• Title/Summary/Keyword: RF design

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See-saw Type RF MEMS Switch with Narrow Gap Vertical Comb

  • Kang, Sung-Chan;Moon, Sung-Soo;Kim, Hyeon-Cheol;Chun, Kuk-Jin
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.7 no.3
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    • pp.177-182
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    • 2007
  • This paper presents the see-saw type RF MEMS switch based on a single crystalline silicon structure with narrow gap vertical comb. Low actuation voltage and high isolation are key features to be solved in electrostatic RF MEMS switch design. Since these parameters in conventional parallel plate RF MEMS switch designs are in trade-off relationship, both requirements cannot be met simultaneously. In the vertical comb design, however, the actuation voltage is independent of the vertical separation distance between the contact electrodes. Therefore, the large separation gap between contact electrodes is implemented to achieve high isolation. We have designed and fabricated RF MEMS switch which has 46dB isolation at 5GHz, 0.9dB insertion loss at 5GHz and 40V actuation voltage.

Review on RF Performance of Ultra Wide Band Device

  • Lee, Il-Kyoo;Kang, Bub-Joo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.2
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    • pp.34-39
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    • 2007
  • UWB(Ultra Wide Band) system for high speed and high accurate location has been studying actively. This paper presents the design and implementation of RF transceiver for DS-CDMA(Direct Sequence-Code Division Multiple Access) UWB device. Major components of RF transceiver such as Low Noise Amplifier(LNA) and Band Pass Filter(BPF) are designed and then fabricated to meet wideband characteristics. The RF transceiver was implemented by the use of the fabricated components and commercial devices after carrying out performance simulation. Through the performance evaluation of the UWB RF transceiver with W-CDMA signal, the approach of design, implementation and evaluation of RF transceiver which is available to DS-CDMA UWB system is verified.

Study of Design and Fabrication on the RF-Switch (RF-SWITCH의 설계 및 제조에 관한 연구)

  • 이재영
    • Journal of the Microelectronics and Packaging Society
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    • v.5 no.2
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    • pp.49-52
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    • 1998
  • 이동통신용 핵심 부품인 W-LAN용 RF-Switch를 설계 및 제작하였다. 본 연구에서 는 CAD를 이용한 전송선로 설계기술, 소형화, 다층화 설계기술, 이동통신용 MCM 부품의 패턴설계를 개발하였으며 RF-Switch 설계하는기법 소형화 및 다층화를 위한 MCM공법을 얻을수 있었다. Ant-Rx On시 삽입손실은 0.48dB로 나타났다.

Ultra-Low Power MICS RF Transceiver Design for Wireless Sensor Network (WSN 을 위한 초저전력 MICS RF 송수신기 기술 개요 및 설계 기법)

  • Gyu-won Kim;Yu-jung Kim;Junghwan Han
    • Transactions on Semiconductor Engineering
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    • v.2 no.1
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    • pp.9-16
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    • 2024
  • This paper discusses the design of bio-implanted ultra-low-power MICS RF transceivers for wireless sensor networks. The 400 MHz MICS standard was considered for the implementation of the WBAN wireless sensor system, indirectly minimizing radio propagation losses in the human body and the inference with surrounding networks. This paper includes link budget, various transmission and reception architectures for a system design and ultra-low power transceiver circuit techniques for the implementation of RF transceivers that meet MICS standards.

Design of a RF power amplifier using distributed network syntheses (분포정수 회로합성을 이용한 RF 전력 증폭기 설계)

  • Kim Nam-Tae;Lee Min-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.7 no.4
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    • pp.602-607
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    • 2006
  • In this paper, the distributed network synthesis, which is useful to the design of wireless power amplifiers, is proposed, and a RF power amplifier is designed using the technique. The transfer function of distributed matching circuits is derived by Chebyshev approximation, and network element values for a specified topology are given as a function of minimum insertion losses and ripples. As an example, after a power transistor is modeled by load-pull data, the synthesis for distributed matching networks is applied to a power amplifier design, which has the electrical performance of 17dB gain and less IM3 than -43dBc at the 20W output power between 800 to 900MHz frequency range. Experimental results from a fabricated amplifier are shown to approach the design performance in the operating frequency range. The design of impedance matching networks by the transfer function synthesis is a useful method for the design of RF power amplifiers.

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The Study on the implementation and design of the RF transceiver for fast frequency hopping (고속주파수 도약용 RF송수신기 설계 및 구현에 대한 연구)

  • Kim, Ki-Jung;Kim, Jong-Sung;Bae, Moon-Kwan
    • The Journal of the Korea institute of electronic communication sciences
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    • v.11 no.6
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    • pp.591-596
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    • 2016
  • This paper presents a study on the subject for the design and implementation of high-speed frequency hopping RF transceiver used for tactical communications systems. Jump the transmission / reception frequency of the L-band to hop tens per second is possible by maximizing the immunity to interference, and is applicable to communication systems having a charging rotation function. To high-speed frequency hopping it is necessary to apply the necessary fast frequency hopping scheme DDS Driven PLL added. In this paper, the RF transceiver design and simulation analysis capabilities with fast frequency tactical communication systems, were implemented after the main test for functionality and performance. Was demonstrated hop high-speed jump tens per second through a test, the main transmission output, were measured RF key performance, such as received noise figure, by using the VSG and VSA generates a ${\pi}/4$ DQPSK modulated signal constellation and by EVM measurement that there is no problem in applying the communications system described above was pre-validated.

Hybrid Precoder Design for Massive MIMO Systems with OSA structure (부분 중첩 안테나 배열 구조를 갖는 대용량 MIMO 시스템을 위한 하이브리드 프리코더 설계)

  • Seo, Bangwon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.2
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    • pp.274-279
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    • 2021
  • Since conventional massive antenna systems require too many RF chains, they have disadvantages of high implementation cost and complexity. To overcome this problem, hybrid precoding schemes have been proposed. But, they are still of high implementation cost and complexity because RF chains are connected to all antenna elements. In this paper, we consider massive MIMO systems with overlapped sub-array (OSA) structure and then, propose a hybrid precoding scheme. In the overlapped subarray structure, RF analog precoding matrix has a sparse structure where many elements of RF analog precoding matrix are zeros. Using this sparse property, we propose a GTP-based precoder design method for RF and baseband digital precoding. Through simulation, we show that the proposed scheme has more than 85% of the spectral efficiency of the fully-connected structure while having 20~30% of complexity of it.

RF Front-End Module Design of UWB Radars for Vehicle (차량용 UWB 레이더의 RF front-end 모듈 설계)

  • Park, Chi-Ho;Kim, Tae-Gyu
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.11
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    • pp.61-68
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    • 2008
  • In this paper, we propose a RF front-end developments for vehicle UWB radar systems. UWB systems have a very narrow pulse width that is below 1ns. Therefore, UWB is designed to have broadband quality of low power several GHz and must coexist with the radio communication system. UWB's advantages include high channel capacity and data rate, because precise resolution for multi-path can easily position estimate and Rake receiver. Also, UWB has low interference because it displays broadband quality of low power. Positioning is made possible by short range accuracy, which can reduce the expense of system design. An RF front-end module is designed using the DCR(Direct ConveRsion) method and is composed in RF for vehicles at a low-cost.

Study on the Broadband RF Front-End Architecture (광대역 RF 전단부 구조에 관한 연구)

  • Go, Min-Ho;Pyo, Seung-Chul;Park, Hyo-Dal
    • The Journal of the Korea institute of electronic communication sciences
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    • v.4 no.3
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    • pp.183-189
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    • 2009
  • In this paper, we propose RF front-end architecture using hybrid conversion method to receive broadband signal. The validity is verified by design, fabrication and experiment. The proposed RF front-end architecture due to up-conversion block improves the deficiency of performance deterioration to be generated through harmonic signal and image signal conversion in the conventional RF front-end, and improves the deficiency of the complexity that is from to adopt a multiple local oscillators for the generation of wideband LO signal in the conventional RF front-end by applying the principle that tuning bandwidth is multiplied at sub-harmonic mixer. Manufactured circuits satisfy the deduced design specification and target standard with gain above 80 dB, noise figure below 6.0 dB and IIP3 performance above -5.0 dBm for the condition of the minimum gain in RF front-end.

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A Survey on RF Energy Harvesting System with High Efficiency RF-DC Converters

  • Khan, Danial;Basim, Muhammad;Ali, Imran;Pu, YoungGun;Hwang, Keum Cheol;Yang, Youngoo;Kim, Dong In;Lee, Kang-Yoon
    • Journal of Semiconductor Engineering
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    • v.1 no.1
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    • pp.13-30
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    • 2020
  • Radio frequency (RF) energy harvesting technology have become a reliable and promising alternative to extend the lifetime of power-constrained wireless networks by eliminating the need for batteries. This emerging technology enables the low-power wireless devices to be self-sustaining and eco-friendly by scavenging RF energy from ambient environment or dedicated energy sources. These attributes make RF energy harvesting technology feasible and attractive to an extended range of applications. However, despite being the most reliable energy harvesting technology, there are several challenges (especially power conversion efficiency, output DC voltage and sensitivity) poised for the implementation of RF energy harvesting systems. In this article, a detailed literature on RF energy harvesting technology has been surveyed to provide guidance for RF energy harvesters design. Since signal strength of the received RF power is limited and weak, high efficiency state-of-the-art RF energy harvesters are required to design for providing sufficient DC supply voltage to wireless networks. Therefore, various designs and their trade-offs with comprehensive analysis for RF energy harvesters have been discussed. This paper can serve as a good reference for the researchers to catch new research topics in the field of RF energy harvesting.