Temat: microstrip antennas - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A lightweight planar antenna element with optimized feed for use onboard spacecraft
Autorzy:: Wincza, K.
Kabacik, P.
Powiązania:: https://bibliotekanauki.pl/articles/307761.pdf
Data publikacji:: 2005
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: microstrip antennas
spaceborne antennas
circularly polarized antennas
Opis:: This paper is a report on low gain antennas (LGAs) manufactured with bonded lightweight materials. These antennas can sustain large temperature variations and are capable of functioning in modern miniature spacecraft, mainly in the telemetry, command and ranging (TC&R) links. When made of cheaper materials, the proposed circularly polarized antenna can be widely used in the base stations of short-range wireless systems. The recommended operating frequencies are between 1 and 8 GHz. One major technical consideration is obtaining the required high quality of circular polarization with as low space demands as possible. A lightweight 90? polarizer, printed on a dielectric membrane and operating over a broad bandwidth, is proposed for the antenna feed. Owing to the bandwidth advantage of the polarizer and the use of carefully designed aperture coupled feed, the electrical characteristics maintain good properties over a wide frequency range (15%).
Źródło:: Journal of Telecommunications and Information Technology; 2005, 2; 53-56
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Optimizing circular polarization within a beam of patch antenna elements
Autorzy:: Hornik, M.
Hornik, P.
Guzda, D.
Kabacik, P.
Powiązania:: https://bibliotekanauki.pl/articles/307578.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: lightweight antennas
circularly polarized antennas
microstrip antennas
Opis:: The paper presents the results of an investigation into patch antenna elements that would be capable of pro- viding good circular polarization not only in the broadside direction, but also over a wide range of elevation angles.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 1; 18-22
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Spatial power combiner using a planar active transmitarray of stacked patches
Autorzy:: Tai, F.-C. E.
Białkowski, M. E.
Powiązania:: https://bibliotekanauki.pl/articles/307767.pdf
Data publikacji:: 2005
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: active antennas
amplifiers
microstrip antennas
planar arrays
power combiners
Opis:: An X-band spatial power combiner, which uses a planar transmitarray (TXA) of orthogonally polarized stacked microstrip patches integrated with input and output ports of transistor amplifiers is described. In order to obtain an increased operational bandwidth, the unit cell of the combiner with various stacked patch (SP) configurations is investigated. The configuration showing the smallest insertion losses is chosen for developing a TXA. The constructed spatial combiner includes a 4×4 cell TXA placed between two hard horn antennas. Its performance is assessed experimentally in terms of amplification gain and combining efficiency.
Źródło:: Journal of Telecommunications and Information Technology; 2005, 2; 45-49
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: New type of microstrip antenna with ferroelectric layer
Autorzy:: Modelski, J.
Yashchyshyn, Y.
Powiązania:: https://bibliotekanauki.pl/articles/309114.pdf
Data publikacji:: 2001
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: microstrip antenna
multilayered structure
ferroelectric thin tape
smart antennas
Opis:: A new type of microstrip antenna is proposed using a voltage-controlled ferroelectric thin tape in the multilayered structure. This paper presents the ferroelectric thin tape, its theoretical analysis and design. The results indicate that this concept has many advantages, is very practical and promising. It gives possibilities of several applications, e.g. in smart antennas.
Źródło:: Journal of Telecommunications and Information Technology; 2001, 4; 37-40
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Hybrid adaptive beamforming approach for antenna array fed parabolic reflector for C-band applications
Autorzy:: Bawane, Sheetal
Kumar Panda, Debendra
Powiązania:: https://bibliotekanauki.pl/articles/27314230.pdf
Data publikacji:: 2023
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: microstrip patch
adaptive antennas
parabolic reflector
beamforming
antenna arrays
smart antenna
Opis:: This paper presents the design of a parabolic reflector fed through a patch antenna array feed to enhance its directivity and radiation properties. Adaptive beam for‐ mers steer and alter an array’s beam pattern to increase signal reception and minimize interference. Weight selec‐ tion is a critical difficulty in achieving low SLL and beam width. Low Side Lobe Level [SLL]and narrow beam reduce antenna radiation and reception. Adjusting the weights reduces SLL and tilts the nulls. Adaptive beam formers are successful signal processors if their array output con‐ verges to the required signal. Smart antenna weights can be determined using any window function. Half Power Beam Width and SLL could be used to explore different algorithms. Both must be low for excellent smart antenna performance. In noisy settings, ACLMS and CLMS create narrow beams and side lobes. AANGD offers more control than CLMS and ACLMS. The blend of CLMS and ACLMS is more effective at signal convergence than CLMS and AANGD. It presents an alternative to the conventionally used horn‐based feed network for C‐band applications such as satellite communication. Broadside radiation patterns and 4x4 circular patch antenna arrays are used in the proposed design. 1400 aperture illumination is pro‐ vided by the array’s feed parabolic reflector, whose F/D ratio is 0.36. The proposed design’s efficacy is assessed using simulation analysis.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2023, 17, 1; 45--50
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Fuzzy Logic Based Intelligent Data Sensitive Security Model for Big Data in Healthcare
Autorzy:: Dubey, Somya
Verma, Dhanraj
Powiązania:: https://bibliotekanauki.pl/articles/2055246.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microstrip patch
adaptive antennas
parabolic reflector
beamforming
antenna arrays
smart antenna
Opis:: An intelligent security model for the big data environment is presented in this paper. The proposed security framework is data sensitive in nature and the level of security offered is defined on the basis of the data secrecy standard. The application area preferred in this work is the healthcare sector where the amount of data generated through the digitization and aggregation of medical equipment’s readings and reports is huge. The handling and processing of this great amount of data has posed a serious challenge to the researchers. The analytical outcomes of the study of this data are further used for the advancement of the medical prognostics and diagnostics. Security and privacy of this data is also a very important aspect in healthcare sector and has been incorporated in the healthcare act of many countries. However, the security level implemented conventionally is of same level to the complete data which not a smart strategy considering the varying level of sensitivity of data. It is inefficient for the data of high sensitivity and redundant for the data of low sensitivity. An intelligent data sensitive security framework is therefore proposed in this paper which provides the security level best suited for the data of given sensitivity. Fuzzy logic decision making technique is used in this work to determine the security level for a respective sensitivity level. Various patient attributes are used to take the intelligent decision about the security level through fuzzy inference system. The effectiveness and the efficacy of the proposed work is verified through the experimental study.
Źródło:: International Journal of Electronics and Telecommunications; 2022, 68, 2; 245--250
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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