A microstrip line, which is open at one end and extends to infinity toward the other end, has a center conductor width =0.4λo, substrate height of 0.05λo, and it is operating at 10GHz. The dielectric constant of the substrate is 2.25 . This type of microstrip line is used to construct rectangular patch antennas. Determine the following:
(a) The input admittance (real and imaginary parts) of the microstrip line at the leading open edge. Is it capacitive or inductive?
(b) What kind of a lumped element (capacitor or inductor) can be placed at the leading open edge between the center conductor of the line and its ground plane to resonate the admittance? What is the value of the lumped element?
(c) The new input impedance, taking into accoumt the presence of the lumped element.