The performance comparison of frequency translators using RHTL and LHTL phase shifters

Heejae Han, Hongwoo Park, Hongjoon Kim

Research output: Contribution to journalArticlepeer-review


In this paper, we compared the performances of the Right Handed Transmission Line (RHTL) and the Left Handed Transmission Line (LHTL) phase shifters as a frequency translator. Unlike other phase shifters, both phase shifters show a 0°-360° phase variation for a broadband frequency and compact in size which are ideal to use as a frequency translator. For the performance comparison, we fabricated both a RHTL and a LHTL phase shifter to cover 1.5 GHz - 2.4 GHz range with the whole 360° phase variation. For the frequency range, a LHTL based frequency translator showed a much better performance whose Spurious Free Dynamic Range (SFDR) is 4dB - 17dB higher than the RHTL based frequency translator when the sawtooth modulation freqncy is 11 kHz. This is due to the linear phase-voltage variation of LHTL phase shifter. Furthermore, the LHTL phase shifter shows a less insertion loss and a insertion loss variation than the RHTL phase shifter. Overall, the LHTL based frequency translator outperformed RHTL based freqency translator.

Original languageEnglish
Pages (from-to)371-375
Number of pages5
JournalTransactions of the Korean Institute of Electrical Engineers
Issue number3
StatePublished - Mar 2014


  • Frequency translator
  • LHTL
  • Phase shifter
  • RHTL
  • SFDR


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