i want the ppt for microstrip ring antenna please

mikropoloskovaâ antenna
In response, there are several types of microstrip antennas (also known as printed antennas), the most common of which is the microstrip antenna or antenna.
patch antenna
Antenna is a narrow-band, beam antennas manufactured the etched image antenna element in trace metal associated with insulating dielectric substrate, such as a printed circuit board with a continuous metal layer, associated with the opposite side of the substrate, which is obrazuetzazemleniâ. Common microstrip antenna form square, rectangular, round and elliptical, but any continuous shape is possible. Some Antennas do not use dielectric substrate and instead made from metal strips, mounted on a ground plane using dielectric spacers; the resulting structure is less strong, but has a wider bandwidth. Since such antennas have a very low profile, mechanically durable and can be shaped to fit the curved skin car, they are often mounted on the outside of the aircraft and spacecraft, or included in the mobile radio communications.
advantages
Microstrip antennas are relatively inexpensive to manufacture and design because of the simple 2-dimensional physical geometry. They are commonly used in microwave and high frequency because antenna size is directly related to the wavelength at the resonance frequency of a patch antenna provides maximum CPV is about 6-9 DB. It is relatively easy to print an array of spots on a single (large) substrate using lithographic techniques. Patch arrays can provide much higher returns than one patch at little additional cost; Coincidence and phase adjustment can be performed with printed microstrip feed structures, again in the same operations that form the radiating patches.The ability to create high gain arrays in low-profile antenna is one of the reasons that patch arrays are common on airplanes and other military purposes.
Such an array patch antennas is a simple way to make phased array antennas with dynamic ability to form a pattern.
Advantage inherent to patch antennas is the ability to have a variety of polarization. The antenna can be easily designed for vertical, horizontal, right hand circular (RHCP) or left-hand circular (left pie) polarization, using multiple power outlets, power point or one with an asymmetric structure patch. This unique property enables Antennas to be used in many types of communication lines, which may have different requirements.
Rectangular patch
The most frequent use of mikropoloskovaâ antenna is a rectangular patch antenna is rectangular, approximately half. wavelength section of rectangular microstrip line. When the air antenna substrate, the length of a rectangular microstrip antenna is approximately half of the free space wavelength. When the antenna is loaded with dielectric substrate antenna length decreases as the relative permittivity of the substrate increases. Resonance antenna length is a little shorter, because of long electric "fringing fields", which slightly increase the electrical length of the antenna of a microstrip antenna model early plot LINE microstrip with equivalent loads on both ends, to represent the radiation loss.
specifications
A microstrip antenna loading dielectric affects both the directional and impedance bandwidth. The dielectric permittivity of the substrate increases, the antenna bandwidth decreases which increases the q factor of the antenna and, consequently, reduces the impedance bandwidth. This relationship did not immediately follow when using antenna transmission line model, but obviously when the model cavity, which was introduced in the late 1970 's, Lo, etc. Radiation from a rectangular microstrip antenna may be understood as a pair of equivalent intervals. These slots act as a matrix and have the highest thrust when the antenna has an air dielectric, and decreases as the antenna is loaded material with increasing relative dielectric permittivity.
The rectangular microstrip antenna of half-wave has a virtual zakoračivaûŝuû plane along its Center. This can be replaced on the physical plane to make a mikropoloskovaâ antenna in a quarter of a wavelength. It is sometimes referred to as half-patch. Antenna has only one edge radiation (equivalent slot), which lowers the directivity/gain antenna. Bandwidth impedance, a bit lower than the full half-wave rectification, as the page link between the radiating ribs has been fixed.