Compact spiral folded spurline for low-frequency applications.

A compact spurline design using spiral folding of the resonator is proposed. Length reduction of up to 83% is achieved making the technique useful for lower microwave frequencies. One-section spurline bandstop filters of both conventional and the new design with a centre frequency of 600 MHz have been tested and compared. There is satisfactory agreement between the performance of the new and the conventional designs. [ABSTRACT FROM AUTHOR]