Design of Circularly Polarized Waveguide Slot Linear Arrays

Abstract

A design procedure for circularly polarized waveguide slot linear arrays is presented. The array element, a circularly polarized radiator, consists of two closely spaced inclined radiating slots. Both the characterization of the isolated element and the evaluation of the mutual coupling between the array elements are performed by using a method of moments procedure. A number of traveling wave arrays with equiphase excitations are designed and then analyzed using a finite element method commercial software. A good circular polarization is achieved, the design goals on the far field pattern are fulfilled and high antenna efficiency can be obtained

Siw 2d Planar Array With Four Cross Slots Radiator and Tuning Vias

“…Two 45 • inclined and orthogonal radiating slots can be used to obtain circular polarization [2]. A separation of λ g /4 (λ g is the SIW wavelength) between +45 • and −45 • slots generates a 90 • phase difference between their corresponding linear E-field components.…”

“…A reflection cancelling slot is also incorporated to each radiating slot, as indicated in [3]. Likewise, the proposed structure provides the same coupling levels than the inclined slot pair element [2], but with a significant dimension reduction (around 15%).…”

“…During the last decades, Substrate Integrated Waveguide (SIW) technology has been consolidated as an alternative to conventional waveguides in millimeter and microwave applications [1][2][3]. SIW can be manufactured with a printed circuit board (PCB) process preserving the transmission characteristics of waveguides.…”

“…In the last years, many authors have characterized several kinds of single slot elements to obtain different radiation features and better performances in array configurations. Montisci presented an element formed by two inclined slots in [2], Chen et al introduced a four slot element based on a duplicate two slot radiator in [3], and Simmons used crossed slots in [5]. Even more, fractal slot elements have been used for some researches [6].…”

Structure-Based Evolutionary Design Applied to Wire Antennas

“…In many cases these two phases are almost independent, but for some mutual constraints, as in reflector (Collin, 1985) and slot (Costanzo et al, 2009;Montisci, 2006) or patch (Montisci et al, 2003) array synthesis, since in these cases there is a clear boundary separating the feeding and radiating part of the antenna. In other problems, as in wire antennas design (Johnson & Jasik, 1984), such phases are strictly interconnected, since no clear-cut divides the two parts.…”