Development of a low-cost, low micro-vibration CMG for small agile satellite applications

2017 ◽  
Vol 131 ◽  
pp. 113-122 ◽  
Author(s):  
B.J. Kawak
Keyword(s):  
Low Cost ◽  
Agile Satellite ◽  
Satellite Applications ◽  
Micro Vibration

scholarly journals Circularly Polarized S Band Dual Frequency Square Patch Antenna Using Glass Microfiber Reinforced PTFE Composite

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
M. Samsuzzaman ◽  
M. T. Islam ◽  
Haslina Arshad ◽  
J. S. Mandeep ◽  
N. Misran
Keyword(s):  
Patch Antenna ◽  
Low Cost ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Physical Parameters ◽  
Dual Frequency ◽  
Circularly Polarized ◽  
Ptfe Composite ◽  
Lower Band ◽  
Satellite Applications

Circularly polarized (CP) dual frequency cross-shaped slotted patch antenna on 1.575 mm thick glass microfiber reinforced polytetrafluoroethylene (PTFE) composite material substrate is designed and fabricated for satellite applications. Asymmetric cross-shaped slots are embedded in the middle of the square patch for CP radiation and four hexagonal slots are etched on the four sides of the square patch for desired dual frequency. Different substrate materials have been analysed to achieve the desired operating band. The experimental results show that the impedance bandwidth is approximately 30 MHz (2.16 GHz to 2.19 GHz) for lower band and 40 MHz (3.29 GHz to 3.33 GHz) for higher band with an average peak gain of 6.59 dBiC and 5.52 dBiC, respectively. Several optimizations are performed to obtain the values of the antenna physical parameters. Moreover, the proposed antenna possesses compactness, light weight, simplicity, low cost, and circularly polarized. It is an attractive candidate for dual band satellite antennas where lower band can be used for uplink and upper band can be used for downlink.

A Low-Cost Ka-Band Circularly Polarized Passive Phased-Array Antenna for Mobile Satellite Applications

2019 ◽  
Vol 67 (1) ◽  
pp. 221-231 ◽  
Author(s):  
Hussam Al-Saedi ◽  
Suren Gigoyan ◽  
Wael M. Abdel-Wahab ◽  
Ardeshir Palizban ◽  
Aidin Taeb ◽  
...  
Keyword(s):  
Phased Array ◽  
Low Cost ◽  
Array Antenna ◽  
Phased Array Antenna ◽  
Circularly Polarized ◽  
Satellite Applications ◽  
Mobile Satellite

scholarly journals Low-cost steerable antenna for satellite applications

2019 ◽  
Vol 610 ◽  
pp. 012067
Author(s):  
M. Wady ◽  
W. Swelam ◽  
Mohamed H. Adel Azeem
Keyword(s):  
Low Cost ◽  
Satellite Applications ◽  
Steerable Antenna

scholarly journals DESIGN OF A LOW-COST 2-AXES FLUXGATE MAGNETOMETER FOR SMALL SATELLITE APPLICATIONS

2005 ◽  
Vol 22 (1) ◽  
pp. 35-46
Author(s):  
Su-Jeoung Kim ◽  
Byoung-Young Moon ◽  
Young-Keun Chang ◽  
Hwa-Suk Oh
Keyword(s):  
Low Cost ◽  
Fluxgate Magnetometer ◽  
Small Satellite ◽  
Satellite Applications

scholarly journals A Telemetry, Tracking, and Command Antennas System for Small-Satellite Applications

Electronics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 689 ◽  
Author(s):  
Paolo Squadrito ◽  
Patrizia Livreri ◽  
Loreto Di Donato ◽  
Concetto Squadrito ◽  
Gino Sorbello
Keyword(s):  
Low Cost ◽  
Axial Ratio ◽  
Field Pattern ◽  
Impedance Bandwidth ◽  
Wide Angle ◽  
Small Satellite ◽  
Space Applications ◽  
Left Hand ◽  
Low Profile ◽  
Satellite Applications

Circularly polarized (CP) antennas are used in space applications for telemetry tracking and command (TT&C). In this paper, we present an antenna for a TT&C system that can employ only four antennas to achieve a wide quasi-isotropic coverage. The proposed single-feed circular polarized annular patch antenna is low profile and compact. It exhibits a wide impedance bandwidth of 19.7%, wide-angle circular polarization with an on-axis maximum gain higher than 6 dBi and an axial ratio below 4 dB in the frequency band 2.0–2.3 GHz. The developed low-cost antenna can be used for small-satellite data downlink where only two right hand circular polarized (RHCP) antennas and two left hand circular polarized (LHCP) antennas would be required since each antenna has an adequate CP gain on a wide angle. A prototype antenna has been fabricated and measured. The experimental validation shows a good agreement of the measured impedance bandwidth, axial ratio, and far-field pattern with the ones predicted by numerical full-wave study.

scholarly journals Design of Ku Band Microstrip Patch Antenna Array for Satellite Applications

2019 ◽  
Vol 8 (3) ◽  
pp. 7903-7908
Keyword(s):  
Low Cost ◽  
High Gain ◽  
Patch Antennas ◽  
Long Distance ◽  
Array Configuration ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch ◽  
Low Profile ◽  
Satellite Applications ◽  
Distance Communication

Conventional Microstrip patches are in small in size, but their gain is quite low for most applications. Long-distance communication requires high gain antennas. For conventional applications that require high gain mostly depends on parabolic antennas and arrays. Manufacturing parabolic antennas became complex at high frequencies because of its bent geometry. Microstrip Patch Antennas are low profile, low cost, they come with ease of fabrication and results in high beam scan width and high gain when they were used as an array configuration. In this paper, square and circular shaped Microstrip patch antennas are excited with inset feed are analyzed to determine which shape of antenna works well at the Ku (12-18GHz) Range of Frequency. Return loss, VSWR, Gain, and Directivity parameters are considered to analyze the above configurations. CST studio suite tool was used to simulate the configurations.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

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