A high-gain and high-efficiency X-band triaxial klystron amplifier with two-stage cascaded bunching cavities

2017 ◽  
Vol 24 (12) ◽  
pp. 123118 ◽  
Author(s):  
Wei Zhang ◽  
Jinchuan Ju ◽  
Jun Zhang ◽  
Huihuang Zhong
Keyword(s):  
High Efficiency ◽  
High Gain ◽  
Two Stage ◽  
X Band

scholarly journals Design of a High Gain Compact Circular Microstrip Patch Antenna for X-Band

2018 ◽  
Vol 7 (2.6) ◽  
pp. 168
Author(s):  
Madhukant Patel ◽  
Veerendra Singh Jadaun ◽  
Kanhiya Lal ◽  
Piyush Kuchhal
Keyword(s):  
Patch Antenna ◽  
Microstrip Antenna ◽  
High Efficiency ◽  
High Gain ◽  
Microstrip Patch Antenna ◽  
Radar Sensors ◽  
Microstrip Patch ◽  
X Band ◽  
Circular Patch Antenna ◽  
Power Radiation

This paper presents design a High Gain Small Size Microstrip Patch Antenna for X-Band applications such as Moving target RADAR sensor, Motion detector, Microwave camera, Ground Penetration RADAR sensors, wall penetration scanners and many medical applications. Now we have to selected circular geometry of micro strip patch antenna because circular geometry overcomes edge effect of antenna. The proposed antenna is designed to operate for X-band at the centre frequency of 10 GHz. The proposed Circular patch antenna is compact and easy to body mount with a high efficiency. The compactness makes it a better choice as compare with other antenna in the X-band. The proposed antenna shows a very sharp return loss of -46 dB at 10 GHz having narrow pattern with a good gain of 4.7 dBi. This enables its use in high directional applications. The paper represents the designing steps, and the simulation result obtained. The software used here for this circular shaped microstrip antenna is IE3D. Various parameters such as gain, power, radiation pattern, and S11 of the antenna are mentioned.

X-band two-stage high-efficiency switched-mode power amplifiers

2005 ◽  
Vol 53 (9) ◽  
pp. 2899-2907 ◽  
Author(s):  
S. Pajic ◽  
Narisi Wang ◽  
P.M. Watson ◽  
T.K. Quach ◽  
Z. Popovic
Keyword(s):  
Power Amplifiers ◽  
High Efficiency ◽  
Two Stage ◽  
X Band

scholarly journals High-Efficiency High-Gain 2.4 GHz Class-B Power Amplifiers in 0.13 µm CMOS for Wireless Communications

2017 ◽  
Author(s):  
Tuan Anh Vu ◽  
Tuan Dinh Pham ◽  
Duong Gia Bach
Keyword(s):  
Wireless Communications ◽  
High Power ◽  
Power Amplifiers ◽  
High Efficiency ◽  
High Gain ◽  
Two Stage ◽  
Mixed Signal ◽  
Power Added Efficiency ◽  
Multi Stage ◽  
Class B

This paper presents high-efficiency high-gain 2.4 GHz power amplifiers (PAs) for wireless communications. Two class-B PAs are designed and verified in 0.13 µm CMOS mixed-signal/RF process provided by TSMC. The PAs employs cascode topologies with wideband multi-stage matchings. The single-stage cascode PA is designed for a high power added efficiency (PAE) of 35.4% while the gain is 20.4 dB over the -3 dB bandwidth between 2.4 GHz and 2.48 GHz. The two-stage cascode PA is targeted for a high gain of 37.7 dB while it exhibits a peak PAE of 24.1%. Supplied by 1.2 V supply voltages, the PAs consume DC powers of 4.5 mW and 9 mW, respectively.

scholarly journals High-Efficiency Polarizer Reflectarray Antennas for Data Transmission Links from a CubeSat

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1802
Author(s):  
Eduardo Martinez-de-Rioja ◽  
Daniel Martinez-de-Rioja ◽  
Rafael López-Sáez ◽  
Ignacio Linares ◽  
Jose A. Encinar
Keyword(s):  
Circular Polarization ◽  
Data Transmission ◽  
High Efficiency ◽  
High Gain ◽  
Dual Band ◽  
Left Handed ◽  
Linearly Polarized ◽  
Flat Profile ◽  
First Time ◽  
Collimated Beam

This paper presents two designs of high-efficiency polarizer reflectarray antennas able to generate a collimated beam in dual-circular polarization using a linearly polarized feed, with application to high-gain antennas for data transmission links from a Cubesat. First, an 18 cm × 18 cm polarizer reflectarray operating in the 17.2–22.7 GHz band has been designed, fabricated, and tested. The measurements of the prototype show an aperture efficiency of 52.7% for right-handed circular polarization (RHCP) and 57.3% for left-handed circular polarization (LHCP), both values higher than those previously reported in related works. Then, a dual-band polarizer reflectarray is presented for the first time, which operates in dual-CP in the frequency bands of 20 GHz and 30 GHz. The proposed antenna technology enables a reduction of the complexity and cost of the feed chain to operate in dual-CP, as a linear-to-circular polarizer is no longer required. This property, combined with the lightweight, flat profile and low fabrication cost of printed reflectarrays, makes the proposed antennas good candidates for Cubesat applications.

High-efficiency CuInSe2 solar cells prepared by the two-stage process

Solar Cells ◽  
1989 ◽  
Vol 27 (1-4) ◽  
pp. 299-306 ◽  
Author(s):  
Bulent M. Basol ◽  
Vijay K. Kapur ◽  
Richard C. Kullberg
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Two Stage ◽  
Stage Process
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