Harmonic suppressed single groove PCML bandpass filter

• Main Authors: Marimuthu, Jayaseelan, Esa, Mazlina
• Format: Conference or Workshop Item
• Published: 2009
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/15259/; http://ieeexplore.ieee.org/document/5296168/
• Institution: Universiti Teknologi Malaysia

This paper presents the design of single grooved parallel-coupled microstrip bandpass filter with improved passband response and first harmonic suppression. The undesired first harmonic spurious response is suppressed through transmission zero frequency realignment method. A single groove is located at the center of the parallel-coupled line. It is employed for the realignment of the transmission zero and first harmonic frequencies. Two three-stage bandpass filters of different operating bandwidths were designed and implemented with optimized groove. The measured results validate real harmonics suppression performance with controllable single groove dimensions.