2021/1

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WB Notch Anxtennas in MIMO System with High Isolation Performance
(Společnost pro radioelektronické inženýrství, 2021-04) Nazif, Donya Z.; Mohamed, Ibrahim S.; Gaafar, Abdelhamid A.; Abdalla, Mahmoud A.
This article presents a detailed analysis and design of an ultra-wideband (3.1 GHz – 10.6 GHz) notch antennas in a two-element MIMO system with high isolation performance. The wideband spectrum is notched at the WiMAX band at 5.8 GHz centre frequency using a highly selective electromagnetic bandgap structure coupled to the antenna feeding lines. An array of electromagnetic bandgap structure is used to achieve wideband isolation between the two elements. The two antenna elements achieve wideband reflection coefficient for good matching below -10 dB, except the notch where it becomes higher than – 2 dB. On the other hand, the antenna elements have a minimum of 20 dB isolation. Thanks to the achieved results, the antenna MIMO elements have small envelop correlation (less than 0.05) and also small channel capacity loss (less than 0.2 bit/s/Hz). The obtained results are verified using experimental measurements and all circuit/ EM needed simulations.
A Compact Bow-tie Shaped Wide-band Microstrip Patch Antenna for Future 5G Communication Networks
(Společnost pro radioelektronické inženýrství, 2021-04) Patanvariya, Deven G.; Chatterjee, Anirban
In this paper, a novel compact bow-tie shaped microstrip patch antenna for wide-band application is presented. The proposed geometry consists of a modified bow-tie structure at the top of the Rogers RT-5880 substrate with a 50 Ω feed-line and 8 × 8 mm2 full ground plane. The diagonal slots inside the geometry have been implemented for exact resonating. The circuit analysis and various parametric analyses of the proposed geometry have been studied. The prototype of the antenna resonates at 27.77 GHz. The antenna has a fractional bandwidth of 6.77% (26.81–28.69 GHz) in simulation and 6.30% (26.89–28.64 GHz) in measurement respectively. The measured linear gain and radiation efficiency of the antenna are 7.00 dBi and 74% respectively. Also, it has a low sidelobe-level and cross-polarization level over the entire-space. The proposed wide-band antenna gives good time-domain characteristics as well as provides an acceptable FBR and impedance matching over the resonating band. All the properties suggest that the proposed antenna suits well for 5G communication along with various wireless systems.
Cylindrical Dielectric Resonator Antenna Offering Low Cross-Polarization for Point-to-Point Communication Systems
(Společnost pro radioelektronické inženýrství, 2021-04) Reddy, P. Soni; Mondal, Rahul; Sarkar, Partha Pratim
In this paper, a cylindrical dielectric resonator antenna (CDRA) offering low cross-polarization (XP) for point-to-point communication systems is presented. Three linear arrays of air vias (LAAV) are incorporated along the H-plane of a conventionalCDRAin order toweaken the undesired XP generating fields due to the orthogonally resonating HEM21X mode. A set of parametric studies are conducted on the design parameters of the 3-LAAV in CDRA to understand the sensitivity of boresight XPD on the 3-LAAV design parameters. Field distributions in CDRA before and after the incorporation of LAAV are extensively studied to draw a conclusive inference. The 3-LAAV loaded CDRA offers 39 dB higher boresight XP suppression in comparison to the conventional CDRA. The proposed technique is experimentally validated. The measured result shows an XP isolation of 56 dB at the boresight, 55 dB and 38 dB over ±15 % of half-power beamwidth (HPBW) in the E-plane and H-plane of radiation, respectively. This result is well above the minimum cross-polarization discrimination (XPD) requirements for the satellite earth station antennas.
Single-fed Patch Antenna with Reconfigurable Orbit Angular Momentum Order
(Společnost pro radioelektronické inženýrství, 2021-04) Zhang, Liangcai; Jiang, Jianbo; Liu, Yongcong; Li, Weiwen
Order reconfiguration of orbital angular momentum (OAM) is the foundation for wireless communications based on OAM state multiplexing. As the symmetry of a circular patch is disturbed by an arc segment, two degenerate modes can be synthesized under the single-fed condition to generate OAM waves. Due to arc segment independent of the radiation patch, its effective length is controlled by a switching diode to select different order degenerate modes for synthesis. Based on this idea, a reconfiguration of first-order and second-order OAM modes is achieved. In comparison, the performance of low-order OAM mode is better than that of high-order mode.
Planar Hexagonal Antenna with Dual Reconfigurable Notched Bands for Wireless Communication Devices
(Společnost pro radioelektronické inženýrství, 2021-04) Ayadi, Houda; Machac, Jan; Beldi, Sabri; Latrach, Lassaad
In this paper, a planar hexagonal antenna with dual tunable notched band using varactor diodes is presented. The designed antenna operates in the frequency range of 2 GHz to 8 GHz and is loaded by a complementary split ring resonator (CSRR) to achieve the notch-band characteristics. The CSRR produced two stop-bands at the frequencies 3 GHz and 6.8 GHz. In order to obtain the reconfigurability, one varactor diode was used on each ring of the CSRR. The variation of the DC bias of the diodes produced double notched bands yielding a tunable coverage in the 0.6 GHz and 1.6 GHz ranges. The continuous agility and the wide tuning range of the notched bands are the major advantages of this structure. The antenna prototype was manufactured and a good agreement has been achieved between the measured and simulated results. The proposed antenna can be a good candidate for wireless applications that cover the UMTS, the Wi-Fi and the WiMAX bands.

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