Abstract
In this paper, theoretical study of circular microstrip antenna loaded by two annular rings (CMSAL2AR) and calculation the contribution of the adjacent modes and studied positively or negatively affected on the antenna's coefficients (Bandwidth and Directive Gain).The proposed antenna using principle equivalence with moment of method formulation of electromagnetic radiation to find unknown electric current density on the conductor surface , and both unknowns electric and magnetic density current on the dielectric surface which are responsible for the generation of far fields radiation in the space for the components (Eθ ,Eφ) . From the radiation pattern can be calculated with contribution of the adjacent mode. The directive gain increased to (G= 19.92 dB) and bandwidth has been better (BW%= 19.9%) when this contribution is affect positively at the ratioRab=5.5 and Rab=6.5respectively.
Highlights
In recent years, the microstrip antenna is one of the most important type's antennas that took a great interest in both theoretical, experimental researches and engineering applications due to lightweight, small size and ease manufacturing
The third part is a ground plane, which is made from a good conductor printed on the other side of the dielectric substrate, [1, 2]. the microstrip possess a very narrow frequency bandwidth and low efficiency .There are many methods that significantly reducing the effect of the problem mentioned above, and many researches have devoted their studies to improve these coefficients
The proposed design, which study the contribution of the adjacent mode, shown an increased whenever the interference between them and the main mode occurs
Summary
The microstrip antenna is one of the most important type's antennas that took a great interest in both theoretical, experimental researches and engineering applications due to lightweight, small size and ease manufacturing. The first part is a radiating patch, which is usually made from a good conductor materials printed on one side of a dielectric substrate, which is the second part. The third part is a ground plane, which is made from a good conductor printed on the other side of the dielectric substrate, [1, 2]. the microstrip possess a very narrow frequency bandwidth and low efficiency .There are many methods that significantly reducing the effect of the problem mentioned above , and many researches have devoted their studies to improve these coefficients. A number of theoretical and experimental researches have been done to improve the bandwidth of the antenna [3]. Loading of shorting pins and stacking of patches are some techniques to increase the bandwidth of microstrip antennas [4]. Mathematical Analysis crostrip antenna loaded two annular ring) is used
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