Summary
International Symposium on Antennas and Propagation
2011
Session Number:ThG1
Session:
Number:ThG1-5
Broadband, Low Spurious Single Sideband Modulation With a Linear Tunable Phase Shifter
Hongjoon Kim,
pp.-
Publication Date:2011/10/25
Online ISSN:2188-5079
Summary:
This paper presents a broadband, low-spurious frequency translation method using a linear tunable phase shifter. The linear tunable phase shifter is based on the left-handed nonlinear transmission line (LH NLTL) and can achieve a very linear phase variation as a function of applied DC bias for a broadband frequency that facilitates a low spurious, broadband frequency translation. Our experiment demonstrates that the LH NLTL enables frequency shift with 30 dB maximum spurious suppression. For any frequency between 3 GHz and 3.8 GHz, the phase shifter can have 0° - 360° linear phase variation and is possible to achieve 100 kHz ? 1 MHz frequency shift while the range of spurious suppression is between 21 dB and 30 dB. As the proposed LH NLTL can be fabricated with lumped-elements only, the size is very compact. This circuit will be very useful for microwave instrumentation or coherent communication system where single sideband modulation is required.