The substrate performances for integrated circuit and micromachined antenna are quite different in which the former requires high dielectric constant

but the latter doesn′t. Therefore it′s difficult to integrate circuits with microstrip antenna. To meet the needs of miniaturized Bluetooth devices

the paper presents a cavity shorted microstrip antenna manufactured by micromachining process. The 10dB bandwidth and efficiency of the micromachined Bluetooth antenna are more than 10% and 67%

respectively

and the length is only 1/6 wavelength. The antenna is suitable for Bluetooth devices.