A 256-Element Ka-Band CMOS Phased-Array Receiver Using Switch-Type Quadrature-Hybrid-First Architecture for Small Satellite Constellations element quadrature hybrid when the switches are turned off in quadrature-hybrid mode. On the other hand, in through mode, the midpoint of the two inductors can be connected to the grounds by turning the switches on. As a result, signals input to the IN H and IN V ports will flow to the OUT L/H and OUT R/V ports respectively after a 45-degree phase shift.

📋 论文概要

该论文提出了一种256单元Ka波段CMOS相控阵接收机，采用开关型正交混合器前置架构，使LNA无需输入匹配网络即可工作在最佳噪声系数点，解决了阵列天线波束赋形引起的阻抗变化导致的噪声系数恶化问题。

💡 主要创新点

• 在LNA前放置开关型正交混合器，实现LNA在无输入匹配网络下工作于最佳噪声系数点。
• 通过开关型正交混合器架构，有效抑制阵列天线阻抗变化对接收机噪声系数的负面影响。

🏷 关键词

📄 原文摘要

Yudai Yamazaki1, Xiaolin Wang1, Xi Fu1, Dongwon You1, Makoto Higaki2, Jumpei Sudo2, Hiroshi Takizawa2, Masashi Shirakura2, Takashi Tomura1, Hiroyuki Sakai1, Kazuaki Kunihiro1, Kenichi Okada1, Atsushi Shirane1 By placing the switch-type quadrature hybrid in front of the LNA, the LNA can operate at the optimal point for NF without an input matching network. In conventional receivers, the antenna and the LNA are directly connected, and impedance and noise matching must be performed simultaneously. Array antennas cause NF degradation in the receiver because of impedance changes caused by beamforming [7]. In other words, beam control can degrade the NF of the LNA. By inserting a quadrature hybrid between the antenna and the LNA, S11 can be kept low while absorbing the impedance changes of the antennas. However, the insertion loss of the quadrature hybrid adds to the total NF. By optimizing the

👥 作者与机构

Sena Kato1, Jill Mayeda1, Keito Yuasa1, Michihiro Ide1, Takeshi Ota1, Shu Date1,