SUPPRESSION OF CROSS-POLARIZATION AND MUTUAL COUPLING BETWEEN DUAL TRACE DUAL COLUMN COAXIAL MICROSTRIP ARRAY USING DUMBBELL-SHAPED RESONATOR

摘要

A compact two-channel dual trace dual column (DTDC) printed microstrip antenna array integrated with dumbbell-shaped resonator (DSR) is presented. The DSR has been integrated with DTDC array for the reduction of mutual coupling and suppression of cross-polarization (XP) level at 5.2 GHz. In this work, an omnidirectional microstrip antenna array (OMAA) is designed with five elements and then two numbers of similar arrays have been used for multiple-input multiple-output (MIMO) application. A DSR placed in between two OMAA separated by 0.54λ suppressed 12 dB mutual coupling and 7.5 dB XP level. The mutual coupling has been studied by placing DSR on the upper trace first and then in the lower trace. The mutual coupling of 11 dB is reduced when DSR is placed on the upper trace and 12 dB when it is in the lower trace of the array structure. The DTDC antenna structure exhibits maximum XP suppression when DSR in the lower trace. The antenna with compact structure based on the design has a peak gain of 12.84 dBi and band width of 250 MHz.