Phased arrays of probe-fed stacked microstrip patches

Abstract

This paper presents calculated and measured results for infinite phased arrays of probe-fed stacked rectangular and circular microstrip patches. A numerical model is described that is based on a rigorous Green's functiodGalerkin solution. In this solution, the connection of one or more vertical probe feeds to each patch is accurately modeled using a special attachment mode basis function, which is derived from the corresponding cavity model solution. Numerical results for both linearly and circularly polarized arrays are obtained. Measured results from a waveguide simulator are also presented and used to validate the numerical model. David M. Pozar (S'74-M'8GSM'88-F'90) for a photograph and biography, please see p. 220 of the February 1993 issue of this TRANSACTIONS.

A Method of Moments Analysis of a Microstrip Phased Array in Three-Layered Structures

“…The spacing between the two adjacent elements is The results given above are very similar to the results in [7] and [9]. The model developed in this paper can be easily simplified to that in [7] and [9].…”

“…First, although (9) presents the attachment mode current on the patch as an infinite summation, ten terms are shown to be sufficient for the summation to achieve the needed accuracy since the speed of convergence has been accelerated in the analysis. Second, the elements of the matrix are determined by (19), (24)-(27) and each term in the infinite summation represents a Floquet mode of periodic structure, thus we should truncate the infinite summation.…”

“…Thus, it has a broader bandwidth. Lastly, we must make proper expansion of the currents on the patches so as to include the edge effects of the currents, based on the results in [7][8][9]. We have found the current (m x , m y ) = (1, 0), (3, 0), (5, 0), (7,0) in the x-direction and (m x , m y ) = (0, 2) in the y -direction both meeting the prescribed resolution, in which the mode (1, 0) is the main cavity mode while the mode (0, 1) represent the component of cross section, so that six or seven modes are needed only in this computation (for the lowest patch one attached mode should be included).…”

“…For an infinite microstrip patch array, we can simplify the problem into a cell in a unit space by using the Floquet theorem [7][8][9]. In order to analyze the feature of the elements of the phased array, we first formulate the dyadic Green's function in this structure.…”

“…2(a). This structure is general and it can be reduced to the structure used in [9] by letting h 3 = 0, ε r3 = 1 , and W x3 = W y3 = 0 . It is assumed that the thickness of the intermediate layer, h 2 , is very small as compared with the thickness of the bottom, h 1 .…”