this paper presents a low-cost compact planar microstrip-fed monopole antenna and its four-element array design for ultra-wideband (uwb) wireless communication and target detection applications, respectively, operating in the frequency span of 3 ghz to 11 ghz. a prototype was fabricated and then measured based on optimal parameters. the results of reflection coefficient (s11) and radiation patt...

Hollow waveguide slot antennas, which have the features of low transmission loss and high cross-polarization discrimination (XPD), have been widely employed in communication and radar systems. The fabrication technique called “diffusion bonding of laminated thin metal plates” [1, 2] has been introduced in the realization of multi-layer waveguide structures with high massproductivity. The diffus...

This paper presents the design, simulation, and measurement of two low-cost broadband circularly polarized (CP) printed antennas: a single element and an array at C band. The proposed single element antenna is excited by an L-shaped strip with a tapered end, located along the circular-slot diagonal line in the back plane. From the array experimental results, the 3 dB axial ratio bandwidth can r...