This paper describes the design, measurement, and modeling of a linear inverted-F antenna with loading to increase the impedance bandwidth. In this case, two L-shaped wire structures are connected to the open end of the inverted-F element, yielding an impedance bandwidth of 10% in the 1800 MHz band. Measurements of return loss, impedance bandwidth, and gain are presented. The radiation pattern and polarization purity are discussed. The modeling of the antenna is based on a method of moments/GTD technique. A comparison with experimental results is presented. A comparison is also made with the popular planar inverted-F antenna.
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Ammann et al. (2000) studied this question.
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