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When patch segments of different widths are adjoined to form a microstrip antenna, the resonant frequency is significantly lower than that of a conventional rectangular microstrip antenna with the same overall length. It is shown, however, that the radiation efficiency is substantially reduced as the antenna becomes small at a given frequency. As the resonant frequency decreases, the radiated power is lowered at a faster rate than the conduction and dielectric losses.
Date of Publication: Feb. 2005