18.7 GHz 4-Bit PIN diode Reflection Type Phase Shifter for radiometer phased array antenna

Kim Tuyen Trinh, Jiewei Feng, Nemai Chandra Karmakar

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

2 Citations (Scopus)


A design of 18.7 GHz PIN diode Reflection Type Phase Shifter (RTPS) for Ku-band soil moisture radiometer phased array antenna is presented. The compact reflective loads are designed using PIN diodes to control phase shifts. The PIN diodes are MACOM's MA4FCP200. The designs sequence is to start with modelling PIN diode equivalent circuits at 18.7 GHz. Then a quadrature hybrid coupler and PIN diode reflective loads are designed. A PIN diode in forward and reverse states is considered as lumped components when designing the reflective loads. This approach offers more freedom when designing loads with high accuracy. The phase shifter is fabricated directly on the same Taconic TLX8 laminate with the feed network, this allows producing a monolithic phased array and reduces the cost of the whole system significantly. The simulated results show that the 4-bit phase shifter can yield 4.7 dB insertion loss (IL) and the input and output return losses (RL) are higher than 15 dB at 18.7 GHz. The phase resolution is 22.5° with the root mean square (RMS) phase error of about 1°. The measured results of the prototypes of 180°and 90° bits show a good agreement between simulation and measurement. The size of the phase shifter is quite compact, just about 2.8 cm x 0.6 cm.

Original languageEnglish
Title of host publicationICREST 2021
Subtitle of host publication2nd International Conference on Robotics, Electrical and Signal Processing Techniques
EditorsMd. Abdur Rahman
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)9780738130408
Publication statusPublished - 2021
EventInternational Conference on Robotics, Electrical and Signal Processing Techniques 2021 - Bangladesh, India
Duration: 5 Jan 20217 Jan 2021
Conference number: 2nd
https://ieeexplore-ieee-org.ezproxy.lib.monash.edu.au/xpl/conhome/9330807/proceeding (Proceedings)
https://icrest.aiub.edu (Website)


ConferenceInternational Conference on Robotics, Electrical and Signal Processing Techniques 2021
Abbreviated titleICREST 2021
Internet address


  • hybrid coupler
  • Ku-band
  • PIN diode
  • reflection type phase shifter

Cite this