Multi-Input Multi-Output Compact Antenna with One-Way Circular Polarization for WiMAX 3.5 and ITU-R Applications
Subject Areas : Antenna Design and Application
1 - Department of Electrical Engineering, Miandoab Branch, Islamic Azad University, Miandoab, Iran
Keywords: Antenna, Dual-band, Circular polarization, Multi-Input Multi-Output.,
Abstract :
In this research, a compact multi-layer microstrip antenna for Multiple-Input Multiple-Output (MIMO) systems with dual-band circular polarization capability has been designed, simulated, and fabricated. The antenna structure employs separate coupling networks for each frequency band, each comprising a hairpin resonator, a straight slot, and a U-shaped groove. This configuration enables the establishment of two signal paths with the requisite phase difference to feed the patch. By applying a ±90° phase shift, the antenna achieves dual-band circular polarization operation. The principal innovation of this work is the implementation of a multi-layer feeding network that ensures an axial ratio below 3 dB, achieved through the combined action of the straight slot and U-shaped groove to excite a circular polarization resonance mode. The antenna exhibits right-hand and left-hand circular polarization characteristics in different frequency bands. Simulation and experimental results validate the antenna’s performance, demonstrating impedance bandwidths of 3.0–4.2 GHz and 5.5–6.6 GHz, with near-complete circular polarization coverage across the first band. The gain response increases linearly with frequency, achieving an average value of 5 dB.
- Enhanced System Efficiency Across Dual Frequency Bands.
- Improved Axial Ratio via Novel U-Slot/Straight-Slot Hybrid Feed.
- Compact MIMO Antenna with Dual-Band Circular Polarization.
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