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Negative Impedance in MicroStrip Circular

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marceloassilva

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Hello
Reading the Ballanis's book, I noticed that the impedance of a circular microstrip antenna mode TM010 positive begin, however watching a experimental measured notice that the impedance values ​​begin with negative imaginary. Anyone know tell me why?

Balanis Microstrip 2.JPGExperimental.jpg
 

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