ANTENNA THEORY DAN DESIGN

ASSIGNMENT 1

LECTURER NAME:

DR RIJAL

GROUP MEMBER:

FURSAN BIN AZMAN

AZRUL FAZLI BIN ZAINUDDIN

OBJECTIVES

Provide an understanding of the basic principles of Antennas and radiation.

Provide an overview of the fundamental characteristics and parameters of antennas

MONOPOLE ANTENNA

DESIGN USING CST SOFTWARE

RESULT FROM SIMULATION

• S11 PARAMETER

RETURN LOSS= -14.183 dB

CONTINUED…

• Gain

GAIN=3.541dB

CONTINUED…

• E-FIELD

CONTINUED…

• H-FIELD

RESULT FROM THEORITICAL

• S11 PARAMETER

RETURN LOSS = -14.050 dB

CONTINUED…

• H-FIELD

CONTINUED…

• E-FIELD

COMPARISON

SIMULATION THEORITICAL

LENGTH ANTENNA 31.7mm 31.7mm

FREQUENCY 2.347GHz 2.4GHz

WAVELENGTH 0.1278 meter 0.125 meter

RETURN LOSS -14.183 dB -14.050 dB

DISCUSSION

• Practical length and radius of antenna not accurate with the simulation design.

• Human error such as measurement process.

• Contribute the different environmental effect and equipment error.

YAGI UDA ANTENNA

• By using 400 MHz frequency and we using material copper for the antenna

• and using formula λ = 𝑐/𝑓

• We get λ = 0.75 𝑚 then λ

2= 0.375 𝑚

• Dipole length = λ

2= 0.375 m

• Reflector length = λ

2+ 0.05(

λ

2)

• Reflector = 0.394 m

• Meanwhile director length = λ

2− 0.05(

λ

2) = 0.356 m

• The distance for dipole – reflector is 0.2 λ = 0.15 m• The distance for dipole – director is 0.125 λ = 0.09375• Formula from www.youtube.com/watch?v=7Dy8j5XnF6o

Yagi Udadesign

0.15m0.093m

0.394m

0.375m

0.356m

Simulation – s parameter

Far field f=300MHz Gain

H- fieldE- field

Far field f=400MHz Gain

H- fieldE- field

Far field f=500MHz Gain

H- fieldE- field

• By using 400 MHz frequency and we using material copper for the antenna

• and using formula λ = 𝑐/𝑓

• We get λ = 0.75 𝑚 then λ

2= 0.375 𝑚

• Dipole length =0.45 λ = 0.3375 m

• Reflector length = λ

2= 0.375 m

• Meanwhile director length = 0.405 λ = 0.304 m• The distance for dipole – reflector is 0.25 λ = 0.1875 m• The distance for dipole – director is 0.34 λ = 0.255 m• Formula is from

http://www.urel.feec.vutbr.cz/~raida/multimedia/en/4-3-A.pdf

Yagi Udadesign

0.1875 m

0.255 m

0.375 m

0.3375 m

0.304 m

Simulation – s parameter

Far field f=300MHz Gain

H- fieldE- field

Far field f=400Mz Gain

H- fieldE- field

Far field f=500MHz Gain

H- fieldE- field

How to optimize your yagi uda design

1. Increase your director

Far field f=400MHz Gain

How to optimize your yagi uda design

1. Increase your director

Far field f=400MHz Gain

No of direct

or

Length(mm)

Boom Position

(mm)

Gain(dB)

1 152 270 7.62

2 152 390 8.36

3 152 510 9.05

2. Element spacing

Type Yagi Uda A Yagi Uda B

Distance of reflector to dipole(mm)

187.5 150

Distance of director to

dipole(mm)

255 120

Gain(dB) 7.62 7.25

2. Antenna length

Type Yagi Uda A Yagi Uda B

Length of reflector (mm)

375 400

Length of director(mm)

304 340

Length of dipole(mm)

337.5 360

Gain(dB) 7.62 8.36

THANK YOU..