A monopolar patch antenna with a V-shaped slot for Car-to-Car (C2C) and WLAN communications is presented in this paper. To widen the impedance bandwidth of the antenna, techniques of adding shorting pin and a V-shaped slot are applied to an equilateral triangular patch. By properly placing the shorting pins on an equilateral triangular patch, two operating modes, TM 10 and TM 20 , are obtained. The presence of the V-shaped slot can generate an additional TM 11 mode. These three resonances found in the operating frequency bandwidth resulted in a wideband characteristic. The proposed antenna can operate from 4.82 to 6.67 GHz for the reflection coefficient  -10 dB with the gain of around 5.0 dBi. In addition, an omnidirectional radiation pattern is yielded by a coaxial centred-fed probe excitation. The antenna has a thickness of 0.09 g (at the centre frequency of 5.5 GHz), which is easily hidden on the roof of a vehicle for C2C communication. This proposed design can also be used as indoor base station antennas for WLAN communication.

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