A new approach for the design of planar ultra‐wideband (UWB) antennas having multiple band‐notched functions is studied and presented. In this approach, a planar dual‐stopband filter based on a dual‐mode resonator is first investigated carefully, which employs a half‐mode substrate‐integrated waveguide cavity to improve the quality (Q) factor. Then, this filter is applied to the design of a UWB antenna with dual band‐notched characteristics. Finally, two triple band‐notched antennas are implemented by incorporating two different resonators in the radiation element of the UWB antenna, respectively. Voltage standing wave ratio (VSWR), gain, and radiation pattern are measured. High and sharp band‐rejection characteristic for each of the frequency notch as well as a very wide impedance bandwidth is achieved.
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Dong et al. (2008) studied this question.
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