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1
Content available Design and Development of Biodegradable 3D Printed RDRA for Polarization Reconfigurability
Apparao Maganti, Karunakaran Godi
International Journal of Electronics and Telecommunications
|
2023
|
Vol. 69, No. 1
69--74
EN
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.
2
Content available E-shaped Aperture Coupled Microstrip Patch Array Antenna for High Speed Downlink Applications in Small Satellites
Paul Kajol Chandra, Ahmed Anis
International Journal of Electronics and Telecommunications
|
2022
|
Vol. 68, No. 1
47--56
EN
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.
3
Content available Design and Analysis of a Hybrid Circularly Polarized Multi-Band MIMO Antenna for Sub 6 GHz Applications
Salma S., Khan Habibulla, Madhav B. T. P., Sandeep D. Ram, Suman M.
International Journal of Electronics and Telecommunications
|
2021
|
Vol. 67, No. 4
570--577
EN
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.
4
Content available remote Analysis and design of circularly polarized capacitively-fed planar suspended antenna for universal UHF RFID applications
Boonying Komkris, Phongcharoenpanich Chuwong
Przegląd Elektrotechniczny
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2020
|
R. 96, nr 1
100--107
EN
This research paper deals with the design of a circularly polarized reader antenna with a tennis ball-shaped radiating plate that operates at a frequency range of 860-960 MHz with the center frequency of 910 MHz. In the fabrication of the tennis ball-shaped radiating plate, a small annularring slot was first created on a circular radiating plate, followed by two diagonally opposite large arc-shaped annular-ring slots on either edge of the circular radiating plate and then the truncation of the corners of the remaining main element of the plate. A prototype antenna with the final tennis ball-shaped plate was subsequently assembled prior to excitation by the capacitively coupled feed technique to enhance |S11| bandwidth. The prototype antenna could achieve an average gain of 6.18 dBic, |S11| covering the frequency range of 837.6-966.2 MHz, and the circular polarization of 850.6-963.5 MHz, making it suitable for universal UHF RFID applications. In addition, simulations were carried out using CST Microwave Studio for comparison with the experimental results.
PL
W artykule zaprezentowano projekt anteny o kształcie piłki tenisowej pracujacej w zakresie częstotliwopści 860 – 960 MHz. Prototyp anteny pokrywał zakrs 837.6 – 966.2 MHz co spełnia wymagania uniwersalnej komunikacji UHF RFID.
5
Zestaw do odbioru sygnałów z satelity meteorologicznego
Borkowski Jarosław A., Kubacki Roman
Elektronika : konstrukcje, technologie, zastosowania
|
2020
|
Vol. 61, nr 7
4--8
PL
W pracy przedstawiono opracowane i zbudowane stanowisko do odbioru sygnałów z satelitów okołobiegunowych. Do analiz odbieranych sygnałów wykorzystano radio programowalne RTL-SDR. Badania oparto głównie na amerykańskich satelitach meteorologicznych z rodziny NOAA, mimo to zestaw jest w stanie odbierać sygnały w każdym systemie mieszczącym się w zakresie pracy RTL-SDR z dołączoną odpowiednią anteną dostosowaną do danego systemu komunikacyjnego. W pracy skupiono się na odbiorze sygnałów w systemie APT i HRPT oraz zaproponowano anteny do odbioru tych sygnałów. Do odbioru w systemie APT została obliczona i zbudowana antena krzyżowa, natomiast do odbioru w systemie HRPT zaprojektowano antenę mikropaskową. Obie anteny charakteryzowały się dookólnością oraz wirującą polaryzacją.
EN
In the paper, the apparatus for the signals from the meteorological satellite has been developed and manufactured. To analyse the received signals from per-pole satellites the programmable RTL-SDR radio was used. The research was mainly based on American meteorological satellites from the NOAA family, yet the set is able to receive signals in any system within the range of RTL-SDR operation with an appropriate antenna attached to the communication system. This publication focuses on the receiving of signals in APT and HRPT systems and proposes antennas to receive these signals. A helical antenna has been calculated and built for receiving in APT system, while a microstrip antenna has been designed for receiving in HRPT system. Both antennas were characterized by generality and circular polarization.
6
Content available A Dual-band Circularly-polarized Printed Monopole Antenna for Wi-Fi and WiMAX Applications
Lwin Zaw Myo, Aye Thae Su
Journal of Telecommunications and Information Technology
|
2019
|
nr 4
50--54
EN
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.
7
Content available Calculations of Electric Fields of Circular Screened Systems, Generated from Cylindrical Piezoceramic Radiators
Leiko Aleksandr, Derepa Anatolii, Rasstrygin Aleksandr, Kosiakovskyi Andrii, Kocharian Oksana, Starovoit Yaroslav
Archives of Acoustics
|
2019
|
Vol. 44, No. 1
129--135
EN
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.
8
Szerokopasmowy planarny szyk antenowy z polaryzacją kołową
Bogdan G.
Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
|
2016
|
nr 6
265—268, CD
PL
W artykule przedstawiono 64-elementowy planarny szyk antenowy złożony z 16 znanych podszyków i zrealizowany w technologii mikropaskowej. Szyk antenowy pracuje w paśmie 4,4-5,0 GHz co stanowi 13% wzglę nej szerokości pasma. Zysk maksymalny w polaryzacji kołowej lewoskrętnej wynosi 22 dBi i nie mniej niż 17 dBi w paśmie pracy. Sieć zasilającą zrealizowano w postaci linii paskowej umieszczonej pod warstwą promienników a połączenie promienników z siecią zasilająca zrealizowano za pomocą przelotek.
EN
In this paper a 64-element planar antenna array composed of 16 known sub-arrays is presented. The antenna bandwidth is from 4.4 GHz to 5.0 GHz which equals 13% of relative bandwidth. The gain in left hand circular polarization was measured around 22 dBi (maximum) and is not less than 17 dBi in whole operational bandwidth. The feeding network is implemented as stripline technology underneath the radiators’ substrate. Radiators and the feeding network are interconnected by vias.
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