Filtering Dense Dielectric Patch Antenna with a Pair of Step Arc-Shaped Slots

This paper proposes a novel dense dielectric patch antenna (DDPA) with a flltering function, featuring an arc-shaped silver-plated patch. The antenna is composed of a dense dielectric patch (DDP) and a dual-layer PCB. A pair of stepped arc-shaped slots are designed on the DDP, which confines the resonant field region of the TE<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> mode mainly to the area inside the stepped arc-shaped slot. As a result, the TE<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> mode resonant frequency shifts to a higher frequency, forming a passband with the TE<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">12</inf> mode. The arc-shaped part in the middle of the DDP is silver-plated, altering the original electric field distribution and introducing a radiation zero at the lower frequency edge of the passband. By loading parallel crossed stubs onto the microstrip line, the interference in the high-frequency stopband is effectively suppressed. Therefore, this filtering antenna achieves a filtering function without requiring additional filtering circuits. Simulation results indicate that the antenna provides a relative bandwidth of 14.8% within the passband (0.58 GHz, 3.62 GHz∼4.2 GHz) with an average gain of 6.37 dBi.