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The characteristics of microstrip monopoles fed at the center with antiphase currents are investigated experimentally. First the impedance is measured as a function of frequency. It is found that the radiation resistance at the resonance nearL 05 λ, is very low while the radiation resistance at the resonance nearL very high. For a given physical length of the monopole, the resonant frequency is dependent on the strip width and the substrate thickness. The effect of substrate thickness and strip width on the input impedance and bandwidth has also been studied. Finally theE-plane radiation pattern is found to contain two maxima, occurring at approximately± 40 broadside.
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Dahele et al. (1983) studied this question.
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