Design of a Symmetric Quad Circular Radiator Antenna with Semi-Circular Bridge and DGS for WLAN, ISM Band & Sub-6 GHz Applications
📅 Published: 12 May 2026
I’m excited to share our latest work on a compact multiband antenna designed to support modern wireless systems, including WLAN, ISM band, and Sub-6 GHz applications.
📐 Antenna footprint: 50 × 50 × 1.6 mm³
The proposed design integrates symmetric quad circular radiators with a semicircular bridge and a Defected Ground Structure (DGS). This unique configuration delivers enhanced impedance matching and efficient multiband operation—without the need for complex isolation structures.
🔍 Research Highlights
Compact multiband antenna for WLAN, ISM, and Sub-6 GHz
Novel combination: semicircular bridge coupling + DGS
Stable radiation characteristics with strong MIMO diversity performance
No complex isolation structures required
📊 Key Performance Results
Operating Bands:
2.24–2.94 GHz
3.84–3.98 GHz
4.92–5.06 GHz
Resonant Frequencies (Return Loss):
2.44 GHz (−40.3 dB)
2.86 GHz (−17.9 dB)
3.92 GHz (−14.9 dB)
4.98 GHz (−10.6 dB)
Achievements:
Realized Gain > 5 dB
ECC < 0.1
Diversity Gain ≈ 10 dB
CCL < 0.6 bits/s/Hz
Radiation Efficiency up to 86%
🔧 Key Techniques:
Slotted circular radiators
Semicircular bridge coupling
Semicircular DGS
This antenna offers a practical, high-performance solution for next-generation WLAN, IoT, and Sub-6 GHz wireless communication systems.
👇 I’d love to hear your thoughts or connect if you're working in antenna design, RF engineering, or wireless communications.
#AntennaDesign #MIMO #Sub6GHz #WLAN #ISM #WirelessCommunication #RFEngineering #Research