Wideband polarization-agile planar microstrip patch array antenna

Abstract

A planar polarization-agile printed antenna consisting of four corner-fed stacked patches suitably connected to a central aperture-coupled stacked patch to form a five-ofdice array configuration is presented. The excitation is dispensed to the whole array through the element at the centre, which is directly coupled to a pair of open-stub ended microstrip lines by a cross-shaped aperture. As a result, polarization agility operation can be achieved by using a single phase-switching circuit to deliver appropriate input signals at the antenna ports. The design concept is described and its potential is discussed on the basis of the simulation results obtained by the Method of Moments (MoM). In particular, two different antenna configurations featuring either a single-or a double-layer feed network to most favour simplicity of construction or polarization purity are investigated.

Symmetrical series‐fed dual‐polarised microstrip antenna lattice with odd number of radiating elements

“…A concept of such a slot‐coupled single patch is shown in Fig. 2 b and it is similar to the centre radiating element in a polarisation‐agile antenna array presented in [22, 23]. In this element, (i) the part of power delivered through the feeding line to port #1 is further guided through this line to port #2 exciting consecutive parallel linear antenna arrays, (ii) the part of the power coupled to the patch is radiated and (iii) the remaining part of this power is equally split, delivered to ports #3 and #4 with 180° differential phase shift and further distributed to the remaining parts of the linear antenna array.…”

“…In [24], series feeding has been performed with additional microstrip‐line sections, whereas in [9, 10] through‐element feeding has been utilised. The aperture‐coupled microstrip patches presented in this paper, however, have been used to divide and further distribute the excitation signal across an antenna array, which has been realised by combining the methods presented in [15, 22, 23]. The inputs of feeding lines at the bottom metallisation layer are facing outside of the antenna lattice, as shown in Fig.…”