Abstract
A compact and broadband dual-mode dipole antenna is proposed in this paper. Fundamental mode (f 1) is combined with third-order mode (f 3) to widen the bandwidth. To do so, f 3 is compressed/down-shifted close to f 1. This is realized by loading a loop at the current null points of f 3. Loop parameters are the crucial parameters for third-order mode compression and, thus, for wide bandwidth. The antenna was fabricated. Measurements were performed. Simulations and measurements are in good agreement. The prototype of the antenna has an electrical size of 0.33λL × 0.08λL at the lowest frequency of the operational band. The obtained frequency band for |S 11| ≤ −10 dB is 2.83 GHz–6.08 GHz which amounts to 73% bandwidth. The measured peak gain is 3.1 dBi. Stable omnidirectional radiation is obtained over the entire impedance bandwidth.
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