| Title |
The Performance Comparison of Frequency Translators Using RHTL and LHTL Phase Shifters |
| Authors |
한희제(Han, Heejae) ; 박홍우(Park, Hongwoo) ; 김홍준(Kim, Hongjoon) |
| DOI |
https://doi.org/10.5370/KIEE.2014.63.3.371 |
| Keywords |
Phase shifter ; Frequency translator ; LHTL ; RHTL ; SFDR |
| Abstract |
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. |