Abstract
A compact filtering dipole antenna with wideband filtering performance is proposed for 5G applications. Wideband balun bandpass filter (BPF) and a balanced dipole antenna are integrated to be a filtering antenna. Wideband balun BPF is realized by using a short-circuited stub-loaded triple mode resonator. To convert unbalanced input signal into a pair of balanced output signals, a microstrip-to-slotline transition structure is utilized. The coupling between the resonator and the antenna can be achieved by adjusting the size of slotline. A transmission zero is produced in the stopband, improving the differential-mode (DM) passband selectivity. Finally, a filtering antenna with central frequency of 3.3 GHz and fractional bandwidth of 22.4% is designed. Experimental results achieve a 5.1 dBi radiation gain over the operating band.
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