天线仿真软件4nec2

The Horn Antenna

Horn antennas are extremely popular in the microwave region. In this tutorial, our

objective is to analyze a horn antenna resonating at a frequency of 11.3 GHz.

Here are the dimensions for this tutorial (the dimensions of the antenna were taken from a

tutorial example from the user manual of HFSS v. 5):

• Air box: 6 in x 4 in x 3 in.

• Horn top: 1.944 in x 2.65 in

• Distance from the horn top plane to the bottom is 5.475 in and from the horn top plane

to the base of the horn is 5.16 in.

Setting the Project preferences

• Set Units to inches. 3D Modeler< Units select in and click Ok.

• Set Solution type. HFSS<Solution type, check driven modal and click Ok.

Drawing the base of the Horn

The base of the horn has a uniform rectangular cross section, the width is 0.4 inches,

the length is 0.9 inches, and the height is 0.315 inches. To draw the base, create a 3D

rectangular box and set its dimensions with the template that is displayed.

• Click the Box icon or go to Draw<Box. Enter the following values -0.2, -0.45, and 0

for x, y and z, respectively and 0.4, 0.9, 0.315 for dx, dy, and dz, respectively. The

top of the 3D antenna base.

Draw<Rectangle. Now move the cursor to one corner of the top of the antenna base,

and click on it, then move the cursor to the opposite corner of the top of the antenna

base and click again. The rectangle window is open. Type funnel_base. Assign

material to be vacuum. Choose Color and Transperancy of your preference. Click

Ok. Note that the dimensions of the rectangle should match those of the top of the

antenna base.

Drawing the Horn Aperture

Next, draw the 2D rectangle that represents the top of the funnel, or the aperture of the

horn.

create the 3D, funnel-shaped object.

Choose the horn_top and funnel_base from the Model tree by holding down the Ctrl

key. Go to 3D Modeler< Surface< connect. Name it funnel.

Note that the object that is created as a result of connecting or uniting other objects can

not be edited. When connecting 2D objects, for example, you can edit the original 2D

objects, but you can not edit directly the 3D object that is the result of using the connect

command.