This article presents a 148-GHz coupled loop fundamental oscillator with a quad-feed octagonal slot antenna. The proposed loop configuration with a multi-feed antenna leads to each oscillator experiencing multiple injected signals. An analysis is performed to explain the dynamics of the coupled loop oscillator in the presence of multiple signal-injection paths. It is shown that the proposed oscillator configuration will only operate with $- \pi /2$ phase between the adjacent oscillators. This phase difference is necessary for the quad-feed antenna to combine and radiate the output power from the four single-ended oscillators in the loop. The output from each oscillator is ac coupled to the following oscillator stage using a phase compensating capacitor, whose value is selected to enhance the oscillation frequency of the coupled loop. The use of buffer stages is avoided in favor of a passive power feed network for extraction of the output power from each oscillator. The proposed oscillator is fabricated in a 22-nm FDSOI process and has a 0.5-mm ² chip area. The measured peak effective isotropic radiated power (EIRP) of the oscillator is 9.7 dBm with a corresponding dc-EIRP efficiency of 34.3% when operating from a 0.8-V supply. To the authors’ knowledge, this dc-EIRP efficiency is the highest among reported oscillators to date operating between 100 and 200 GHz.

中文翻译：

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使用耦合环路振荡器和22nm FD-SOI中的四馈天线的148 GHz散热器

本文介绍了一种具有四馈入八角形缝隙天线的148 GHz耦合环路基本振荡器。所提出的具有多馈天线的环路配置导致每个振荡器经历多个注入信号。进行分析以说明存在多个信号注入路径时耦合环路振荡器的动态。结果表明，建议的振荡器配置只能在以下条件下运行： $-\ pi / 2 $ 相邻振荡器之间的相位。该相位差对于四馈天线来说是必要的，以便组合并辐射环路中四个单端振荡器的输出功率。使用相位补偿电容器将每个振荡器的输出交流耦合到随后的振荡器级，选择该电容器的值以增强耦合环路的振荡频率。避免使用缓冲级，而采用无源馈电网络从每个振荡器提取输出功率。拟议的振荡器采用22纳米FDSOI工艺制造，并具有0.5毫米 ²芯片面积。当使用0.8V电源供电时，振荡器的测得峰值有效各向同性辐射功率（EIRP）为9.7 dBm，相应的dc-EIRP效率为34.3％。据作者所知，这种dc-EIRP效率是迄今为止在100至200 GHz之间工作的已报道振荡器中最高的。