HeliCal Helical is a graphics-intensive bandpass filter design.
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HeliCal Description

Helical is a graphics-intensive bandpass filter design and analysis program based on the helical resonator. Main features: - The program designs bandpass filters with a selection of the order from 2 to 12, odd or even. - Center frequency, bandwidth, and passband ripple are all adjustable. The ripple value may be set to zero for a Butterworth response. - The dimensions of the individual resonators are set by specifying an impedance value. Then the actual terminating impedances are separately chosen. - Analysis is based on an equivalent circuit using capacitive input, interstage and output coupling. - Analysis is delivered in both tabular and graphical form and includes transmission, return loss, phase, envelope delay and input impedance with its angle. - The dimensions of the resonator(s) delivered by the program are shown in graphical form.

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