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문성익,이정란,양두영 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.2
In this paper. design of the antenna feed system for Ku-band is presented by TE_(mn)^(x) mode theory. The antenna feed system consists of diplexer combined with transmitting filter and receiving filter, OMT(Othogonal Mode Transducer) and polarizer. These filters are designed by the insertion loss method which is applied to the mode matching method. Matching elements in the inner waveguide set to reduce mismatching conditions on the discontinuity imposed by T-junction, so that a diplexer is optimized and has the best property. The optimum filter appeared characteristics that reflected power is about -2OdB in the receiving and the transmitting passband. The differential phase shift of the corrugated polarizer combined with OMT achieved 90°±1° within 14.0 - 14.5㎓ frequency-band. The maximum VSWR is only about 1.02 and axial ratio(AR) is about 1.01. The designed feed system has suitably separated between the polarized wave and the frequency bandwidth.
문성익,양두영 濟州大學校 情報通信硏究所 2000 情報通信硏究所論文集 Vol.3 No.-
In this paper. the orthomode transducer of the antenna feed system is analyzed and designed. It consists of combining the common circular waveguide with the two sub-rectangular waveguide. The size of the circular and the rectangular waveguide are WC59. WR62 and the orthomode transducer considered the 13th high-order mode. From the boundary condition for the electromagnetic field. the scattering parameters are derived from the Hybrid electromagnetic mode theory. The computed results are compared with HFSS of 3D simulation tool for the microwave circuits. The results show a good characteristic that the S_(11) and S_(22) are below -15.5dB and S_(33) S_(44) are below -14dB in the range of 14.5~16.5GHz.
MUSIC 알고리즘을 이용한 적응 빔 성형에 관한 연구
문성익,이광식,양두영 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.1
In order to estimate DOA(Direction Of Arrival) of signal, the adaptive beam forming algorithm based on MUSIC(Multiple Signal Classification) is studied and analyzed. The eigenvalues for the signal component and the noise component are obtained from correlation matrix of the received signal by array antenna. The eigenvalues classified the signal components into the noise components decide the power spectrum of the received signal. From the results, DOA is estimated by the signal and noise spatial vector, and the steering beam pattern is found by weight vectors calculated from the spatial vector, effectively.
문성익,이정란,양두영 濟州大學校 工科大學 産業技術硏究所 1998 尖端技術硏究所論文集 Vol.9 No.2
In this paper, design of the antenna feed system for Ku-band is presented by TEmn χ mode theory. The antenna feed system consists of diplexer combined with transmitting filter and receiving filter, OMT( Othogonal Mode Transducer) and polarizer. These filters are designed by the insertion loss method which is applied to the mode matching method. Matching elements in the inner waveguide set to reduce mismatching conditions on the discontinuity imposed by T-junction. so that a diplexer is optimized and has the best property. The optimum filter appeared characteristics that reflected power is about -2OdB in the receiving and the transmitting passband. The differential phase shift of the corrugated polarizer combined with OMT achieved 90° ± 1° within 14.0 - 14.5GHz frequency-band. The maximum VSWR is only about 1.02 and axial ratio(AR) is about 1.01. The designed feed system has suitably separated between the polarized wave and the frequency bandwidth.
김윤영,문성익,허광삼,양두영 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1
In this paper, A down converter to convert RF signal into IF signal is designed at the WLL basestation. It consists of low noise amplifier module and down mixer module. The low noise amplifier module is composed of threestage and a feedback circuit is added in the first-stage low noise amplifier in order to obtain unconditional stability and good flatness. The configuration of the down mixer module is a single-ended type gate mixer. For the good isolation characteristic of each port, a bandpass filter and a lowpass filter are inserted in the input and output port. To design the down converter without the IF power amplifier. it is important to maximize conversion gain. So the down converter of this paper is designed for the purpose of obtaining a high conversion gain. From the results, the IF output power is -12.68dBm when the LO and the RF power level are 7dBm and -80dBm. respectively. Also when the LO power level is 7dBm. PldB is -0.19dBm. and the RF input power range shows 70dB on wide operating range.
양두영,문성익 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2
The DOA(direction of arrival) of DS-CDMA signals for mobile communication environment was estimated using non-parametric algorithm and MUSIC(multiple signal classification) algorithm. The non-parametric algorithm with regularizing sparsity constraints achieved super-resolution and noise suppression. effectively. This algorithm offered the increased resolution and significantly reduced sidelobes compared with MUSIC algorithm. The numerical analysis showed that it can accurately find DOA and improve the detection probability of the multiple signals.