• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.5
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• pp.567-574
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• 2014

In this paper, a VHF antenna with monopole structure is designed and fabricated for marine wireless communication applications. The proposed antenna is based on a monopole design, and composed of circular ring and meander structure for VHF operation which cover VHF frequency bands. To obtain the optimized parameters, we used the simulator, Ansoft's High Frequency Structure Simulator(HFSS) and found the parameters that greatly effect antenna characteristics. Using the obtained parameters, the antenna is fabricated. The experiment results demonstrated that the proposed antenna satisfied the -10 dB impedance bandwidth requirement while covering the VHF bands. And measured characteristics of gain and radiation patterns are obtained for operating bands.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.5
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• pp.937-942
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• 2018

This paper maximizes the research on broadband characteristics by using air layer instead of using microstrip structure of radiation part with U-shaped slot patched inside and microstrip antenna in order to make the microstrip antenna to have broadband characteristics. Experimental results show that the VSWR is 1.4 or less than the mobile communication frequency band(820~950MHz) and the gain of the antenna is 8.2dBd. This means that the antenna can be miniaturized, and it can be used in the wireless communication fields, and the mobile communication fields for other frequency bands in the future.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.2
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• pp.265-271
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• 2015

In this paper, Dualband meander microstrip antenna is proposed for Wireless Body Area Network application. Designed antenna is mounted on the phantom to maintain a constant distance of the substrate, and studied the characteristics related to change in several meaningful parameters to improve performance. Characteristics of antenna, returnloss, radiation pattern, gain, bandwidth, are analyzed using Computer Simulation Technologes(CST) software. The proposed antenna operates at 4.33Ghz and 6.09GHz ~ 9.88GHz for UWB. The antenna showed that returnloss and -10dB bandwidth are -42.30dB and 410Mhz at 4.33GHz, maximum -29.11dB and 3.75GHz at 6.1GHz ~ 9.8GHz.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.29 no.1
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• pp.20-23
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• 2018

In this work, an aperture-coupled patch array antenna with wideband characteristics was designed and arrayed in a $4{\times}1$ S-band. The designed antenna structure consists of two layers, and it possesses wideband characteristics achieved using coupling between the two layers. The first layer is comprised of four radiation patches and the second layer has an aperture and a ground plane. The antenna structure possesses 15 % wideband characteristics and the center frequency is at 3.2 GHz. A phase shifter was added to the array antenna to enable beam steering. The proposed phase array antenna was fabricated and measured. Our proposed design enables beam steering up to $35^{\circ}$.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.1
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• pp.33-39
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• 2008

In this paper, a broadband rectangular reflector antenna with 16-array elements for WiBro/WiMAX band(2.3${\sim}$3.5 GHz) is designed, and its radiation characteristics are investigated. The designed antenna is composed of the IBBD(Integrated Balun Bow-tie Dipole) elements and has the feed circuit at the rear of the reflector to reduce the unwanted electromagnetic wave from it. To confirm the broadband characteristics of the designed antenna, test antenna is fabricated and its radiation characteristics are measured, compared with calculated results. The measured results show good agreement with the calculated results. As a result of measurements, 1.8GHz of bandwidth(VSWR<1.6) is achieved at $2.06{\sim}3.89GHz$ and the antenna gain over 10.3 dBi. We confirm that the designed antenna can be used as a broadband antenna for WiBro/WiMAX.

• The Journal of the Korea Contents Association
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• v.7 no.11
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• pp.76-83
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• 2007

In the sequentially rotated array antennas, the characteristics of antenna gain, axial ratio and cross polarization have been analyzed with a varying of sequential array constant(number of array element, figure of rotation) respectively. Where the antenna element of array is a probe feeding, LHCP truncated microstrip antenna whose resonant frequency is in 11.85GHz. The simulation results of 23 SRA antennas((M=2, 3, 4, 6, 8), $(1\leqP\leqM)$) has shown as follows. The widest 3dB bandwidth of axial ratio appears at P=2 which is in-dependant of M, the highest antenna gain appears when a sequential array constant has a pair of (2, 1), (3, 2), (4, 1), (6, 3), (8, 1) respectively. Specially, all of the SRA antenna appear very poor characteristics in case of M=P. Therefore the SRA antenna has to be designed as selecting a optimal sequential array constant among a lot of simulation data.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.25 no.1
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• pp.39-46
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• 2014

In this paper, to operate 2.4 GHz Inverted-L antenna with On-Board Broadband characteristics is proposed. The antenna was designed on the system board, the bandwidth by adjusting the reactance of the antenna that was formed common-mode and differential-mode on the antenna stubs has been improved. The system size is $80mm{\times}60mm$, the size of the antenna was limited to $30mm{\times}60mm$, the thickness of FR4 dielectric substrate is 0.8 mm, FR4 dielectric constant 4.4 is used. The experimental results, the bandwidth from 17.2 to 24.1 %, the gain is 3.01~4.71 dB, omni-directional radiation pattern characteristics were obtained. By a mobile terminal design applying the results of the paper, the handset's price competitiveness and production efficiency can be improved.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.41 no.2
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• pp.41-51
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• 2004

In this paper, the beam steering dipole phased array antenna systems for IMT-2000 base station have been designed. The designed beam steering dipole phased array antenna systems are constituted by the antenna part and the beam steering control system part. The antenna part is designed by the proposed flat dipole for the broadband characteristics, and the 8${\times}$8 dipole array antenna is constructed by the proposed flat dipole for the directional radiation pattern. Besides the vertical power divider is designed for the vertical power distribution. The beam steering control system part is designed the horizontal power divider for the horizontal power distribution, the 4-bit phase shifters and the driving circuit of phase shifters for the horizontal beam tilting. In order to evaluate a performance of the designed antenna systems, they were fabricated and the radiation characteristics were measured. From the measured results, we found that the horizontal beams were tilted by the each control signals, and the measured radiation characteristics showed good agreement with the design goals.

• Journal of Advanced Navigation Technology
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• v.17 no.6
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• pp.646-651
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• 2013

In this paper, a small inverted-F antenna with adjustable characteristics is proposed with use of lumped elements, capacitor and resistor. Capacitor is inserted between end of the antenna and ground for size reduction and tuning of resonant frequency. On the other hand, $0{\Omega}$ resistor is replaced as the short line connected to ground. The movement of short point due to use of $0{\Omega}$ resistor results in providing variation of input impedance. Therefore optimum characteristics can be obtained only by proper choice of capacitor and short point without redesign of it's geometry. In order to check the validity, the proposed antenna is designed and fabricated for 2.4 GHz frequency band, and then is applied to a product of Zigbee wireless remote controller. As a result, the size of applied antenna is $8.5{\times}4.5mm^2$ and it is observed that the measured bandwidth and antenna gain are 150 MHz and 2 dBi respectively without redesign of the antenna.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.24 no.1
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• pp.103-107
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• 2024

This paper is a study on a triangle patch antenna using a rectangle slot and strip conductor. The length and spacing of the slot were adjusted to confirm the characteristics of the triangle patch antenna with rectangle slot, and the area and shape of the radiation patch were changed to triangle, rectangle, and hexagon for impedance matching. The HFSS simulator was used to check the antenna parameter characteristics, and the antenna size was 26 mm ×26 mm. In this proposed antenna, the simulation frequency range with VSWR of 2 or less was 5.27 to 6.24 GHz. The bandwidth was 970 MHz. The frequency range of the fabricated antenna was 5.24 to 6.38 GHz, and the bandwidth 1140 MHz. The maximum radiation gain is 5.01 dBi. It was confirmed that all radiation patterns had directional characteristics.