*is article proposes a novel multiband antenna with “C + O” structure, which uses two classic circular letters and combines them. *e antenna is suitable for wireless applications such as second generation (2G), third generation (3G), fourth generation (4G), WLAN, and Bluetooth. *e antenna is based on the structural characteristics of the classic monopole antenna. It is a vertical quarter-wavelength antenna. *e radiator of the antenna is mainly composed of letters, and the radiator is symmetrical along the feeder line. *e antenna radiator is composed of “C + O” structure. *e antenna uses a coplanar waveguide feeding method. After actual testing, the antenna covers two frequency bands: 1.82–2.66 GHz and 3.46–3.72 GHz. *e center frequency points are 2.06 GHz and 3.68 GHz. *e antenna uses FR-4 dielectric material, the relative dielectric constant of the dielectric plate is 4.4, and the actual size of the antenna is 15 ×15 ×1.6 mmC. *e test and simulation have good consistency, which verifies that the proposed antenna meets the requirements of various wireless applications.
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