High-Isolation Dual-Band 4 × 4 MIMO Antenna with Compact Size Enabled by Defected Ground and Parasitic Decoupling
26th International Microwave and Radar Conference, MIKON 2026, Krakow, Polonya, 18 - 21 Mayıs 2026, ss.384-390, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Doi Numarası: 10.23919/mikon66970.2026.11577823
- Basıldığı Şehir: Krakow
- Basıldığı Ülke: Polonya
- Sayfa Sayıları: ss.384-390
- Anahtar Kelimeler: 5G networks, defected ground structures, high isolation, MIMO antenna
- Yıldız Teknik Üniversitesi Adresli: Evet
Özet
This paper presents the design and optimization validation of a compact 4 × 4 multiple-input multiple-output (MIMO) antenna system characterized by dual band and high isolation. To meet the increasing demands for high data rates in modern wireless communication, a four-port configuration is developed using microstrip monopole patch with slot elements. To mitigate the mutual coupling inherent in dense MIMO arrays, defected ground structures (DGS), and parasitic elements are strategically integrated, ensuring high port-to-port isolation without increasing the overall size. The proposed 4 × 4 MIMO array is designed on a FR-4 substrate with compact physical dimensions of 6 8 ∼ m m × 6 8 ∼ m m × 3. 5 ∼ m m. Simulation results demonstrate that the antenna operates within the frequency range of 4.8-6.2 GHz, achieving a fractional bandwidth of 2 5. 5%. Key MIMO performance metrics indicate a port isolation better than 2 8 ∼ d B and an Envelope Correlation Coefficient (ECC) lower than 0.08 across the entire operating band, which confirms excellent diversity performance. Furthermore, the antenna exhibits a peak gain of 4.51 dBi and a radiation efficiency exceeding 72 %. The diversity gain (DG) is maintained near the theoretical limit of 6.45 dB. With its combination of compact size, robust isolation, and high-gain characteristics, the proposed 4 boldsymbol× 4 MIMO antenna is a suitable candidate for 5G NR, Wi-Fi 6E.