A Compact Wi-Fi Dual-Band Antenna with a Loaded Resistor for Routers

A new antenna using a loaded chip resistor is proposed. It achieves a broadened bandwidth while ensuring a good radiation efficiency. The benefit is that the antenna has a small profile of 43 mm
$\times 5$
mm, which is easy to integrate in various small routers. The antenna is printed on an FR4 board and fed through a
$\boldsymbol{50}\Omega$
characteristic impedance microstrip line. It has an impedance bandwidth
$(\vert \mathbf{S}_{11}\vert < -10\mathbf{dB})$
of 2.4G~2.47GHz (Wi-Fi 2.4GHz band) and 5.23G~6.61GHz (Wi-Fi 5GHz band).