- INPUT IMPEDANCE PATCH ANTENNA HOW TO
- INPUT IMPEDANCE PATCH ANTENNA PATCH
- INPUT IMPEDANCE PATCH ANTENNA SIMULATOR
You may need to sweep a wide range if your shape is far off. Select a start and stop frequency to sweep over and the increment, then hit Apply. You will need to set the frequencies at which to simulate: Options->Project Options. To measure the resonance, Project-> Add Graph and then add measurement Linear->Zin. With the feedport added you can now run a simulation. The port can be added by selecting Edge Port (see below) and adding it to the lower edge of the small feed rectangle you created. Below is an example.īelow is a zoomed view of the small feed rectangle and the attached port.
INPUT IMPEDANCE PATCH ANTENNA PATCH
1mm and place it at the center of the patch where the feedline would go. To better approximate a real t-line port, draw a very small rectangle, 2.3mmx. If you just added a port to one side of the patch, AWR/NI would stimulate the entire edge.
INPUT IMPEDANCE PATCH ANTENNA SIMULATOR
Once you have sized your patch, you need to add a port so the simulator can send in a stimulating wave. Note that this is a delta and not an absolute size. While dragging if you hit the space bar, a window will come up that allows you to type in the dx and dy of the new rectangle. You can simply grab and drag with the mouse. To resize, you can double click the rectangle and you will see blue dots appear at the corners. Resize the patch to be the dimension you calculated above. The file has loaded the default enclosure (surrounding space) and many of the fabrication properties. This includes a small rectangular patch of copper. Load the example AWR/NI file on the workshop site ( click here).
INPUT IMPEDANCE PATCH ANTENNA HOW TO
You will need to try adjustments in the simulation to get a feel for how to optimize your design for 950 MHz. To provide some intuition, the length of the patch is similar to a quarter wavelength transmission line. The input impedance can be calculated analytically, however we will find it using AWR/NI EM simulator. Dielectric constant is 4.5 and thickness is 1.53 mm. You can use this online calculator to find the approximate values. Finally the length can be calculated, accounting for the fringing fields, as:.Due to the fringing fields, the electrical length of the patch is longer than its physical length.The effective permittivity is calculated as.Where v o=3×10 8, f o=950 MHz and e r=4.5.The length of the patch (the portion parallel to the feed structure) is calculated in three parts. The width of the patch antenna (the part perpendicular to the feed line) is calculated as:.The following video will provide design guidelines and a tutorial.įor the microtstrip patch antenna, the following design procedure can be used: We will first focus on the basic patch design and then examine impedance matching techniques. Numerous reference books contain equations for antenna design for many types of antennas. In antenna design, it is common to select a topology and then lookup the design equations for that antenna. The general dimensions are /2, however due to the specific dynamics of the antenna and the fringing fields, the exact dimensions require more careful calculations. In this part of the workshop you will design a microstrip patch antenna. The basics of operation is to generate a magnetic field out of phase with an electric field with a ratio that impedance matches with the air (377 Ohms).Īt the bottom of this tutorial are three links to antenna basics and more detail on patch antenna theory. The theory of antenna operation can be seen in the following videos. In this part of the workshop you will design a 0.95GHz patch antenna.
0 kommentar(er)
