基于半波长传输线的双频整流电路设计

Design of dual-band rectifier circuit using a half-wavelength transmission line

摘要:

提出一种低剖面、紧凑的双频整流电路，可用于射频能量收集和微波功率传输等场景中。提出的整流电路没有使用阻抗匹配网络，仅使用2条微带传输线实现整流电路的双频特性：第1条微带传输线将肖特基二极管(HSMS-2850)与整流电路后端的负载和滤波器进行连接；第2条微带传输线为半波长微带传输线，为设计的整流电路增加了第2个频段。这种设计方式不仅减小了整流电路的整体尺寸(0.14λ₀×0.11λ₀，λ₀为最低频率对应的波长)，也减少了额外匹配结构带来的损耗。经过理论分析、仿真和加工制造，整流电路的实测结果与仿真结果基本一致。当输入功率为0 dBm时，整流电路的工作频段为1.44~1.66 GHz(14.2%)和3.35~3.54 GHz(5.5%)，在频带内可实现的最大整流效率分别为73.7%和69.5%。

Abstract:

A low-profile, compact dual-band rectifier circuit is proposed, which can be used in scenarios such as radio frequency energy harvesting and microwave power transmission. The proposed rectifier circuit does not employ an impedance matching network, and achieves dual-band characteristics using only two microstrip transmission lines: the first microstrip transmission line connects the Schottky diode(HSMS-2850) with the load and filter at the rear end of the rectifier circuit; the second microstrip transmission line is a half-wavelength microstrip transmission line, adding a second frequency band to the designed rectifier circuit. This design approach not only reduces the overall size of the rectifier circuit(0.14λ₀×0.11λ₀, where λ₀ is the wavelength corresponding to the lowest frequency), but also minimizes the losses introduced by additional matching structures. After theoretical analysis, simulation, and fabrication, the measured results of the rectifier circuit are essentially consistent with the simulated results. When the input power is 0 dBm, the operating frequency bands of the rectifier circuit are 1.44~1.66 GHz(14.2%) and 3.35~3.54 GHz(5.5%), with maximum rectification efficiencies achievable within the bands being 73.7% and 69.5%, respectively.