Title :
Compact Legendre low-pass filters for microwave applications
Author :
Kumar, Ajit ; Chaudhari, Nainu P. ; Verma, Anil Kumar
Author_Institution :
Dept. of Electron., Univ. of Delhi, New Delhi, India
Abstract :
This paper presents the design of Legendre group of lowpass filters using DGS for microwave application. Legendre Polynomial Product (LPP)-312 and 213 filters have reduced group delay variation in the passband, achieved sharper cut-off and wider impedance matching BW. The measured selectivity of 5-pole Legendre, LPP-312 and LPP-213 lowpass filters are 28.3 dB/GHz, 18.8 dB/GHz and 18.2 dB/GHz. Their 20dB rejection BW (RBW) are 6.0 GHz, 7.7GHz and 7.9 GHz respectively. The LPP-213 has better 15dB matching BW (94%) and more 20dB rejection BW(7.3GHz).
Keywords :
Legendre polynomials; impedance matching; low-pass filters; microwave filters; 5-pole Legendre lowpass filters; LPP-213 lowpass filters; LPP-312 lowpass filters; Legendre polynomial product filters; compact Legendre low-pass filters; frequency 6.0 GHz to 7.9 GHz; group delay variation; impedance matching; microwave applications; Defected ground structure (DGS); Legendre LPF; Low Pass Filter (LPF);
Conference_Titel :
Microwave and RF Conference, 2013 IEEE MTT-S International
Conference_Location :
New Delhi
DOI :
10.1109/IMaRC.2013.6777734
