• Journal of electromagnetic engineering and science
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• v.5 no.3
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• pp.122-125
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• 2005

This paper describes a design of a miniature patch antenna and its 4-channle array for 5.25 GHz wireless LAN band. Each patch element is designed for the low mutual coupling between each element and for the small size of the array antenna. The size of the each element is $7 mm{\times}14.5 mm{\times}5.6 mm$ and it satisfy IEEE 802.11a frequency band. It is arrayed for independent 4-channel operation. The total size of the array antenna is $35.6 mm{\times}52.5 mm{\times}5.6 mm$. The measured reflection coefficients and the radiation patterns of the fabricated antennas show the reasonable agreements with prediction.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.5
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• pp.1294-1303
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• 1996

In this paper, the microstrip anntenna with broad bandwidth is designed using parasitic element. In the designed cofiguration, parasitic element of the same resonating length but different width which is coupled to the nonradiating edge of a rectangular patch antenna. The driven element aloe is fed and the other part is operated as parasitic element. So the different patchs are resonating at differnt frequencies and this multiple resonance increase the bandwidth. The overall size of the antenna is not increased by adding parasitic element to a driven patch. Compared to the available wideband microstrip antennas, the designed antenna structure is bery compact. A theoretical explanation of the rectangular patch antenna coupled with prarsitic is analyzed by extending the theory of coupled microstrip lines. The theoretical and experimental results for a patch coupled with a single parasitic are presented.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.1 no.2
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• pp.131-136
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• 1997

In this paper, the input impedance of coaxial fed rectangular microstrip patch antenna located inside rectangular waveguide is calculated by using the cavity model and the mode excited in the waveguide by the patch antenna. The return loss and efficiency of the patch antennas as a function of feed position in. free space and in waveguide are calculated and compared. The maximum efficiency of the antennas in waveguide and in free space are obtained at different feed position.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.2
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• pp.143-151
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• 2010

In this paper, a novel rectangular patch antenna is proposed to have Zeroth Order Resonance(ZOR) generated based on the Metamaterial Complosite Right- and Left-Handed(CRLH) structure. Making the in-phase electric field over the entire antenna other than a half-wavelength as the fundamental resonance mode of a standard microstrip patch or its positive multiple, the metallic patch is suggested to be capacitively coupled with only one surrounding rectangular ring, different from the previous 1D ZOR antennas commonly having several metal cells in line. The performance of the proposed antenna is simulated by a 3D field solver that inputs the sizes of the physical structure corresponding to the equivalent circuit designed to have ZOR at 2.4 GHz. Consequently, the resonance frequency, the gain and the antenna efficiency are observed 2.4 GHz, 5 dB and 98%, respectively. Besides, the important property of the proposed antenna is addressed as the combination of the low profile as an advantage of microstrip patch antennas, and the omni-directional field pattern typical of monopole antennas.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.3
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• pp.304-310
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• 2008

Generally U-slotted patch antenna with PEC(Perfect Electric Conductor) ground plane is used for mobile telecommunication. However the improvement of the bandwidth is required to enlarge the capability of mobile telecommunication, In this paper, U-slotted patch antenna with EBG(Electromagnetic Band-Gap) ground plane is proposed to enlarge thr bandwidth and its radiation characteristics are investigated. To conform the bandwidth improvement, two kinds of U-slotted patch antennas with EBG and PEC ground plane are designed, fabricated, and radiation characteristics are measured. It is shown that the proposed antenna is wider than U-slotted patch antenna with PEC ground plane in bandwidth.

• ETRI Journal
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• v.30 no.5
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• pp.723-728
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• 2008

In this paper, a simple transmission line model for an edge-coupled patch antenna is presented. The coupled section is modeled with a lump network which represents the mutual admittance between patches and from patch to ground. Theoretical analysis of two edge-coupled patch antenna models are compared by simulation and experiment in antennas designed to operate at the 2 GHz band. The proposed model predicts the return loss of the antenna accurately.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.183-186
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• 2002

In this paper, a microstrip Patch antenna with the T-shaped slits, which are employed to reduce the patch size. is proposed for GPS In order to analyze characteristics of the antennas are defined green function of the moment method. The microstrip Patch antenna and microstrip Patch with the T-shaped slits are fabricated. The numerical result of return loss and -10d13 bandwidth are compared with measured results.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.10
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• pp.67-73
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• 2010

In this paper, the effect of a finite substrate on the mutual coupling of a pair of microstrip patch antennas along the H -plane is investigated. The mutual coupling of a pair of microstrip patch antennas can be reduced using the interference effect due to the phase difference by a variety of routes of the surface wave. In the case of the substrate with $\varepsilon_r$=10 and thickness of 3.2 mm, the mutual coupling is reduced by 4.85 dB on the substrate size with the strong mutual coupling, while the mutual coupling is reduced by 34.28 dB on the substrate size with the weak mutual coupling when the distance between the antenna centers is varied from 0.5 $\lambda_0$ to 1.0 $\lambda_0$. In the case of optimization substrate size, the decreasing rate of the mutual coupling with the increase of the distance between the antenna centers is very large. Good agreements between the image method and full wave simulation results are obtained.

• Journal of Korea Society of Industrial Information Systems
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• v.9 no.2
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• pp.74-80
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• 2004

This paper presents analysis and design for Microstrip antennas using FEM (Finite Element Method). For the miniaturization of the antennas, dielectric substrate (ε/sub r/=4.6) and rectangular patch structure are used. The proposed Microstrip antennas are simulated using commercial simulator (HFSS). The results of the simulation are presented and compared with characteristics of each array type. Especial, the proposed antennas can be applied to the design of various communication systems for 2.4 GHz band.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.5
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• pp.97-102
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• 2023

In this paper, we fabricated transmitting and receiving antennas to realize the low cost radar using two receiving antennas and investigated their characteristics. The antennas are designed with MPA(Microstrip Patch Array) structure for the beam concentration in horizon direction and low cost and used Taylor array pattern synthesis to suppress sidelobes. As a results of measurement in the 24GHz ISM band(24.0-24.25GHz), our using band, antenna gains are placed between 15.2 dBi and 16.26 dBi which are satisfied with the design specification of higher than 15dBi and lower than 17dBi. The sidelobes are -13.15 dBc, -13.1 dBc and -12.8 dBc at the operating frequencies of 24.0 GHz, 24.125 GHz and 24.25 GHz repectively, which are satisfied with the specification of lower than -10 dBc.