Abstract
AbstractNew bandstop/bandpass microstrip structures with harmonic suppression are presented in this article. By replacing the series quarter‐wavelength connecting lines of conventional open‐stub bandpass/bandstop filters with the equivalent Π‐shaped line section, compact open‐stub bandstop/bandpass filters with second harmonic suppression are achieved. Transmission‐line theory is used to derive the design equations of the equivalent Π‐shaped lines. Simulation and experiments have also been done to validate the proposed design concept. When compared with the conventional open‐stub Bandpass/Bandstop filters, the second harmonic is suppressed and size reduction is achieved in both the Bandstop/bandpass structures. Moreover, results confirm that the proposed shaped bandpass filter achieves a further third harmonic rejection. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2109–2114, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24580
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