IFA and PIFA Size Reduction by Using a Stub Loading

Abstract

A proposed technique for size reduction of a conventional inverted-F antenna (IFA) and a planar inverted-F antenna (PIFA) by employing a reactive load generated by a short-circuited stub is presented. The reduction factor of both antennas is around 30%, and the main parameters of the devices are preserved, including a fractional bandwidth of 4% and a gain of −2 dB. Both antennas operate around 1.5 GHz.

A Decoupling Network for Resonant and Non-Resonant Sub-1 GHz MIMO Mobile Terminal Antennas With Improved Compactness and Efficiency

“…These antennas are designed to operate in the Sub-1 GHz band, a band which is expected to remain relevant for future technologies [20]. This work is focused on the implementation of decoupling network on common mobile terminal antennas, i.e., PIFA and CCE which potentially can be further miniaturized [21][22]. From the literature, such decoupling technique is mainly used in monopole antennas instead of PIFA and CCE [12][13][14][15][16][17], and are focused at decoupling antennas operating above 2.45 GHz [12,13,[15][16][17].…”