Broadband Dual Circularly Polarized Magnetoelectric Dipole Antenna Fed by a Miniaturized Six-Branch Hybrid Coupler

Abstract

A broadband dual circularly polarized magnetoelectric dipole antenna (MEDA) fed by a miniaturized six-branch hybrid coupler (SBHC) is presented in this paper. First, a dual linearly polarized MEDA with a bandwidth of 73.3% is developed based on the previous design with a bandwidth of 52%. The SBHC, with a miniaturized size of 53%, is designed on a printed circuit board underneath the ground of the MEDA, which possesses an efficient bandwidth of 80.7% to generate the antenna for dual circular polarization. Measurement results show that the proposed dual circularly polarized MEDA achieves an impedance bandwidth of 84.5%, an axial-ratio bandwidth of 81.8%, and a nearly symmetrical, stable unidirectional radiation pattern with an average gain of 8 dBic over its impedance bandwidth.

Dual-Sense Circular Polarization Antenna Based on Reconfigurable Orthogonal Network

“…Circularly polarized radiation can be realized by exciting two orthogonal modes with equal amplitude and 90°phase difference. In the current research, the feeding method of the circularly polarized antenna can be mainly divided into single-feed technique [2][3][4] and multifeed technique [5][6][7][8].…”

“…Ring-slot structure with stubs can be fed with single feeding line to excite CP polarization [2]. e two orthogonal modes can also be excited by symmetrical ring patch and a slot with L-shaped coupling strip [5,6] or dual coupling branches [7,8]. Generally, multifeed form needs to be realized by the corresponding orthogonal feeding network design [9].…”

Design and Analysis of Comb Shape Microstrip Patch Array Antenna for Wlan Applications

“…In adhoc mode, mobile units transmit directly peer-to-peer. In infrastructure mode, mobile units communicate through an access point that serves as a bridge to other networks In the literature, there are multitudinous techniques is employed to design the microstrip patch array antenna for WLAN applications, such as, Yagi array antenna [12], log-periodic array antenna [13], dipole array antenna [14], high gain double-sided array antenna [15] and multiband array antenna for WLAN/WiMAX [16]. From this reported work, it is scrutinized that the performance of the antennas is poor.…”