Design of an UWB antenna with WLAN band notch characteristic

This paper presents an Ultra-Wideband miniaturized antenna with WLAN band notch characteristics, measuring only 22 mm×13 mm×0.8 mm, and achieves UWB operating characteristics of 4.12-18 GHz through optimization of the M-shaped multi-branch coupling slot structure. At 4.52 GHz, 9.68 GHz and 13.16 GHz, the S11 achieves excellent impedance matching performance of -28.5 dB, -37.88 dB and -24.4 dB respectively. Its wideband characteristics can be applied to satellite communications (C-band, 4-8 GHz) and military radar systems (X-band, 8-12 GHz) and space radio communication (Ku band, 12-18 GHz) and other fields. With a specially designed notch function, the antenna achieves active signal suppression in the 5.8 GHz (5.030-5.835 GHz) band where the WLAN operates, effectively avoiding co-frequency interference with the WLAN system. This antenna demonstrates its unique application value in multi-band integrated systems and electromagnetic compatibility scenarios, as well as in scenarios such as IoT devices, medical electronics, avionics systems, satellite relay communication systems, and military equipment that requires covert communication, which need to operate independently in complex electromagnetic environments.