ACFr Og DNVQv Gjeu 1Y9VRc FQkx 7ct TZHIt Cdd ZRk Xz MT1XY24DRi4Xi9m737D-yp PIe 49dk Sn F 6k S86Min Tra w Bx1s0o EBz De SB 0KCKs NTtdkf Y 64PVe In SUFWtefzn QJDW 8Wf H 2 Sxibyadf 4p PDF

Preview

Summary

Download ACFr Og DNVQv Gjeu 1Y9VRc FQkx 7ct TZHIt Cdd ZRk Xz MT1XY24DRi4Xi9m737D-yp PIe 49dk Sn F 6k S86Min Tra w Bx1s0o EBz De SB 0KCKs NTtdkf Y 64PVe In SUFWtefzn QJDW 8Wf H 2 Sxibyadf 4p PDF

Description

Experiment 3 Aim of the Experiment: To design Yagi-Uda Array antenna and to find the directivity and Half power beam width form the radiation patterns. Software(s) required: CST Studio Suite (Student edition) Theory: Refer to any standard text book Design Problem: Design a three element Yagi-Uda Array for operation in 1 GHz. Obtain the radiation patterns and hence find the half power beam widths. Initial dimensions: length of the feeder= 0.47λ length of the reflector=0.5λ length of the director=0.406λ spacing between reflector and feeder=0.25λ spacing between feeder and director=0.34λ After that the dimensions are fine tuned using various parametric studies and final dimensions are only given in the design steps. Design Steps Step 1: Save as the project created for dipole antenna in previous experiment. Step 2 (creation of director): Go to modeling then select cylinder and press escape in your computer and following window will pop up. As the radius of the cylinder is 2.5 mm and the material is chosen s PEC, then edit as shown below

Page 1 of 6

Experiment 3 Step 3(creation of reflector): Go to modeling then select cylinder and press escape in your computer and following window will pop up. As the radius of the cylinder is 2.5 mm and the material is chosen s PEC, then edit as shown below

The final 3 element Yagi-Uda array will appear as follows

Step 4: Go to simulation and then set up solver. Then start simulation. After the simulation is over, observe S11 from the navigation tree.

Page 2 of 6

Experiment 3

Observe that the antenna is resonating at 1 GHz. Step 5: Go to navigation tree then 2D/3D results, then right click on farfield (f=1)[1], then following window will pop up. Do the settings for E field pattern as shown below.

Press OK to visualize the E field pattern.

Page 3 of 6

Experiment 3

Observe that half power beam width is 64.4 deg. Step 6: Go to navigation tree then 2D/3D results, then right click on farfield (f=1)[1], then following window will pop up. Do the settings for H field pattern as shown below. Press Apply and OK to observe the H field pattern.

Page 4 of 6

Experiment 3

Observe that we get a directional radiation pattern in H plane unlike simple dipole antenna. And HPBW in H plane is 99.8 deg. Step 7 (Determination of directive gain): Go to post processing, then result template. In the result template, choose "Farfield and Antenna Properties" and "Farfield result" from the drop down menu. Then a window titled "Farfield Result" will pop up. Then go to All Settings. Then following window will pop up. Then do the necessary changes as shown. Also click on Plot Mode in the following window and check the linear scaling. press OK.

The template will now appear in "Template Based Post Processing" window. Click on Evaluate to get the following result.

Page 5 of 6

Experiment 3

Observation: Directivity of the simulated Yagi-Uda array is 5.6 which is much higher than dipole antenna simulated in previous experiment at 1 GHz. Design Problem for students: Design of Yagi- Uda array with more number of directors.

Page 6 of 6...