Comparative performance of some polynomial-based lowpass filters for microwave/digital transmission applications |
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| Authors: | Ashwani Kumar Anand Kumar Verma |
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| Affiliation: | 1. Department of Electronics, Sri Aurobindo College, University of Delhi, New Delhi, India;2. Microwave Research Laboratory, Department of Electronic Science, University of Delhi South Campus, New Delhi, India;3. Department of Electronics, Macquarie University, Sydney, Australia |
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| Abstract: | This paper reports on the comparative performances of some polynomial based lowpass filters in the lumped elements, microstrip and defected ground structure (DGS) environment. The microwave designers are normally familiar with Butterworth, Chebyshev and Bessel filters. However, many more polynomials based, ripple and non-ripple types LPF have been suggested for the low-frequency applications. Some of these LPF, such as L-opt, H-type, Transitional Butterworth-Legendre (TBL), Pascal, Legendre group of LPF, are compared for their applications in analog microwaves, digital transmission, efficiency enhancement of the linear power amplifiers and five level partial response modulations. A method is reported to compute the ripple frequency for the Legendre group of LPF and Pascal LPF. Further, a design is suggested to significantly improve group delay performance of high selectivity filters. |
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| Keywords: | Defected ground structure (DGS) Halpern LPF low pass filter (LPF) Legendre LPF Transitional Butterworth Legendre (TBL) Pascal LPF |
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