In this letter, a broadband rectifier with a wide-incident-angle (WIA) property is proposed. The circuit is composed of a broadband quadrature coupler (BQC) and two broadband subrectifiers (RectA and RectB). Here, RectA and RectB are connected to the two output ports of the BQC and combined by a direct current (dc) power combiner. Then, the obtained dc power is transmitted to the load resistor. Besides, two RF sources (RF1 and RF2) with identical input power and a phase difference ( $\Delta \varphi$ ) are connected to the input and isolated ports of the BQC. A detailed theoretical analysis is carried out. To validate the proposed scheme, we design a broadband (1.6–2.8 GHz) WIA rectifier. Measurement results show that the power conversion efficiency (PCE) exceeded 60% in the frequency range from 1.6 to 2.8 GHz at 13.1 dBm of the input power. Additionally, at 2.45 GHz, the PCE varies in the range of 60.8% and 72.6% within the entire $\Delta \varphi $ range (0°–360°). Thus, the obtained PCE variation ( $\Delta \eta$ ) is 11.8%. Considering its excellent broadband and WIA features, it is very suitable for high-efficiency radio-frequency (RF) energy harvesting (RFEH) systems.

中文翻译：

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用于射频能量收集的基于正交耦合器的宽入射角入射波宽带整流器

在这封信中，提出了一种具有宽入射角 (WIA) 特性的宽带整流器。该电路由一个宽带正交耦合器 (BQC) 和两个宽带子整流器（RectA 和 RectB）组成。这里，RectA 和 RectB 连接到 BQC 的两个输出端口，并由直流 (dc) 功率组合器组合。然后，将获得的直流电传输到负载电阻。此外，两个射频源（RF1 和 RF2）具有相同的输入功率和相位差（ $\Delta\varphi$ ) 连接到 BQC 的输入和隔离端口。进行了详细的理论分析。为了验证所提出的方案，我们设计了一个宽带 (1.6–2.8 GHz) WIA 整流器。测量结果表明，在输入功率为 13.1 dBm 时，功率转换效率 (PCE) 在 1.6 至 2.8 GHz 的频率范围内超过 60%。此外，在 2.45 GHz 时，PCE 在整个范围内的变化范围为 60.8% 和 72.6% $\三角洲\varphi $范围 (0°–360°)。因此，获得的PCE变化（ $\Delta\eta$ ) 为 11.8%。考虑到其出色的宽带和 WIA 特性，非常适用于高效射频 (RF) 能量收集 (RFEH) 系统。