Capacitor-Inductor-Loaded, Small-Sized Loop Antenna for Wlan Notebook Computers

Abstract

Abstract-A small-sized loop antenna loaded with the series-connected capacitor and inductor for wireless local area network (WLAN) operation is proposed. The main radiator of an L-shaped, loop structure and its small ground were constructed on a single-layered FR4 substrate of thickness 0.8 mm and occupied a miniature size of 5 mm × 20 mm only. It was found that by loading the series-connected capacitor and inductor between the antenna feed port and the loop radiator, the quarter-wavelength loop resonance can be easily excited together with the controllable half-wavelength resonance. The design prototype was able to operate in the 2.4-GHz (2400-2484 MHz) and 5.8-GHz (5725-5825 MHz) WLAN bands. The proposed antenna was simple in structure and yet provided dual-band operation and good radiation performance.

Small‐sized, decoupled two‐monopole antenna system using the same monopole as decoupling structure

“…The antenna height of the design, including the small antenna ground, is 5 mm, which can be fitted into the narrow-bezel space of the notebook computers. [7][8][9][10] With the proposed method, good isolation better than 15 dB between the antennas over the bands can be attained, compared with the reference case without decoupling monopole (see Figure 4A). Details of the design prototype are described and discussed in this article.…”

“…Yet none of these designs utilize the same geometry of the antenna radiator as the decoupling structure. The minimum lateral length of these two‐antenna designs is >40 mm and the antenna height is also >6 mm, making these two‐notebook antenna designs not applicable to the recent narrow‐bezel notebook computers …”

“…The two‐monopole antenna system occupies a size of 5 mm × 40 mm (about 0.04 λ × 0.32 λ at 2.4 GHz), which is the smallest footprint (200 mm 2 ) among those two‐antenna designs of 2.4 and 5 GHz for notebook applications in the open literature. The antenna height of the design, including the small antenna ground, is 5 mm, which can be fitted into the narrow‐bezel space of the notebook computers . With the proposed method, good isolation better than 15 dB between the antennas over the bands can be attained, compared with the reference case without decoupling monopole (see Figure A).…”

“…The minimum lateral length of these two-antenna designs is >40 mm 4 and the antenna height is also >6 mm, 5 making these two-notebook antenna designs not applicable to the recent narrow-bezel notebook computers. [7][8][9][10] In this study, we demonstrate a simple decoupling technique that is obtained by duplicating the same radiator but grounding its feed port to the antenna ground for achieving enhanced isolation in the 2.4 and 5 GHz bands. The design consists of two identical radiating monopoles and the same monopole grounded between the two monopoles.…”

Very-Low-Profile, Decoupled, Hybrid Two-Antenna System Using Top-Loaded, Coupled Strip Resonator for Notebook Computer Applications

“…All these designs either require a minimum lateral length greater than 35 mm [7] or an antenna profile of higher than 7.5 mm [8]. These dimensions cannot fulfill the goal of accommodating more antennas in limited space and being fitted into the narrow bezels requested by recent notebook computers [9][10][11][12], in which the bezels of the notebook display can be as narrow as 5 mm.…”