Existing broad-band planar spiral antennas have a cavity loaded with absorbing material. AS a result, they are bulky and lossy. Existing microstrip antennas are narrow-banded aess than 10%). In this paper, the design of spiral-mode microstrip antennas with a bandwidth of 6:l is demonstrated. This new antenna has a small dissipative loss due to a resistive loading outside its active region.
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