Fundamental specifications of patch antennas radiation pattern a patch antenna radiates power in certain directions and we say that the antenna has directivity usually expressed in dbi. Results the designed microstrip patch antenna with four slits and a pair of truncated corners are simulated using cadfeko for finding the electric far field radiation, gain, directivity, radiation pattern e. Theoretical analysis of a fourfeed circular patch antenna with cp oam modes. The rectangular patch excited in its fundamental mode has a maximum directivity in the direction perpendicular to the. If the antenna had a 100% radiation efficiency, all directivity would be converted to gain. Microstrip antennas have high q q 100 is common, which means that they have small bandwidths. Next well consider more aspects involved in patch microstrip antennas. The beamwidth is similar in both the x and y planes, creating roughly a cone of radiation outward from the patch.
The proposed dual layer microstrip patch antenna has an impedance. This type of isotropic antenna is said to have no gain. No gain can be expressed in linear terms like x1 times 1. Improvement of efficiency parameter of a microstrip patch.
Hfss simulation of radiation pattern of patch antenna with. Generation of broadband highpurity dualmode oam beams. The slot radius was chosen through sweeping the radius in the simulation from zero to 8 mm. This paper presents an 8shape slotted microstrip patch antenna. Measured circular ring patch antenna s11 db at wlan. Gain enhancement of a microstrip patch antenna using a reflecting. Antenna engineers like logarithmic terms, and we say this nogain situation is 0 dbi pronounced. Measured circular ring patch antenna eplane copol radiation pattern. Microstrip antenna an overview sciencedirect topics. The 3d radiation pattern of the designed antenna and 23. The directivity of patch antennas is approximately 57 db. Directional patch antenna array design for desktop wireless internet.
Substrate, gain, radiation pattern, patch antenna scientific. I have designing microstrip patch antenna and was getting gain and directivity as around 9. Controlling radiation pattern of patch antenna using transformation. The fields are linearly polarized, and in the horizontal direction when viewing the microstrip antenna as in figure 1a well see why in the next section. The basics of patch antennas, updated orban microwave. The geometries of the circular patch antennas excited by two feeds and. International journal of networks and communications 2018, 82. Compact dual band antenna design for ku ka band applications. The fields of the microstrip antenna are plotted in figure 2 for wl0. This would be an antenna with a perfect fronttoback ratio where all radiation occurs towards the front and no. For typical patch construction, the 3 db beamwidth is about 65 degrees, or 32. The proposed antenna provides high radiation efficiency and a peak gain of about 8 db at the resonant frequencies with reduced side lobe levels. That simply means that all directions have the same energy radiation, and are all equal to the average energy radiation.
The bandwidth of a single patch microstrip antenna does not exceed 2% and its gain is limited to 58 db. Keywords radiation efficiency, rectangular microstrip patch antenna, resonating frequency, total efficiency. This causes radiation at the two edges of the antenna, as shown by the fringing fields in. But i was getting the value of efficiency in negative.
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