Balanced BPSK modulator for Ka-band communication systems

✍ Scribed by Ashok Mittal; Asok De

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 338 KB
• Volume: 49
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.22910

✦ Synopsis

Abstract

This article details the design of balanced PSK modulator using integrated finline coplanar line hybrid junction. The PSK signal output is in suspended stripline with incident wave carrier in unilateral symmetric finline. Schottky barrier diodes MA4E2037 from M/ACom has been used for modulation. The balanced configuration offers high isolation between the carrier input port and the modulated carrier output port and thus the pulse width variations and amplitude deviations are suppressed. An insertion loss imbalance of ±1.5 dB with an average loss of 2.5 dB in the two switching states has been achieved over 37.0 to 38.0 GHz against the estimated loss of 2.0 dB. The phase imbalance is ±10° with phase switching from 165° to 185°. As the PSK output signal is in suspended stripline, two BPSK Modulators can easily be combined together to work as QPSK modulator for point to point millimeter wave radio links. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3046–3049, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22910