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A Beam-Scanning Array Antenna for LPWAN Base Station
(2018-01-01)
Ngamjanvaporn, Phaisan
;
Phongcharoenpanich, Chuwong
;
Krairiksh, Monai
This paper presents a beam-scanning array antenna for LPWAN base station. The two-element array of the pattern reconfigurable Yagi-Uda antennas is designed at the 2.4 GHz ISM band to provide 360° beam-scanning. The characteristics of the array are simulated using the 4NEC2 simulator. By using the pattern reconfigurable elements and with non-uniform amplitude excitation, the simulated results show that the array provides 16 beams covering 360° with 7 dBi gain. Also, the S <inf>11</inf> bandwidth of the array is satisfied to the desired operating frequency.
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A switch-beam circular array antenna using pattern reconfigurable Yagi-Uda antenna for space communications
(2017-12-19)
Ngamjanyaporn, P.
;
Kittiyanpunya, C.
;
Krairiksh, M.
This paper presents a switch-beam circular array antenna using pattern reconfigurable Yagi-Uda antenna. A two-beam switching Yagi-Uda antenna is applied as an array element. The 3-element circular array is introduced to be able to switch the main beam in azimuth direction by switching the beam and shifting the excitation phase of array elements. The array antenna is designed at 2.4 GHz for drone or UAV radio controlling. The two-beam elements and 90°-shifted phase of excitation are applied to realize the proposed switched-beam array antenna. The simulated results show that the array antenna can provide 7 main beam directions covering a half azimuth plane (0° ≤ φ ≤ 180°) and gain of the array antenna is higher than 7 dBi.
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Dual-band conical-scanning Yagi-Uda antenna
(2017-10-18)
Kittiyanpunya, Chainarong
;
Krairiksh, Monai
A dual-band conical-scanning Yagi-Uda antenna is presented. The proposed antenna is composed of dual-band director elements, dual-band driven elements, and planar reflectors which the alignment of each element is not on the same plane of the dual-band driven elements. The PIN diodes are used in order to change position of driven elements and directors. The patterns can be switched in four directions that main beams are in the zenith angle of 30°. It is shown that the dual-band antenna for 1 and 2 GHz operation achieves an impedance bandwidth of 8.5% and 12.5%, respectively. The front-to-back ratio of conical beams is higher than 8 dB. The antenna gain is around 6 dBi.
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A phase-shifterless beam scanning array antenna for agricultural applications
(2017-07-02)
Ngamjanyaporn, Phaisan
;
Krairiksh, Monai
This paper presents a phase-shifterless beam scanning array antenna that three elements of circular array are pattern reconfigurable Yagi-Uda antennas. To minimize the antenna complexity, instead of using four beams of each element, one element uses fixed beam while the other two elements can switch radiation pattern in two directions. The radiation characteristics of the array are simulated using 4NEC2 simulator to find out the suitable array parameters. The suitable element orientation of 45° and the array radius of 0.65λ, and with non-uniform amplitude excitation, the array provides four beams that cover 150° with gain 7-9 dBi. The array has been validated by experiments. The four beams of the array show good agreement with the simulated ones.
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Pattern and frequency reconfigurable meander line Yagi-Uda antenna
(2016-01-20)
Utayo, M.
;
Sangthongngam, W.
;
Kittiyanpunya, C.
;
Krairiksh, M.
This paper presents a pattern and frequency reconfigurable meander line Yagi-Uda antenna for digital terrestrial television reception. To achieve a compact size for installing on a vehicle, the antenna is designed with meander line. The main beam switching and resonant frequency tuning are accomplished by loading two driven elements and four parasitic elements with the short or open of RF switches. The frequency is reconfigured with different electrical length of the driven element. The direction of the beam is shifted by alternating the short or open status of RF switches in parasitic elements.
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Pattern reconfigurable printed Yagi-Uda antenna
(2015-01-28)
Kittiyanpunya, Chainarong
;
Krairiksh, Monai
This paper presents a pattern reconfigurable antenna which is based on Yagi-Uda dipole antenna. The antenna can operate at ISM band of 2.45 GHz. It consists of microstrip-to-coplanar stripline (CPS) transition, driven elements and parasitic elements. The switch of driven element can be controlled by using PIN diodes while parasitic element function can be either reflector or director with different PIN diode states. The maximum of radiation patterns are in azimuth plane with four directions around the antenna to the directions of O = 40°, 120°, 220° and 320°.
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Design of a 24 GHz pattern reconfigurable slotted Yagi-Uda antenna on substrate integrated waveguide
(2013-09-02)
Limpiti, T.
;
Krairiksh, M.
This paper presents the design of a linearly polarized pattern reconfigurable antenna whose configuration employs a single feed and a low profile cavity backed slot antenna. The grounded coplanar waveguide feed is adopted to excite the slotted Yagi-Uda structure which is constructed on the substrate integrated waveguide (SIW). The whole antenna is thus completely constructed on a single layer of a printed circuit board (PCB) substrate. The concept of pattern reconfiguration is based on switching function between the director- and the reflector-parasitic slots of PIN diodes. This antenna is designed to operate at the frequency of 24 GHz that there are various applications, e.g., Doppler sensor in automotive and industrial applications, security applications, and communication applications. The simulation results show good matching and interesting performance in reconfiguring the radiation patterns. © 2013 IEEE.
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A four-beam pattern reconfigurable Yagi-Uda antenna
(2013-01-01)
Kittiyanpunya, C.
;
Krairiksh, M.
This communication presents a pattern reconfigurable antenna which is based on the Yagi-Uda configuration that can change the radiation beam into four directions. The function of the parasitic elements can be altered between a director and a reflector with PIN diodes while the driven element can be altered between two perpendicular directions with RF switches. To be able to use this proposed antenna on an electric conductor, such as on the vehicle rooftop, the antenna is thus mounted on electromagnetic band gap (EBG) structure which serves as a magnetic conductor. The gain is approximately 5 dBi and the field trial exhibited the diversity gain of 17 dB over the fixed beam antenna. As a result, the proposed antenna possesses high potential for further development into a TV signal reception on moving vehicles. © 2013 IEEE.

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