Patch antenna slot feed

Zarreen Aijaz et al. / International Journal of Engineering Science and Technology Vol.2(1), , couples the patch to the feed line. The bandwidth is essentially . Progress In Electromagnetics Research B, Vol. 58, 35{46, Analysis of Microstrip Line Feed Slot Loaded Patch Antenna Using Artiflcial Neural Network.

Why are dual band antennas used instead of two single band antennas? Thickness of slot is so small that currents are not restricted to the edges of slot but spread out over the sheet Patch antenna is most preferred because of lower dielectric constant. Slots can be used in low frequency apps, but patches work best at UHF and above. Whereas the polarization of a dipole antenna is the same as the orientation of the elements, a slot antenna has a polarization 90 degrees from the orientation of the slots. What is the need for a microstrip patch antenna?

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A patch antenna is literally a patch of metal or other conductor on a flat surface. There may or may not be a ground plane on the other side of the substrate. The directionality, gain, polarization, and impedance are a function of the size and shape, and placement of the feed line. Most GPSs use a patch antenna. They don't have to be rectangular, they can even be circularly polarized.

Thanks to CST dot Com for the image and website describing the design and testing of this circularly polarized patch antenna: Thanks to EfieldSolutions dot Com, the green is copper:. A slot antenna is a slot in a flat piece of metal or other conductor. It can be thought of as sort of the complementary version of a dipole.

It can be fed in a number of ways. One common way is to place slots in a waveguide. With the right placement and spacing, a number of slots can act as a directional and effective antenna. Or it may be a slot in the ground plane on a PCB with the signal fed to the center edges, often a bit off center to match impedances. Whereas the polarization of a dipole antenna is the same as the orientation of the elements, a slot antenna has a polarization 90 degrees from the orientation of the slots.

Thanks to Feko dot Info, note that it is fed slightly off center to match impedance and match an unbalanced feedline to a balanced slot antenna:. Wide arrays can be made to gain the chosen directionality. Here is a log-spiral slot antenna that bolts onto the end of a waveguide.

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