Dual electromagnetic bandgap CPW structures for filter applications

• Published in: IEEE microwave and wireless components letters Vol. 13; no. 9; pp. 393 - 395
• Main Authors: Martin, F., Falcone, F., Bonache, J., Lopetegi, T., Laso, M.A.G., Sorolla, M.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.09.2003; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Band pass filters; Banded structure; Bandwidth; Capacitance; Circuit properties; Coplanar waveguides; Devices; Electric, optical and optoelectronic circuits; Electromagnetic waveguides; Electronic circuits; Electronics; Exact sciences and technology; Frequency; Frequency filters; Low pass filters; Metamaterials; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Microwaves; Modulation; Periodic structures; Photonic band gap; Slow waves; Performance evaluation; electromagnetic bandgap (EBG); Energy gap; Coplanar waveguide (CPW); Insertion loss; Capacitive load; microwave filters; Low pass filter; Coplanar waveguides; Microwave filter; Periodic structure
• ISSN: 1531-1309; 1558-1764
• DOI: 10.1109/LMWC.2003.817149

A novel coplanar waveguide (CPW) low pass filter based on electromagnetic bandgaps (EBG) with double periodicity has been designed and fabricated. The device consists on a CPW with T-shaped loading capacitances at periodic positions and slot width modulation. By properly choosing the ratio between the two periods of the structure, a huge band gap (more than five times the bandwidth) is obtained through the suppression of spurious frequencies. The fabricated prototypes also exhibit very sharp cutoff, very low insertion loss in the passband and slow wave effect.