scholarly journals DESIGN ANALYSIS OF A LOW-COST PARABOLIC ANTENNA FOR DEVELOPING NATION

2020 ◽  
Vol 26 (1) ◽  
Author(s):  
ONAIFO FRANK ◽  
OKANDEJI ALEXANDER AKPOFURE ◽  
IDOWU FISAYO ◽  
OLASUNKANMI OMOWUMMI GRACE ◽  
OLALUWOYE OLAWALE ◽  
...  
Keyword(s):  
High Frequency ◽  
Low Cost ◽  
Low Noise ◽  
Center Frequency ◽  
Radio Waves ◽  
Signal Loss ◽  
Very High Frequency ◽  
Parabolic Antenna ◽  
Microwave Signals ◽  
To Receive

<p>This paper is aimed at designing a locally fabricated fiberglass parabolic antenna as a replacement for a metallic fabricated parabolic antenna. They are coated with a thin film of aluminum dust to enhance reflectivity since electromagnetic radiations do not travel deep in a conductor. This reduces the thick mass of metal usually used for constructing metallic parabolic antenna leading to a reduced cost of production. It incorporates a Low Noise Block (LNB) Converter comprising of amplifiers and frequency down converter. Metallic parabolic antenna contributes more to signal loss by reflecting radio waves. The Parabolic antenna is designed to receive microwave signals in the K-band with the down converter converting it to very high frequency (VHF) and ultra-high frequency (UHF) employing the super-heterodyning principle. The study shows the design and installation of a low-cost parabolic antenna in the rural community in Nigeria. The designed parabolic antenna is used to receive a signal with the center frequency of 11.3GHz and signal strength of 60%. The economic viability is that fiber-glass Parabolic antenna can replace the metallic fabricated ones.</p>

scholarly journals DESIGN ANALYSIS OF A LOW-COST PARABOLIC ANTENNA FOR DEVELOPING NATION

2020 ◽  
Vol 26 (1) ◽  
Author(s):  
FRANK ONAIFO ◽  
ALEXANDER AKPOFURE OKANDEJI ◽  
FISAYO IDOWU ◽  
OMOWUMMI GRACE OLASUNKANMI ◽  
OLAWALE OLALUWOYE ◽  
...  
Keyword(s):  
High Frequency ◽  
Low Cost ◽  
Low Noise ◽  
Center Frequency ◽  
Radio Waves ◽  
Signal Loss ◽  
Very High Frequency ◽  
Parabolic Antenna ◽  
Microwave Signals ◽  
To Receive

This paper is aimed at designing a locally fabricated fiberglass parabolic antenna as a replacement for a metallic fabricated parabolic antenna. They are coated with a thin film of aluminum dust to enhance reflectivity since electromagnetic radiations do not travel deep in a conductor. This reduces the thick mass of metal usually used for constructing metallic parabolic antenna leading to a reduced cost of production. It incorporates a Low Noise Block (LNB) Converter comprising of amplifiers and frequency down converter. Metallic parabolic antenna contributes more to signal loss by reflecting radio waves. The Parabolic antenna is designed to receive microwave signals in the K-band with the down converter converting it to very high frequency (VHF) and ultra-high frequency (UHF) employing the super-heterodyning principle. The study shows the design and installation of a low-cost parabolic antenna in the rural community in Nigeria. The designed parabolic antenna is used to receive a signal with the center frequency of 11.3GHz and signal strength of 60%. The economic viability is that fiber-glass Parabolic antenna can replace the metallic fabricated ones.

scholarly journals A Strategic Review on Growth of InP on Silicon Substrate for Applications in High Frequency RF Devices

2012 ◽  
pp. 51-56
Author(s):  
Umesh.P. Gomes ◽  
Mr. Kuldeep ◽  
S. Rathi ◽  
Dhrubes Biswas
Keyword(s):  
High Frequency ◽  
Lattice Mismatch ◽  
Low Cost ◽  
High Electron Mobility Transistors ◽  
Low Noise ◽  
Superior Performance ◽  
High Electron ◽  
Electron Mobility Transistors ◽  
Strategic Review ◽  
Rf Devices

A review is presented on the advances in InAlAs/InGaAs High Electron Mobility transistors (HEMT) on silicon substrates for high frequency and low noise applications. Although InAlAs/InGaAs HEMTs on InP and GaAs substrates have been much appreciated due to their superior performance, their widespread applications have been hindered due to higher cost of the substrates. Silicon has been used as an alternative substrate considering the benefits of low cost, technological maturity and integration of III-V and silicon technology inspite of the constraints like lattice mismatch and large difference in thermal expansion coefficient.

Propagation of Very-High-Frequency Radio Waves

Nature ◽  
1951 ◽  
Vol 168 (4281) ◽  
pp. 870-871 ◽  
Author(s):  
E. HEATON JONES
Keyword(s):  
High Frequency ◽  
Radio Waves ◽  
Very High Frequency ◽  
Very High

scholarly journals Design of an Impulse Radiating Antenna Using a Curved TEM-Wire Fed Parabola

2012 ◽  
Vol 2012 ◽  
pp. 1-9
Author(s):  
Donghyun Lee ◽  
Haengseon Lee ◽  
Sunmook Hwang ◽  
Jaewoon Ahn
Keyword(s):  
High Frequency ◽  
Focal Point ◽  
Low Cost ◽  
Design Procedure ◽  
Wide Bandwidth ◽  
Parametric Curves ◽  
Parabolic Reflector ◽  
Parabolic Antenna ◽  
Tem Horn ◽  
Impulse Radiating Antenna

A design procedure for a TEM-wire fed parabolic antenna is given for impulse radiation, which is suitable for low cost fabrication. A simple wire-type TEM horn and a parabolic reflector are used to achieve ultra-wide bandwidth and high directivity at the same time. Equations for parametric curves of a TEM-wire horn are presented and are used to investigate the relation among their shapes, bandwidth, and directivity. It is also found that wire separation near the focal point limits the high frequency directivity.

40-MHz Micromachined PMN-PT Composite Ultrasound Array for Medical Imaging

2015 ◽  
Author(s):  
Sibo Li ◽  
Wenbin Huang ◽  
Wei-Yi Chang ◽  
Xiaoning Jiang
Keyword(s):  
Medical Imaging ◽  
High Frequency ◽  
Animal Studies ◽  
Low Cost ◽  
Steel Wire ◽  
Pulse Length ◽  
Small Animal ◽  
Center Frequency ◽  
Array Transducer ◽  
Pulse Echo

Ultrasonography is well known as a relatively low cost and non-invasive modality for real-time imaging. In recent years, various high frequency array transducers have been developed and used for ophthalmology, dermatology, and small animal studies. This paper reports the development of a 48-element 40-MHz ultrasonic array using micromachined lead magnesium niobate-lead titanate (PMN-PT) single crystal 1–3 composite material. Array elements with a pitch of 100-micron were interconnected via a customized flexible circuit. Pulse-echo test showed an average center frequency of 40 MHz and a −6 dB fractional bandwidth of 52%. The −20 dB pulse length was evaluated as 120 ns. The electrical and acoustical separation showed the crosstalk less than - 24 dB. An image of a steel wire target phantom was acquired by stacking multiple A-lines. The results demonstrate resolutions exceeding 70 μm axially and 800 μm laterally. Those results imply the great potential of the developed array transducer for the high frequency medical imaging.

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