Patch Antenna Design Tutorial With CST Microwave - Electronics Engineering Tutorials

10/22/2014

Patch antenna design tutorial with CST microwave - Electronics Engineering Tutorials

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About & Contact Home » CST Studio Tutorial » Patch antenna design tutorial with CST microwave

Patch antenna design tutorial with CST microwave This is a tutorial series on microstrip patch antenna design with inset feed in CST microwave. The antenna will be designed to work in 2.4GHz ISM band used in WiFi devices. The overall design steps for designing the patch antenna in CST microwave studio involves1. Calculation of the dimension of the patch antenna, substrate, ground plane, effective dielectric constant, impedance etc. 2. Inputting the parameter obtained into the CST microwave studio, draw the substrate,, ground plane, patch antenna, gap between the patch and microstrip feed and microstrip feed. 3. Simulation and Optimization http://appliedelectronicsengineering.blogspot.in/2013/08/patch-antenna-design-tutorial-with-cst.html

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The patch antenna picture that will be designed is shown below-

Because it is a lengthy process, each step is described in different blog post. The first step which involves the calculation is described in this post. Readers can skip to2nd Part- Design of Microstrip Patch Antenna in CST Microwave Studio 3rd Part- Inset Fed Patch Antenna Simulation and Result Design Specification: Suppose we want to design the patch antenna that resonates at 2.45GHz on a RT/Duroid 5870 substrate. The RT/Duroid substrate has a dielectric constant of 2.33 and a thickness (or height) of 0.787mm. The first step is determine the length and width of the patch antenna. These can be determined using the following equationsFor Width,

W =

− − − −

c

√

2f

r

2

........(1)

ϵ r +1

where, c is the speed of light,

c = 3 × 10

fr is the resonant frequency, ϵr

f

r

8

m/sec

= 2.4835GH z

is the dielectric constant of RT/Duroid substrate,

ϵ r = 2.33

substituting the values gives us, W = 47.44mm For Length, first determine the effective dielectric constant,

+1

−1

http://appliedelectronicsengineering.blogspot.in/2013/08/patch-antenna-design-tutorial-with-cst.html + ef f = r

r

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Patch antenna design tutorial with CST microwave - Electronics Engineering Tutorials ϵ ef f =

ϵ r +1 2

+

ϵ r −1 2

1 √ 1+

............(2) 12h W

ϵ ef f = 2.272

then find the extended incremental length, W

(ϵ eff +0.3)(

△L = 0.412 ∗ h

+0.264)

............

h W

(ϵ eff +0.258)(

+0.8)

h

(3) using the values we find,

△L = 1mm Now the length of the patch antenna can be obtained using the equation below, L =

c 2f √ϵ r r

−2∗

△L

........(4)

Substituting the known values we obtain the length of the patch antenna as, L = 39.618mm The next step is to determine the Inset feed point. What is the inset feed point? It is a point located inside the patch where the impedance of the feed microstrip and the patch antenna is matched or becomes equal and thus least amount of energy is reflected back to the microstrip and most of the energy is radiated from the antenna. Let the distance of the inset feed point be d from one of the edge of the patch antenna. Let us use a 50ohm microstrip feed and find the inset point where this 50ohm will match the input impedance of the patch antenna. The equation to find out the value of d is, R f ,in (d) = R p,in (0) ∗ cos

2

(

π∗d L

........(6)

)

where, R p,in (0) =

here

G1

1 2(G 1 ±G 12 )

........(7)

is the conductance at the entry slot and G12 is the mutual

conductance between the entry and second slot. Using approximation, 1

http://appliedelectronicsengineering.blogspot.in/2013/08/patch-antenna-design-tutorial-with-cst.html p,in (0) =

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Patch antenna design tutorial with CST microwave - Electronics Engineering Tutorials R p,in (0) =

The value of

1

........(8)

2G 1

is given by,

G1

Sin(k∗W )

cos(k∗W )+k∗W ∗S i (k∗W )+

G1 =

120∗π

−2

...............(9)

k∗W

2

where, k is the wave vector,

k =

2π λ

= 51.98m

−1

Substituting the value of W=46.8mm(0.0468m) and k=51.98 per m in equation (9), we obtain

G1 = 2.855 ∗ 10

−3

S

Now, using equation (8) we obtain, R p,in (0) = 175ohm

Substituting the values of

R p,in (0), R f ,in (d) = 50ohm

obtained

above in equation (6) and solving for d we get, − − − − − − d =

L π

cos

−1

(√

R f,in (d) R p,in (0)

)

d=12.697 mm Now we have to calculate the width of the microstrip feed line with impedance of 50ohm. The width of the microstrip line can be found out using microstrip line calculator such as ADS LineCalc or using the following formula120π

Zf =

W

√ϵ eff [

W

f

f

+1.393+0.667∗ln( h

+1.444)] h

............(5) Using the ADS LineCalc the width of microstrip feed W f and length were obtained as below-

W f = 2.291mm

and L f

= 31.949mm

We have calculated all the required dimension for the microstrip patch antenna design. Now continue reading Design of Microstrip antenna in CST Microwave Studio

http://appliedelectronicsengineering.blogspot.in/2013/08/patch-antenna-design-tutorial-with-cst.html

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designing circular microstrip patch This is the third and final part of antenna. In this tutorial a circular the Inset Fed Patch Antenna Design of patc[...] design tutorial using CST Microstrip antenna Microwave[...] in CST microwave Studio http://appliedelectronicsengineering.blogspot.in/2013/08/patch-antenna-design-tutorial-with-cst.html

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This is the second part of the Inset fed Patch antenna design tutorial using CST Microwave Studio. [...] 13 comments:

Varun February 13, 2014 at 3:28 PM Can you throw some light on equation (3)? How do we get the constants in the equation. Reply Replies Joao Rosa April 13, 2014 at 11:57 PM Two

scientists

presented

(Silvester

their

and

calculated

Benedek)

data

for

have excess

capacitance of the microstrip open circuit as polynomial equations for six different values of dielectric constant (er). It has been found possible to reduce those equations to one valid for all values of 'er' . Those constants are the result of that interpolation of equations and they are not exacly precise forr all values of 'er'. The factor "0.258" is wrong though, it should be subtracted and not added Reply

Susan lama

February 13, 2014 at 8:07 PM

i think that was from antenna textbooks but i forgot which one...let me know if you require it badly Reply Replies Björn March 6, 2014 at 4:29 PM Nice tutorial. I want to read something more about the designing of patch antennas. Could you give me the book titles which you have used for the first part of the tutorial? Reply

nur alias March 6, 2014 at 9:50 AM What is Si and Sin in equation 9 http://appliedelectronicsengineering.blogspot.in/2013/08/patch-antenna-design-tutorial-with-cst.html

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Reply Replies Susan lama

March 6, 2014 at 11:24 AM

Si(x) is a sine integral function and Sin is usual sine operator

nur alias April 8, 2014 at 7:00 AM How can I get the value of Si and Sin

nur alias April 8, 2014 at 7:01 AM How can I get the value for Si and Sin Reply

nur alias March 6, 2014 at 9:50 AM what is Si and Sin in equation 9 Reply

Huỳnh Thanh Bình March 24, 2014 at 8:34 PM please, I can not calculate the value of Lf and Wf I don't find equation in order to calculate the value of Lf. PLEASE HELP ME..........!!! Reply

Huỳnh Thanh Bình March 24, 2014 at 8:34 PM This comment has been removed by a blog administrator. Reply

Wang Fengzhou May 5, 2014 at 2:47 AM How to calculte of Wf and Lf? Reply

manmitha May 12, 2014 at 10:44 AM how to design a microstrip array by using cst tool..can any one help me... Reply http://appliedelectronicsengineering.blogspot.in/2013/08/patch-antenna-design-tutorial-with-cst.html

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