Antenna-Theory.com - Transient Fields Under a Microstrip Antenna Microstrip Antenna - Transient Fields (the Movie) On this page, I will present a movie showing the fields under a microstrip antenna. In this numerical experiment, a short pulse will be launched from the end of a microstrip, which will travel towards the patch antenna. Some of the pulse will radiate away, and some of the power will be reflected back down the microstrip line. This type of simulation gives a little bit better idea of what is going on with a patch antenna, specifically when short pulses (short waveforms, or brief applied voltages) are incident upon a microstrip antenna. Specifically, consider a patch antenna that is mounted on a ground plane, with a dielectric with equal to 2.2. The thickness of this dielectric is 0.795 mm (millimeters). The patch antenna will be 1.25 centimeters wide and 1.56 centimeters long (you should be able to tell what frequency this antenna will radiate well at - if not, see page). Microstrip Patch Antenna CalculatorFringing Effects. The dimensions of the patch are finite along the length and width, so the fields at the edges of the patch undergo fringing. This is illustrated along the length in Figures 5.9 for the two radiating slots of the microstrip antenna. The amount of fringing is a function of the dimensions of the patch and the height. ![]() The microstrip antenna will feed the patch offset from the center, as shown in Figure 1. Offset feed for Patch Antenna. The transient pulse will be of the form given by exp(-(t-T0)/T )^2, where T0 is the time delay and will be 45 pS (picoseconds, 10^-12), and T is a parameter that controls the rate of rise and fall, which is 15 pS. Vir2 instruments electri6ity torrent. This function is plotted in Figure 2. Incident (transient) pulse fed to a Patch Antenna. In the following video, we will view the z-directed electric field, immediately below the patch antenna. Note that the surface of the patch is normal to the z-axis.
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