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Based on the cavity model theory, a set of simple formulas and graphs for calculating both theradiation pattern bandwidth and the impedance bandwidth of a rectangular microstrip antennaare presented with experimental verification. Three kinds of approaches to broaden the bandwidthand their potentiality are reviewed and discussed. A simple broadband technique by means of com-bination of stub--matching and increasing the antenna thickness is developed. An experimentalelement with the thichness of 0. 05 wavelength is matched by using two stubs, while the input VSWRis measured to be less than 2:1 over a 13 % bandwidth.
Based on the cavity model theory, a set of simple formulas and graphs for calculating both of the radiation pattern bandwidth and the impedance bandwidth of a rectangular microstrip antennaare presented with experimental verification. Three kinds of approaches to broaden the bandwidthand their potentiality are reviewed and discussed. A simple broadband technique by means of com-bination of stub - matching and increasing the antenna thickness is developed. An experimentalelement with the thichness of 0. 05 wavelength is matched by using two stubs, while the input VSWRis measured to be less than 2: 1 over a 13% bandwidth.