Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "circular polarization" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-9 z 9
    Tytuł:
    Design and Development of Biodegradable 3D Printed RDRA for Polarization Reconfigurability
    Autorzy:
    Apparao, Maganti
    Karunakaran, Godi
    Powiązania:
    https://bibliotekanauki.pl/articles/2200726.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polarization switching
    circular polarization
    linear polarization
    dielectric resonator antennas
    Opis:
    In this article, a 3D printed rectangular dielectric resonator antenna which is capable of polarization reconfiguration has been designed. Dielectric resonator is composed of environment friendly and biodegradable material, which is Polylactic Acid. In the proposed model, the polarization can be switch from a linear to a circular by changing the state of a switch, electonically. The antenna switch between two different polarizations: Linear polarization during OFF STATE and Lefthand circular polarization during ON STATE. The proposed 3D printed dielectric resonator antenna is designed to operate in Cband of microwave spectrum, with a broad effective bandwidth (overlapped impedance bandwidths of both states) of 14.542% with centre frequency at 5.845GHz and peak gain 5.5dBi. Further, validated simulated results with experiment and both results are in good agreement.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 1; 69--74
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculations of Electric Fields of Circular Screened Systems, Generated from Cylindrical Piezoceramic Radiators
    Autorzy:
    Leiko, Aleksandr
    Derepa, Anatolii
    Rasstrygin, Aleksandr
    Kosiakovskyi, Andrii
    Kocharian, Oksana
    Starovoit, Yaroslav
    Powiązania:
    https://bibliotekanauki.pl/articles/176548.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    electric fields
    circular system with baffle
    piezoceramic cylindrical radiator
    circular polarization
    Opis:
    Analytical relations, describing the electrical fields of cylindrical piezoceramic radiators with circular polarization as a member of the cylindrical systems with the baffle in the inner cavity, using the related fields method in multiply connected regions were obtained. Comparative analysis of the results of numerical experiments performed on the frequency characteristics of the electric field of the radiating systems for different modes of radiation allow to establish a number of subtle effects of the formation of the electric field of radiators.
    Źródło:
    Archives of Acoustics; 2019, 44, 1; 129-135
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Analysis of a Hybrid Circularly Polarized Multi-Band MIMO Antenna for Sub 6 GHz Applications
    Autorzy:
    Salma, S.
    Khan, Habibulla
    Madhav, B. T. P.
    Sandeep, D. Ram
    Suman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055219.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    axial ratio
    circular polarization
    MIMO antennas
    SEA
    single element antenna
    Opis:
    In this article, a hybrid circularly polarized Multiple-Input Multiple-Output (MIMO) antenna for multi-band operation from 2.3 to 9.2 GHz with an impedance bandwidth of 7 GHz is proposed and investigated experimentally. The designed MIMO antenna model has a compact size of 20mm×40mm×1.6mm on the FR-4 substrate. The microstrip feed of the proposed slot antenna consists of a tapered structure, and the radiating element consists of the inverted L- shaped slots, which were opened on both sides of the radiating elements to introduce notches at the sub-6 GHz frequencies. L-shaped stubs are also introduced on another side of the substrate in the common ground plane to attain high isolation between the radiating elements of the proposed antenna. In the operating band from 2.3 to 9.2 GHz, isolation of less than -20 dB is achieved by the proposed model. The performance of the circularly polarized MIMO antenna in terms of RHCP and LHCP radiation patterns, axial ratio, surface current distributions, isolation between the ports, diversity gain (DG), envelope correlation coefficient (ECC), total active reflection coefficient (TARC), and peak gain are studied and presented in this work. The obtained characteristics of the proposed antenna make it suitable for sub-6-GHz frequency applications.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 570--577
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Dual-band Circularly-polarized Printed Monopole Antenna for Wi-Fi and WiMAX Applications
    Autorzy:
    Lwin, Zaw Myo
    Aye, Thae Su
    Powiązania:
    https://bibliotekanauki.pl/articles/307652.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    circular polarization
    dual-band antenna
    printed monopole antenna
    rectangular slit
    Opis:
    This paper presents a rectangular-shaped printed monopole antenna with circular polarization for Wi-Fi (2.4–2.484 GHz) and WiMAX (3.3-3.7 GHz) bands. The antenna relies on asymmetric arrangement of the patch with respect to the microstrip feed, in order to generate circular polarization. Dual-band (Wi-Fi and WiMAX) operation is enabled by inserting a slit in the corner of the ground plane. Simulation results show a bandwidth increase of 15.9% (2.2–2.58 GHz) for Wi-Fi, and of 24.16% (3.13–3.99 GHz) for WiMAX applications. Furthermore, beamwidths at the axial ratio of 3 dB equal 48˚ and 51˚ for the x-z plane and y-z planes, respectively.
    Źródło:
    Journal of Telecommunications and Information Technology; 2019, 4; 50-54
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of C-PolSK Modulation in FSO Network and Analysis of its Atmospheric Performance
    Autorzy:
    Chattopadhyay, Diptangshu
    Bharti, Manisha
    Powiązania:
    https://bibliotekanauki.pl/articles/309433.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    attenuation
    bit error rate
    circular polarization shift keying
    quality factor
    Opis:
    Free Space Optical (FSO) communication is a quickly developing technology that is designed to handle high data rates while maintaining a good quality factor (Q-factor). Many novel techniques have been implemented to cope with atmospheric attenuating factors, such as fog and rain. Here, we have introduced circular polarization shift keying (C-PolSK) modulation to produce a stable and uniform light beam. The plane of polarized light keeps rotating along with the propagation vector, which helps reduce phase variations and cross-channel effects. C-PolSK provides higher penetrating power and attenuation resistance over linear polarization shift keying (L-PolSK). Two different C-PolSK models have been proposed and graphical comparisons, relying on such parameters as Q-factor, transmission distance and inputoutput power, have been made. The cases of moderate fog and rain attenuation are taken to verify the model’s efficiency. Polarized light is split into two orthogonal components and then modulated using the Mach-Zehnder modulator. One of the models also employs the principle of orthogonal differential phase shifting. Eye diagrams have been provided to verify the bit error rate (BER). The orthogonal differential phase shifted C-PolSK model proves to be the most suitable implementation prototype.
    Źródło:
    Journal of Telecommunications and Information Technology; 2019, 4; 43-49
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    E-shaped Aperture Coupled Microstrip Patch Array Antenna for High Speed Downlink Applications in Small Satellites
    Autorzy:
    Paul, Kajol Chandra
    Ahmed, Anis
    Powiązania:
    https://bibliotekanauki.pl/articles/2055242.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aperture coupled
    circular polarization
    corporate feed
    microstrip patch array
    small satellites
    Opis:
    For high speed downlinking of payload data from small satellites, a new 4×4 aperture coupled microstrip patch array antenna has been presented. The antenna is designed for the Ku band and a peak gain of 18.0 dBi is achieved within the impedance bandwidth from 11.75 GHz to 12.75 GHz. Wide bandwidth is achieved as the patch elements are excited through E-shaped slots having asymmetric side lengths and widths. Each square patch element of the array with truncated corners and appropriately placed slots generates right hand circularly polarized (RHCP) radiation with very high cross-polarization discrimination. A corporate feed network consisting of T-junctions and quarter-wave impedance transformers is developed to feed the array elements from a single coaxial port of 50 Ω. To improve the radiation from the patches and wave-guiding in the feed network, two types of Rogers substrates with different dielectric constant and thickness are considered. Our proposed microstrip patch array antenna of size 7.8 cm × 6.4 cm × 0.3 cm can perform efficiently with a downlink data rate as high as 4.6 Gbps for small satellites.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 1; 47--56
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A design framework for rigorous constrained EM-driven optimization of miniaturized antennas with circular polarization
    Autorzy:
    Bekasiewicz, Adrian
    Koziel, Slawomir
    Powiązania:
    https://bibliotekanauki.pl/articles/220503.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    axial ratio
    antenna miniaturization
    circular polarization antenna
    constrained optimization
    EM-driven design
    Opis:
    Compact radiators with circular polarization are important components of modern mobile communication systems. Their design is a challenging process which requires maintaining simultaneous control over several performance figures but also the structure size. In this work, a novel design framework for multi-stage constrained miniaturization of antennas with circular polarization is presented. The method involves sequential optimization of the radiator in respect of selected performance figures and, eventually, the size. Optimizations are performed with iteratively increased number of design constraints. Numerical efficiency of the method is ensured using a fast local-search algorithm embedded in a trust-region framework. The proposed design framework is demonstrated using a compact planar radiator with circular polarization. The optimized antenna is characterized by a small size of 271 mm2 with 37% and 47% bandwidths in respect of 10 dB return loss and 3 dB axial ratio, respectively. The structure is benchmarked against the state-of-the-art circular polarization antennas. Numerical results are confirmed by measurements of the fabricated antenna prototype.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 1; 41-52
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mid-infrared polarization beam splitter based on square/circular hybrid air holes with wide bandwidth and ultrashort length
    Autorzy:
    Zheng, Guang-Ming
    Powiązania:
    https://bibliotekanauki.pl/articles/2172822.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    polarization beam splitter
    mid-infrared
    photonic crystal fibre
    bandwidth
    square air hole
    circular air hole
    Opis:
    A novel mid-infrared polarization beam splitter (PBS) based on GaS is proposed. The high birefringence is achieved by using the cladding structure of alternating arrangement of square and circular air holes as well as introducing double elliptical air holes. The finite element method (FEM) is utilized to investigate the mode coupling characteristics in the proposed PBS. The results show that the highest extinction ratio of 115 dB and shortest length of only 40 μm can be realized at a wavelength of 4 μm. A wide bandwidth of 200 nm ranging from 3.9 to 4.1 μm is obtained.
    Źródło:
    Optica Applicata; 2022, 52, 3; 345--358
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differential diagnostics of aseptic and septic loosening of the cup of the endoprosthesis of the artificial hip joint by the methods of polarisation tomography
    Diagnostyka różnicowa aseptycznego i septycznego obluzowania panewki endoprotezy stawu biodrowego metodami tomografii polaryzacyjnej
    Autorzy:
    Ushenko, Alexander G.
    Olar, Olexander
    Powiązania:
    https://bibliotekanauki.pl/articles/407968.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    polarization tomography
    Mueller matrix
    circular birefringence
    synovial film
    tomografia polaryzacyjna
    macierz Muellera
    dwójłomność kołowa
    błona maziowa
    Opis:
    Manuscript contains structural-logical scheme and analytical description of the differential diagnosis of aseptic and septic loosening of the artificial hip joint endoprosthesis using the methods of differential Mueller-matrix mapping of circular birefringence (CB) distributions of polycrystalline synovial films (SF) and results of determining the sensitivity, specificity and accuracy of the wavelet analysis method of differential Mueller-matrix mapping of the distributions of the CB values of polycrystalline films SF patients from the control group and groups with different severity of the hip joint pathology.
    Manuskrypt zawiera schemat strukturalno-logiczny i opis analityczny diagnostyki różnicowej aseptycznego i septycznego obluzowania sztucznej endoprotezy stawu biodrowego z wykorzystaniem metod różnicowego mapowania macierzy Muellera rozkładów dwójłomności kołowej polikrystalicznych filmów błony maziowej i wyników określania czułości, swoistości i dokładności metody analizy falkowej różnicowego mapowania macierzy Muellera rozkładów wartości dwójłomności kołowej polikrystalicznych filmów SF pacjentów z grupy kontrolnej i grup o różnym nasileniu patologii stawu biodrowego.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2019, 9, 3; 22-25
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies