• Journal of the Institute of Electronics Engineers of Korea TC
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• v.37 no.3
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• pp.35-42
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• 2000

A cross-shaped microstripline-fed printed slot antenna having wide bandwidth Is presented in this paper. The proposed antenna is analyzed by using the Finite-Difference Time-Domain (FDTD) method. It was found that the bandwidth of the antenna depends highly on the length of the horizontal and vertical feedline as well as the offset position of the feedline. The maximum bandwidth of this antenna is from 1.975 GHz to 4.725 GHz, which is approximately 1.3 octave, for the VSWR $\leq$ 2. Experimental data for the return loss and the radiation pattern of the antenna are also presented. and they are in good agreement with the FDTD results.e FDTD results.

• Journal of electromagnetic engineering and science
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• v.11 no.4
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• pp.257-261
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• 2011

A highly efficient 2.4 GHz rectenna is designed using a harmonic rejection bandpass filter. The rectenna is printed on Rogers Duroid 5880 substrate with ${\varepsilon}_r$=2.2 and a thickness of 1.6 mm. The rectenna consists of a microstrip antenna and high order harmonic rejection bandpass filter, microstrip lowpass filter, and Schottky barrier diode (HSMS2820). The use of a $2^{nd}$ and $3^{rd}$ harmonic rejection microstrip bandpass filter in the rectenna results in high conversion efficiency. The proposed rectenna achieves a RF to DC conversion efficiency of 72.17 % when the received RF power is 63.09 mW.

• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1613-1614
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• 2006

In this paper, a $4{\times}4$ rectangular patch array antenna operated at 20 GHz is implemented for the satellite communication. Two $2{\times}2$ subarrays are designed and more efficient $2{\times}2$ subarray is used for the design of $4{\times}4$ patch array. The sixteen patch antennas and microstrip feeding line are printed on the single-layered substrate. The spacing between the array elements is chosen to be $0.736{\lambda}$. HPBW (Half-Power Beam Width) is 17.6 degrees in the E-plane and 18.7 degrees in the H-plane with a gain of 17.2SdBi in the simulation results.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.252-252
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• 2006

• Proceedings of the KAIS Fall Conference
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• 2004.06a
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• pp.203-205
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• 2004

본 논문에서는 휴대용 무선기기에 응용 될 수 있는 이중대역 무선랜 안테나가 소개되었다. 소개된 디자인은 두개의 방사부를 가지는 1/4파장 안테나를 모델로 개발되었다. 수치해석 결과에 따라 견본안테나가 제작되었고 최적의 특성을 얻기 위해 몇 번의 수정을 거친 후에 본 논문에서 제안된 안테나가 제작되었다. 본 논문에서 제안된 안테나는 2.4/5GH 주파수 대역에서 동작하고 주로 노트북PC에 장착되어 사용 될 수 있다. 제시된 모든 결과들은 실제 실험용 노트북PC에 장착된 상태에서 얻어진 것이다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.1
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• pp.75-80
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• 2003

This paper presents novel compact circularly polarized(CP) operation of a annular ring slot antenna with a 45$^{\circ}$truncated in the patch and a cross-slot of unequal slot lengths. A simple configuration based on a cross-slot of unequal slot lengths on the annular ring patch is adopted to realize a small-size element antenna and used a proximity coupled feed method. Experimental results show that much wider impedance bandwidth of 7.74 % and axial ratio bandwidth of 1.9 % in GPS band(1.5 GHz).

• Journal of electromagnetic engineering and science
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• v.13 no.1
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• pp.44-50
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• 2013

In this paper, we present a circularly polarized (CP) composite cavity-backed crossed dipole antenna for global positioning system (GPS) applications. We produce the CP radiation by crossing two dipoles through a $90^{\circ}$ phase delay line of a vacant-quarter printed ring, which also has a broadband impedance matching characteristic. Two techniques, insertion of meander lines in the dipole arm and arrowhead-shaped trace at its end, are employed to reduce the sizes of the primary radiation element. The compact radiator is backed by a cavity reflector to achieve a wide CP radiation beamwidth. The proposed antenna exhibits a measured bandwidth of 1.450~1.656 GHz for a voltage standing wave ratio (VSWR) < 2 and 1.555~1.605 GHz for AR < 3-dB. At 1.575 GHz, the antenna has a gain of 7 dBic, a frontto-back ratio of 27 dB, AR of 1.18 dB, and 3-dB AR beamwidths of $130^{\circ}$ and $132^{\circ}$ in the x-z and y-z planes, respectively.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.3 no.2
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• pp.305-311
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• 1999

In this paper, it is designed a new type single layer patch antenna which is printed on a very thin film and separated from the ground-plane by foam with a low permitivity of 1.06 and a high thickness of around quarter wavelength. It allows the use of three-dimensional transition, from one level to another, so that its bandwidth can be enhanced by wideband impedance matching. The radiation pattern, return loss, and VSWR of the antenna are calculated using "IE3D" simulation package, and compared with the experimental results. Experimental results show that the bandwidth is about 65% of center frequency 6.8 GHz, return loss and VSWR are in a fairly good agreement with the calculations.culations.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.10
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• pp.2615-2618
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• 2009

Double rectangular patch with 4-bridges is investigated for solution of IEEE 802.11b/g (2.4 GHz) and 802.11a (5.5 GHz). Rectangular patch for 5.5 GHz frequency band is printed on the PCB substrate and connected to another rectangular patch for 2.4 GHz frequency band with 4-bridges to obtain dual band operation in an antenna element. 4-bridges can modify the desired frequency band from its original frequency band by changing its width. Gain of 2.4 GHz patch is 5 dBi and 5.5 GHz patch is 3.7 dBi at ${\theta}=0^{\circ}$.

• 한국정보통신설비학회:학술대회논문집
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• 2006.08a
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• pp.193-196
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• 2006

In this paper, two $4{\times}4$ rectangular patch array antennas operated at 20 GHz are implemented for the satellite communication. Two $2{\times}2$ sub-arrays are designed and used for the design of $4{\times}4$ patch array. The sixteen patch antennas and microstrip feeding line are printed on the single-layered substrate. The spacing between the array elements is chosen to be $0.736{\lambda}$. The HPBW(Half Power Beam Width) of the $4{\times}4$ microstrip patch array is 17.01 degrees in the E-plane and 17.71 degrees in the H-plane with a gain of 11.6dB in the experimental results. The HPBW of the recessed $4{\times}4$ microstrip patch array is 18.66 degrees in E-plane and 17.12 degrees in the H-plane with a gain of 12.55dB in the experimental results.