Multiband Microstrip Antenna for Bluetooth, UWB, X-band and Ku band Applications

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract – A compact microstrip feed multiband monopole antenna for Bluetooth (2.4-2.48 GHz), Ultra Wide Band (UWB) (3.1-10.6GHz), X-band (8-12 GHz) and Ku band (12-18 GHz) applications is suggested. The basic antenna structure consists of a rectangular patch with lower edges beveled on one side and ’V’ shape partial ground having central slot with lower corner intercepted by a rectangular strip place at bottom on the other side of substrate. Also this ground structure is modified by adding a rectangular strip connected to upper corner of ‘V’ shape ground to obtain desired performance. The idea of lower edges beveling is introduced in order to increase the impedance bandwidth. A circular slot is etched on the patch to provide better radiation pattern and impedance bandwidth. This antenna has operating frequency from 2.332.59 GHz and resonates at 2.44 GHz for Bluetooth application and 2.88-20 GHz for UWB, X-band and Ku-band applications with WLAN band notch characteristics. In this paper, the shape of ground is optimized so as to improve impedance bandwidth over entire UWB, X-band and Ku-band range. Also we can see that rectangular quarter wavelength strip inserted in central part of patch is optimized so as to resonate over Bluetooth band. The proposed antenna was simulated using CSTMicrowave Studio. With adjusted parameters the proposed antenna exhibits a broad impedance bandwidth with VSWR ≤ 2.