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Presented is a fat dipole antenna having square radiating elements fed by a broadband balun based on coplanar‐waveguide (CPW)‐to‐slotline field transformation followed by multi‐section slotlines for impedance transformation. The measured results of the broadband balun show a passband of 500 MHz to 5 GH and insertion loss less than 1 dB. The amplitude imbalance is approximately 0.38 dB and the phase imbalance is less than 4.5o over the entire operation range. In this design, by co‐designing the radiating element with the broadband balun, a fat dipole antenna covering from 3 to 5 GHz with an omnidirectional radiation pattern and a maximum gain of 2 dBi is designed, while retaining a size of 38.9 × 80.6 mm. [ABSTRACT FROM AUTHOR]