Title :
Realization of a Filter with Helical Components
Author :
Zverev, A.I. ; Blinchikoff, H.J.
Author_Institution :
Network Synthesis,Md.
fDate :
9/1/1961 12:00:00 AM
Abstract :
In the VHF range, high-quality narrow-band filters with reasonable physical dimensions are extremely difficult to realize. Excessive pass-band insertion loss accompanies filters employing lumped constant elements, and unreasonable size is a natural consequence of coaxial-resonator filters. Harmonic crystal filters are inadequate because of the unpredictable amount of spurious modes above the harmonic frequency; and hence they can only be used for very low percentage bandwidths. A solution to the above problems is provided by the use of helical resonators for high-quality filters. This paper describes the helical resonator, measurement of its Q, and coupling to the resonator. A procedure for the design and construction of a filter using helical circuits is then presented. Finally an example is given illustrating the design method, and several photographs of helical-resonator filters are shown.
Keywords :
Band pass filters; Bandwidth; Coaxial components; Coupling circuits; Frequency; Insertion loss; Narrowband; Power harmonic filters; Q measurement; Resonator filters;
Journal_Title :
Component Parts, IRE Transactions on
DOI :
10.1109/TCP.1961.1136604