Design of reactive parasitic elements in electronic beam steering arrays

Abstract

A new approach for the design of electronic beam steering arrays with reactive parasitic elements is introduced. The method is demonstrated at the example of a circular array formed by capacitively tuned monopoles. The related capacitances are determined straightforwardly and without any need for optimization techniques. The resulting beams are rotatable and maintain their gain and beamwidth within tight margins. Comparisons with NEC2 verify the pattern calculation.

Ant Colony Optimisation-based radiation pattern manipulation algorithm for Electronically Steerable Array Radiator Antennas

“…In [2], an analytical approach was adopted for the same optimisation problem. In this example, a six-element UCA was used with radiators located at radius l/4 around the centre element.…”

“…In this example, a six-element UCA was used with radiators located at radius l/4 around the centre element. The added capacities in [2] were allowed to vary within the range of 0.1-10 pF, the operating frequency is 2.484 GHz. This analytical approach optimises the electric field.…”

“…Finding the correct reactances to achieve a desirable radiation pattern is a highly non-linear problem and an optimisation method, in a deterministic or stochastic way, is required to find the correct reactances. In [2] the authors circumvene difficulties by introducing an analytical approach to ESPAR beamsteering. However, this approach is restricted to control only the direction and magnitude of the main beam's radiation vector magnitude.…”

A Low-Cost Phased Array Antenna Integrated With Phase Shifters Cofabricated on the Laminate

“…In switched beam system, switching components are used in the RF front-end to switch the direction of radiated beam or the null to reduce cochannel interference. Such digital beam steering approaches [8] are practical and hence are currently popular up to low microwave bands. On the other hand analog radio frequency (RF) beam steering systems are required at higher frequencies.…”

Mutual coupling compensation in uniform circular arrays with center element using a coupling matrix based on phase modes

“…In this contribution, we extend the model in [1] by constructing a coupling matrix for UCAs with an additional antenna element [2][3][4], placed in the center of the array. Given the phase-mode description for the UCA with center element in Section II, the coupling matrix is constructed in Section III.…”