Abstract
Wireless communication systems which require flexibility and reconfigurability in antenna systems faces main problems like antenna performance, size, weight and cost. A wide band Frequency Reconfigurable Rectangular Slotted Self Similar Antenna has been proposed in this paper. The rectangular slotted patch is repeated for two iterations at different scales and is separated by means of Radio Frequency Micro Electro Mechanical Systems (RF MEMS) switches in order to provide reconfigurability. The antenna can operate in three frequency bandsi.e. K-band, Ku-band and Ka-band by altering the states of RF MEMS switches. To avoid fringing effects and to improve antenna performance, quarter wavelength (λ/4) spacing is required between the antenna and the ground plane. However, a Reconfigurable Antenna requires different λ/4 spacing which is difficult to achieve using a common ground plane. So the Frequency Reconfigurable antenna is integrated with high impedance surface (HIS) like Electronic Band Gap (EBG) structures to suppress standing waves and surface waves with a unified profile thickness of 1.75 mm. The overall dimension of the proposed antenna along with RF MEMS Switch, feed element and HIS is about 8 mm × 8 mm × 1.75 mm. The simulated results of the proposed antenna reveal enhancement in antennas performance like Voltage Standing Wave Ratio (VSWR), Front to Back Ratio (FBR) and bandwidth when it is placed over HIS EBG. Also the radiation patterns of the proposed antenna when placed over EBG shows the suppression of side lobe and backward radiation.
Highlights
The tremendous explore in the current antenna research include Frequency Reconfigurable Antennas that haveHow to cite this paper: Anand, S. and Gloria, J.J.P. (2016) Radio Frequency Micro Electro Mechanical Systems (RF MEMS) Based Reconfigurable Rectangular Slotted Self Similar Antenna
The results reveal enhancement in antennas performance like Voltage Standing Wave Ratio (VSWR), Front to Back Ratio (FBR) and bandwidth when it is placed over high impedance surface (HIS) comparatively with the antenna element placed over the ground plane with finite distance and λ/4 spacing. 2.1
The proposed frequency reconfigurable Rectangular Slotted Self Similar Antenna is integrated with High Impedance Surface for better performance and low profile design
Summary
How to cite this paper: Anand, S. and Gloria, J.J.P. (2016) RF MEMS Based Reconfigurable Rectangular Slotted Self Similar Antenna. The application of varactor diodes in antennas has continuous frequency tuning ability and simplified circuit complexity It has the disadvantages like low dynamic range, high power loss and nonlinearity [17]-[20]. In Frequency Reconfigurable Antennas the configuration requires different quarter wavelength spacing to achieve different operating frequency bands which are difficult to be achieved using a single ground plane reflector. To overcome this problem the High Impedance Surface (HIS) like Electronic Band Gap (EBG) can be used which has unique characteristics like surface and standing wave suppression and in-phase reflection phase characteristics. The simulated results reveal that when the ground plane is replaced by EBG structure, there is tremendous improvement in antenna performance like bandwidth, VSWR, FBR and return loss along with size compaction
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