• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.564-566
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• 2012

In this paper, a design method for a compact broadband planar monopole antenna fed by coplanar waveguide (CPW) is studied. The proposed broadband monopole is optimized for terrestrial digital television (DTV) receiving. The monopole is fed by a CPW with 75-ohm characteristic impedance on an FR4 substrate and its size is $100mm{\times}200mm$. A pair of slit is appended for size reduction and an inductive stub is loaded for the impedance matching between the feedline and monopole. The optimized monopole antenna for DTV band (470-806 MHz) is fabricated on an FR4 substrate and tested experimentally to verify the results of this study.

• 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.18 no.8
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• pp.1785-1790
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• 2014

In communication systems, there are various types of microstrip antenna that can be used for many applications. This paper mainly focuses on the simple design of inset fed rectangular microstrip patch antenna to operate at frequency of 2.45 GHz for wireless communication. The study involves using HFSS simulator to design the antenna dimensions and to determine its performance. This antenna is based on a thickness of 1.6mm Teflon substrate with a dielectric constant of approximately 2.2, on one side of the substrate and another side has a ground plane. After simulation, the antenna performance characteristics such as return loss, VSWR, gain, radiation pattern are obtained.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.10
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• pp.1261-1268
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• 2019

In this paper, we present the analysis of a novel monopole antenna with a reflector. The proposed monopole antenna is printed on a TRF-45 substrate, and the reflector, which is positioned near the base of the antenna, is printed on the FR-4 substrate. Positioning the reflector near the base of the antenna was found to suppress current radiation toward the back of the monopole antenna. Comparative analysis of the proposed monopole antenna and a conventional monopole antenna without a reflector revealed that the bandwidths of the antenna with and without a reflector were 2.65 GHz and 2.88 GHz, respectively. Additionally, the antenna without a reflector was observed to have a bi-directional radiation pattern in the E-plane, and an omni-directional radiation pattern in the H-plane. However, only the antenna with a reflector was found to suppress back radiation, and provide non-uniform directional radiation in the E-plane and H-plane.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.8
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• pp.67-78
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• 2009

Radiation characteristics of microstrip patch antennas integrated with mushroom-like EBG structures in all directions and length direction on a substrate with the relative dielectric constant of 10 are systematically analyzed. As the substrate thickness increases, the effect of the surface wave on the input impedance and radiation pattern of a patch antenna increases. The effect of EBG structures on the input impedance of a patch antenna is negligible when the distances between EBG structures and the center of a patch antenna are 0.4 ${\gamma}_0$, 0.2 ${\gamma}_0$ and 0.1 ${\gamma}_0$ for the substrate thickness of 3.2 mm, 1.6 mm and 0.8 mm, respectively. The forward radiation is improved due to the suppression of surface wave when the periods of EBG structures integrated are larger than 2, 2, 3 periods for the substrate thickness of 3.2 mm, 1.6 mm and 0.8 mm, respectively. The effects of EBG structures on the radiation characteristics of a patch antenna integrated with EBG structures in all directions and length direction are similar.

• Proceedings of the IEEK Conference
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• 2000.06a
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• pp.260-262
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• 2000

Printed microstrip antennas are known to have limitations in terms of bandwidth by the presence of the dielectric substrate. In this paper, to overcome these limitations, a broadband microstrip bow-tie antenna which has two dip point for high speed wireless LAN, fabricated on a Taconic substrate is designed and simulated. In simualted results, the return loss is two dip point which is -28.5dB at 5.68GHz and -27dB at 5.85GHz. The bandwidth of this antenna is 8.7％ about VSWR$\leq$2 and 5.9％ about VSWR$\leq$1.5.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2005.11a
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• pp.273-278
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• 2005

The characteristics of the tag antenna are influenced much with the change of the electrical properties of its substrate material, conducting metal-line and the surrounding environments. In this paper, we study the characteristics of tag antenna according to the electrical variations of those substrate materials, metal-line and the surrounding environmental conditions.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.57-60
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• 2003

FZPL antenna have been applied for satellite TV receiver system, radio astronomical observation and so on, because of its flat nature and structural simplicity. Using TLM modeling, numerical simulation was performed for the FZPL antenna which ran be applied for DAB/DMB receiver system. FZPL antenna mounted on dielectric substrate was investigated. As the results, the computed focal length was shorter than the designed one and the received gain was 18dB.

• The Journal of the Korea institute of electronic communication sciences
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• v.4 no.2
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• pp.82-86
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• 2009

In this paper, we have studied on the microstrip antenna for satellite DMB from 2.63 to 2.65 GHz. Microstrip patch antenna was designed using HFSS simulation program and fabricated by FR4 substrate that has substrate thickness of 1.6mm, metal thickness of $17{\mu}m$, and dielectric constant of 4.4, respectively.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.04b
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• pp.164-167
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• 2000

This paper investigated that resonant frequencies of microstrip patch antenna were tunable when piezoelectric materals were used as the antenna substrates. The resonant frequencies of the air-gap antenna using the piezoelectric substrate were able to be controlled by applied AC voltage. The frequency variation of the antenn was great when PZT were applied voltage of the resonant frequency.