#Microstrip antenna theory and appliction Patch
Methods for broadbanding are then discussed, followed by dual- and multiband designs, size reduction techniques, circularly polarized patch antennas, and frequency-agile and polarization-agile designs. This chapter begins with a brief description of the modeling techniques and basic characteristics of the MPA. From reference 4 design of multilayer aperture coupled stacked microstrip patch antenna for WLAN application, observations such as operating frequency is 2.51 GHZ, antenna consist of 3 FR4. In the last three decades, extensive studies have been devoted to improving the bandwidth and other performance characteristics. From the book Antenna Theory by Balanis, the basic information about antenna and antenna parameters as well as calculations performed over here was taken. In its simplest form, it uses a conducting patch one-half wavelength long, so that the metal surface acts as a resonator similarly to the half-wave dipole antennas.
The most common type of microstrip antenna is the so-called patch antenna, which is fabricated with PCB technology by etching the shape of radiating patch above a dielectric substrate backed by a ground plane. A: A microstrip antenna, also called a patch antenna or printed antenna, is an antenna which is primarily a two-dimensional flat structure (Figure 6. It began to attract the serious attention of the antenna community in the 1970s, as antenna designers began to appreciate the advantages offered by this type of antennas, which include low profile, conformability to a shaped surface, ease of fabrication, and compatibility with integrated circuit technology. Since then, microstrip antennas have been a subject of extensive research and development for military and commercial applications. The patch antenna idea appeared to be originated in the early 1950s, but there was little activity for almost two decades, mainly due to its inherent narrow bandwidth. In the stripline case, energy is coupled to the patch in several ways: by direct connection, by proximity coupling, and by aperture coupling. In the coaxial case, the center conductor is directly connected to the patch and the outer conductor to the ground.
The antenna is usually fed either by a coaxial probe or a stripline. The basic geometry of a microstrip patch antenna (MPA) consists of a metallic patch which is either printed on a grounded substrate or suspended above a ground plane.
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