rf components and systemsrf components and systems prof
TRANSCRIPT
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RF Components and SystemsRF Components and Systems
Prof Girish KumarProf. Girish KumarElectrical Engineering Department
IIT BombayIIT Bombay
gkumar@ee iitb ac [email protected] (022) 2576 7436
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RF Communication SystemsyModulating
signalTransmitter
Carrier
Modulator AmplifierImpedance matching network
signal
Receiver
RFAmplifier
MixerIF filter
and Amplifier
Demodulator
Display device/ speakerp
LO
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RF Components and Systemsy
Amplifier Power Combiner /Divider
Antenna
A
Radar
R di ti Shi ldAttenuator
Coupler
Radiation Shield
Repeater
Filter Signal Enhancer
S li / TMobile Phone Jammer Splitter / Tapper
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Amplifier
Low Noise Amplifierp
Medium Power Amplifier
High Power Amplifier
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Antenna
MonopoleMonopoleDipoleLoopLoopYagi-UdaLog-PeriodicHelicalHornMicrostrip (Patch)Reflector
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Narrow Band Antenna
Frequency Bands: 824-894, 890-960, 1710 1880 1880 19301710-1880, 1880-1930,2400-2500 (MHz)
Gain (dB): 2, 7, 8, 9, 12, 15, 18
VSWR: 2 (Max)VSWR: 2 (Max)
Polarization: Vertical,Dual Polarization
Connector: SMA, N-TypeConnector: SMA, N Type
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GSM Antenna 8dB Gain
Smith Chart VSWR Plot Radiation Pattern
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Broad Band Antenna
Frequency Bands: 800-8000 (MHz)q y ( )
Gain (dB): 2( )
VSWR: 2 (Max)
Polarization: Vertical
Connector: SMA, N-Type
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Attenuator
Frequency Bands: Narrow BandBroadband DC-2500 (MHz)
I/P VSWR: 1.2 (Max)O/P VSWR 1 2 (M )O/P VSWR: 1.2 (Max)Connector: SMA, N-TypeFi d Att tFixed Attenuator:
Attenuation (dB): 3, 6, 10, 15, 20, 30Power Handling (W): 0.5 1 5 20 50 100
Variable Attenuator:Attenuation (dB): 3 to 30 Power Handling (W): 0.5 g ( )
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Coupler
Frequency Bands (MHz): 824-894, 890-960, 1710-1880, q y ( ) , , ,1880-1930, 2400-2500 Insertion Loss (dB Max): 0.3I/P VSWR 1 2 (M )I/P VSWR: 1.2 (Max)O/P VSWR: 1.2 (Max)Power Handling (Watt): 5 20 100Power Handling (Watt): 5, 20, 100Connector: SMA, N-TypeCoupling:
7dB, 10dB, 15 dB - Directivity (dB min): 20
25dB - Directivity (dB min): 1530dB, 35dB - Directivity (dB min): 10
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Power Divider/Combiner
2 – Way
3 – Way
4 – Wayy
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Mobile Phone Jammer / SilencerMobile Phone Jammer generates larger noise than the signal strength in that location.than the signal strength in that location.
Power – Low, medium and high* Low Power – small range* High Power – large range
APPLICATIONSColleges, Meeting/Seminar Rooms, Prison, Religious Places, VIP movement, Court, Theater, etc.
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Signal Enhancer / RepeatergSignal Enhancer amplifies the weak signal present in that areain that area
Single or Multi – BandGain and Power – Low, medium and highGain and Power Low, medium and highOmni or Directional
APPLICATIONSRoom, Hall, Open Space, Vehicle, Lift, Garage, P ki L tParking Lot
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GPS and GSM ModulesGlobal Positioning System (GPS) receiver modules - give the location of the carrier and time. Track GPS satellites using
1circularly polarized antenna at 1575 MHz.
GPS Data can be stored in a memory and retrieved later.
Data can be transmitted using GSM module at a predefined interval or on demand.
D t b t itt d i t i t ifi dData can be transmitted using transceivers at specified frequency.
Hand Held, Locket or Vehicle mounted.,
APPLICATIONSVehicle Tracking, People Tracking, Location Identification
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RF TransceiverRF Transmitter, Receiver and Transceiver
Data can be transmitted using specified Frequency - WPC- 433 MHz, 866 MHz, 2.45 GHz, 5.8 GHz- Data Rate, Bandwidth ,
Data modulation / demodulation, Secure comm., data compression, error correctioncompression, error correction
APPLICATIONSSecurity Alarm Distress MessagingSecurity, Alarm, Distress Messaging,
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RFID
RFID – Radio Frequency Identification
Active and Passive Tags, Reader
St d d F WPCStandard Frequency - WPC- 125 KHz, 13.56 MHz, 866 MHz, 2.45 GHz, 5.8 GHz
APPLICATIONSRetail, Library Management, Vehicle License Plate, e-passport Product Tracking Electronic Toll Collectionpassport, Product Tracking, Electronic Toll Collection,
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Ground Penetrating Radar (GPR)gGPR is used for forensics, landmine detection buriedlandmine detection, buried objects
Reflected amplitude & phaseReflected amplitude & phase data are captured for reconstruction of images for underground objects.g j
Depth of penetration depends on transmitted power and frequency.
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24 GHz Radar Systemy
24 GHz Radar System24 GHz Radar System-To measure speed of the vehicle(1 Km to 20 Km)T l th f th hi l-To measure length of the vehicle(0.1 m to 10’s of meters)
Extremely Sensitive – can detect even hand movement
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High Power Microwaveg
Microwave Heating ApplicationsMicrowave Heating Applications- Cooking, Drying, Food-processing- Hyperthermia
Communication Range is increased
Microwave Bomb
Microwave WeaponMicrowave Weapon
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CONCLUSIONS
RF Technology is rapidly changing.
Requirement for innovative thinking to meet the demands and challengesmeet the demands and challenges.
Design is the key thing.
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Any Questions ??