When designing printed wide-slot antennas, the shape or profile of the tuning stub is a key geometric structure that affects the\nimpedance bandwidth of the antenna. This article introduces a new process for designing tuning stub shapes, which are the\nblended results of a diamond and a circle. By using different geometry shapes, the design could generate a series of bandwidths\nwith a regular trend. Detailed investigations and analysis were conducted on some key geometry parameters to explore their\nimpact on the impedance bandwidth of the antenna. To certify the new design method, several prototypes were simulated,\ndeveloped, and measured. The experimental and simulated results showed good agreement with each other. The results indicate\nthat by properly selecting various blended shapes, a BW range from 80.1 to 117.3% for a VSWR of less than 2 could be\nobtained, which provides a convenient model for a wideband antenna design.
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