| 摘要 |
An antenna ( 100 ) comprises an input port ( 109, 213 ) for feeding an electrical signal, a radiating element ( 220 ) coupled to the input port that radiates energy of the electrical signal, a second port ( 110, 211 ) coupled to the radiating element, a ground structure ( 214 ) coupled to the radiating element and second port; and a negative slope reactance circuit ( 120 ) characterized by a negative slope of reactance versus frequency, coupled to the second port. The antenna has a wideband frequency range relative to a natural bandwidth of the antenna.
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