Circuit Modelling of Broadband Antenna Using Vector Fitting and Foster Form Approaches for IoT Applications

Abstract

Computation of the broadband antenna impedance behavior requires the wideband lumped equivalent circuit. This work aims to provide a comprehensive study of broadband antenna equivalent circuit models over broad frequency ranges for Internet of Things (IoT) applications using multiple approaches. The first approach is a Foster approximation, which is based on the antenna-simulated scattering parameters and impedance data. The second concerns a vector-fitting fitting approximation, which is based on the antenna-simulated impedance/admittance data. The studied antenna is modeled based on the radiating element’s geometry and the multifractal slots, in addition to the DGS (Defected Ground Plane) effects. Applying these techniques, wideband lumped equivalent circuits of the antenna have been computed which are in good agreement with measurement data. These models could be useful for the enhancement of the performance of a broadband antenna and its systematic design as well as offering the advantage of saving computation time for full-wave simulations and facilitating the solution of problems that have both an electromagnetic part as well as a circuit part. For further analysis, the Gaussian pulse has been generated to drive a time-domain analysis of the current and power response waveforms antenna behavior under load.

Approximating accelerator impedances with resonator networks

“…However, methods for executing this approximation appear to be primarily empirical in nature, and thus limited in the accuracy and sophistication of the resulting resonator networks. In other fields, however, optimization techniques along with utilization of a Foster Canonical Network (FCN) (more on this below) have been leveraged to represent generalized impedance responses in terms of RLC resonators [10][11][12][13][14][15]. Here, we will do the same, developing a partial-derivativebased procedural search algorithm that may be used to map broadband accelerator component data to quasi-equivalent resonator networks.…”

Coplanar Fed Quad-band Parasitic Patch Antenna for Ultra-wide Band Wireless Application

“…Zm12 and Zm23 are mutual coupling impedances between the outer ring-middle ring and middle ring-inner disk, respectively. The values of these impedances can be computed using the equations available in [10,[13][14][15][16][17][18]. The antenna input impedance Zin is also modelled using the Foster representation where each radiating structure is modelled as a parallel RLC circuit [13].…”

Low-Profile Broadband Dual-Polarized Dipole Antenna for Base Station Applications

“…Therefore, our AMC is a good alternative to the metal ground due to its wideband. The proposed AMC unit can be equivalent to an LC parallel resonant circuit using the equivalent circuit analysis method (ECM) [23,24], as illustrated in Figure 4. Periodical patches provide the grid inductance L p .…”