rotated CPW feeding network, and the proposed design is analyzed based on resonance, axial ratio and radiation patterns. Further, in [45] a sequentially fed CP antenna array has been projected for wideband modern wireless applications.…”

A wideband dielectric resonator antenna array using air‐bridgeless coplanar waveguide power divider

“…Where λ g is the guided wavelength in the transmission line and inter‐element spacing (S) and length (p) are shown in Figure . For the proposed array, a phase difference (Φ i − Φ j ) of 180 0 between the radiators DR1 & DR2 as well as between the radiators DR3 and DR4 has been introduced for in‐phase radiation . For the operating frequency f 0 = 6.5 GHz, the initial values become S‐2p = 17.23 mm to achieve 180 0 phase difference.…”

“…The Air‐bridge less CPW power divider firstly proposed in ref. is recently used to design a circularly polarized microstrip patch antenna array in by Liu et al…”