Uniplanar Printed Coupled-Fed PIFA With a Band-Notching Slit for WLAN/WiMAX Operation in the Laptop Computer

Lower Bound for the Radiation $Q$ of Electrically Small Magnetic Dipole Antennas With Solid Magnetodielectric Core

“…The conclusion is that for a given antenna electrical size ka there is an optimum magnetic core permeability (10) that ensures the lowest possible Q as given in (11). This Q is thus the lower bound for magnetic dipole antennas with solid magnetodielectric core.…”

Analysis of PIFA antenna coupling in nearby traces and reduction with CSRRs in PCB at 2.45 GHz

“…Typical PIFA performance consists of bandwidth≥100MHz, VSWR≤2.5 and efficiency≥60%. Those antennas are typically used for commercial standard applications included in the 2.45 GHz industrial, scientific and medical (ISM) radio band [4][5]. Meanwhile, the complementary split-ring resonators (CSRRs) are used to implement a type of metamaterials, the so-called single negative effective media (SNG) with electric permittivity, ε<0 [6].…”

Multiband and Wideband Planar Antenna for Wlan and Wimax Applications

“…Much attention has been focused on designing multiband antenna which can operate at both WLAN and WiMAX frequency bands [1,2]. Most proposed multiband antennas in handheld devices are planar inverted-F antennas (PIFA) and monopole antennas.…”

“…Most proposed multiband antennas in handheld devices are planar inverted-F antennas (PIFA) and monopole antennas. PIFA antennas have several significant advantages such as small size, reduced backward radiation, and low profile [1][2][3]. However, narrow-bandwidth characteristic of individual mode is one of the limitations for PIFA, and its 3D structure may be a fabrication challenge [4].…”