• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 I
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• pp.302-305
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• 2003

In this paper, a feedline which is a shape of a fork is designed to improve a bandwidth of the microstrip slot antenna. To determine design parameters of the feedline, the characteristics of the microstrip slot antenna is analyzed by changing design parameters of the feedline. The microstrip slot antenna with the feedline of a shape of a fork has a wide band, from 1.7 GHz to 6.1 GHz for VSWR $\leq$2.

• 한국IT서비스학회지
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• 제12권3호
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• pp.323-330
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• 2013

In this paper, miniaturized patch antenna operating at ISM band has been designed by applying the fractal technique. Various type of antenna structure, microstrip patch antenna and koch curve microstrip patch antenna has been proposed and simulated using Ansoft HFSS (High Frequency Structure Simulator). The area of microstrip patch antenna and koch microstrip patch antenna is 1,058 $mm^2$, and 891 $mm^2$ respectively, showing the size reduction ratio of 16%. The finally made koch curve microstrip patch antenna resonates at 2.45GHz with return loss of 22.69dB, VSWR of 1.2142, and antenna radiation gain of 3.26dBi.

• Journal of information and communication convergence engineering
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• 제10권2호
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• pp.123-128
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• 2012

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 an inset rectangular microstrip patch antenna to operate at a frequency of 2.45 GHz for rectenna design. The study involves using an high frequency structure simulator to design the antenna dimensions and to determine its performance. This antenna is based on a thickness of 1.6 mm flame retardant 4 (FR-4) substrate having a dielectric constant of approximately 4.7, an inset feed, and a ground plane. After simulation, the antenna performance characteristics such as its return loss, voltage standing wave ratio, gain, and radiation pattern were obtained and compared with the fabricated measured antenna.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.224-225
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• 2005

The microstrip patch antenna with PVDF (poly vinylidene fluoride) substrate, were experimentally studied at frequency 6 GHz. During the design of the essential elements of microstrip antenna, EM simulation tool Ensemble V 7.0 is used. We observed the resonant frequency by DC appled electric field in a microstrip patch antenna. This research has been made as an electronically tunable microstrip antenna, taking advantage of the voltage control dielectric substrate and piezoelectric properties substrate. We discuss the effect of substrates, electric field and piezoelectric phenomena in the PVDF microstrip antenna. The antenna frequency can be changed by varying the applied dc voltage. In this paper, we propose, a new technique to agile frequency of the microstrip antenna by using the PVDF piezoelectric substrate.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.163-166
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• 2000

The design, numerical simulation, and an experimental implementation of two-element cross-shaped microstrip line-fed printed slot array antenna for IMT-2000 at the 2.0 GHz band is presented in this paper. The proposed antenna with relative permittivity 4.3 and thickness 1.0mm is analyzed by the Finite-Difference Time-Domain (FDTD) method. It was shown that the measured 2.0 VSWR bandwidth of one-element microstrip slot antenna is from 1.42 GHz to 2.69 GHz, which is approximately 61.8% and that of two-element microstrip slot array antenna is from 1.42 GHz to 2.56 GHz, which is approximately 57.3% And it was shown that the measured gain of one-element microstrip slot antenna is 2.75 dBi and that of two-element microstrip slot antenna is 4.75 dEi. The antennas were fabricated and tested. The measured results are in good agreements with the FDTD results.

• 한국콘텐츠학회논문지
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• 제6권2호
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• pp.99-104
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• 2006

이 논문은 GPS 안테나로 사용될 수 있는 Offset Slotted 직사각형 마이크로스트립 패치 안테나를 디자인하기 위한 기법을 제안하였다. 안테나 특성을 해석하기 위해 Multi-port connection 기법과 Desegmentation 기법을 사용하였고, 고유전율의($\varepsilon_{\gamma}$=10.2) 기판과 직사각형 슬롯을 이용하여 안테나의 사이즈를 줄일 수 있었다. 제작된 안테나의 치수는 $20\times30\times1.27$[mm]로 작은 사이즈이므로 GPS 안테나 또는 핸드폰에 사용될 수 있을 것이다.

• 대한전기학회논문지:시스템및제어부문D
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• 제54권3호
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• pp.180-185
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• 2005

Microstrip antennas generally have a lot of advantages that are thin profile, lightweight, low cost, and conformability to a shaped surface application with integrated circuitry. In addition to military applications, they have become attractive candidates in a variety of commercial applications such as mobile satellite communications, the direct broadcast system (DBS), global positioning system (GPS), and remote sensing. Recently, many of the researches have been achieved for improving the impedance bandwidth of microstrip antennas. The basic form of the microstrip antenna, consisting of a conducting patch printed on a grounded substrate, has an impedance bandwidth of $1\~2\%$. For improvement of narrow bandwidth of microstrip patch, we were designed U-slot microstrip patch antenna in this paper. This antenna had wide bandwidth for all personal communication services (PCS) and IMT-2000. For the design of U-slot microstrip patch antenna using a finite difference time domain(FDTD) method. This numerical method could get the frequency property of U-slot patch antenna and the electromagnetic fields of slots.

• 한국통신학회논문지
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• 제14권5호
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• pp.435-441
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• 1989

링 급전 선로를 이용해서 두 slot 사이 공진 길이를 lambda/2혹은 로 한 한 3개의 Rectangular Microstrip Patch Antenna를 배열하고 제작하여 방사 패턴 특성을 고찰 했다. 링 급전 선로를 이용한 공진길이 lambda/2인 3개의 Rectangular Microstrip Patch Antenna의 경우 각 Patch Antenna 소자 방향에서 방사 패턴이 고찰되고, 공진 길이 lambda/인 3개의 Rectangular Microstrip Patch Antenna의 경우 각 Antenna소자 사이에서 방사 패턴이 고찰 되었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1664-1667
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• 2003

Aperture-coupled microstrip antenna is one type of microstrip antennas. This type of antenna has bandwidth wider than simple microstrip antenna. Herein, we use two substrates, that have the same dielectric constant 2.47 (PTFE-quartz) in which upper substrate is a rectangular patch. The microstrip patch is fed by a microstrip line which is printed on lower substrate, through an aperture or slot in the common ground plane of patch and microstrip feed. This antenna is analyzed by using Finite Difference Time Domain (FDTD) method the specific design frequency 10 GHz and match impedance is 50 ohms. The simulation results of its characteristics are input impedance, return loss, VSWR and radiation patterns respectively.

• 한국컴퓨터정보학회논문지
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• 제22권4호
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• pp.67-74
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• 2017

The objective of this paper is to design broadband microstrip patch antenna for mobile communication service. The enhanced features were confirmed and proved by comparing the proposed antenna with the antennae that have been reported in the relevant literatures. The experimental results show that the impedance bandwidth(VSWR ${\leq}2$) of 19.6%(fo=1,920MHz) and the peak gain of 5.53dBi(at 1,900MHz) were obtained by the mobile communication service frequency band. The proposed antenna had the impedance bandwidth of about 3.1% larger than that of the reported microstrip antenna.