MICROWAVE POWER TRANSMISSION

• Transmitter
• Receiver
• Sensor Circuitry
• Rectification

MICROWAVE POWER TRANSMISSION

MILLIMETER WAVE SCANNER

Wavelength falls in a range (1-10 millimeter) which is large compared to natural and synthetic fibers, they tend to pass through clothing materials.

Waves are produced with a series of small, disc-like transmitters stacked on one another called RADOME.

Automated Target Recognition ( ATR) can detect threats and highlight them for easy identification by using the software in the scanner system which interprets the data and presents an image.

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Solar Power Satellite

Two-Cavity Klystron

The microwave transmission system has three aspects:

1. The conversion of direct power from the photovoltaic cells, to microwave power on the satellites on geosynchronous orbit above the Earth.

2. The formation and control of microwave beam aimed precisely at fixed locations on the Earth’s surface.

3. The collection of the microwave energy and its conversion into electrical energy at the earth’s surface.

The key components are the Transmitter, Beam control and the receiving antenna called Rectenna.

Hyperthermia

• Effective in heating cancerous tumors, because tumors have high-water content.

• Elevating the temperature (about 108 °F for an hour) of tumor cells resulting in cell membrane damage, leading to the destruction of the cancer cells.

• Treatment requires directing a 'carefully' controlled dose of heat.

• When antenna is turned “on,” body tissues with high-water content are irradiated with significant amounts of microwave energy and are heated (transfer of microwave energy into heat).

MOBILE PHONE CHARGING

PROPERTIES

• Reflected by metal surfaces.

• Easily absorbed by water molecules

• Pass through glass, plastics and atmosphere.

• Transmission is affected by reflection, refraction, diffraction and interference.

• Pass through ionosphere without reflection.

• Heat materials through vibration of atoms and molecules.

MAGNETRON TRANSMITTER

INTRODUCTION

Magnetron is the combination of a simple diode vacuum tube with built in cavity resonators and an extremely powerful permanent magnet.

• also known as

Radio-waves

Radar and Navigation

Magnet:

Consists of circular anode with an even number of resonant cavities.

(diameter of 1 cavity = x wavelength at the operating frequency).

1

_

2

Anode:

Made of copper,

Connected to a high-voltage positive direct current.

1 mm to 1 meter

• Wave length:

• Frequency :

3000 MHZ to 300 GH

• Lowest-energy

• Lowest-frequency

• Longest-wavelength

SLOTTED WAVEGUIDE ANTENNA

A Hollow metallic tube of uniform cross section for transmitting electromagnetic waves by successive reflections from the inner walls of the tube is called waveguide.

2320 to 2300 MHz

• Omni-directional

• Light in weight,weather proof

• Tuning screws used to adjust center frequency from

• Low loss transmission line

• Exceptional directionality in the elevation plane gives it quite high power gain

• Transmits its energy using horizontal polarization

Transmitted waves come into contact with an object and reflect or scatter in many directions (especially by materials of considerable electrical conductivity)

The antenna is usually curved to focus waves into a precise, narrow beam and also rotate for large area detection. The radio waves travel outward from the antenna at the speed of light and keep going until they hit something.

Reflected radar signals captured by the receiving antenna are strengthened by electronic amplifiers, sophisticated methods of signal processing are also used in order to recover useful radar signals.

Mobile Phone Charging

Hyperthermia

Millimeter Wave Scanner

APPLICATIONS

Radar and Navigation

Solar Power Satellite