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In this article, a compact planar monopole antenna for ultra-wideband applications with band-notched characteristic is presented. The antenna with a small size of 30 mm  39.3 mm operates from 2.57 to over 12 GHz with return loss larger than 10 dB and the radiation patterns similar to that of dipole antennas. A pair of ground stubs locating along the edge of the ground plane is used to create the band-notch characteristic. The band notch covers the wireless area network band from 5.15 to 5.825 GHz. The center-notch frequency and notch bandwidth can be adjusted using the dimensions of the ground stubs. Prototype of the proposed antenna is designed, fabricated, and studied. The band-notched characteristics, return loss, radiation patterns, peak gains, and efficiencies of the antenna are studied using both computer simulation and measurements.ABSTRACT: In this article, a new antenna is introduced for ingestible capsule endoscope systems. As capsule endoscope systems are supposed to operate in the human body and they transmit internal image data with high resolution to external receivers, a wideband small antenna is required. To obtain these properties, the proposed antenna is designed in the form of thick-arm spiral structure. The total height of the antenna is 5 mm and the diameter is 10 mm. The fractional bandwidth of the proposed antenna is 21% with VSWR < 2, which is wide enough for WBAN in body communication and it has the isotropic radiation pattern.