The design of a compact substrate integrated waveguide (SIW) cavity-backed circular-polarized antenna using a slow wave structure is proposed in PCB technology. Based on a multilayer substrate, this topology includes internal metallized blind via holes connected to the bottom conductive plane, inducing the physical separation of electric and magnetic fields in the SIW cavity. Hence, a slow wave effect is obtained, allowing a 47% reduction of the antenna cavity in comparison with its classic SIW antenna counterpart. Moreover, by asymmetrically inserting an inductive via into the patch region, a degenerated mode allows both a circular polarization and an enlargement of impedance bandwidth. Measurements and simulations are in good agreement in terms of radiation pattern and circular polarization with a return loss of 15 dB and a gain of 4.8 dBic.

中文翻译：

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基于慢波基片集成波导的圆极化方槽天线

在PCB技术中，提出了一种采用慢波结构的紧凑型衬底集成波导（SIW）腔背圆极化天线的设计。基于多层基板，此拓扑包括连接到底部导电平面的内部金属化盲孔，从而在SIW腔中引起电场和磁场的物理隔离。因此，获得了慢波效应，与传统的SIW天线相比，天线腔减小了47％。此外，通过将电感性通孔非对称地插入到贴片区域中，退化模式既可以实现圆极化又可以增大阻抗带宽。在辐射方向图和圆极化方面，测量和模拟具有很好的一致性，回波损耗为15 dB，增益为4.8 dBic。