This contribution deals with a frontend for interleaved receive (Rx)-/transmit (Tx)-integrated phased arrays at K-/Ka-band. The circuit is realized in printed circuit board technology and feeds dual-band Rx/Tx- and single-band Tx-antenna elements. The dual-band element feed is composed of a substrate-integrated waveguide (SIW) diplexer with low insertion loss, a low-noise amplifier (LNA), a bandpass filter, and several passive transitions. The compression properties of the LNA are identified through two-tone measurements. The results dictate the maximum allowable output power of the power amplifier. The single band feed consists of a SIW with several transitions. Simulation and measurement results of the individual components are presented. The frontend is assembled and measured. It exhibits an Rx noise figure of 2 dB, a Tx insertion loss of ~ 2.9 dB, and an Rx/Tx-isolation of 70 dB. The setup represents the unit cell of a full array and thus complies with the required half-wave spacing at both Rx and Tx.

中文翻译：

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用于 K-/Ka-Band 交错 Rx/Tx 阵列的紧凑型低噪声前端

该贡献涉及交错接收 (Rx)-/发射 (Tx)-集成的 K-/Ka 波段相控阵的前端。该电路采用印刷电路板技术实现，并为双频 Rx/Tx 和单频 Tx 天线元件供电。双频带元件馈电由具有低插入损耗的衬底集成波导 (SIW) 双工器、低噪声放大器 (LNA)、带通滤波器和几个无源转换组成。LNA 的压缩特性通过双音测量来识别。结果决定了功率放大器的最大允许输出功率。单波段馈电由具有多个跃迁的 SIW 组成。给出了各个组件的仿真和测量结果。前端是组装和测量的。它的 Rx 噪声系数为 2 dB，Tx 插入损耗约为 2。9 dB，以及 70 dB 的 Rx/Tx 隔离。该设置表示完整阵列的单位单元，因此符合 Rx 和 Tx 所需的半波间距。