• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.4
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• pp.685-694
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• 2018

In this paper, we designed and fabricated the frequency mixer, which is the core parts of high frequency head in Ku-band tracking radar. To overcome the problem of single-ended and single-balanced resistive structure, we designed the fine-line structure with balanced mixer, to generate IF signal without distortion in L-band, after receiving the RF signal of the Ku-band. The prototype mixer showed a Noise Figure Max of 6.823dB, Gain of 4.1598~4.676dB and Band Pass of 61MHz in 5 Ku-band samples frequency.

• Journal of the Korean Society of Propulsion Engineers
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• v.20 no.1
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• pp.58-68
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• 2016

The propellant mixer for charging of solid rocket motors is one of the most important equipments. For the propellant mixer is export control item, it's hard to purchase it directly from abroad. The Mixer was developed locally to overcome export control which precludes us from import. This paper includes the introduction for general mixers and the process of mixer development progressed by LIGNex1. Finally, The mixer is verified the performance using measurements of clearance between blade-blade and blade-bowl and flow simulation with ADINA.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2001.11a
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• pp.227-230
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• 2001

본 논문은 마이크로파 슈퍼헤테로다인 수신기에서 발생되는 이미지성분을 효과적으로 제거하기위한 Cascode형 FETs구조를 이용한 Ku-Band 이미지 제거용 자기발진믹서을 분석하였다. 자기발진믹서는 두개의 FET에 의해서 동작되며 상위 FET는 유전체공진기에 의해서 발진기로 동작하며, 아래쪽 FET는 믹서로 동작시켰다. 모의실험 결과 초기 게이트바이어스 전압은 $V_{ gsl}$=-0.4V와 $V_{g2}$=-0.4V와 $V_{g2}$V선정 하였으며, 10.75GHz의 발진기 출력은 2.249dBm, 위상잡음은 -137.9dBc/1000KHz, 이미지 제거특성은 약 -26dBc 값을 얻었다.얻었다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 1998.03a
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• pp.297-303
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• 1998

본 논문에서는 게이트 길이 0.25um, 게이트 폭 150um(6 $\times$25)um 인 HEMT를 이용하여 11.7GHz~12.2GHz 대역 위성방송용 수신기의 기본회로를 설계하였다. 수신기는 저잡음증폭기, 믹서, 국부발진기, 중간주파수증폭기로 구성되어 있으며 LO 주파수는 10.75GHz 이고 IF 주파수는 0.95 ~1.45GHz 이다. 수신기의 설계목표는 전체이득 32dB 이상, 잡음지수 2.6dB 이하, 입출력 단의 반사손실은 각각 -10dB, -10dB 이하이며 저잡음증폭기, 믹서 및 중간주파수증폭기의 최소이득 및 최대잡음지수 14dB, 1dB, 믹서는 각각 0dB, 10dB, 중간주파수증폭기는 각각 18dB, 5dB 가 되게 설계하였다. 저잡음증폭기와 중간주파수증폭기는 2단으로 , 믹서는 이중 게이트구조로, 국부발진기는 반사형의 구조로 설계하였다.

• Product Safety
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• no.5 s.149
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• pp.48-49
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• 2006

헤어드라이어의 코드 부근에서 화재가 발생해 카펫의 일부를 태움/오븐렌지의 배기구에서 화재가 발생해 벽을 태움/믹서기 안정성 결여에 의한 어린이 상해배 상 요구

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.6
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• pp.141-147
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• 2008

This paper describes the design of frequency down converting Mixer in the receiver to use compound semiconductor and CMOS product process. The basic theory and structure of frequency down converting Mixer is surveyed, and we design mixer circuit with active balun which use the compound semiconductor and CMOS process. This mixer convert a single ended signal to differential signal at input port of RF and LO instead of matching circuit to get dual band balanced mixer structure and characteristic broadband. This designed mixer has a conversion gain $-1{\sim}-6[dB]$ at $2{\sim}6[GHz]$ bandwidths. However, the simulation of the designed mixer with active balun has the result of a 7[dB] conversion gain for -2[dBm] LO input power and -10[dBm] input P1[dB] at 5.8[GHz].

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.2
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• pp.50-54
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• 2015

In this paper, we report on a high performance 94 GHz MMIC mixer module using 0.1-um metamorphic high electron mobility transistors (MHEMTs). A modified resistive mixer with a RF amplifier was proposed in this work for low conversion loss and high LO-RF isolation. The MMIC mixer module was fabricated using a MMIC chip and CPW-waveguide transitions. The fabricated mixer chip and module showed a low conversion loss of 6.3 dB and 9.5 dB, and LO-RF isolations of 24.8 and 30.4 dB at 94 GHz, respectively. This results are superior to those of previously W-band (75-110 GHz) MMIC mixers.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.8
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• pp.737-743
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• 2004

A fixed-tuned SIS(Superconductor-Insulator-Superconductor) mixer across 120∼180 GHz band has been developed. This mixer employs an SIS chip fabricated by Nobeyama radio observatory which consists of a series array of 6 Nb/Al-Al$_2$O$_3$/Nb junctions in a microstrip line on a fused quartz substrate. The SIS chip is placed at the center of the half-height waveguide mixer mount to have a good incoming signal coupling over the whole frequency band. No mechanical tuner was used in the SIS mixer and the RF signal and local oscillator power are injected to the mixer via a cooled cross-guide coupler. In order to prevent the IF signal loss, the If output impedance of the SIS mixer was matched to the 50 $\Omega$ input impedance of the IF chain. Measured double sideband noise temperatures of a receiver using the SIS mixer are 32∼131 K over 120∼180 GHz band. The developed SIS mixer is now in use for radio astronomical observations on the TRAO 14 m radio telescope.

• Journal of Advanced Navigation Technology
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• v.15 no.1
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• pp.97-103
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• 2011

This paper presents a dual-band balanced mixer using nonlinear phase characteristic of composite right/left-handed (CRLH) transmission line. This metamaterial structure provides low LO leakage and high RF to LO isolation without additional filters for LO and RF path. The balanced mixer consists of balun and Wilkinson divider with dual-band characteristic of unit-cell which behaves like a CRLH metamaterial. Experimental results are used to verify the proposed metamaterial functions. The balanced mixer design results in an operating frequency of 870 MHz and 1660 MHz with an optimum mixer conversion loss of 15.2 dB at 870 MHz and 21.2 dB at 1660 MHz.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.40 no.5
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• pp.197-203
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• 2003

In this paper, we have presented millimeter-wave high conversion gain quadruple subharmonic mixers adopting the cascode harmonic generator The subharmonic mixers were successfully integrated by using 0.1 ${\mu}{\textrm}{m}$ GaAs pseudomorphic HEMTs(PHEMTs) and coplanar waveguide(CPW) structures. Measured output of 1st, 2nd and 4th harmonics of the fabricated cascode 4th harmonic generator are -21.42 dBm, -32.65 dBm and -13.45 dBm, respectively, for an input power of 10 dBm at 14.5 GHz. We showed that the highest conversion gain of 3.4 dB has obtained thus far at a LO power of 13 dBm from the fabricated subharmonic mixers. The millimeter-wave subharmonic mixer also ensure a high degree of isolation showing -53.6 dB in the LO-to-IF and -46.2 dB in the LO-to-RF, respectively, at a frequency of 14.5 GHz. The high conversion gain achieved in this work is the first report among the millimeter-wave subharmonic mixers.