New dual-frequency microstrip antennas for wireless communication

The investigations on two new short-circuited microstrip patch antennas, which are able to radiate dual frequencies at GPS and Bluetooth frequency bands, are reported. One of these antennas is combination of two square patch sections and the other is combination of two circular patch sections, both of which are grounded by shorted pins. Using these antennas, by properly choosing the positions of shorted pins, good impedance matching can be obtained at both the frequencies. The dual frequency natures of the shorted patchs, theoretically obtained using IE3D software, are verified by measurement.