Comparison of measured and calculated antenna sidelobe coupling loss in the near field using approximate far-field data

Abstract

Abstract-Computer programs are presently in existence to calculate the coupling loss between two antennas provided that the amplitude and phase of the far field are available. However, for many antennas the complex far field is not known accurately. In such cases it is nevertheless

Investigation on Wireless Link for Medical Telemetry Including Impedance Matching of Implanted Antennas

“…Prior to estimating the link, including the implanted antenna, the link was evaluated using the two microstrip patch antennas placed in a free space. The coupling formula was used to compute the coupling versus the separation distance and the coupling versus the transverse displacement [ 16 , 17 , 18 ]. In this section, the coupling formula is applied to both of the antenna displacements.…”

“…The antenna coupling was evaluated for the first scheme with the inclusion of a rotational one, as shown in Figure 7 a. For an accurate estimation, the rotation angles are restricted to the angles which are smaller than = 30° [ 17 ]. Therefore, the coupling curves were obtained at the rotation angles = 0° and = 30°.…”

“…Based on the transmission integral, an integral form of coupling formula has been developed in order to provide the convenience of using an easily attainable far-field pattern [ 16 ]. The formula provides an enormous capacity to compute the near-field or far-field antenna coupling, which is not restricted to the type of antenna or the motion of the antenna [ 16 , 17 , 18 , 19 , 20 ]. Advancements in the formula have been made in terms of its widespread applicability to electromagnetic problems.…”

Revisiting the Analysis of Radiative Mid-Range Wireless Link for Pacemakers

“…The derivation of the related formulas, applications, and measurements have been profoundly discussed in [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. The formulas based on the available far-field data are appropriate to obtain the power transmission between two antennas.…”

“…An approach to the generalization of the Friis formula based on the fundamental Gaussian beam has been proposed by Chu [ 31 ]. While the formulas are related to the rapid calculation based on the simple far-field gain, the integral coupling takes advantage of the fast Fourier transform (FFT) based on two vector far-field patterns [ 32 , 33 , 34 , 35 , 36 , 37 ]. This feature allows diverse scenarios of the wireless link to be easily computed from far-field patterns obtained from measurements or full-wave simulations.…”