A Six-Octave Wideband and Low Profile Log-Period Monopole Endfire Antenna

This paper proposes a six-octave wideband and low-profile log-period monopole endfire antenna for the flush-mounted applications. 24 monopoles with log-period rule are used to cover 2-12 GHz operating frequency band and those monopoles are printed on both side of a low-loss dielectric layer vertically placed over a wideband microstrip-to-slot line transition. The low-profile is realized by bending some of the long monopoles so the overall antenna size is obtained as 40 mm×100 mm×13.6 mm. The simulated results indicate that the proposed antenna can work at the whole 2-12 GHz band with very good endfire radiation pattern and stable gain performance.