The document discusses different types of phase shifters, including ferrite and semiconductor phase shifters. Ferrite phase shifters work by changing the permeability of ferrite material with a magnetic field, thus changing the guided wavelength and phase delay. Semiconductor phase shifters include switched line, loaded line, and switched path designs using PIN diodes or FETs. Digital phase shifters provide precise phase shifts in discrete increments. Phase shifters have applications in communication systems, radar systems, and industrial instrumentation due to their ability to electronically control the phase of RF signals.
LEDs are of interest for fibre optics because of five inherent characteristics..
How it works?
Spectrum of an LED
Modulation of LED
LED Vs. Laser diode
disadvantages of LED
Salient Features:
The magnitude response is nearly constant(equal to 1) at lower frequencies
There are no ripples in passband and stop band
The maximum gain occurs at Ω=0 and it is H(Ω)=1
The magnitude response is monotonically decreasing
As the order of the filter ‘N’ increases, the response of the filter is more close to the ideal response
LEDs are of interest for fibre optics because of five inherent characteristics..
How it works?
Spectrum of an LED
Modulation of LED
LED Vs. Laser diode
disadvantages of LED
Salient Features:
The magnitude response is nearly constant(equal to 1) at lower frequencies
There are no ripples in passband and stop band
The maximum gain occurs at Ω=0 and it is H(Ω)=1
The magnitude response is monotonically decreasing
As the order of the filter ‘N’ increases, the response of the filter is more close to the ideal response
Join immixGroup’s Senior Market Intelligence Analyst, Stephanie Meloni, as she shares actionable insights on the DOD Combatant Commands (COCOMs) major IT initiatives and funded programs and offices.
http://www.immixgroup.com/COCOMs-briefing
World Wide Technology Tec37 Webinar - Deploy and Manage Windows 10 at Scale v1World Wide Technology
World Wide Technology (WWT) TEC37 webinar focused on deploying and managing Windows 10, including what tools will be needed to deploy OS patches and updates. Panelists include Wendell Layne, WWT’s end-user computing product manager, Steve Adams, partner technology strategist for Windows and devices from Microsoft; Dan Huber, a mobility solutions architect for WWT focused on digital experience; Kelly Ryan, a solutions architect for WWT focused on virtualization and Darrin Dennis, a solutions architect for WWT focused on all things Windows server infrastructure related.
Topics covered include:
- How to effectively manage physical and virtual desktops as well as mobile devices without the need for disparate systems
- New ways to deploy OS updates using Windows Insider Preview, Windows Current Branch and Current Branch for Business
- How to use patch management to lock down Windows 10
- VDI opportunities new to Windows 10
An overview of GTRI's system integrator practice, with a focus on Splunk. Presented at GTRI's Splunk Tech Day, December 8, 2015.
Visit http://www.gtri.com/ for more information.
People as sensors - mining social media for meaningful informationTom Raftery
The video of this talk is available at https://www.youtube.com/watch?v=4ZdknOPY_jQ
More and more we are all broadcasting information. Geolocation data, “this x sucks” data, weather data, etc.
More and more that data is being parsed and analysed in realtime, such that we have now become sensors.
How does this work, what does this mean, and what risks/benefits will it bring?
The attached narrated power point presentation attempts to explain the basic working principle , different types and characteristics, gain and noise performance . drawbacks and applications of semiconductor optical amplifiers. The material will be beneficial to KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
Join us for a LIVE WEBINAR on this topic! Wednesday, November 14, 2:00pm ET
http://bit.ly/XPgjO7
Wide bandwidth modulation is becoming more common in communications. The emergence of the 802.11ac wireless Ethernet standard has extended the modulation bandwidth to 160 MHz which requires very wide band measurement equipment to measure. This presentation illustrates the details of a measurement method that uses a real time digital down converter and post processing software that measures the performance of this signal.
60 GHz mixed signal active load pull for millimeter wave devices characteriza...Luca Galatro
Master thesis presentation held on 16-05-2012. In this work a prototipe for a mm-wave mixed signal active load pull working in the frequency range from 50 to 65 GHz is presented. Further work has been accomplished on the topic, and a final version of the measurement setup has been presented at 81st and 83rd ARFTG conferences.
Design and Implementation of Re-configurable AntennaIJARIIT
This paper introduces a design of advanced and efficient technique used for antenna reconfiguration. Conventional
antennas are designed for specific application as it operates at a particular frequency range. On the other hand reconfigurable
antenna provides performance enhancement and gives single antenna structure to operate at various frequency range. In
order to obtain this, we use the technique of frequency reconfiguration i.e. PIN diode switching through which it can switch
among different frequency band. Antenna design is simulated and analyzed using HFSS software.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
3. INTRODUCTION
•A Phase Shifter is two-port device whose basic function is
to provide a change in the phase of RF signal with
practically negligible attenuation.
6. FERRITE PHASE SHIFTERS
• THEORY
» Is the change in the effective permanent of ferrite with
the magnetic field
As the permeability increase the effectiveness of the
ferrite rod increases since guided wavelength is equal
to wavelength in space divided by effectiveness
(permeability), hence guide wavelength
decreases, which result in a change or RF insertion
phase.
7. Semiconductor Phase
Shifters
Planar/hybrid MIC Monolithic
Reciprocal Non reciprocal Reciprocal Non reciprocal
P-I-N GaAs FET GaAs FET GaAs FET GaAs FET
diode (Passive) (active switch) (passive) (active switch)
• Switched line • Switched path • Switched • Switched path
• Hybrid coupled line/loaded DGFET
• Loaded line line
• High-pass low- • Hybrid coupled
pass • High-pass low
• Switched -pass
network
8. DIGITAL PHASE SHIFTER
Specification of Digital Phase Shifter
Frequency 0.5 to 2.0 GHz
Phase Accuracy +/- 10
Amplitude Balance +/- 1.0 dB
V.S.W.R 1.7:1
Noise Figure 7 dB
0 dBm CW ~ +2- dBm
Input power
Max
Size 4.95 x 3.38 x 1.0 inch
Switching Speed 500 nSec
9. Basic terms connected to antenna array :
1.Insertion phase - It is the phase delay experienced by the RF signal between
its input and outputs ports.
2. Input VSWR - The input voltage standing wave ratio is defined as
VSWR = 1 + | S11 |
1 - | S11 |
3.Directivity - The ratio of the radiation intensity in a given direction from
the antenna to the radiation intensity averaged over all directions
D = 4 U / P rad
10. APPLICATIONS
• Used in a variety of communication and radar
systems
• microwave instrumentation and measurement
systems
• In industrial applications.
11. CONCLUSION
• Phased array radars are used for inertia less scanning and tracking. They
as well can be used for multi target tracking.
• Phased arrays can also be used for air traffic control at the airports.
• Other than defence applications, phase shifters are finding their place in
routine life.
• An American company is working on a project where phased arrays are
used for finding the blind stops on road while driving.
• With such high tech commercial application, driving on road will be safer.
• The phase shifter technology for phased arrays has no limitation either in
defence applications or in our daily life.