A new planar inverted-F antenna with a very large bandwidth starting from 817 MHz to 11.5 GHz (VSWR < 3) is proposed as an alternative for high performance mobile phones intended to cover the major part of the mobile phone frequencies worldwide as well as the ultra-wideband (UWB) frequency range. A prototype of the antenna was constructed and the reflection coefficient and radiation patterns were measured to demonstrate an adequate radiation performance. The antenna dimensions of 4 × 2.5 × 0.5 cm 3 are compatible with the requirements imposed by the most recent commercially available smartphones. Besides, the easy construction without a matching network or a complicated geometry is an additional feature that can be reflected in low fabrication cost.

In this article, a combination of an elliptical UWB monopole with a series of Sierpinski triangle iterations inscribed in the planarized radiator is used to develop a highly‐impedance stability UWB antenna, performing from 700 MHz to 9 GHz. The fractal iteration is introduced in order to obtain a radiator size reduction and to improve the current distribution stability. With this implementation, a 31% radiator area reduction is obtained compared to a conventional circular or elliptical radiator. The antenna impedance matching is maintained over the entire bandwidth, even when an external lossy dielectric body is around or even in contact to the radiator. The antenna presents quasi‐omnidirectional radiation patterns and a gain around 0 dBi and group delay variations lower than 2 ns, making it suitable for short‐pulse communications systems and on‐body communications applications. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:635–641, 2017

This article describes a very wideband planar inverted‐F antenna antenna that covers the frequencies from 1.73 to 10.25 GHz with S11 < ‐10 dB. This wideband encompasses the operating bands of mobile services such as DCS, PCS, LTE, WiMAX, WiFi, Bluetooth, and the major part of the ultrawideband spectrum. This new antenna has adequate radiation characteristics and dimensions of 4 × 2 × 1 cm3 that are suitable to be integrated in mobile terminals. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:313–316, 2014

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A new very broadband planar inverted‐F antenna (PIFA) operating from 1.64 to 8.62 GHz with S11 < −10 dB is presented. The antenna has a volume of 4 × 2 × 1 cm3 and exhibits adequate radiation characteristics. It has the largest wideband reported for a PIFA‐type antenna and can be used for services such as DCS, PCS, LTE, WiMAX, WLAN, and Bluetooth. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:886–890, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27409