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A compact second harmonic-suppressed bandpass filter using π-equivalent transmission lines

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2 Author(s)
Chih-Lin Chang ; Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 106 R.O.C. ; Chao-Hsiung Tseng

In this paper, a compact second harmonic-suppressed bandpass filter is developed using π-equivalent transmission lines. A conventional quarter-wavelength microstrip can be equivalent to a π-equivalent transmission line realized by a high-impedance line with bilateral shunt low-impedance stubs. The circuit configuration of the π-equivalent transmission line is beneficial to miniaturize the circuit size by merging open stubs into a single stub, and provide a good harmonic suppression. A compact bandpass filter can be implemented with a 45.3% circuit size of the conventional one with a 30 dB spurious suppression up to 3.4 f0. The measured results of the developed bandpass filter are in a good agreement with the simulated results by the full-wave electromagnetic simulator.

Published in:

2010 Asia-Pacific Microwave Conference

Date of Conference:

7-10 Dec. 2010