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rule of stub in dual-band microstrip antenna

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sayma

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how the stub can make a dual band microstrip antenna?
what are the theory and mechanism?
 

Over different frequencies and around the resonance frequency of the microstrip antenna, the stub offers either capacitive or inductive impedance and realizes dual frequency response.
This is done placing an open circuit quarter wavelength stub, or short circuit half wavelength stub on the edges of a microstrip antenna, and tuning properly the stub dimensions.
 

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