Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Ramadhan, Mohammed"'
Publikováno v:
Journal of Telecommunications and Information Technology, Vol 1, Iss 1 (2024)
Fractal antennas are mainly used in multiband applications. However, these types of arrays suffer from numerous disadvantages, such as high sidelobe levels, low directivity, poor taper efficiency, and high design computational complexity. In this pap
Externí odkaz:
https://doaj.org/article/fcd95f4e7774409d9f7de52db21a8d5f
Autor:
Jafar Ramadhan Mohammed
Publikováno v:
Journal of Telecommunications and Information Technology, Vol 4, Iss 4 (2023)
Conventionally, non-uniformly excited antenna arrays are synthesized by independently determining the excitation amplitude and phase of each single element. Such an approach is considered to be the most expensive and complex design method available.
Externí odkaz:
https://doaj.org/article/c5b41eea7ff04bbfa95e9d8c9773113e
Publikováno v:
Journal of Telecommunications and Information Technology, Iss 1 (2023)
In this paper, two different architectures based on completely and sectionally clustered arrays are proposed to improve the array patterns. In the wholly clustered arrays, all elements of the ordinary array are divided into multiple unequal ascending
Externí odkaz:
https://doaj.org/article/aca048e0994f459c935ecc7826cebe24
Autor:
Alzaid, Mohammad, Ramadhan, Mohammed, Abul, Ahmad, Karam, Mohammad, Alsaif, Abdulmalik, Stapleton, Emma
Publikováno v:
Journal of Laryngology & Otology; Sep2024, Vol. 138 Issue 9, p906-912, 7p
Publikováno v:
Journal of Telecommunications and Information Technology, Iss 3 (2022)
A monopulse searching and tracking radar antenna array with a large number of radiating elements requires a simple and efficient design of the feeding network. In this paper, an effective and versatile method for jointly optimizing the sum and differ
Externí odkaz:
https://doaj.org/article/e523d0a5c01c489e8709c82666e54c60
Publikováno v:
Journal of Telecommunications and Information Technology, Iss 3 (2021)
An optimization method based on compressed sensing is proposed for uniformly excited linear or planar antenna arrays to perturb excitation of the minimum number of array elements in such a way that the required number of nulls is obtained. First, the
Externí odkaz:
https://doaj.org/article/fb58c5982c9d48488523fe260b74142e
Publikováno v:
IEEE Access, Vol 7, Pp 10057-10076 (2019)
This paper presents a novel four-pole system for line-commutated converter high-voltage direct current transmission with a quad 12-pulse operation. This system aims to eliminate a ground electrode or metallic return and increase the reliability and d
Externí odkaz:
https://doaj.org/article/af2dc125222545be92312a55fd6f01f0
Publikováno v:
IEEE Access, Vol 7, Pp 145532-145545 (2019)
Back-to-back high-voltage direct current systems are used to transfer electrical power between two asynchronous AC systems. The existing bi-pole back-to-back system (2PBTBS) can be converted into the four-pole back-to-back system (4PBTBS) to save in
Externí odkaz:
https://doaj.org/article/ee5f21bed4ff45009006586cdcb3e1ee
Autor:
Jafar Ramadhan Mohammed
Publikováno v:
Journal of Telecommunications and Information Technology, Iss 1 (2021)
Regular fully filled antenna arrays have been widely used in direction of arrival (DOA) estimation. However, practical implementation of these arrays is rather complex and their resolutions are limited to the beamwidth of the array pattern. Therefore
Externí odkaz:
https://doaj.org/article/d74bb8528b214d54aaceaadcf6c8978c
Publikováno v:
مجلة المختار للعلوم, Vol 35, Iss 4 (2020)
The normal mode analysis method was used to study the effect of both the initial stress and the magnetic field on a thermally elastic body. This method is used to obtain the exact expressions for the considered variables. Some particular cases are al
Externí odkaz:
https://doaj.org/article/a11c01cd6e16494582d98702d45f9014