A coaxial‐fed tri‐band zeroth‐order resonance (ZOR) circularly polarized antenna with higher gains for all the excited ZORs is designed and analyzed in this paper. Epsilon negative transmission line (ENG TL) and pseudo‐open termination (P‐OT) unit cells with different series capacitances (C_S and C_S1) resonate shunt ZOR (f_sh) and two series ZORs (f_se and f_se1), respectively. Asymmetric unit cell concept is applied to ENG‐TL and P‐OT unit cells to create vertical and horizontal components, and the 90° phase shift is provided by the ZOR, resulting in circular polarization (CP). Left‐hand CP (LHCP) is achieved by creating two 90° right bends to the extended stubs in ENG TL and P‐OT unit cells. Higher gains for all the excited ZORs are achieved by shifting the shorting pins of ENG TL and P‐OT unit cells far away from the center position. After fabrication, the measured resonances occur at 4.64 GHz (f_sh), 4.04 GHz (f_se), and 3.86 GHz (f_se1) with fractional bandwidths of 1.62%, 1.73%, and 1.6%, respectively. The measured LHCP peak gains are 4.05 dBic (f_sh), 3.85 dBic (f_se), and 3.94 dBic (f_se1). The average axial ratio obtained is less than 3‐dB in the 10‐dB fractional bandwidth of the proposed antenna.

中文翻译：

---

使用伪开路终端和非对称晶胞的同轴馈电高增益三频零阶圆极化天线

本文设计并分析了所有馈电ZOR具有更高增益的同轴馈电三频零阶谐振（ZOR）圆极化天线。负的ε-传输线（ENG TL）和伪终端开路（P-OT）单元电池具有不同的串联电容（ç_小号和Ç _S1）共振分流ZOR（˚F _SH）和两个系列ZORs（˚F _SE和˚F _SE1）， 分别。非对称晶胞概念应用于ENG-TL和P-OT晶胞，以创建垂直和水平分量，并且ZOR提供90°相移，从而导致圆极化（CP）。左CP（LHCP）是通过在ENG TL和P‐OT单位单元中的延伸桩上创建两个90°右弯来实现的。通过将ENG TL和P‐OT单元电池的短路引脚移离中心位置，可以获得所有激发ZOR的更高增益。在制造之后，测得的谐振发生在4.64 GHz（f _sh），4.04 GHz（f _se）和3.86 GHz（f _se1）处，其分带宽分别为1.62％，1.73％和1.6％。测得的LHCP峰值增益为4.05 dBic（f _sh），3.85 dBic（f _se）和3.94 dBic（f _se1）。在拟议天线的10dB分频带宽中，获得的平均轴向比率小于3dB。