Double-Dielectric Microstrip Ultrahigh-Frequency Antenna for Digital Terrestrial Television

Navarro, Antonio; Mostardinha, Pedro; Varum, Tiago; Matos, João N.; Maslovski, Stanislav I.

doi:10.3390/app10238640

Cited by 5 publications

(4 citation statements)

References 13 publications

(16 reference statements)

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“…In present-day Base Transceiver Station (BTS) systems, as well as in mobile devices, there is a tendency to employ Multiple-Input Multiple-Output (MIMO) antennas to achieve channel diversity [1][2][3][4][5][6]. Usually, elementary antennas in such MIMO systems (or antenna arrays) can be realized with inexpensive Printed Circuit Board (PCB)-based techniques (e.g., microstrip or coplanar) and can be used for transmitting and receiving all kinds of information [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Numerically Optimized Fourier Transform-Based Beamforming Accelerated by Neural Networks

Kaboutari,

Abraray,

Maslovski

2024

Applied Sciences

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Conventional beamforming methods for reconfigurable reflector antennas assume full control over the amplitude and phase of the reflected field. Here, we develop a novel beamforming methodology for reflecting Programmable Metasurfaces (PMS) with capacitive memory. Although utilizing such fully reactive PMS simplifies antenna design and reduces energy consumption, the PMS reflection magnitude is unity and thus a global optimization of the reflection phases over the PMS unit cells is required in each beamforming scenario. We propose an implementation of such an optimization method rooted in the traditional Fourier transform-based beamforming and evaluate its performance. Additionally, we show that a pair of trained feed-forward neural networks (FFNN) with one input, one hidden, and one output layer can replace time-consuming global optimizations in the case of a PMS comprising 3×10 unit cells. We train the FFNNs on a dataset obtained for typical single- and dual-beam beamforming scenarios. After training, the FFNNs perform requested beamforming tasks within a fraction of second and with about the same accuracy as the original optimization algorithm. The proposed methodology may find applications in future mobile telecommunication systems that require real-time beamforming on low-end hardware. The same beamforming methodology can be also employed in short-range wireless power transfer systems.

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Section: Introductionmentioning

confidence: 99%

“…Component;2 Remembers State;3 Complexity Class;4 Varactor;5 Multi-Beam; 6 Mechanical;7 Single-Pole-Double-Throw switch chip;8 Multi-Purpose; 9 D Flip-Flop;10 Shift Register;11 Decoder. † Under no circumstances this table should be considered as a complete list of representative works; it is only a selection based on our own preferences and limited knowledge.…”

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confidence: 99%

Numerically Optimized Fourier Transform-Based Beamforming Accelerated by Neural Networks

Kaboutari,

Abraray,

Maslovski

2024

Applied Sciences

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“…Yagi-Uda is a passive reciprocal device capable of transmitting and receiving electromagnetic energy [6], [7]. Yagi-Uda antennas are commonly used for the reception of signals in very high-frequency television [8]- [10]. Since it is a directional antenna, it has a folded dipole-driven element and some passive dipoles.…”

Section: Introductionmentioning

confidence: 99%

Self-steering Yagi-Uda antenna positioning system for television

Federis Montañez,

Alipante Vargas,

Francisco Palibino

et al. 2024

IJECE

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The aim of this study is to develop a prototype that automatically improves the position of a Yagi-Uda antenna using a microcontroller and to illustrate its radiation pattern through the use of MATLAB<sup>®</sup>. This study is intended for students and professors in the electronics engineering field. This served as their educational materials for teaching antenna system principles and theories. Developmental and experimental methods were used to achieve the objectives. The materials and components generally used in this study are a Yagi-Uda antenna, stepper motor, Arduino Uno, L293D motor shield, USB TV stick tuner, slotted optocoupler, ADS1115, coax cable splitter, speaker stand, and timing belt. The statistical tool used in this study was a Z-test to find out if the experiment results were significant. In testing the effectiveness of the automatic antenna system, the TV display in every increment of 1.8° was taken. It was the basis for the effectiveness of the study. At 5% α/2 level (1.96), the computed z value is 1.76, which is less than 1.96. Therefore, there is no significant difference between the picture quality of the TV display at every angle and the desired angle with maximum reception of the signal with the integration of MATLAB<sup>®</sup>.

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“…However, the size of the antenna was 460 mm × 460 mm with a height of 47 mm. A narrow-band microstrip patch antenna consisting of three series-fed patches and double-layer substrates was proposed at the center frequency of 754 MHz with a bandwidth of 25 MHz and gain of 10.5 dBi [ 23 ]. The three series-fed patches were printed on a 1.6 mm thick FR4 substrate, and an air spacing of 3.2 mm was used between the FR4 substrate and the ground plane.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Wideband Loop Antenna Using a Multiple Half-Circular-Ring-Based Loop Structure and Horizontal Slits for Terrestrial DTV and UHD TV Applications

Yeo

Lee

2021

Sensors

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A miniaturized wideband loop antenna for terrestrial digital television (DTV) and ultra-high definition (UHD) TV applications is proposed. The original wideband loop antenna consists of a square loop, two circular sectors to connect the loop with central feed points, and a 75 ohm coplanar waveguide (CPW) feed line inserted in the lower circular sector. The straight side of the square loop is replaced with a multiple half-circular-ring-based loop structure. Horizontal slits are appended to the two circular sectors in order to further reduce the antenna size. A tapered CPW feed line is also employed in order to improve impedance matching. The experiment results show that the proposed miniaturized loop antenna operates in the 460.7–806.2 MHz frequency band for a voltage standing wave ratio less than two, which fully covers the DTV and UHD TV bands (470–771 MHz). The proposed miniaturized wideband loop antenna has a length reduction of 21.43%, compared to the original loop antenna.

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Double-Dielectric Microstrip Ultrahigh-Frequency Antenna for Digital Terrestrial Television

Cited by 5 publications

References 13 publications

Numerically Optimized Fourier Transform-Based Beamforming Accelerated by Neural Networks

Numerically Optimized Fourier Transform-Based Beamforming Accelerated by Neural Networks

Self-steering Yagi-Uda antenna positioning system for television

Miniaturized Wideband Loop Antenna Using a Multiple Half-Circular-Ring-Based Loop Structure and Horizontal Slits for Terrestrial DTV and UHD TV Applications

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