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Some general formulae for the properties of single tuned electrically small antennas are reviewed. For many types of such antennas, their impedance around resonance behaves like either a series tuned or parallel tuned LCR resonator. The effect of deliberately increasing Ohmic losses in order to improve bandwidth is investigated. While the impedance bandwidth can improve, the ratio of radiated power...
A novel hybrid high impedance surface is presented and a beam steerable four feed square loop antenna is built on this structure. At a test frequency of 4.7 GHz, the proposed hybrid high impedance surface based square loop antenna is 4.69 mm high and has an impedance bandwidth of 650 MHz and directivity of 8.7 dBi. Compared with the earlier reported steerable square loop antenna the new antenna s...
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