فهرست نشریات علمی دسترسی آزاد ایران

                                                                                                                      Abstract--This paper proposes the design of an antenna array with two closely spaced elements to achieve desired radiation characteristics in the ISM band. First, a microstrip array consisting of two elements that are in front of each other is considered. By varying the length of the current path, the frequency band is moved to 2-6.3 GHz. Furthermore, a parasitic element is placed between two antennas to prevent surface current leakage and reduce mutual coupling to -55 dB. Ultimately, less coupling occurs in the intended band as a result of the proposed structure, which consists of two adjacent meandering antennas with a parasitic element between them.  The simultaneous use of both the current path extension technique and the parasitic element for coupling reduction represents a novel approach to achieving the desired radiation characteristics. According to the HFSS software simulation results, the designed structure exhibits an omnidirectional radiation pattern, a gain of -5.23 dB, and a bandwidth of 6.3 GHz, which falls within the UWB structure classification. To validate the simulation results, the final structure is fabricated on a FR4 substrate with a thickness of 1.6 mm, and dimensions of 50×30×1.6mm3. The measurement results validate the simulation model.