Compact Left-Handed Transmission Line as a Linear Phase–Voltage Modulator and Efficient Harmonic Generator

Author

Kim, Hongjoon ; Kozyrev, Alexander B. ; Karbassi, Abdolreza ; Van der Weide, Daniel W.

Author_Institution

Dept. of Electr. Eng., City Coll. of New York, NY

Volume

55

Issue

3

fYear

2007

fDate

3/1/2007 12:00:00 AM

Firstpage

571

Lastpage

578

Abstract

We construct a synthetic left-handed transmission line with cascaded varactors and shunt inductors. By modulating dc bias, the capacitance of the varactors can be changed and modulation of the output phase state is possible. For frequencies from 4.7 to 6.4 GHz, a very linear phase variation versus voltages of over 200deg phase variation with low insertion-loss variation (plusmn0.5dB) is demonstrated. This circuit can also act as an efficient harmonic generator when a large signal is applied. Since the left-handed transmission line shows high-pass filter response, harmonics generated are not seriously attenuated. However, because this synthetic transmission line is a very dispersive medium, strong dispersions and instabilities may arise. The circuit size is determined by the diode size and lumped-element inductor, allowing it to be compact

Keywords

harmonic generation; inductors; metamaterials; modulators; phase shifters; transmission lines; varactors; 4.7 to 6.4 GHz; cascaded varactors; diode size; harmonic generator; high-pass filter response; linear phase-voltage modulator; lumped-element inductor; phase shifter; shunt inductors; synthetic left-handed transmission line; Capacitance; Distributed parameter circuits; Frequency; Inductors; Phase modulation; Power harmonic filters; Shunt (electrical); Transmission lines; Varactors; Voltage; Harmonic generator; left-handed transmission line; phase shifter; varactor;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2007.891692

Filename

4118407