Bow-tie antennas with folded elements are investigated. Simulations and measurements show that the lowest operation frequency (VSWR 2) is lowered by the addition of the folded elements. This means that antenna area can be reduced by 49% (with one folded element) and 71% (with two folded elements), if the lowest operation frequency is not changed.Introduction: It has been reported that folded loop antennas [1, 2] and planar folded dipole antennas [3, 4] exhibit wideband properties in excess of 50%. In these antennas, the addition of a thin folded element to the simple dipole antenna can change the antenna characteristics drastically. One example of a wideband antenna is the bow-tie antenna (BTA) [5] with its self-complementary structure. In this Letter, the effect of adding the folded construction to the BTA is reported. It will be shown that this approach can greatly reduce the size of the folded bow-tie antenna (FBTA). BTAs with one folded element (hereinafter referred to as FBTA1) and two folded elements (FBTA2) are investigated. Both simulated and measured antenna performance results are discussed.
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