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A Compact Dual Frequency Microstrip Antenna Sona O Kundukulam and Aanandan Chandroth Karuvandy Cochin University of Science and Technology INDIA A device for * sending out signals Transmitting Mode * accepting signals Receiving Mode Cochin University of Science and Technology, INDIA

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slide1

A Compact Dual Frequency Microstrip Antenna

Sona O Kundukulam and Aanandan Chandroth Karuvandy

Cochin University of Science and Technology

INDIA

slide2

A device for

* sending out signals

Transmitting Mode

* accepting signals

Receiving Mode

Cochin University of Science and Technology, INDIA

slide3

Broadcasting Antenna

Cochin University of Science and Technology, INDIA

slide4

Microwave Link

Cochin University of Science and Technology, INDIA

slide5

Antenna Characteristics remain the same

in the Tx and Rx Mode

1. Radiation Pattern

 In which directions it can transmit energy or

 from which directions it can receive energy

Cochin University of Science and Technology, INDIA

slide6

2. Gain

how effectively the antenna can concentrate energy

in a desired direction

3. Polarisation

the orientation of electric field in the em wave

4. Bandwidth

Frequency band over which the characteristics

are within the specified range

Cochin University of Science and Technology, INDIA

slide7

antenna

Return loss(dB)

Dummy load

Frequency(GHz)

2

1

Dummy load is perfectly matched, but it is not radiating !

Cochin University of Science and Technology, INDIA

slide8

Patch

Substrate

Ground Plane

Side view

Top view

Microstrip Antenna

Antenna that can be integrated to the circuit

Cochin University of Science and Technology, INDIA

slide9

Attractive Features

 It is conformal

Reduces aerodynamic problems in moving vehicles

 Smaller in size

Suitable for compact systems

 Inexpensive in mass production

Cochin University of Science and Technology, INDIA

slide10

Geometry of the Patch determines the Antenna Characteristics

New Design

 More compact than currently available Microstrip Antennas

 Operates at two frequency bands

 Two bands are orthogonally polarised

 Antenna can be energised independently using two feeding ports

without any interference between the two bands

Cochin University of Science and Technology, INDIA

slide11

Port1

Port2

Crescent shaped Microstrip Antenna

Cochin University of Science and Technology, INDIA

slide12

HP 8510C Network Analyser

Cochin University of Science and Technology, INDIA

slide13

Anechoic Chamber

Cochin University of Science and Technology, INDIA

slide14

Position Controller

Network Analyser

PC

Cochin University of Science and Technology, INDIA

slide15

0

-10

Port 2

-20

return loss (dB)

Port 1

-30

-40

-50

1.0

1.2

1.4

1.6

1.8

2.0

frequency (GHz)

Cochin University of Science and Technology, INDIA

slide16

0

Isolation (dB)

-10

-20

-30

-40

1.0

1.2

1.4

1.6

1.8

2.0

Frequency (GHz)

Cochin University of Science and Technology, INDIA

slide17

Radiation Patterns

Cochin University of Science and Technology, INDIA

slide18

Thank you

Thank you

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Thank you

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Thank you

Thank you

Thank you

Thank you

Thank you

Thank you

Thank you

Cochin University of Science and Technology, INDIA