Advances in loading techniques to design multifrequency monopole antennas

Abstract

A top‐loading technique for monopole antennas which permits us to obtain a multiband performance from a wide set of antenna geometries is presented. Dual‐band and a triple‐band monopole antenna designs are described in detail, featuring both similar input impedances and radiation pattern across the different bands. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 434–437, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20162

A Quad-Band CPW Fed Slot Antenna Array for Lte and Wimax Applications

“…Many CPW-fed multiband antenna designs have been proposed [14][15][16][17][18][19][20][21][22][23][24][26][27][28], including several operating below 2 GHz, and such topology has also been widely used to design UWB antennas. While various approaches have been adopted to achieve multi-band antenna operation for planar antennas, a widely used method to achieve this is to introduce slots in the ground plane or in the radiating element [14][15][16][17][18][19][20][21][22].…”

“…However, as the placement of multiple slots easily modifies the surface currents on the antenna, the design procedure needs to be performed systematically to ensure the achievement of the desired frequencies and bandwidths. An antenna based on a bow-tie monopole presented in [23] uses the top-loading technique to enable multi-band resonance in the structure. Meanwhile, researchers in [24,25] introduced parasitic elements which are shortened with the ground plane to facilitate the generation of resonant modes for tri-band operation.…”