Hongkoo Lee

Two-layered ground radiation antenna for high efficiency applications

In this paper, a novel technique is proposed that is applicable to cases in which two-layered ground planes exist to achieve high radiation performance. The proposed ground radiation antenna is composed of a radiating loop and a feeding loop, which are built into separate two-layered ground planes. The feeding loop and radiating loop are located on the small top-layer ground plane and the large bottom-layer ground plane, respectively, so that two loops are magnetically coupled to each other, and the large bottom-layer ground plane is then excited as a radiator. The reference antenna is built with a radiating loop and a feeding loop only on the top-layer ground plane. High performances are achieved both in simulation and measurement.

Miniaturized quadruple-band ground radiation antenna for mobile devices

A miniaturized quadruple-band ground radiation antenna within a small clearance of 7 mm × 10 mm × 1 mm is proposed for 1.575 GHz GPS band, 2.4 and 5 GHz Wi-Fi bands, as well as 3.5 GHz WiMAX band in mobile devices. The −6 dB (VSWR < 3) impedance bandwidths of 38, 121, 114, and 542 MHz are achieved, covering the GPS band, Wi-Fi 2.4GHz band, WiMAX 3.5GHz band, and Wi-Fi 5 GHz band, respectively.