The invention relates to an ultra-
wideband microstrip antenna, in particular a multi-order alternately-nested recursive hollowed ring ultra-
wideband antenna. The multi-order alternately-nested recursive hollowed ring ultra-
wideband antenna has the advantages of
high impedance bandwidth, low
return loss, high
gain, excellent
radiation characteristic, simple structure and easiness in
processing, and can be excellently applied to UWB (Ultra-
Wide Band) communication systems. A
dielectric substrate is provided; a favorable conductor layer is laid on the upper surface and the lower surface of the
dielectric substrate respectively; the favorable conductor layer at the upper surface of the
dielectric substrate is provided with a radiating patch which is provided with a multi-order alternately-nested recursive hollowed ring and adopts a rectangular
microstrip feeder to perform feeding; the basic structure contours of multi-order alternately-nested recursive structures are square and circular; a circular groove is formed at the interior of the square radiating patch so as to form a hollowed ring structure, and next-order square and circular alternately-nested structures are formed sequentially at the interior of the circular groove so as to from recursive hollowed ring structures, and therefore, the multi-order alternately-nested recursive hollowed ring can be formed; and the favorable conductor layer at the lower surface of the
dielectric substrate is provided with multi-order ladder-shaped gradient
electromagnetic coupling ground plates which are in
bilateral symmetry; and the width of the multi-order ladder-shaped gradient
electromagnetic coupling ground plates varies gradually.