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Abstract：
In this article, a dual-mode, dual-polarized antenna designed using characteristic mode analysis (CMA) is described. An elliptical-shaped patch radiator is chosen with double slits on its minor axis. This design is based on mode separation from the circular patch into the elliptical patch. The suggested antenna geometry has a footprint of 60 mm × 60 mm × 1.6 mm. To design and fabricate the antenna, an FR-4 substrate with a relative permittivity of 4.3 is used, along with copper sheets 0.035 mm thick for the ground plane and the radiating plane. The circular patch has the resonating mode at 1.8 GHz, whereas the elliptical radiator gives different resonant modes at 1.8 GHz and 3.5 GHz. An orthogonal mode is excited with a 50-Ω coaxial feed line at 3.5 GHz by applying a full-wave approach. The antenna gives a -10dB bandwidth of 51 MHz (1.77-1.82 GHz) centered at 1.8 GHz and a bandwidth of 210 MHz (3.37-3.58 GHz) centered at 3.5 GHz. The working principle is explained through modal analysis and characteristic angles. This dual-band antenna covers a 1.8 GHz GSM band with horizontal polarization and a 3.5 GHz 5G service with vertical polarization. Peak gain attained with these bands is 5.9 dBi and 7.1 dBi, respectively. A CST full-wave simulator is used for the simulations. As a result of the antenna, radiation is stable and enhanced. Compared to measured results, simulation results are close to reality. The characteristic mode analysis (CMA) provides an in-depth look into different operating modes on the antenna in contrast with the conventional method, which relies on the simulated current distribution to verify functionality.
摘要：
在这篇文章中,双模式，描述了使用特征模态分析（CMA）设计的双极化天线。椭圆形的贴片辐射器被选择为在其短轴上具有双狭缝。该设计基于从圆形贴片到椭圆形贴片的模式分离。建议的天线几何形状具有60mmX60mmX1.6mm的覆盖区。为了设计和制造天线，使用相对介电常数为4.3的FR-4衬底，以及用于接地平面和辐射平面的0.035mm厚的铜片。圆形贴片在1.8GHz具有谐振模式，而椭圆形辐射器在1.8GHz和3.5GHz时给出不同的谐振模式。通过应用全波方法，在3.5GHz下用50Ω的同轴馈线激发正交模式。天线给出以1.8GHz为中心的51MHz(1.77-1.82GHz)的-10dB带宽和以3.5GHz为中心的210MHz(3.37-3.58GHz)带宽。通过模态分析和特征角度说明了其工作原理。此双频段天线覆盖了具有水平极化的1.8GHzGSM频段和具有垂直极化的3.5GHz5G服务。这些频段获得的峰值增益为5.9dBi和7.1dBi，分别。CST全波模拟器用于模拟。作为天线的结果，辐射是稳定和增强的。与实测结果相比，仿真结果接近实际。与传统方法相比，特征模式分析（CMA）提供了对天线上不同操作模式的深入研究，这依赖于模拟电流分布来验证功能。
