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A design methodology for the realization of multi-decade baluns at microwave frequencies

Smith, Robert Martin, Cripps, Stephen Charles, Tasker, Paul J., Benedikt, Johannes and Lees, Jonathan 2011. A design methodology for the realization of multi-decade baluns at microwave frequencies. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011. Published in: Seigel, Peter, Remley, Kate, Tzuang, C. and Ponchak, George eds. 2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE, pp. 1204-1208. 10.1109/MWSYM.2011.5972702

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Abstract

A new methodology is presented for designing baluns exhibiting multi-decade bandwidths at microwave frequencies. Simulations show that resistors terminating the outer transmission line suppress the half-wavelength resonance and greatly extend the bandwidth. Using linear measurements at microwave frequencies, ferrite beads have been shown to behave as resistors with a small reactance, suitable for terminating the outer transmission line. This paper shows that ferrite beads can perform the dual role of improving magnetic coupling at low frequency and suppressing resonance at higher frequencies. The design methodology was applied to produce a balun that operates between 30MHz and 6GHz, displays less than 1dB of power loss up to 4.4GHz, and delivers an impedance transformation of 2:1.

Item Type: Conference or Workshop Item (Paper)
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords: Broadband amplifiers; design methodology; ferrites impedance matching; transmission lines; wideband
Additional Information: Proceedings of a meeting held 5-10 June 2011, Baltimore, Maryland, USA
Publisher: IEEE
ISBN: 9781612847542
Last Modified: 04 Jun 2017 03:01
URI: http://orca-mwe.cf.ac.uk/id/eprint/15574

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