Design and implementation of inverse legendre microstrip filter.

ABSTRACT The inverse Legendre filter response is derived and its property is analysed by providing the magnitude specifications in the passband and stopband. The inverse Legendre function requires the identical order n as its Legendre counterpart. A quantitative comparison is carried out between Chebyshev, inverse Chebyshev, Legendre and inverse Legendre to show the improved characteristics of the inverse Legendre filters depending on specifications and criteria. The inverse Legendre filter shows maximally flat characteristic in the passband and in comparison to other filters, it exhibits improved group delay characteristics. Finally, the filter is implemented in microstrip low pass configuration and a prototype model of the proposed filter configuration is developed and measured. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:69-73, 2017 [ABSTRACT FROM AUTHOR]