Ka-Band Efficient Rectifier With Enhanced Power Capability Using Power Distributing Network and High-Q Bandstop Filter

This brief presents a Ka-band rectifier that utilizes power distributing technology to enhance its power handling capability. The matching network and power distributing network are integrated to simultaneously match the diode impedance and distribute power to eight Schottky diodes. A novel bandstop filter for millimeter-wave bands is proposed, which is composed of high <inline-formula> <tex-math notation="LaTeX">${Q}$ </tex-math></inline-formula> cylindrical cavities and a coaxial line. This filter not only effectively suppress harmonics but also exhibits low loss characteristics. The fabricated rectifier, operating at 35 GHz, shows a measured <inline-formula> <tex-math notation="LaTeX">$\unicode{0x007C}S_{11} \unicode{0x007C}$ </tex-math></inline-formula> of −20.3 dB and a power conversion efficiency of 61.9% at the input power of 29 dBm. Efficiencies under different loads are compared, and it is found that <inline-formula> <tex-math notation="LaTeX">$50 \Omega $ </tex-math></inline-formula> is the best load. To the best of our knowledge, this rectifier has the highest power capability among existing works. Due to its high-power capability and efficiency, this rectifier shows potential for use in wireless power transfer systems to provide power to electronic devices.