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Design of broad-band lumped-element baluns with inherent impedance transformation

Dan Kuylenstierna (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Peter Linnér (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik)
IEEE Transactions on Microwave Theory and Techniques (0018-9480). Vol. 52 (2004), 12, p. 2739-45.
[Artikel, refereegranskad vetenskaplig]

This paper reports on a novel lumped balun topology, the second-order lattice balun, with broad-band performance. The design is based on synthetic transmission lines operating as impedance transformers. The characteristic impedance of the synthetic transmission lines may be chosen to obtain inherent impedance transformation. An analytical investigation results in closed formulas for optimum performance over a given bandwidth. It is shown that it is possible to design for equal ripple in amplitude balance and input reflection coefficient. The phase balance is theoretically perfect over the entire bandwidth. The concept is experimentally validated by a 1-GHz prototype fabricated with surface mounted chip components. It exhibits an amplitude balance better than 0.5 dB and a phase balance better than +or-8 degrees over an octave bandwidth. The effective area of the prototype is 7 * 9 mm/sup 2/

Nyckelord: baluns, impedance convertors, lumped parameter networks, MMIC, network synthesis, network topology, transmission line theory

Denna post skapades 2006-08-29. Senast ändrad 2007-05-02.
CPL Pubid: 11862


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik


Elektroteknik och elektronik

Chalmers infrastruktur