access icon free Design of wide-stopband microstrip bandpass filter with assistance of spur lines

© The Institution of Engineering and Technology
Received 23/09/2012, Published

A novel microstrip bandpass filter with compact size is proposed. With two short-circuited stubs, one open-circuited coupled line using symmetrical feeding, and two spur lines, a wide passband can be obtained. Detailed design and synthesis procedures are provided for filter development. Moreover, the electromagnetic simulator IE3D is used; the prototype of the bandpass filter is consequently fabricated and measured. Agreement between measured results and the theoretical prediction validates the proposed structure.

Inspec keywords: band-pass filters; band-stop filters; microstrip filters; coupled transmission lines

Other keywords: symmetrical feeding; open-circuited coupled line; IE3D electromagnetic simulator; wide-stopband microstrip bandpass filter design; spur line assistance; short-circuited stubs

Subjects: Filters and other networks; Waveguides and microwave transmission lines

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