Gain improvement for conventional rectangular horn antenna with additional two-layer wire medium structure

Kampeephat, Saran; Kamphikul, Paowphattra; Wongsan, R.

doi:10.1109/piers-fall.2017.8293555

Cited by 4 publications

(6 citation statements)

References 4 publications

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“…The comparative study as shown in Table 8 revealed that the proposed antenna structure with EBG had an advantage of being less complex than the studies [19][20][21][22][23] and [25][26][27][28][29], except for the studies [24]. The distance between the proposed antenna and the EBG was less than the studies [24][25][26][27][28], which was 0.1 mm.…”

Section: Comparison Of Researchmentioning

confidence: 93%

“…Based on these challenges, this study reviewed the antennas that can transmit and receive signals by electromagnetic waves through eucalyptus trunks that have been cut off [13][14][15][16][17][18] and to subsequently increase the efficiency of the receiving-transmitter power with EBG. The following literature on the structure of rectangular and cylindrical waveguide antennas used with the EBG was reviewed: Several studies have explored the structure of waveguide antennas of various shapes which employed EBG [19][20][21][22][23][24][25][26][27][28][29]. A conventional rectangular horn antenna was used for transmitting and receiving X-band satellite signals at the frequencies of 8 -12 GHz.…”

Section: Introductionmentioning

confidence: 99%

“…The woodpile EBG layer 1 had a radius of 2.65 λ and layer 2 had a radius 5.3 λ with a distance from the antenna (5 λ) of 15 cm. It had a gain of 24.2 dBi at the midrange frequency of 10 GHz [19]. A conventional rectangular horn antennaincorporated a asymmetric horn waveguide with hybrid metamaterial structure, for use in the secondary radar systems at 1,030, 1,090 and 1,300 MHz.…”

Section: Introductionmentioning

confidence: 99%

“…The literature review highlighted waveguide antenna structures [25][26][27][28] that used woodpile EBG to increase gain [19][20][21][22][23][24]. Based on the above, this study aimed to design a waveguide antenna structure that was simple and could adjust measurement efficiency of the moisture content in eucalyptus wood as desired.…”

Section: Introductionmentioning

confidence: 99%

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An Adjusted Waveguide Antenna with A Woodpile-Shaped EBG for Eucalyptus Wood Moisture Content Measurement

Naktong,

Puangnak,

Phanthuna

et al. 2024

Trends Sci

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A rectangular waveguide antenna was tested for eucalyptus wood moisture content (MC) measurement before being used. To improve the moisture content measurement of the rectangular waveguide antenna, a woodpile-shaped Electromagnetic Band Gap (EBG) was installed by Transverse Electric (TE) arrangement. This antenna is responsible for receiving and transmitting signals which are converted from electrical energy into radio frequency energy transmitted through the air. In this research, we take advantage of the wave propagation of antennas in the air and use them to propagate waves through wood materials. To compare signal transmission power to determine moisture content in wood and the benefit of the EBG is that it acts like a convex lens to increase the strength of the waves so that they can penetrate the wood more efficiently. The results showed that woodpile-shaped EBG could increase the efficiency of receiving and transmitting signals, reduce working hours for farmers and reduce costs by about 90 %. When this antenna was tested and actually used, it was found that the frequency band that responded best to the moisture content value was 2.20 GHz. This antenna was built with an aluminum material of size 9×4×15 cm3 and 2×6 units woodpile EBG on a 9.54×4 cm2 Polyester Mylar base plate. There was a gain of 7.81 dBi from the original structure, or by 20 %. At a radius of 4 cm, the values of moisture content ranged from –9.46 to –42.19 dBm. At a radius of 6 cm, the values were –9.41 to –42.89 dBm. At a radius of 8 cm, the values ranged from –9.39 to –43.01 dBm, respectively. All 3 values were found to be efficient. The size was not less than 84 % compared to the general standard meter. HIGHLIGHTS A rectangular waveguide antenna was tested for eucalyptus wood moisture content (MC) measurement before being used. To improve the moisture content measurement of the rectangular waveguide antenna, a woodpile-shaped Electromagnetic Band Gap (EBG) was installed by Transverse Electric (TE) arrangement. This antenna is responsible for receiving and transmitting signals which are converted from electrical energy into radio frequency energy transmitted through the air. In this research, we take advantage of the wave propagation of antennas in the air and use them to propagate waves through wood materials. To compare signal transmission power to determine moisture content in wood and the benefit of the EBG is that it acts like a convex lens to increase the strength of the waves so that they can penetrate the wood more efficiently. The results showed that woodpile-shaped EBG could increase the efficiency of receiving and transmitting signals, reduce working hours for farmers and reduce costs by about 90 %. When this antenna was tested and actually used, it was found that the frequency band that responded best to the moisture content value was 2.20 GHz. This antenna was built with an aluminum material of size 9×4×15 cm3 and 2×6 units woodpile EBG on a 9.54×4 cm2 Polyester Mylar base plate. There was a gain of 7.81 dBi from the original structure, or by 20 %. At a radius of 4 cm, the values of moisture content ranged from –9.46 to –42.19 dBm. At a radius of 6 cm, the values were –9.41 to –42.89 dBm. At a radius of 8 cm, the values ranged from –9.39 to –43.01 dBm, respectively. All 3 values were found to be efficient. The size was not less than 84 % compared to the general standard meter. GRAPHICAL ABSTRACT

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Section: Comparison Of Researchmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Adjusted Waveguide Antenna with A Woodpile-Shaped EBG for Eucalyptus Wood Moisture Content Measurement

Naktong,

Puangnak,

Phanthuna

et al. 2024

Trends Sci

View full text Add to dashboard Cite

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“…The wire medium was also applied to the horn antenna to reduce the length of the horn, whereas the aperture size of the horn did not change [16]. Later studies [17,18] reported on the influence of different wire medium structures placed at the front of the aperture of the horn antenna, resulting in higher gain and lower sidelobe level in traditional horns. From the literature review, we found that both metamaterial structures installed in front of the aperture can increase the gain of the horn antenna.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Metamaterial for the Secondary Radar Antenna System

Khamsalee

Mesawad

Wongsan

2020

J Electromagn Eng Sci

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This paper proposes the gain enhancement of dual-band and dual-polarized asymmetric horn antenna for the secondary radar system using hybrid metamaterial techniques. The hybrid metamaterial is comprised of the structures of woodpile electromagnetic bandgap (EBG) for gain enhancement of the primary main beam of the radar system at the operating frequency of 1,300 MHz with horizontal polarization; and the wire medium structure that is placed beside the EBG structure for gain improvement of the identification friend or foe (IFF) main beam, which is operated at the center frequency of 1,060 MHz with vertical polarization. Meanwhile, the cooperated structures have to function to control the directions of the primary and IFF main beams retaining at 0° and 6°, respectively, too. When the hybrid metamaterial structure is placed at the front of an asymmetric horn’s aperture, with suitable parameters and optimized spacing, it is found to increase the gains of the two beams compared to the single asymmetric horn around 3 dB and retain the directions of original main beams. The comparison of the results between simulation and measurement, such as the reflected power (S<sub>11</sub>), gain, and radiation patterns, are in good agreement.

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