In this article, a novel design of compact cavity‐backed slot antenna based on substrate integrated waveguide (SIW) technology is presented for dual‐frequency communication services. A single layer printed circuit board is applied to implement the proposed antenna. The bowtie‐ring slot engraved on the SIW square cavity is excited using two orthogonal microstrip feed lines to operate at two distinct frequencies (6.62 GHz and 11.18 GHz). The proposed antenna allows each of these frequencies to be designed independently. A prototype of the proposed cavity‐backed antenna that radiates at both 6.62 GHz and 11.18 GHz is fabricated and measured. The port isolation better than 29.3 dB is achieved by utilizing the transmission zeros (TZs), which are produced due to the orthogonal feed lines, TE₁₁₀ mode and coupling between the TE₁₂₀ and TE₂₁₀ modes. The measured peak gains of the proposed diplexing antenna are 5.77 dBi and 5.81 dBi at lower and upper resonating frequencies, respectively. The proposed dual‐frequency antenna exhibits the front‐to‐back‐ratio (FTBR) and cross‐polarization level greater than 26 dB and 21 dB, respectively, at both resonating frequencies.

中文翻译：

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基于基片集成波导的紧凑型正交正交自馈双领结缝隙天线设计

在本文中，提出了一种基于衬底集成波导（SIW）技术的紧凑型腔背隙缝隙天线的新颖设计，可用于双频通信服务。应用单层印刷电路板来实现所提出的天线。使用两条正交的微带馈线，在两个不同的频率（6.62 GHz和11.18 GHz）下工作，可以激励刻在SIW方腔上的蝶形领槽。所提出的天线允许独立设计这些频率中的每一个。拟议并测量了拟议的背腔天线的原型，该天线在6.62 GHz和11.18 GHz均可辐射。通过利用正交馈线TE ₁₁₀产生的传输零点（TZ），可实现优于29.3 dB的端口隔离模式以及TE ₁₂₀和TE ₂₁₀模式之间的耦合。所建议的双工天线在较低和较高谐振频率下测得的峰值增益分别为5.77 dBi和5.81 dBi。拟议中的双频天线在两个谐振频率下的前后比（FTBR）和交叉极化电平分别大于26 dB和21 dB。