a new compact ultra-wideband linear antenna array for target detection applications

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 patterns are shown and discussed. there is good consistency between the simulated s11 and the measured one. in addition, a 1 × 4 linear array design with the size of 100 mm × 34 mm has been proposed to achieve a higher gain. simulation shows that the array gain is increased about 6 dbi in comparison to the single element through the whole uwb frequency range. the proposed array has an average of -15 db side lobe level (sll) in the mentioned range. and also, a -23 db sll has been achieved by applying dolph-chebyshev amplitude distribution at 6 ghz. simulation results confirm that the antenna exhibits a constant bidirectional radiation pattern with a high and flat gain in case of the array design.