Normalized Radiation Pattern for Microstrip Patch Antenna. Microstrip antennas are becoming very widespread within the mobile phone market. The first step in the feednetwork design is to find the characteristic impedances Z1 and Z2 of quarter-wavelength transformers M1 and M2 to match the edge impedances to 50 ohms. Patch antennas are low cost, have a low profile and are easily fabricated. No portion can be reproduced except by permission from the author. The fabricated prototype dual-frequency patch antenna is shown in with the dimensions of the feed network summarized in the. Geometry of Microstrip Patch Antenna.
In this design, the line of Ms is chosen so that the input impedance is capacitive at the two frequencies and hence the length Ls needs to be one-quarter wavelength long at a frequency which is higher than 2. Antenna performance can also be analysed by using different structure of patches and feeding techniques. The patch is of length L, width W, and sitting on top of a substrate some dielectric circuit board of thickness h with. The purpose of thislow voltage standing wave ratio. . Experimental work is to design and enhance a rectangulardata show a reasonably good agreement microstrip patch antenna using the parametersbetween the simulation and measured results. To ensure the lengths of the two feed lines are long enough, length Ls was chosen to be one-quarter wavelength long at 9.
Microstrip patch antennas radiate primarily 103-105 Vol. The parameter specifications of rectangular microstrip patch antenna are mentioned in table 1. In order to reducethe size of the Microstrip patch antenna, substrates Feb. Higher gains are possible if lower-loss substrate materials are used, with gains of more than 5 dB possible. The height of the substrate is 1. Note that the fringing fields near the surface of the patch antenna are both in the +y direction. Consider the side view of a patch antenna, shown in Figure 4.
Marsi, Microstrip Antenna gain enhancement using left-handed metamaterial structure, progress in Electromagnetic Research M. The directivity of this antenna isIt is a complex number that has magnitude and 7. The equation 1 below waspermittivity, fringing effect, return loss used to work out the width of the patch. There is a more recent version of your browser available. S: Comments are appreciated and please subscribe! I have some questions,, 1 In the example given, the probe position is calculated to be 21 mm. The design graphs are then used to compute the dimensions of a rectangular patch and feed network for a dual-frequency antenna for use at 1.
So if you want to minimize the sidelobe, you have to optimize the distance between them. The width, W, is normally determined using Eq. After the fabrication of proposed antenna the antenna parameters like return loss and bandwidth are measured on the spectrum analyzer. The simulated S-Parameters are then exported to Microsoft Excel Program for verifying the Double-Negative properties of the proposed metamaterial structure. The rectangular patch and the dualfrequency feed network are shown in. Pendry, Negative refraction males a prefect lens, Phys Rev Lett, 85 2000 , pp.
Can i find this L, W and feed location using the software 2 Is it that truncating diagonal sides of the rectangular patch antenna will allow me to get the circular polarised? The thickness of the ground plane or of the microstrip is not critically important. The impedance bandwidth of the patch antenna along with the proposed metamaterial structure at 2. When this occurs, the voltage and current are out of phase. When matched to a 200 Ohm load, the magnitude of is shown in Figure 3. Where is this 21 mm? They proved that the array of metallic wires can be used to obtain negative permittivity and split ring resonators for negative permeability. The height h is taken to be 3 cm.
When you look at the Balanis's book, you will see that if the distance between the patch is more than one half wavelength, the pattern of the array has more sidelobe but the main lobe is more directive. Normaly, a patch antenna alone has a gain of about 6 dB. The array of 4 patch add a gain of 6 dB so your main lobe must have a gain of 12 dB. Balanis, Antenna Theory: Analysis and Design, 2nd ed. Next we'll consider more aspects involved in Patch Microstrip antennas.
Smith Chart in figure 11 shows the impedance variation within the simulated frequency range. The ground radiation and high gain as well. The normalized radiation pattern is approximately given by: In the above, k is the free-space , given by. Side view of patch antenna with E-fields shown underneath. If you believe your browser is up-to-date, you may have Internet Explorer's Compatibility View turned on.