Network Parameters of 6-Pole Dual-Mode Singly Terminated Elliptic Function Filter

Lee, Juseop,Uhm, Man-Seok,Yom, In-Bok,Lee, Seong-Pal 한국통신학회 2003 韓國通信學會論文誌 Vol.28 No.7A

An output multiplexer of manifold type is widely used in a recent satellite transponder for its mass and volume reduction. For correct operation, the filters of such a multiplexer must be singly terminated. In this paper, a simple synthesis method of a 6-pole dual-mode singly-terminated filter is described. From the transfer function of the filter, network parameters such as in/output terminations and coupling coefficients are obtained easily without complicated matrix algebra such as orthogonal projection and similarity transformation. Two different-structure filters are taken into consideration and the network parameters of each filter have been extracted from the same transfer function. It is shown that the responses of two filters are same to each other since their network parameters are obtained from the same transfer function. The method described in this paper can be applied to the other degree singly terminated filter.

X-band 송수신 모듈을 위한 높은 감쇠 정확도와 작은 위상 변동을 가진 6 비트 MMIC 디지털 감쇠기

주인권,염인복,이정원,이수호,안창수,김선주,박동운,오승엽,Ju, In-Kwon,Yom, In-Bok,Lee, Jeong-Won,Lee, Soo-Ho,Ahn, Chang-Soo,Kim, Sun-Joo,Park, Dong-Un,Oh, Seung-Hyeup 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.4

A 6-bit MMIC digital attenuator applicable to X-band TR module has been developed by using $0.5{\mu}m$GaAs pHEMT processes. The Switched-T attenuator scheme and the switched-path attenuator scheme were adopted to obtain low insertion loss and small phase variation, respectively. Resistors and transmission lines are optimized to achieve the digital attenuator with high attenuation accuracy and small phase variation. The digital attenuator has RMS error of 0.4dB, resolution of 0.5dB and dynamic range of 31.5dB. The measurement results show that in-out VSWRs are less than 1.5, phase variation is from -7 to +2 degrees and IIP3 is 36.5dBm.

Phase-noise reduction of voltage-controlled dielectric resonator oscillator for the X-band

Yom, In-Bok,Shin, Dong-Hwan,Ryu, Keun-Kwan,Oh, Seung-Hyeub,Lee, Moon-Que Wiley Subscription Services, Inc., A Wiley Company 2005 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.47 No.6

<P>A different approach for phase-noise reduction of a HEMT VCDRO (voltage-controlled dielectric resonator oscillator) with coupled microstriplines to tune the oscillating frequency is investigated. Two HEMT VCDROs of 9.8 GHz are manufactured in the same configuration, except for the frequency-control circuit, in order to empirically demonstrate the phase-noise reduction. The experimental results show that the phase-noise reduction can be enhanced 8 dBc/Hz at 100-KHz offset frequency by using a frequency-controlled circuit with coupled microstriplines, as compared to the conventional VCDRO. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 515–518, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21215</P>

The Development of LNA for Ka-Band Communication Payload in ETRI

In Bok Yom,Jong Sik Lim,Sung Choon Kang,Jae Moung Kim 대한전자공학회 1998 대한전자공학회 세미나 Vol.1998 No.-

An Active IF Balun for a Doubly Balanced Resistive Mixer

Jin-Cheol Jeong,In-Bok Yom,Kyung-Whan Yeom IEEE 2009 IEEE microwave and wireless components letters Vol.19 No.4

<P>In this letter, we present a wideband active intermediate frequency (IF) balun for a doubly balanced resistive mixer implemented using a 0.5 mum GaAs pHEMT process. The 0.3 times 0.5 mm<SUP>2</SUP> IF balun was realized through a DC-coupled differential amplifier in order to extend IF frequency of the mixer to DC. The measured amplitude and phase imbalances were less than 1 dB and 5deg, respectively, from DC to 7 GHz. The output third order intercept (OIP3) and P1 dB of the IF balun were 18 dBm and 6 dBm, respectively at 1 GHz. The mixer with the IF balun is 1.7 times 1.8 mm<SUP>2</SUP> in size, has a conversion loss of 2 to 8 dB from 8 to 20 GHz RF frequency at a fixed IF of 1 kHz, which proves the mixer operates successfully at an IF frequency close to DC. The measured OIP3 were +10 to +15 dBm over the operating frequency with a DC power consumption of 370 mW.</P>

MMICs for the COMS(Communication, Ocean and Meteorological Satellite) Ka Band Communications Transponder

Yom, In-bok,Chang, Dong-pil,Shin, Dong-hwan,Oh, Seung-hyeup 통신위성우주산업연구회 2005 Joint Conference on Satellite Communications Vol.2005 No.-

본 논문에서는 통신해양기상위성 Ka 대역 위성통신중계기에 사용하기 위해 개발한 MMIC 에 대해 다루었다. Ka 대역 위성중계기 구성부품들의 무게 및 크기를 줄이는 한편, 안정적인 성능과 신뢰성을 확보하기 위해 총 12 종의 MMIC 가 개발되었다. 수신기에 사용하기 위해 2 종의 30 GHz 대역 저잡음 MMIC 증폭기, 주파수하향변환기 초단 중전력증폭기 MMIC 와 Mixer MMIC, 8GHz 의 국부주파수를 3 체배하기 위한 Tripler MMIC 및 변환된 3GHz 중간주파수 대역의 신호를 증폭하는 중전력증폭기 MMIC 등이 개발되었으며, 위성 빔간 스위칭을 위한 스위치 매트릭스를 구성하기 위해 SPST MMIC switch 가 개발되었다. 스위칭된 주파수를 하양주파수 대역으로 변환하기 위한 upconverter 용으로 주파수 상향변환 Mixer MMIC 그리고 8GHz 대의 국부주파수를 2 체배하기 위한 Doubler 가 개발되었으며, 채널증폭기에 사용되기 위해 20 GHz 대역의 저잡음 구동 증폭기와 또 다른 20 GHz 대역 구동증폭기 MMIC 및 채널 이득 조절을 위한 가변 Attenuator MMIC 가 개발되었다. 이들 MMIC 중 수신기 초단에 사용되는 MMIC 의 잡음지수는 30GHz 에서 1.7dB 이며, 스위칭용 스위치 MMIC 는 60 dB 이상의 채널간격리도를 제공하며, 가변 Attenuator 는 30 dB 이상의 선형 이득 조절 범위를 제공한다. 이들 MMIC 는 NGST 사의 $0.15\mum$ 의 게이트 길이를 갖는 pHEMT 공정을 이용하여 제작되었으며, 우주인증을 위하여 우주레벨 Visual Inspection 을 마쳤으며, 현재 Burn-in 시험을 수행중에 있다. This paper describes the MMICs developed for the Ka band satellite transponder for the COMS(Communication, Ocean and Meteorological Satellite). Total 12 MMICs were developed for the Ka band transponder equipment to secure not only reliable and stable performances but also light and compact size. For the receiver, two 30 GHz low noise MMIC amplifiers, a 30 GHz driver amplifier, a 30/3GHz frequency down-conversion MMIC mixer and a 9/27 GHz MMIC frequency tripler were developed. A 3 GHz SPST MMIC switch was developed for on-board beam switching function. For the frequency upconverter, a 3 GHz medium power MMIC amplifier, a 3/20 GHz frequency up-conversion MMIC mixer and an 8/16 GHz MMIC doubler were developed and for the channel amplifier, a 20 GHz low noise MMIC amplifier and a 20 GHz variable MMIC attenuator were developed. Specially, the 30 GHz low noise MMIC amplifier at the receiver front-end exhibits 1.7dB of noise figure, and the 3GHz SPST MMIC switch shows 60 dB of on-off isolation to secure high isolation between the signal paths, and the 20 GHz variable MMIC attenuator provides about 30 dB of dynamic gain control ranges. These MMICs were fabricated by using the NGST $0.15\mum$ GaAs pHEMT facility. The fabricated MMICs had been visually inspected according to the space level quality assurance program and currently under burn-in test.

High Output Power and High Fundamental Leakage Suppression Frequency Doubler MMIC for E-Band Transceiver

In-bok Yom,Dong-Pil Chang 한국전자파학회JEES 2014 Journal of Electromagnetic Engineering and Science Vol.14 No.4

An active frequency doubler monolithic microwave integrated circuit (MMIC) for E-band transceiver applications is presented in this letter. This MMIC has been fabricated in a commercial 0.1- ㎛ GaAs pseudomorphic high electron mobility transistor (pHEMT) process on a 2-mail thick substrate wafer. The fabricated MMIC chip had been measured to have a high output power performance of over 13 dBm with a high fundamental leakage suppression of more than 38 dBc in the frequency range of 71 to 86 GHz under an input signal condition of 10 dBm. A microstrip coupled line is used at the output circuit of the doubler section to implement impedance matching and simultaneously enhance the fundamental leakage suppression. The fabricated chip is has a size of 2.5 mm X 1.2mm.

Engineering Verification of the RF Active Equipment for the COMS(Communication, Ocean and Meteorological Satellite) Ka band Communications Transponder

Yom, In-bok,Jang, Dong-Pil,Park, Jong-Heung,Oh, Seung-Hyeup 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-

본 논문에서는 통신해양기상위성 Ka 대역 위성통신중계기에 사용하기 위해 개발 중인 능동부품의 기술 검증 결과에 대해 다루었다. 위성통신중계기의 수신주파수는 30GHz 대역이며, 수신주파수는 빔간 스위칭을 위해 3GHz 대역으로 하향변환된 뒤 지구국으로 송신을 위해 다시 20GHz 대역으로 상향변환된다. 따라서 성능 검증을 위해 개발되는 부품으로는 30GHz 저잡음증폭기, 30GHz/3GHz 주파수하향변환기, 스위치매트릭스, 3GHz/20GHz 주파수 상향변환기 및 채널 증폭기 등이 있다. 이들 부품은 소형, 경량, 및 성능의 안정화를 위하여 스위치매트릭스를 제외하고는 모두 MMIC 기술을 적용하여 설계하였다. 제작 및 측정 결과, LAN 의 잡음지수는 상온에서 2.0dB 이고, 크기는 50mm$\times$35mm$\times$20mm 이었다. 주파수 하향변환기는 30GHz 의 신호를 3GHz 대역으로 변환하기위하여 8GHz 대의 국부발진기 신호를 3 체배하였고, 주파수상향변환기는 3GHz 대역의 신호를 20GHz 대역으로 변환하기 위하여 8GHz 대의 국부발진신호를 2 채배하였으며, 하나의 하우징에 이중화로 구현하였다. 스위치 매트릭스는 pin-diode 스위치 및 전력 결합/분배 기술을 이용하여 4$\times$4 배열 구조로 구현하였다. 채널 증폭기는 최대 53dB의 이득을 가지며, MMIC 감쇠기를 이용하여 32dB 의 이득 조절범위와 20dB 의 ALC 범위를 갖도록 구현하였다. 부품 성능 검증에 추가하여 향 후 기계적/열적 분석 및 각종 환경 분석을 수행하여 성공적인 비행 모델 개발이 가능하도록 할 예정이다. This paper describes the engineering verification of the active RF equipment that consists of the Ka band satellite transponder for the COMS(Communication, Ocean and Meteorological Satellite). The COMS communications transponder receives 30 GHz signals and down-converts to 3 GHz for beam switching and then up-converts to 20 GHz for transmitting to ground. Therefore a 30 GHz LNA, 30/3 GHz Downconverter, 3GHz Switch matrix 3/20 GHz Upconverter and Channel amplifier have been developed for the performance verification. These are designed by using MMIC technology to reduce size and mass, and to secure high stable performances. The LNA shows 2.0 dB noise figure with the compact size of 50 mm $\times$ 35 mm $\times$ 20 mm. The Downconverter triplicates the 8 GHz from DRVCO type LO for downconverting 30 GHz signal to 3 GHz and the Upconverter doubles the 8 GHz signals for upconverting 3 GHz signals to 20 GHz. Each frequency converter has a redundant chain in one housing. The Switch matrix has 4 $\times$ 4 arrays composed by pin-diode switches and power combiners/dividers. The Channel amplifier has a32dB commandable gain control range and 20 dB automatic level control range to use transponders at optimum operating condition. In addition to engineering verification of the RF active equipment, Thermal/Mechanical analysis and the oyher environmental analysis shall be performed to secure successful development of the flight model equipment.

Development of the RF Equipment for the COMS(Communication, Ocean and Meteorological Satellite) Communications Payload

In Bok Yom(염인복),Jong Heung Park(박종흥),Seung Hyeup Oh(오승엽) 한국통신학회 2004 한국통신학회 학술대회논문집 Vol.2004 No.11

Push-push voltage controlled dielectric resonator oscillator using a LTCC technology

Yom, In-Bok,Shin, Dong-Hwan,Oh, Seung-Hyeub,Ryu, Keun-Kwan Wiley Subscription Services, Inc., A Wiley Company 2007 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.49 No.8

<P>A push–push voltage-controlled dielectric resonator oscillator (VCDRO) with a modified frequency tuning structure is investigated. The push–push VCDRO designed at 16 GHz is manufactured using a low temperature cofired ceramic (LTCC) technology to reduce the circuit size. The frequency tuning structure is embedded in a layer of A6 substrate by an advantage of LTCC process. Experimental results show that the fundamental frequency suppression is above 30 dBc, and a phase noise of push–push VCDRO presents a good performance of −103 dBc/Hz at 100 kHz offset frequency from carrier. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1824–1827, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22619</P>