High Gain Vivaldi Antenna by MIMO-PBG Technique with configuration ۳-D for Application WiMAX and LF Radars

In this Paper, the Vivaldi antenna has been designed by use of the Multi-Input Multi-Output (MIMO) technique and the technique of creating Photon Band Gap (PBG) substrate in the ۱GHz-۶GHz frequency band, with Rogers.۴۰۰۳ sub-layer materials. The proposed antenna has been analyzed with the purpose of increasing gain. Improvement of the mentioned values increases the value of the transferring/receiving coefficient of signals on the surface of the antenna substrate and, reciprocally, its losses have been decreased, and this improvability is important for signal exchange in telecommunications portable devices. The geometry of substrate structure of proposed antennas is in the form of configuration ۳-D, which has two vertical sub-layers in the form of PBG with cylindrical cavities, which have been configurated in a regular form and an integrated surface on each of the new geometries of Vivaldi antennas; the underlying surface substrate, too, has been designed in Unipolar Compact Photonic Band Gap (UC-PBG) form in unipolar mode. In this geometric structure, the antenna is designed for the creation of signal reciprocity for the improvement of radiation absorption of the substrate surface. Vivaldi antenna has WiMAX notch band frequency and is applicable for low and medium band portable radars in microwave frequency. In the simulation, the antenna gain value of ۱۴.۴۶ dB, return loss parameter of -۵۹.۷ dB, and the signal isolation value of -۷۵.۶۸ dB has been obtained. The simulation has been performed in CST Microwave Studies.

کلیدواژه ها:

Vivaldi ، MIMO ، UC-PBG ، Gain ، S۱۱ ، (dB)