Planar Substrate-Integrated Endfire Antenna With Wide Beamwidth for Q-Band Applications

According to the IEEE 802.11aj (45 GHz) standard, a millimeter-wave planar substrate-integrated endfire antenna with wide beamwidths in both E-and H-planes, and good impedance matching over 42.3-48.4 GHz is proposed for the Q-band wireless local area network (WLAN) system. The proposed antenna comprises a printed angled dipole with bilateral symmetrical directors for generating wide-angle radiation, and the beamwidth in both Eand H-planes can be easily adjusted. The antenna is prototyped using the conventional printed circuit board process with a size of 6 × 26 × 0.508 mm
³
, and achieves beamwidths greater than 120° in two main planes, S
₁₁
of less than -12.5 dB, and peak gain of 3.67-5.2 dBi over 42.3-48.4 GHz. The measurements are in good agreement with simulations, which shows that the proposed antenna is very promising for Q-band millimeter-wave WLAN system access-point applications.