Tonne Software

The Windows ® program for designing helical-resonator-based bandpass filters

This is a graphics-intensive bandpass filter design and analysis program based on the helical resonator.

Here are the highlights of this program:

Adjusting your own helical-resonator-based bandpass filters can be tricky. Consider visiting a commercial operation such as this one:
(We can vouch for the quality of their products.)

Updated to 2.10 - Found and corrected conditional error in Zgen entry; more interface refinements
Updated to 2.09 - Added metric dimensions to output; more interface refinements
Updated to 2.08 - Significant rewrite of several pages making various entries easier
Updated to 2.07 - Total rewrite of Pictorial page, error trapping of impedance entry
Updated to 2.06 - Major rewrite of every part of the program to greatly improve the interface
Updated to 2.05 - added note "Dimensions are in inches"
Updated to 2.04 - corrected failure to use correct value of Q for inductors in analysis via equivalent circuit
Updated to 2.03 - show unloaded resonator Q values, both round and square chambers


Coaxial Resonators with Helical Inner Conductor
W. W. Macalpine
Proceedings of the I.R.E., December 1959

Need A Helical Filter?
Lee R. Watkins
RF Design, May/June 1981

Realization of a Filter With Helical Components
A. I. Zverev and H. J. Blinchikoff
I.R.E. Transactions on Component Parts
Volume CP8, September 1961

Design Of A New, Low-Cost Helical-Resonator Filter
Solomon I. Hecht
Microwaves, February 1966

Helical Filters (Chapter 9)
A. I. Zverev
Handbook of Filter Synthesis
John Wiley & Sons, 1967
Library of Congress Card Number 67-17352

Helical-Resonator Filter Design,
Vincent G. Heesen
RF Design, July 1985