Abstract
Abstract. Distributed bandpass or band-reject filters generally become larger as the design center frequency decreases. To achieve suitable filters with small dimensions even at center frequencies below 2 GHz, ceramic resonators can be used. These components essentially represent transmission lines with a specified, potentially large permittivity, making them physically short while maintaining a desired electrical length. In this paper, Chebyshev-approximated band-reject filters using capacitors and transmission lines, the latter being represented by ceramic resonators, are investigated. Three filter prototypes are built and their performance is evaluated by measurements. Reasonable bandstop filter properties are found, which are the better the narrower the filter bandwidth is.
Highlights
In various high frequency applications, the use of bandstop filters is necessary to remove a certain frequency band from a signal
Chebyshev bandstop filters consisting of lumped capacitors and inductances theoretically provide an ideal Chebyshev or equi-ripple frequency response
The size of a resonator generally depends on the wavelength of the desired stopband center frequency, the resulting filter dimensions may become too large for lower radio frequency (RF) frequencies, e.g., below 2 GHz
Summary
In various high frequency applications, the use of bandstop filters is necessary to remove a certain frequency band from a signal. In the corresponding filter design, one often makes use of so-called Chebyshev filters These exhibit an adjustable ripple in the passband, where the sharpness of the cut-off increases with larger ripple (Pozar, 2012). The corresponding bandstop filters provide small weight and size, the resulting frequency response is not of a common shape as a Chebyshev filter would be, and the upper passband is degraded. Another approach has been considered in (Schiffman and Matthaei, 1964; Schiffman, 1965). A procedure based on slope parameters is investigated to approximate Chebyshev bandstop filters using ceramic resonators.
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