Reduced mutual coupling of compact MIMO antenna designed for WLAN and WiMAX applications

Self Cite

This communication presents a compact wide band wearable MIMO antenna with very low mutual coupling (VLMC). The proposed antenna is composed of Jeans material. Two “I” shaped stubs are connected in series and are employed on the ground plane between the two patches separated by 0.048 λ to increase isolation characteristics of the antenna‐port. The antenna covers frequency spectrum from 1.83 GHz to 8 GHz (about 125.5%) where the minimum port isolation of about 22 dB at 2.4 GHz and maximum of about 53 dB at 5.92 GHz are obtained. The envelope correlation coefficient (ECC) of the MIMO antenna is obtained to be less than 0.01 with a higher diversity gain (DG > 9.6) throughout the whole operating band. The proposed MIMO antenna is cost effective and works over a wide frequency band of WLAN (2.4‐2.484 GHz/5.15‐5.35 GHz/5.72‐5.825 GHz), WiMAX (3.2‐3.85 GHz) and C‐band downlink‐uplink (3.7‐4.2 GHz/5.925‐6.425 GHz) applications. Simulation results are in well agreement with the measurement results.

Section: Results With Explanationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A compact wide band textile MIMO antenna with very low mutual coupling for wearable applications

Biswas

Chakraborty

2019

Self Cite

“…The functionality of a MIMO antenna system is usually considered by using the envelope‐correlation factor, which is often derived from the mutual impedance between the antenna elements, far‐field patterns, or directly from scattering parameters . Low correlation and high isolation are essential for better performance.…”

Section: Mutual Coupling Reduction Measurements and Discussionmentioning

confidence: 99%

Isolation enhancement of rectangular dielectric resonator antennas using wideband double slit complementary split ring resonators

Rezapour

Rashed-Mohassel

Keshtkar

et al. 2019

A wideband epsilon-negative structure is employed as one-layer and two-layer isolators to reduce mutual coupling in multiple-input multiple-output systems composed of two E-coupled rectangular dielectric resonator antennas. The proposed unit cell with −15 dB bandwidth for S 21 extending from 1970 to 3317 MHz, is a double slit complementary split ring resonator etched on the ground plane of a stripline. Each layer is composed of a 2 × 3 array of the suggested unit cell. Reduction in isolation of more than 11 dB for the one-layer case and higher than 20 dB for the two-layer case are measured within the frequency range of 2.604 to 2.64 GHz which includes WiMAX. The highest isolation level of 36 dB is realized at 2.868 GHz. The impedance matching, gain, radiation efficiency, and envelope correlation are improved compared to the original case. A prototype is designed, fabricated, and tested. Simulation data and measurement results are in good agreement.

“…One of the significant design considerations in MIMO antenna is its elemental positioning architecture. This determines the compactness of the MIMO system . Port isolation is directly related to the gap between the antenna elements where a large gap reduces mutual coupling but disturb the compactness.…”

Section: Introductionmentioning

confidence: 99%

“…This determines the compactness of the MIMO system. 20 Port isolation is directly related to the gap between the antenna elements where a large gap reduces mutual coupling but disturb the compactness. If port isolation is not satisfactory, then different decoupling arrangements are integrated into the compact MIMO antenna system.…”

Section: Introductionmentioning

confidence: 99%

Complementary meander‐line‐inspired dielectric resonator multiple‐input‐multiple‐output antenna for dual‐band applications

Biswas

Chakraborty

2019

Self Cite

The communication presents a simple dielectric resonator (DR) multiple‐input‐multiple‐output (MIMO) dual‐band antenna. It utilizes two “I”‐shaped DR elements to construct an “I”‐shaped DR array antenna (IDRAA) for MIMO applications. The ground plane of the antenna is defected by two spiral complementary meander lines and two circular ground slots. In the configuration, two “I”‐shaped DR elements are placed with a separation of 0.098λ. The antenna covers dual‐band frequency spectra from 3.46 to 5.37 GHz (43.26%) and from 5.89 to 6.49 GHz (9.7%). It ensures the C‐band downlink (3.7‐4.2 GHz), uplink (5.925‐6.425 GHz), and WiMAX (5.15‐5.35 GHz) frequency bands. Each DR element is excited with a 50‐Ω microstrip line feed with aperture‐coupling mechanism. The antenna offers very high port isolation of around 18.5 and 20 dB in the lower band and upper band, respectively. The proposed structure is suitable to operate in the MIMO system because of its very nominal envelope correlation coefficient (<0.015) and high diversity gain (>9.8). The MIMO antenna provides very good mean effective gain value (±0.35 dB) and low channel capacity loss (<0.35 bit/s/Hz) throughout the entire operating bands. Simulated and measured results are in good agreement and they approve the suitability of the proposed IDRAA for C‐band uplink and downlink applications and WiMAX band applications.