A dual-band 90-degree SiGe HBT active phase shifter using band-pass and band-stop designs

A Dual-Band 90-Degree SiGe HBT Active Phase Shifter Based on Band-Pass and Band-Stop Designs Using Dual-Band Resonators

“…The reflection type [4] and the loaded-line type [6] are based on passive phase shifter designs and thus the insertion loss is large. On the other hand, the vector-sum type [8] and our work [1] are an active phase shifter and thus have an insertion gain. Moreover, the phase shifters in [4], [6] and [8] are analogously controlled and thus the complex control is needed.…”

“…This paper is an extension of the work originally presented in the 47th European Microwave Conference, 2017 [1]. Recently, multi-band phase shifters are being developed for the next generation multi-band and multi-mode wireless communication systems using active phased array modules and/or beam-forming networks [2]- [3].…”

“…However, there was no report on the low-pass high-pass phase shifters for the multi-band or multi-mode applications. In order to address this issue, a novel dual-band active phase shifter using band-pass and band-stop designs has been presented in [1]. The active phase shifter is based on a differential amplifier and employs two types of different loads, that is, band-pass or band-stop filters.…”

“…Although the conventional low-pass high-pass phase shifters [13]- [14] are limited to single-band operation, band-pass and band-stop designs can make multi-band operation available. In [1], 90-degree phase shifting has been successfully achieved at dual-band by switching two output ports of the differential amplifier. From the viewpoint of multi-band phase shifting as well as high gain, the active phase shifter is considered to be one candidate for achieving various phase shifting at multiple bands, which would be used in the next generation multi-band or multi-mode wireless communication systems with active phased array antenna and beam forming networks.…”

“…From the viewpoint of multi-band phase shifting as well as high gain, the active phase shifter is considered to be one candidate for achieving various phase shifting at multiple bands, which would be used in the next generation multi-band or multi-mode wireless communication systems with active phased array antenna and beam forming networks. To extend the work [1], the dual-band passive phase shifter based on band-pass and band-stop designs is newly described, showing that the dual-band 90-degree phase shifting is unavailable because of a low Q-factor of the circuit elements. Then how to address this design issue is presented by utilizing 180degree out of phase performance of the differential amplifier.…”