Low-loss continuous true time delay with delay summing

Kyutae Park, Byung Wook Min

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

2 Citations (Scopus)


This paper presents a delay sum true time delay (TTD) architecture. The proposed TTD divides the input signal to two signals with different time delays, then combines them in-phase at the output port. The variable time delay can be achieved by changing the power dividing and combining ratio of the two signals. The proposed TTD can provide lower insertion loss than varactor-loaded transmission line or switched delay line TTD, since it can achieve the large and continuously controlled time delay with a compact size. Also, this paper proposes a variable power divider/combiner with an increased range of the power dividing/combining ratio. The proposed delay sum TTD is demonstrated at 2.4 GHz. The measured insertion loss is only 2.3±0.25 dB with the continuously tunable delay of 843 ps (>720°), while maintaining the impedance matching below -10dB.

Original languageEnglish
Title of host publicationIMS 2020 - 2020 IEEE/MTT-S International Microwave Symposium
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9781728168159
Publication statusPublished - 2020 Aug
Event2020 IEEE/MTT-S International Microwave Symposium, IMS 2020 - Virtual, Los Angeles, United States
Duration: 2020 Aug 42020 Aug 6

Publication series

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


Conference2020 IEEE/MTT-S International Microwave Symposium, IMS 2020
Country/TerritoryUnited States
CityVirtual, Los Angeles

Bibliographical note

Funding Information:
ACKNOWLEDGMENT This work was supported by Space Core Technology Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2017M1A3A3A02016255).

Publisher Copyright:
© 2020 IEEE.

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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