On a simplified rat-race and its experiment using commercial chip capacitors and inductors

With respect to the transmission line rat-race circuit used in microwave band applications, we discuss a procedure for deriving a simplified lumped-element rat-race, and a hand-made circuit using commercially available chip capacitors and inductors. A lumped-element rat-race can be derived from the standard rat-race using /spl pi/ equivalent circuits and a T equivalent circuit and then simplified. The measured frequency characteristics of the derived circuit are in good agreement with the theoretical characteristics.

I. Introduction

With respect to a circuit called rat-race in a microwave band, the procedure for deriving a simplified lumped-element rat-race, and a hand-made circuit using commercially available chip capacitors and inductors are discussed. The measured frequency characteristics are in good agreement with theoretical characteristics.