Quarter-wavelength Side-coupled Ring Research Articles

COMPACT WILKINSON PASS-BAND FILTERING POWER DIVIDER BASED ON QUARTER-WAVELENGTH SIDE-COUPLED RING

A Wilkinson power divider with improved bandpass filtering and high isolation performance is proposed. These characteristics are achieved by replacing the quarter-wavelength transmission line in the conventional coupled line Wilkinson power divider with quarter-wavelength side-coupled ring (QSCR). Additional features such as DC blocking between arbitrary two ports, single-layer via-less structure for low-cost fabrication and convenient integration (as only one isolation resistor required) are highlighted. A 2-GHz Wilkinson microstrip power divider with a fractional bandwidth of 4% has been fabricated and experimentally characterized. The consistency between simulated and measured results validates the effectiveness of our proposed design.

Synthesis of quarter wavelength side‐coupled ring (QSCR) resonator applications to bandpass filters design

AbstractThis article deals with the design of dual‐mode ring resonator fed by quarter wavelength coupled‐lines and its applications for bandpass filters. A specific synthesis was developed for ring‐based resonator which made ease the design of further bandpass filters. Three compact bandpass filters were designed at 2 GHz. Comparison between experiments and simulated results proved both synthesis accuracy and QSCR‐based filters efficiency toward electrical performances and size reduction. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 307–312, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23067