Compact Circularly Polarized Monopole Antenna Using Characteristic Mode Analysis

Abstract

This study aims to design a circularly polarized compact antenna using characteristic mode analysis (CMA). The proposed antenna consists of a substrate with a slotted annular ring-shaped patch and partial ground. The excitation position of the antenna and its optimal dimensions are determined through the analysis of different operation modes with CMA. After that, an optimized antenna is designed, and an antenna prototype is fabricated for validation. The experimental results show that the reflection coefficient achieves a -10dB impedance bandwidth of 6.85 GHz, a 3dB-axial ratio bandwidth of 0.7 GHz, and a peak gain of 3.2 dBi. These characteristics agree with simulations and make the circularly polarized compact antenna suit for C-band and sub-6 GHz 5G wireless applications.

Design of a miniaturized dual circularly polarized implantable antenna by using characteristic mode method

“… Ref Volume in λ 0 (mm 3 ) Freq. (GHz) BW (MHz) Gain (dBi) CP 17 π × 0.024 2 × 0.0059 1.4 298.2 − 32 Yes 2.45 521 − 31.6 No 18 0.029 × 0.029 × 0.0029 0.86 134 − 31.8 Yes 1.85 138 − 21.8 2.45 458 − 18.5 24 0.081 × 0.084 × 0.0073 2.45 710 − 24.7 Yes 27 1.429 × 1.429 × 0.0114 8.6 5630 5.6 Yes 28 0.43 × 0.43 × 0.0115 2.17 60 − 23 Yes 2.38 10 3.48 60 29 0.48 × 0.67 × 0.018 6.6 6900 3.2 Yes Prop …”

“…A compact CP implantable antenna for wireless health monitoring microsystems has been proposed in the literature 25 , in which the CP characteristics are obtained by cutting four L-shaped slots in the radiating patch. In addition, a method for designing circularly polarized antennas using eigenmode analysis is also proposed 26 – 29 . The advantage of this method is that it can deeply understand the electromagnetic behavior and carry out optimized design, but its disadvantage is that it is highly complex and requires reliance on computing resources and special tools.…”