Development of Learning Innovation of DTV Antennas for Telecommunication Education

Rachchompoo, Siwanat; Intarawiset, Nattapong; Akatimagool, Somsak; Chaiyawong, Kobkhun

doi:10.1109/icteched749582.2020.9101236

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…As shown in Figure 13a,b, the optimal Dref and Lref were 78.61 mm and 226.42 mm, respectively, covering the target operating frequency band of 470-890 MHz. Figure 13c shows the simulated impedance bandwidth under variable reflector height (href) (25,45,65, and 85 mm), and Figure 13d illustrates the corresponding simulated radiation pattern at 890 MHz. The larger href improved the back lobe level (i.e., front-to-back ratio), especially in the upper frequency band.…”

Section: Prototype Fabrication and Measured Resultsmentioning

confidence: 99%

“…Meanwhile, the LPDA and quasi-Yagi antennas realize a high gain by using multiple dipoles. However, the unidirectionality of the LPDA and quasi-Yagi antennas gives rise to several installation challenges [ 24 , 25 , 26 ]. To overcome such shortcomings, this research thus combined the Yagi-Uda and bowtie antenna technologies in the development of the portable wideband directional antenna scheme with a radome for digital television reception.…”

Section: Introductionmentioning

confidence: 99%

“…In other words, the optimal overall length of the folded bowtie radiator was 202 mm.Figure 13a,b shows the simulated impedance bandwidth (|S 11 | ≤ −10 dB) under variable distance from the center of the supporting plate to the reflector (D ref ) and reflector length (L ref ). As shown in Figure 13a,b, the optimal D ref and L ref were 78.61 mm and 226.42 mm, respectively, covering the target operating frequency band of 470-890 MHz.Figure13cshows the simulated impedance bandwidth under variable reflector height (h ref )(25, 45, 65, and 85 mm), and Figure13dillustrates the corresponding simulated radiation pattern at 890 MHz. The larger h ref improved the back lobe level (i.e., front-to-back ratio), especially in the upper frequency band.…”

mentioning

confidence: 99%

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Portable Wideband Directional Antenna Scheme with Semicircular Corrugated Reflector for Digital Television Reception

Luadang

Pukraksa

Janpangngern

et al. 2022

Sensors

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This research proposed a portable wideband horizontally-polarized directional antenna scheme with a radome for digital terrestrial television reception. The operating frequency band of the proposed antenna scheme is 470–890 MHz. The portable antenna scheme was an adaptation of the Yagi-Uda antenna, consisting of a folded bowtie radiator, a semicircular corrugated reflector, and a V-shaped director. Simulations were carried out, and an antenna prototype was fabricated. To validate, experiments were undertaken to assess the antenna performance, including the impedance bandwidth (|S11| ≤ −10 dB), gain, and unidirectionality. The measured impedance bandwidth was 75.93%, covering 424–943 MHz, with a measured antenna gain of 2.69–4.84 dBi. The radiation pattern was of unidirectionality for the entire operating frequency band. The measured xz- and yz-plane half-power beamwidths were 150°, 159°, 160° and 102°, 78°, 102° at 470, 680, and 890 MHz, with the corresponding cross-polarization below −20 dB and −40 dB. The radome had a negligible impact on the impedance bandwidth, gain, and radiation pattern. The power obtained for the outdoor test, at 514 MHz, was 38.4 dBµV (−70.4 dBm) with a carrier-to-noise ratio (C/N) of 11.6 dB. In addition, the power obtained for the indoor test was 26.6 dBµV (−82.2 dBm) with a C/N of 10.9 dB. The novelty of this research lies in the concurrent use of the Yagi-Uda and bowtie antenna technologies to improve the impedance bandwidth and directionality of the antenna for digital terrestrial television reception.

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Section: Prototype Fabrication and Measured Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Portable Wideband Directional Antenna Scheme with Semicircular Corrugated Reflector for Digital Television Reception

Luadang

Pukraksa

Janpangngern

et al. 2022

Sensors

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show abstract

“…Antenna types commonly used for indoor terrestrial DTV reception include loop, dipole, monopole, log-periodic dipole array (LPDA), and quasi-Yagi antennas [ 5 ]. The quasi-Yagi and LPDA antennas have high gain from using multiple dipoles, but it is necessary to check the receiving direction and adjust the location because of directivity [ 6 , 7 , 8 , 9 ]. On the other hand, the omni-directional dipole, monopole, and loop antennas can receive from all directions, but have low gain [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…It covered the 460–1270 MHz frequency band with gain of 4.74–6.23 dBi and a 290 mm × 221 mm antenna size. A three-element Yagi-Uda antenna with a gain of 4 dBi and a six-element LPDA antenna with gain of 5 dBi operating in the DTV band were developed for telecommunication engineering education [ 8 ]. The size of the Yagi-Uda antenna was 226 mm × 206 mm, whereas that of the LPDA antenna was 283 mm × 248 mm.…”

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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Design and Optimization of a Yagi-Uda 5G-Rejecting TV Antenna

Adam,

Lazaridis,

Ahmed

et al. 2024

Mechanisms and Machine Science

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Development of Learning Innovation of DTV Antennas for Telecommunication Education

Cited by 3 publications

References 8 publications

Portable Wideband Directional Antenna Scheme with Semicircular Corrugated Reflector for Digital Television Reception

Portable Wideband Directional Antenna Scheme with Semicircular Corrugated Reflector for Digital Television Reception

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

Design and Optimization of a Yagi-Uda 5G-Rejecting TV Antenna

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