A novel dual band circularly polarised mmWave open circular loop antenna array is proposed. The antenna has been fabricated on a double sided Rogers RT5880 substrate with a double-sided parallel strip line (DSPSL) and mounted in a three layer Polytetrafluoroethylene (PTFE) case. The microstrip array offers an average gain of 13.85 dBi, impedance bandwidths of 4.60% and 3.55% at 30 GHz and 34 GHz respectively, and a CP bandwidth of 10.16%. Close agreement has been achieved between measured and simulated results.
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Merlos-Garza et al. (2024) studied this question.
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