This paper presents a novel transmissive type L/Ku dual-band dual-polarization (DBDP) shared aperture antenna (SAA) with a large frequency ratio. The L-band antenna employs a balanced-fed hollow dielectric resonator antenna (DRA), which has broadband and low cross-polarization; also, it can be used as a radome to protect the Ku-band array. The Ku-band uses a 4 × 4 dual-polarized microstrip antenna array placed inside the hollow DRA and radiates through it. In order to verify the design, a prototype antenna was manufactured and measured. The measured result shows that the SAA covering the frequency bands of 0.95–1.42 GHz and 13.16–13.84 GHz with the reflection coefficient below −10 dB, the isolation between polarizations is better than 40 dB for L-band and 25 dB for Ku-band, the measured gain is 4.8 dBi for L-band and 16.7 dBi for Ku-band, and the cross-polarization level for L- and Ku-band is lower than −28 and −20 dB, respectively.

中文翻译：

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用作天线罩和天线的介质谐振器：大频率比共享孔径天线设计的新概念

本文提出了一种具有大频率比的新型透射式 L/Ku 双频双极化 (DBDP) 共享孔径天线 (SAA)。L波段天线采用平衡馈电空心介质谐振天线（DRA），具有宽带和低交叉极化；此外，它还可以用作保护 Ku 波段阵列的天线罩。Ku 波段使用一个 4 × 4 双极化微带天线阵列，放置在空心 DRA 内部并通过它进行辐射。为了验证设计，制造并测量了原型天线。实测结果表明，SAA覆盖0.95-1.42 GHz和13.16-13.84 GHz频段，反射系数低于-10 dB，极化间隔离度优于L波段40 dB和Ku波段25 dB ，测得的 L 波段增益为 4.8 dBi，Ku 波段增益为 16.7 dBi，