Optimization of the Integral Parameters of Disk Microstrip Antennas With Radiators of Complex Geometry

The Influence of a Circular-Patch Monopole Antennas Excitation Method on Their Integral Characteristics

“…It will be observed that this absolute minimum can be seen in a very narrow frequency band. A small change in the relative dielectric constant to the design value of 3.8 r   (about 2.6 %) shifts the minimum value of 11 S to a low frequency region. The resonant frequency is almost equal to the frequency of the spectral line of one of the eigenmodes of a disk with logperiodic discontinuities (Fig.…”

“…In addition, an important role is played by the method of excitation of the structure, more precisely, by the presence of additional functional elements. The permittivity value on influence 11 S in the frequency range will determine both degree of antenna matching with external circuits and radiation efficiency at certain frequencies. Dependencies of 11 S vs. frequency with variation of the relative permittivity values in case of a coaxial excitation ( Fig.…”

“…The information on sufficiently simple and technological ways of controlling the spectral composition of the excited oscillations can be found. Among them, one can point to the methods based on changing the structure of the current lines on the patch surface [10], and to methods based of the effect on the so-called phase excitation centers [11,12].…”

“…Further increasing of the relative dielectric permittivity value to 3.9 r   leads to a further shift into a low frequency band and increases the 11 S level. We may assume that at frequencies close to the minima of the reflection coefficient, an effective radiation can be detected.…”

“…Fig. 7 shows the changes of 11 S with variations of the r  value within 3.7 to 3.9 for the case of a structure excitation using the segment of microstrip line ( Fig. 1(b)).…”