A Wideband Filtering Antenna With Sharp Roll‐Off Using Parasitic Patch and Artificial Magnetic Conductor for Enhanced Bandwidth

ABSTRACT A novel wideband filtering antenna integrating a 2 × 5 rectangular parasitic array and artificial magnetic conductor (AMC) is proposed in this letter. The antenna structure comprises a radiation patch loaded with two L‐shaped strips, a parasitic patch positioned directly beneath the radiation patch, a 2 × 5 rectangular parasitic array symmetrically distributed on the top substrate, and an AMC on the bottom substrate. The antenna is fed through feed lines and metal vias. The introduction of L‐shaped strips on both sides of the rectangular radiation patch creates a radiation null at the edge of the low‐frequency band, while T‐shaped strips and rectangular gaps on the patch enhance impedance matching. Additionally, a parasitic patch composed of triangular and trapezoidal elements is placed below the radiation patch to generate a radiation null at the high‐frequency band edge. The AMC structure extends the antenna's impedance bandwidth in the high‐frequency range, while the 2 × 5 rectangular parasitic array further broadens the bandwidth in the low‐frequency range. Experimental results demonstrate a −10 dB impedance bandwidth of 30.8%, a peak gain of 6.5 dBi, and an average gain of 6.3 dBi, with stable in‐band performance. To validate the design, the antenna is fabricated and measured.