ABSTRACT This paper proposes a dual-polarized cavity-backed Vivaldi antenna with wide bandwidth for telemetry system. The designed dual-polarized antenna is composed of two orthogonal printed dipole antennas, and each polarized antenna is fed by Non-Coplanar Strip line. A wideband Balance to Un-balance transformer (Balun) is employed to connect the input microstrip transmission line with the antenna Vivaldi radiator. The designed feeding structure makes the two antenna substrates to be directly mounted and the occlusion problem is resolved, and the port isolation is also improved. A cylindrical metal cavity is introduced to enhance the radiation pattern and efficiency. The dual-polarized antenna can be operated in the frequency band of 1.9–2.5 GHz, which covers the band frequencies of the designed telemetry system. The simulated results through the full-wave electromagnetic simulation technique show that the gains of two polarization ports are higher than 6.9 dBi at central frequency. A prototype with dual linear polarization has been fabricated for validation. Both the simulation and measured results show that the proposed antenna has a bandwidth of 27% when the voltage standing wave ratio is less than 2 with desirable directional radiation patterns as well as high isolation better than −25 dB between the two input ports. The antenna scheme proposed in this paper is suitable for the telemetry system application.

中文翻译：

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一种用于遥测系统应用的具有简单馈电结构的双极化腔背维瓦尔第天线

摘要 本文提出了一种用于遥测系统的宽带宽双极化腔背维瓦尔第天线。设计的双极化天线由两个正交的印刷偶极子天线组成，每个极化天线由非共面带状线馈电。宽带平衡到不平衡变压器 (Balun) 用于将输入微带传输线与天线 Vivaldi 辐射器连接起来。设计的馈电结构使两个天线基板直接贴装，解决了遮挡问题，端口隔离度也得到了提高。引入圆柱形金属腔以增强辐射模式和效率。双极化天线可以工作在1.9-2.5 GHz频段，覆盖了设计遥测系统的频段。通过全波电磁仿真技术的仿真结果表明，两个极化端口在中心频率处的增益均高于6.9 dBi。已经制造了具有双线性极化的原型以进行验证。仿真和测量结果均表明，当电压驻波比小于 2 时，所提出的天线具有 27% 的带宽，具有理想的定向辐射模式以及两个输入端口之间优于 -25 dB 的高隔离度。本文提出的天线方案适用于遥测系统应用。仿真和测量结果均表明，当电压驻波比小于 2 时，所提出的天线具有 27% 的带宽，具有理想的定向辐射模式以及两个输入端口之间优于 -25 dB 的高隔离度。本文提出的天线方案适用于遥测系统应用。仿真和测量结果均表明，当电压驻波比小于 2 时，所提出的天线具有 27% 的带宽，具有理想的定向辐射模式以及两个输入端口之间优于 -25 dB 的高隔离度。本文提出的天线方案适用于遥测系统应用。