Examinando por Autor "Konditi, D. B. O."

Mostrando 1 - 2 de 2
  • Miniatura
    Ítem
    A compact dual-band Dolly-shaped antenna with parasitic elements for automotive radar and 5G applications
    (Heliyon, 2021) Bamy, C. L.; Moukanda Mbango, F.; Konditi, D. B. O.; Moukala Mpele, P.
    In this paper, a compact dual-band Dolly-shaped antenna (DBDSA), resonating at 23.52 GHz and 28.39 GHz, is proposed for automotive radar, 5G, and Industrial, Scientific, and Medical (ISM) applications. The antenna is designed on a 7 � 7 � 1.28 mm(3) which is 0.541?(0)�0.541?(0)�0.099?(0) in electric size, where ?(0) represents the free space wavelength at 23.16 GHz. Rogers RO3010 substrate with a dielectric constant of 10.2 and a loss tangent is about 0.0022 has been used. Two F-shaped parasitic elements and a rectangular slot have been used to achieve the desired electromagnetic antenna performances. After modeling and optimizing the proposed antenna configuration through High-Frequency Structure Simulator (HFSS) software, its prototype was manufactured and measured to validate the simulated results. The DBDSA achieves an overall radiation efficiency of 80% within the two operating frequency bands. The radar band exhibits a stable gain of 5.51 dBi, while the 5G band has a gain of 4.55 dBi. Furthermore, the experimental results show that the |S(11)|?-10 dB bandwidths are 1.16 GHz (23.16 GHz-24.32 GHz) in the lower band and 634 MHz (28.078 GHz-28.712 GHz), respectively. A good agreement is found between the simulated and measured results.
  • Miniatura
    Ítem
    Evaluation of adjacent channel interference from land-earth station in motion to 5G radio access network in the Ka-frequency band
    (Heliyon, 2021) Barrie, S.; Konditi, D. B. O.
    As the fifth-generation (5G) mobile communication service is expected to operate in one of the 11 candidate frequency bands of 24.25-27.5 GHz, compatibility and coexistence with other adjacent wireless applications must be evaluated. In this paper, the adjacent channel interference (ACI) between Land-Earth Station in Motion (L-ESIM), 5G base station (BS), and user equipment (UE) operating in the adjacent frequency bands is assessed. The minimum coupling loss (MCL) method is used by considering the worst-case scenario to evaluate the effect of geostationary orbit-fixed satellite service's (GSO-FSS) frequency band of 27.5-29.5 GHz on the 5G radio access network (BS and UE) from L-ESIM. From the numerical simulations, minimum separation distances of 35 km and 12 km were recorded for the BS and UE to meet the maximum acceptable interference of -147 dBW/MHz. The obtained results will protect the 5G RAN from harmful interference by ensuring adjacent channel compatibility and coexistence with L-ESIM in their future deployment.