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Design of a Compact Multiband Monopole Antenna with MIMO Mutual Coupling Reduction
Chang-Keng Lin1, Ding-Bing Lin1, Han-Chang Lin1
1Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
Sensors (Basel, Switzerland)
|September 14, 2024
Summary
Researchers designed a compact multiband antenna for Wi-Fi and sub-6G bands. Meander slits on the ground structure effectively reduced mutual coupling, enhancing performance for IoT and Wi-Fi systems.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Antenna Theory
Background:
- Modern wireless communication systems require compact antennas capable of operating across multiple frequency bands, including Wi-Fi and sub-6 GHz.
- Mutual coupling between antenna elements in multi-antenna systems degrades overall performance, necessitating effective suppression techniques.
Purpose of the Study:
- To design and validate a compact multiband monopole antenna for Wi-Fi (2.4 GHz) and sub-6 GHz (3.5 GHz, 5-6 GHz) bands.
- To investigate and demonstrate a novel method for reducing mutual coupling between antenna elements using defected ground structures (DGS).
Main Methods:
- A compact multiband monopole antenna with dimensions 30 × 10 × 1.6 mm³ was designed.
- Two meander slits were introduced on the common ground, acting as a DGS, to suppress mutual coupling between antenna elements.
- Simulations and measurements were performed to evaluate antenna performance, including isolation and multiband characteristics.
Main Results:
- The proposed antenna operates effectively across the targeted 2.4 GHz, 3.5 GHz, and 5-6 GHz bands.
- Mutual coupling was significantly suppressed from -6.5 dB and -9 dB to -26 dB and -13 dB at 2.46 GHz and 3.47 GHz, respectively.
- Simulated and measured results showed good agreement, confirming improved isolation and overall multiple-input multiple-output (MIMO) antenna system performance.
Conclusions:
- A compact multiband monopole antenna with excellent performance across Wi-Fi and sub-6 GHz bands has been successfully designed.
- The meander-slit DGS approach provides an effective solution for mutual coupling suppression in multiband antenna systems.
- The developed antenna is suitable for integration into Internet of Things (IoT) devices and Wi-Fi infrastructure, enhancing wireless connectivity.
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