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A probe‐fed annular‐ring microstrip antenna with a photonic bandgap (PBG) ground plane operating in the higher order mode of TM21for conical‐pattern radiation is experimentally demonstrated. The antenna studied is printed on a thin FR4 substrate (relative permittivity 4.4) and, owing to the PBG ground plane used, significant improvements in the antenna performances are observed. The obtained impedance bandwidth is doubled, and the antenna gain is enhanced by about 7 dBi. Details of the experimental results are presented and discussed.
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Lin et al. (2001) studied this question.
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