A compact duplex filtering antenna using a T‐shape probe‐fed patch and hairpin resonators is proposed. First, the T‐shape probe‐fed patch is designed as a dual‐band radiation element by connecting a microstrip line to the patch. Then the dual‐band radiation element is coupled to two bandpass filters based on half‐wavelength hairpin resonators directly to construct the duplex filtering antenna. The two modes of the dual‐band radiation element function as last stage resonators, improving the selectivity of both the transmitting band and the receiving band, increasing the bandwidths, and enhancing the isolation. A prototype antenna is fabricated and measured. The measured results agree well with the simulated results.

No abstract