一种新型高效宽带整流电路

A novel rectifying circuit with high efficiency and wide bandwidth

提出一种新型高效宽带整流电路。通过在整流二极管前端串联一段微带线的方式,在其呈感性的范围内调节其长度,抵消二极管在基频上产生的容抗,使阻抗匹配时可以采用1/4波长阻抗变换方式取代单枝节匹配的方式,因而该整流电路的整体结构紧凑,同时拓展了工作带宽。改进直流滤波结构中的扇形枝节,根据其影响直流电压波形的现象调节其尺寸,使得输出直流电压纹波平稳,进一步提高整流效率。设计了一只5.8 GHz整流电路,测试表明,输入功率在0~16 dBm的范围内,该电路整流效率都在55%以上,最高效率达到78.7%;在13 dBm输入功率时,达到70%以上整流效率的相对带宽有16.6%。

A novel high-efficiency and wide bandwidth rectifying circuit is proposed.By connecting a microstrip line in series at the front end of the rectifying diode,and adjusting the length of the line within its inductive range,the capacitive reactance generated by the diode at the fundamental frequency can be offset,and thereby a good impedance matching is realized by using the 1/4 wavelength impedance conversion method rather than the single branch matching method.In this way,the circuit is able to achieve a compact structure and meanwhile an enhanced working bandwidth.Moreover,the design of the sector branch in the direct current(DC)filter has been improved,e.g.its length of branch is adjusted according to its effect to the DC voltage waveform,so that the output DC voltage ripple can become more stable,and hence the rectifying efficiency of the circuit can be improved.A rectifying circuit working at 5.8GHz has been designed.Measurement results show,when the input microwave power is in a range of 0~16 dBm,the rectifying efficiency of the circuit is over 55%with a maximum value up to 78.7%;at an input microwave power of 13dBm,the circuit realizes a bandwidth of 16.6%for the rectifying efficiency more than 70%.