• Journal of the Korea Society of Computer and Information
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• v.8 no.2
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• pp.88-96
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• 2003

Microstrip line is one of the most essential elements of microwave and milimeter-wave integrated circuits. And then the frequency dependent characteristics of the microstrip line have previously been analyzed using several frequency domain approaches But the 3-D TLM method presented in this Paper is another independent approaches for obtaining frequency domain results for microstrip line. The structure analysed with this TLM algorithm is step discontinuity microstrip line and the symmetrical condensed node is used. After numerical analysis, the frequency dependent scattering Parameters of a step discontinuity microstrip line have been calculated by Fourier transform of the time domain data. From the time domain TLM numerical results. this numerical analysis is shown to be an efficient method for modelling complicated structure as step discontinuity microstrip line.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.4
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• pp.795-802
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• 2011

In this paper, the detailed design procedure of the Y-junction stripline isolator self-contained the filter circuit in the center conductor in order to maximize attenuations below value of 30 dB at 3rd order harmonics is presented. The HFSS is used to simulate 1.8GHz band isolator and the results are compared with the measurement data. These results confirms that the designed stripline isolator is effective in achieving high attenuation above -30 dB at 3rd order harmonics. And it is obtained that the harmonic band of isolator using the ferrite of 0.16T is moved far from operating frequency more 1.2 GHz than one using the ferrite of 0.12T.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.7
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• pp.1160-1164
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• 2008

This paper presents an wideband stripline balun. And, the proposed balun is composed of one power divider and two phase converters on stripline substrate. The target characteristics of the proposed balun is the combination loss of below -0.05 dB, an amplitude imbalance of ${\pm}0.5\;dB$ and a phase imbalance of $180{\pm}10$ degrees, with the reflection coefficient(S11) of below -10 dB over frequencies ranging from 500 to 1500 MHz. The fabricated balun occupies the area of $12(W){\times}220(L){\times}2.3(T)\;mm3$. Experimental measurement shows that the fabricated balun has an amplitude imbalance of ${\pm}0.7\;dB$, a phase imbalance of $180{\pm}8$ degrees and an insertion loss of about -2 dB with the reflection coefficient(S11) of below -10 dB over frequencies ranging from 500 to 1,500 MHz.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2002.11a
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• pp.100-103
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• 2002

본 논문에서는 무선 인터넷 사업 및 초고속 정보통신 인프라 구축과 관련하여 WRC-2003에서 새롭게 분배하기로 결정된 5GHz대역(5.135~5.35GHz, 5.47~5.725GHz)과 기존의 ISM 대역(5.75~5.85GHz)에 동시에 사용할 수 있는 스트립 라인 급전을 이용한 슬롯 안테나를 설계하였다. 무선통신 시스템의 박형화를 위하여 평면 내장형으로 설계하였으며 안테나의 크기는 5.04$\times$12.55$\times$2.0[mm]이며 FR-4($\varepsilon$$_{r}$=4.6)를 substrate로 사용하였다. 중심주파수 5.749GHz를 중심으로 10㏈ 기준대역폭 28.54%(4.929~6.561GHz)fmf 갖는다. 안테나의 이들은 약 4.2㏈i이다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.8
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• pp.15-27
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• 2008

In this paper, an EBG(Electromagnetic BandGap) resonator antenna with a stripline type FSS(Frequency Selective Surface) superstrate for PCS-band base station antennas is proposed. The characteristics of resonant frequency and -3dB bandwidth of a unit cell of a superstrate are first analyzed by varing several design parameters such as a strip width and a unit cell width in order to design an EBG resonator antenna satisfying the required antenna gain and bandwidth for PCS-band base station antennas. Among various unit cell shapes, strip dipole and stripline are considered and their characteristics are compared. It was found that a resonant length of the EBG resonator antenna becomes smaller when the stripline shape is used and the control of the bandwidth is also much easier. By using the unit cell simulation results, planar and cylindrical EBG resonator antennas at PCS-band are designed.

• Journal of Advanced Navigation Technology
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• v.17 no.6
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• pp.687-692
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• 2013

This paper presents a compact power divider using microstrip-slotline transition technology. By using the microstrip-slotline transition, the ${\lambda}/4$ transmission lines of the divider can be changed to two ${\lambda}/8$ transmission lines in the multilayer structure. In the microstrip-slotline transition, we have used via holes to make a short circuit at the microstrip line and embedded spiral configuration stubs to reduce the electrical length of an open circuit at the slotline end point. For validating the microstrip-slotline technique, we have simulated and implemented the power divider with embedded spiral and via hole configuration circuits at a frequency of 2 GHz. Good agreement between the simulation and the measurement results is obtained at the operating frequency.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.8 s.338
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• pp.41-46
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• 2005

Microstrip open-end and linear resonator are analyzed by method of moment (MoM) taking the entire-domain current distribution, found in literature, along the transverse direction of microstrip line. A transverse correlation function which incorporates permittivity, thickness and width of the line is derived. Numerical examples are investigated and compared with the available other data and methods in order to give the validity of the proposed method. It is found that the proposed method can generate more accurate results than the conventional methods.

• The Journal of the Acoustical Society of Korea
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• v.20 no.3
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• pp.83-90
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• 2001

Conventional SAW duplexer filters employ a 1/4 wavelength transmission line, which causes difficulty in fabrication of the strip line on the package. Its manufacturing process is also complicated, because it needs integrating process of the separate transmitting filter, receiving filter and isolation circuits. This paper concerns development of a new structure of the duplexer filter that has all the transmitting filter, the receiving filter and the isolation circuit as a one chip device. For composition of the duplexer, we design the component SAW ladder filters and the isolation network consisting of lumped inductor and capacitor elements. Performance of the whole duplexer is optimized by the nonlinear multivariable minimization of a proper target function, and the result is compared with that of commercial filters.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2002.11a
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• pp.285-289
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• 2002

In this paper, microstrip line-probe feeding patch array antenna with center frequency 5.8㎓ is designed and manufactured. The microstrip line - probe feeding structure has broadband characteristic and be able to modify the array structure for improving antenna gain. In this result, microstrip line-probe feeding patch array antenna has 17.6% bandwidth and 8㏈i antenna gain, respectively.

• Journal of the Microelectronics and Packaging Society
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• v.5 no.1
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• pp.91-100
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• 1998

본논문에서는 현재 다 핀용 패키지로 주종을 이루고 있는 기존의 PQEP의 성능을 향상시키기 위하여 스트립 라인 배선 구조를 갖는 새로운 PQEP를 제안하였다. 기존의 208 핀 PQFP와 제안한 208핀 PQFP의 전기적 특성을 Ansoft사의 Maxwell TMA사의 Raphael 과 Avanti사의 HSPICE를 이용하여 시뮬레이션하여 비교하였다. 새로운 패키지에서는 신호 선과 파워버스라인을 스트립 구조로 만들고 감결합커패시터를 장착하여 크로스톡 잡음과 스 위칭 잡음을 크게 감소시켰다. 패키지의 리드프레임을 스트립구조로 만들기 위하여 구리가 도포된 유연성 쿠폰을 리드프레임의양측면에 부착하였다. 신호선의 특성 임피던스는 쿠폰의 유전층 두께변화를 조절함으로써 최적화하였고 유전층 두께가 100$\mu$mdlfEo 45$\Omega$의 값을 얻 었다. 시뮬레이션 결과와 측정결과 32개의 소자가 동시에 스위칭하고 전원/접지핀이 전체 리드 수의 33%일 때 동작주파수가 330Mhz됨을 확인하였으며 이는 기존 PQFP의 최대 동 작주파수인 100MHz에 비하여 3배 이상 향상됨을 보였다.