Wideband Switchable-Capacitor Loaded Differential Phase Shifter with Lattice Structures

Sungwon Kwon, Minjae Jung, Byung Wook Min

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper presents a differential K/Ka-band switchable-capacitor loaded phase shifter with lattice structures using 28-nm CMOS technology. The lattice structure, which has a wideband characteristic, is loaded with switchable-capacitors and provides 22.5° phase shift. Seven of the lattice phase shifters are cascaded with a switched line 180° phase shifter, resulting in a full 360° phase shifter. The measured bandwidth for a root mean square (rms) phase error of < 5° is from 22.5 to 33.5 GHz, where the rms amplitude error is < 0.53 dB. The measured insertion loss is $\mathbf{11.6}\pm \mathbf{0.8}\mathbf{dB}$ at 28 G Hz, and the input and output return losses are both> 10 dB from 22.5 to 33.5 GHz. Over the 5G NR bands at 28 GHz (24.25 to 29.5 GHz), rms phase error is < 2.4° and rms amplitude error is < 0.49 dB. The fabricated phase shifter has a size of 0.45 mm2 excluding pads. The proposed K/Ka-band phase shifter based on lattice structures has a wide bandwidth while maintaining low rms phase and amplitude errors.

Original languageEnglish
Title of host publication2022 IEEE/MTT-S International Microwave Symposium, IMS 2022
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9781665496131
Publication statusPublished - 2022
Event2022 IEEE/MTT-S International Microwave Symposium, IMS 2022 - Denver, United States
Duration: 2022 Jun 192022 Jun 24

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X


Conference2022 IEEE/MTT-S International Microwave Symposium, IMS 2022
Country/TerritoryUnited States

Bibliographical note

Funding Information:
ACKNOWLEDGMENT This work was supported by Samsung Electronics Co., LTD (IO201209-07875-01), and IITP grant funded by the Korea government(MSIT) (No. 2020000218). The EDA tool was supported by the IC Design Education Center(IDEC), Korea.

Publisher Copyright:
© 2022 IEEE.

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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