Abstract:Abstract-Decoupling networks (DNs) have frequently been used to obtain high isolation performance between coupled antennas in multiple-input multiple-output (MIMO) systems due to their advantage of spatial efficiency, which is particularly important for mobile devices. However, conventional DNs suffer from narrowband limitations. In this paper, a broadband decoupling technique is proposed that broadens the isolation bandwidth using a parallel resonant point. A 1.95 GHz MIMO antenna system with 460 MHz of bandw… Show more
“…Ultimately, a prototype of CP-MIMO-SR array antenna was realized and measured to validate the design procedure and simulation results. The operating frequency band for a return loss of −10 dB was 3.5–8.2 GHz at port 1 and 3.3–8.3 GHz at port 2 that were greatly improved compared with other previous published designs [1–5] and [15–18]. Fig.…”
Section: Introductionmentioning
confidence: 67%
“…It is clear that the operating bandwidth of Ant. 2 completely covers WiMAX (IEEE 802.16) and C-band, which are broader than AR and the impedance bandwidths reported in [1–5]. The measured results of ARBWs for Ant.…”
Section: Measured Resultsmentioning
confidence: 92%
“…Multiple-input multiple-output (MIMO) antenna arrays are employed in the new generation communication systems, radars, and remote-sensing devices due to their specifications and advantages, such as reducing multipath fading, increasing transmission capacity, light weight, and ease of realization [1–5]. In the wireless telecommunication, multipath fading is an important problem when the signals with various phases and amplitudes are composed subversively in the receiver.…”
Wide-band circularly polarized multi-input multi-output (MIMO) antenna array with a 2 × 4 feed network was proposed for C-band application. Different unique techniques were utilized in the proposed array to enhance the antenna characteristics, such as gain, 3 dB axial ratio bandwidth (ARBW), impedance tuning, and ruinous mutual coupling effects. A miniaturized dual-feed Tai chi-shaped antenna element with a pair of feeding points and a pair of eyebrow-shaped strips was presented for enhancing circular polarization (CP) purity and impedance matching. For a better improvement of CP features, a 2*4 MIMO sequentially rotated (MIMO-SR) feed network was used to achieve broader 3 dB ARBW. Besides, the MIMO feature of the feed network could control the left- and right-handed CP, respectively. Ultimately, specific forms of slot and slit structures were applied onto the top layer of MIMO feed network that provided a high isolation between the radiating elements and array network. Furthermore, the diversity gain (DG) was studied. The extracted measured results illustrated an impedance bandwidth of 3.5–8.2 GHz at port 1 and 3.5–8.3 GHz at port 2 for VWSR < 2 and 3 dB ARBW of 4.6–7.6 GHz at port 1 and 4.6–7.5 GHz at port 2. The peak gain of 9.9 dBi was at 6 GHz.
“…Ultimately, a prototype of CP-MIMO-SR array antenna was realized and measured to validate the design procedure and simulation results. The operating frequency band for a return loss of −10 dB was 3.5–8.2 GHz at port 1 and 3.3–8.3 GHz at port 2 that were greatly improved compared with other previous published designs [1–5] and [15–18]. Fig.…”
Section: Introductionmentioning
confidence: 67%
“…It is clear that the operating bandwidth of Ant. 2 completely covers WiMAX (IEEE 802.16) and C-band, which are broader than AR and the impedance bandwidths reported in [1–5]. The measured results of ARBWs for Ant.…”
Section: Measured Resultsmentioning
confidence: 92%
“…Multiple-input multiple-output (MIMO) antenna arrays are employed in the new generation communication systems, radars, and remote-sensing devices due to their specifications and advantages, such as reducing multipath fading, increasing transmission capacity, light weight, and ease of realization [1–5]. In the wireless telecommunication, multipath fading is an important problem when the signals with various phases and amplitudes are composed subversively in the receiver.…”
Wide-band circularly polarized multi-input multi-output (MIMO) antenna array with a 2 × 4 feed network was proposed for C-band application. Different unique techniques were utilized in the proposed array to enhance the antenna characteristics, such as gain, 3 dB axial ratio bandwidth (ARBW), impedance tuning, and ruinous mutual coupling effects. A miniaturized dual-feed Tai chi-shaped antenna element with a pair of feeding points and a pair of eyebrow-shaped strips was presented for enhancing circular polarization (CP) purity and impedance matching. For a better improvement of CP features, a 2*4 MIMO sequentially rotated (MIMO-SR) feed network was used to achieve broader 3 dB ARBW. Besides, the MIMO feature of the feed network could control the left- and right-handed CP, respectively. Ultimately, specific forms of slot and slit structures were applied onto the top layer of MIMO feed network that provided a high isolation between the radiating elements and array network. Furthermore, the diversity gain (DG) was studied. The extracted measured results illustrated an impedance bandwidth of 3.5–8.2 GHz at port 1 and 3.5–8.3 GHz at port 2 for VWSR < 2 and 3 dB ARBW of 4.6–7.6 GHz at port 1 and 4.6–7.5 GHz at port 2. The peak gain of 9.9 dBi was at 6 GHz.
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