A compact planar ultra‐wideband ring monopole antenna with a band‐notch feature is presented. The band‐notch characteristic is achieved by embedding a quarter‐wavelength tuning stub in the circular ring monopole. The notched band is controllable by adjusting the length of the tuning stub. The measured antenna radiation patterns show good omnidirectional performance across the operation bandwidth. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 125–126, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21283

A novel hybrid antenna structure that combines a rectangular dielectric resonator and a CPW-fed slot with tuning stub is proposed. The proposed antenna is designed to resonate at the lower (2.4 GHz) and upper (5.3 GHz) 802.11 WLAN frequency bands, respectively. Comparisons between the simulation and measurement results confirm the good properties exhibited by the proposed antenna.ABSTRACT: A miniaturized microstrip ring coupler with restricted minimum line width is proposed. The size-reduction limit for connecting open stubs on the inside of the ring is firstly derived and the miniaturized ring coupler based on the predicted minimum reduced size is designed and fabricated.

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