THE INFLUENCE OF A CIRCULAR-PATCH MONOPOLE ANTENNAS EXCITATION METHOD ON THEIR INTEGRAL CHARACTERISTICS

• Main Authors: S. A. Pogarsky, L. M. Lytvynenko, D. V. Mayboroda, A. V. Poznyakov
• Format: Article
• Language: English
• Published: National Academy of Sciences of Ukraine, Institute of Radio Astronomy 2018-06-01
• Series: Radio Physics and Radio Astronomy
• Subjects: disk microstrip resonator; slot radiator; mode of excitation; matching; directivity diagram
• Online Access: http://rpra-journal.org.ua/index.php/ra/article/view/1290

Purpose: The question of the influence of modes of excitation of disk monopole antennas of microstrip topology on the antenna general properties is considered. The purpose of work consists in determination of the optimum method of antenna excitation for increasing the antenna matching level with the external microwave chains and its influence on the antenna energy characteristics. Design/methodology/approach: The modeling of antenna general properties is made by using the finite element method (FEM). The modeling is carried out within the model of a half-open resonator formed by the two metal surfaces (a grounded base and just a strip conductor), on which the condition of electric wall is fulfilled, and also by the cylindrical surface on which the condition of magnetic wall is fulfilled. In modeling, usually the thin substrate h<<λres is assumed, where h is a substrate thickness, λres being the resonance wave-length in a resonator. For such an assumption we may affirm that the vector of an electric field in a resonator will not have variations along the coordinate being perpendicular to the structure plane, and in the resonator, the prevailing types of oscillations will be oscillations E mn0 (TM mn0 ). In modeling, special attention has been paid to the mutual coupling of just a disk resonator and the resonator formed by a coaxial line segment. Findings: The information on the influence of the mode of excitation of disk monopole antenna with microstrip topology on the antenna general properties: spectral characteristics, degree of antenna matching with external chains, and energy characteristics with variation of substrate dielectric constant values is obtained. Conclusions: The data obtained testify that the monopole disk microstrip resonators with the complex-composite topology of radiators can provide a high level of integral characteristics and form the radiated fields with the required characteristics.