Wyniki wyszukiwania - BazTech

1

Design linear array antenna for cellular system

Kanaan Amenah E, Saba F. Ahmed Jaf

Przegląd Elektrotechniczny

|

2023

|

R. 99, nr 4

94--97

EN

In this study, a linear array of antenna arrays, including beam scanning, lateral global connections, element designs, and bars, was developed using an antenna toolbox, guidance, and analysis on a 9-cell linear array of half-way wavelength dipoles. It aims to display a linear array model at the angle and central element patterns at the design frequency for 3D and 2D elements. For this study, the resonant dipole will be allocated to a single linear array radiator by selecting a frequency of 1,8 GHz for the design. Disposition at the resonance frequency of isolated dipole tuning. To provide the other parts with a reference impedance for the patterns, every component spirals independently. The effect of the phenomenon should not be determined by the excitement of others but should also be supported by the development of currents for each item in the array. The standardized central element pattern was monitored using standardized 9-dipole linear width management.

PL

W tym badaniu opracowano liniowy układ układów anten, w tym skanowanie wiązki, boczne połączenia globalne, projekty elementów i pręty, przy użyciu zestawu narzędzi antenowych, wskazówek i analizy na 9-komorowym układzie liniowym dipoli o połowie długości fali. Ma na celu wyświetlenie liniowego modelu szyku pod kątem i wzorców elementów centralnych z częstotliwością projektową dla elementów 3D i 2D. W tym badaniu dipol rezonansowy zostanie przydzielony do pojedynczego promiennika liniowego, wybierając częstotliwość 1,8 GHz do projektu. Dyspozycja przy częstotliwości rezonansowej izolowanego strojenia dipolowego. Aby zapewnić pozostałym częściom impedancję odniesienia dla wzorów, każdy element kręci się spiralnie niezależnie. Efekt zjawiska nie powinien być determinowany przez podniecenie innych, ale powinien być również wspierany przez rozwój prądów dla każdego elementu w szyku. Standaryzowany wzór elementu centralnego monitorowano przy użyciu znormalizowanego 9-dipolowego zarządzania szerokością liniową.

2

Continuous Head-related Transfer Function Representation Based on Hyperspherical Harmonics

Szwajcowski Adam

Archives of Acoustics

|

2023

|

Vol. 48, No. 1

127--139

EN

Expressing head-related transfer functions (HRTFs) in the spherical harmonic (SH) domain has been thoroughly studied as a method of obtaining continuity over space. However, HRTFs are functions not only of direction but also of frequency. This paper presents an extension of the SH-based method, utilizing hyperspherical harmonics (HSHs) to obtain an HRTF representation that is continuous over both space and frequency. The application of the HSH approximation results in a relatively small set of coefficients which can be decoded into HRTF values at any direction and frequency. The paper discusses results obtained by applying the method to magnitude spectra extracted from exemplary HRTF measurements. The HRTF representations based on SHs and HSHs exhibit similar reproduction accuracy, with the latter one featuring continuity over both space and frequency and requiring much lower number of coefficients. The developed HSH-based continuous functional model can serve multiple purposes, such as interpolation, compression or parametrization for machine-learning applications.

3

Design and Simulation of 2× 2Micro Strip Circular Patch Antenna Array at 28 GHz for 5G Mobile Station Application

Hasan Salim Abdullah, Ahmed Abdulsattar Mohamed, Abdulqader Mohanad Nawfal, Dawood Younis Shareef

International Journal of Electronics and Telecommunications

|

2022

|

Vol. 68. No. 4

721-–729

EN

This paper proposes the design and simulation of 2×2 circular patch antenna array working at 28 GHz by using four inset feed micro strip circular patch antennas to achieve beam forming with directivity around 13dB which is required to overcome part of high path loss challenge for high data rate mm-5G mobile station application. Four element 2x2 array consists of two 1x2 circular patch antenna arrays based on power divider and quarter wavelength transition lines as a matching circuit. The designed antenna array is simulated on RT/duroid 5880 dielectric substrate with properties of 0.5mm thickness, dielectric constant ε r =2.2, and tangent loss of 0.0009 by using Computer System Technology (CST) software. The performances in terms of return loss, 3D–radiation pattern is evaluated at 28 GHz frequency band. The design also includes the possibility of inserting four identical 2x2 antenna arrays at four edges of mobile station substrate to achieve broad space coverage by steering the beams of the mobile station arrays.

4

Design and Performance Analysis of a Tripleband Rectangular Slot Microstrip Patch Antenna for Wi-Fi, Wi-MAX and Satellite Applications

Hossain Md. Biplop, Hossain Md. Faruque

International Journal of Electronics and Telecommunications

|

2022

|

Vol. 68, No. 2

217--222

EN

A triple-band microstrip patch antenna is presented in this article with detail investigation of its working mechanism and performance characteristics. The antenna consists of a rectangular slot on the patch to achieve multiband operation. Three distinct frequencies of 2.4 GHz, 5.5 GHz and 7.5 GHz are achieved with return losses of 27 dB, 29 dB and 29 dB respectively. The Impedance Bandwidths are 70 MHz (2.52 GHz-2.44 GHz) at 2.4 GHz, 220 MHz (5.65 GHz-5.43 GHz) at 5.5 GHz and 250 MHz (7.57 GHz-7.32 GHz) at 7.5 GHz, which satisfy the requirements of Wi-Fi, Wi-MAX and satellite communications bands. The fabricated prototype of the antenna has total dimension of 53×53×1.6 mm³ over FR4 substrate. The antenna is simple and has sensible radiation characteristics with considerable gain. This work also focuses on developing a Link Budget model for its application in satellite communication. Most notably, it examines overall system efficiency and optimum path loss, distance analysis, system noise temperature, signal to noise power ratio, the size of antenna and the overall customer satisfactions. The highest gain of the antenna is achieved as 3.5 dB in the band (5.65 GHz-5.43 GHz), while the highest directivity and bandwidth are found as 8.7 dBi and 250 MHz respectively in the higher operating band. The affordable agreement between the simulated and measuring outcomes justifies that the antenna is often applicable for Wi-Fi (2.4 GHz), Wi-MAX (5.25 – 5.85 GHz) and satellite (7.24 – 7.57 GHz) communications.

5

Design of a high directive sensor for microwave imaging application

Abdullah Nuruliswa, Abd Aziz Mohamad Zoinol Abidin, Shukur Jaafar Abd

Przegląd Elektrotechniczny

|

2021

|

R. 97, nr 10

8--11

EN

This paper presents a compact uniplanar Vivaldi antenna sensor for microwave imaging. It is ideal for microwave imaging systems with its large bandwidth and end-fire radiation performance. The Vivaldi patches integrate a coplanar waveguide (CPW) feed line, ensuring the entire structure is compact and simple. Reflection coefficient, radiation pattern, gain, efficiency, and directivity were the antenna parameters analyzed to determine the Vivaldi antenna's performance. The bandwidth of the antenna sensor is wider, approximately 5 GHz (3-8 GHz). The gain of the antenna is 6.72 dBi, and the directivity is 9.59 dBi.

PL

W artykule przedstawiono kompaktowy jednopłaszczyznowy czujnik antenowy Vivaldiego do obrazowania mikrofalowego. Jest idealny do systemów obrazowania mikrofalowego dzięki dużej szerokości pasma i wydajności promieniowania końcowego. Łaty Vivaldi integrują współpłaszczyznową linię zasilającą falowodu (CPW), zapewniając, że cała konstrukcja jest zwarta i prosta. Współczynnik odbicia, charakterystyka promieniowania, wzmocnienie, wydajność i kierunkowość były parametrami anteny analizowanymi w celu określenia wydajności anteny Vivaldi. Szerokość pasma czujnika anteny jest szersza, około 5 GHz (3-8 GHz). Zysk anteny wynosi 6,72 dBi, a kierunkowość 9,59 dBi.

6

Directivity error of broadband antennas at EMI measurement

Bittera M., Smiesko V.

Przegląd Elektrotechniczny

|

2012

|

R. 88, nr 6

61-63

EN

Since broadband antennas do not have the same radiation pattern as dipole antenna incidence disturbance may be measured with an error. Models of the broadband antennas for numerical simulations were created and verified. Using these models we obtained the relation between the receiving antenna directivity and measuring distance that leads into the directivity error and also affects uncertainty of the measurement.

PL

Zostały opracowane modele szerokopasmowych anten dla symulacji numerycznej. Z zastosowaniem tych modeli otrzymano relacje pomiędzy kierunkowością anteny odbiorczej oraz odległością pomiaru powodujące błędy w pomiarach kierunkowości.

7

Directional properties of the loudspeaker systems with analog and digital crossover networks

Niewiarowicz M., Łopacz H.

Archives of Acoustics

|

2008

|

Vol. 33, No. 4

541-551

EN

Directional properties of loudspeaker systems with analog and digital crossover networks have been investigated. The study has been performed for a three-way loudspeaker system subjectively classified as of average quality. The digital crossover networks have been designed in such manner that the cut-off frequencies of filters (1000 Hz and 5000 Hz) corresponded to those of the analog networks and the slopes of the amplitude characteristics were 12 and 18 dB/oct. The set of impulse responses for different angles in the whole sphere around the loudspeaker system were measured and then, applying a convolution with the excitation signals of the "tone burst" type, for some specific frequencies from the cut-off region of crossover networks, the directional characteristics have been calculated for the steady and transient states. The quantitative analyses of results, based on the values of directional coefficient, show significant differences between the characteristics in steady and transient states, as well as for the analog and digital systems.