Analysis of mutual coupling between a finite phased array of dipoles and its feed network

Abstract

An analysis of the mutual coupling effects between a finite phased array of dipoles and its feed network is presented. The feed network is typically a corporate feed consisting of split-tee power dividers cascading to form a certain power distribution over the aperture. A simple iterative approach is used to solve for the interaction between elements and feed. The radiation impedances of a finite dipole array are first found for a given voltage excitation. These radiation impedances are then used as loads for the feed network, and n + 1 port network prohlem is analyzed. Due to the interaction between the feed network and the dipoles, the antenna parameters such as mismatch, antenna pattern, and gain are all affected. These effects can be determined from the analarray with a corporate feed are given to show the resultant voltage standing-wave ratio (VSWR) of the feed and pattern degradation due to the mutual coupling effects.

Enhancing robustness of handset antennas to finger loading effects

“…It is well know from microwave theory that an array of in-phase radiating elements presents the same return loss at the input port of the feeding system as the return loss of the single element. However, if a phase delay is introduced, for example to achieve a certain beam-tilting, the bandwidth may be enhanced at the input port owing to the non-constructive sum of all the reflections coming from each radiator [5]. This principle of array theory is applied here in order to obtain not only a broadband antenna, but also a more insensitive system to finger loading effects than the one using a single element.…”

A Comparative Analysis of Evolutionary Algorithms for Synthesis of Scanned Linear Array of Mutually Coupled Parallel Dipole Antennas

“…The task of steering the array radiation pattern with the inclusion of mutual coupling is indeed a difficult task. Literature review [9][10][11][12][13] has reported about synthesis of antenna arrays in presence of mutual coupling. A quick look at the synthesis of the arrays shows the support that evolutionary algorithms produced in them.…”

Realistic calibration method for mobile base-station array antennas with multi-reflection of feed circuits and mutual couplings between radiating elements taken into account

“…There are design methods for array antennas that take account of the mutual coupling between radiating elements [5][6][7][8] and the mutual coupling between the elements and the feed circuit [9]. However, these studies discuss only antenna elements but not applications to sub-array configurations, and there is no mention of calibration.…”