A size reduced reflection-mode phase shifter

Kae-Oh Sun; Chih-Chuan Yen; Daniel van der Weide

doi:10.1002/mop.21198

An improved design for an Scanning Tunnelling Microscope (STM) for use in a Transmission Electron Microscope (TEM)

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100086222 ◽

1991 ◽

Vol 49 ◽

pp. 384-385

Author(s):

W.K. Lo ◽

J.C.H. Spence

Keyword(s):

Electron Microscope ◽

Transmission Electron Microscope ◽

Mechanical Stability ◽

Scanning Tunnelling Microscope ◽

Reflection Mode ◽

Specimen Holder ◽

Transmission Electron ◽

Scanning Tunnelling ◽

Improved Design

An improved design for a combination Scanning Tunnelling Microscope/TEM specimen holder is presented. It is based on earlier versions which have been used to test the usefulness of such a device. As with the earlier versions, this holder is meant to replace the standard double-tilt specimen holder of an unmodified Philips 400T TEM. It allows the sample to be imaged simultaneously by both the STM and the TEM when the TEM is operated in the reflection mode (see figure 1).The resolution of a STM is determined by its tip radii as well as its stability. This places strict limitations on the mechanical stability of the tip with respect to the sample. In this STM the piezoelectric tube scanner is rigidly mounted inside the endcap of the STM holder. The tip coarse approach to the sample (z-direction) is provided by an Inchworm which is located outside the TEM vacuum.

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An L-Band 4-Bit RL/RC-Switched Active Phase Shifter Using Differential Switches

IEICE Transactions on Electronics ◽

10.1587/transele.e92.c.1170 ◽

2009 ◽

Vol E92-C (9) ◽

pp. 1170-1175 ◽

Cited By ~ 1

Author(s):

Kenji NAKAMURA ◽

Yasushi ITOH

Keyword(s):

Phase Shifter ◽

Active Phase ◽

L Band ◽

Active Phase Shifter

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An Improved Design for Ka-Band Phase Shifter Using Distributed MEMS Transmission Line Structure

PIERS Online ◽

10.2529/piers110821262500 ◽

2005 ◽

Vol 1 (5) ◽

pp. 594-597 ◽

Cited By ~ 2

Author(s):

Boshi Jin ◽

Haoyuan She ◽

Yuemei Qin ◽

Jiahui Fu ◽

Qun Wu ◽

...

Keyword(s):

Transmission Line ◽

Phase Shifter ◽

Ka Band ◽

Line Structure ◽

Improved Design

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Analysis of Optimum Precoding schemes in Millimeter Wave System

Recent Advances in Computer Science and Communications ◽

10.2174/2666255813666200102124758 ◽

2020 ◽

Vol 13 ◽

Author(s):

Divya Singh ◽

Aasheesh Shukla

Keyword(s):

Power Consumption ◽

Millimeter Wave ◽

Spectral Efficiency ◽

Phase Shifter ◽

Phase Shifters ◽

Achievable Rate ◽

Wave System ◽

Digital To Analog Converter ◽

Hybrid Precoding ◽

Analog Converter

Background : Millimeter wave technology is the emerging technology in wireless communication due to increased demand for data traffic and its numerous advantages however it suffers from severe attenuation. To mitigate this attenuation, phased antenna arrays are used for unidirectional power distribution. An initial access is needed to make a connection between the base station and users in millimeter wave system. The high complexity and cost can be mitigated by the use of hybrid precoding schemes. Hybrid precoding techniques are developed to reduce the complexity, power consumption and cost by using phase shifters in place of converters. The use of phase shifters also increases the spectral efficiency. Objective: Analysis of Optimum Precoding schemes in Millimeter Wave System. Method: In this paper, the suitability of existing hybrid precoding solutions are explored on the basis of the different algorithms and the architecture to increase the average achievable rate. Previous work done in hybrid precoding is also compared on the basis of the resolution of the phase shifter and digital to analog converter. Results: A comparison of the previous work is done on the basis of different parameters like the resolution of phase shifters, digital to analog converter, amount of power consumption and spectral efficiency. Table 2 shows the average achievable rate of different algorithms at SNR= 0 dB and 5 dB. Table 3 also compares the performance achieved by the hybrid precoder in the fully connected structure with two existing approaches, dynamic subarray structure with and without switch and sub connected or partially connected structure. Table 4 gives the comparative analysis of hybrid precoding with the different resolutions of the phase shifter and DAC. Conclusion: In this paper, some available literature is reviewed and summarized about hybrid precoding in millimeter wave communication. Current solutions of hybrid precoding are also reviewed and compared in terms of their efficiency, power consumption, and effectiveness. The limitations of the existing hybrid precoding algorithms are the selection of group and resolution of phase shifters. The mm wave massive MIMO is only feasible due to hybrid precoding.

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РАЗРАБОТКА СВЧ МОНОЛИТНЫХ ИНТЕГРАЛЬНЫХ СХЕМ МИЛЛИМЕТРОВОГО ДИАПАЗОНА НА ОСНОВЕ GAAS ДЛЯ ПРИМЕНЕНИЯ В СОВРЕМЕННЫХ ИНФОРМАЦИОННОКОММУНИКАЦИОННЫХ СИСТЕМАХ НОВОГО ПОКОЛЕНИЯ (5G)

Nanoindustry Russia ◽

10.22184/1993-8578.2020.13.3s.321.324 ◽

2020 ◽

Vol 96 (3s) ◽

pp. 321-324

Author(s):

Е.В. Ерофеев ◽

Д.А. Шишкин ◽

В.В. Курикалов ◽

А.В. Когай ◽

И.В. Федин

Keyword(s):

Output Power ◽

Power Amplifier ◽

Integrated Circuit ◽

Phase Shifter ◽

Phase Error ◽

Microwave Integrated Circuit ◽

Gain Compression ◽

Monolithic Microwave Integrated Circuit ◽

And Performance ◽

Power Capability

В данной работе представлены результаты разработки СВЧ монолитной интегральной схемы шестиразрядного фазовращателя и усилителя мощности диапазона частот 26-30 ГГц. СКО ошибки по фазе и амплитуде фазовращателя составили 1,2 град. и 0,13 дБ соответственно. Максимальная выходная мощность и КПД по добавленной мощности усилителя в точке сжатия Ку на 1 дБ составили 30 дБм и 20 % соответственно. This paper describes the design, layout, and performance of 6-bit phase shifter and power amplifier monolithic microwave integrated circuit (MMIC), 26-30 GHz band. Phase shifter MMIC has RMS phase error of 1.2 deg. And RMD amplitude error is 0.13 dB. MMIC power amplifier has output power capability of 30 dBm at 1 dB gain compression (P-1dB) and PAE of 20 %.

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