Abstract
A parallel-strip phase inverter with a pair of simple impedance matching networks is designed. The phase inverter introduces the almost frequency independent 180° phase shift and was employed in the wideband parallel-strip balun. The balun was designed and measured with the maximum magnitude imbalance of 0.5 dB and the maximum phase imbalance of 6.0°. The proposed balun is used as input network for the wideband balanced frequency doubler. The proposed frequency doubler achieves significant conversion gain from 0.1 GHz to 1.7 GHz. The frequency doubler achieves 7.4 dB conversion gain and 23 dB fundamental signal suppression at 1 GHz.
Highlights
Differential radio frequency (RF) circuits are commonly found in the integrated circuits for wireless communication systems
A high performance balun design is critical for integrating the single-end and differential circuit in an efficient way
Many high performance balun designs based on the Wilkinson power divider were reported in [1, 4]
Summary
Differential radio frequency (RF) circuits are commonly found in the integrated circuits for wireless communication systems. A high performance balun design is critical for integrating the single-end and differential circuit in an efficient way. Many high performance balun designs based on the Wilkinson power divider were reported in [1, 4]. The parallel-strip line achieves a wide range of characteristic impedance lines and high performance balanced microwave components [5]. The parallel-strip phase inverter is realized by interconnecting the upper and lower conductors of a PCB through the two metal vias. In the balanced frequency doubler design, the two identical nonlinear devices such as biased transistors and diodes were fed by a differential signal that is generated from the balun by single signal source. A wideband balun based on Wilkinson power divider and parallel-strip inverter is proposed. Wideband frequency doubler based on the proposed balun is presented
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