Performance evaluation of a low‐cost switched‐beam antenna for WLAN users

Abstract

W g is the critical factors to determine the upper operating frequency, impedance bandwidth, and impedance matching.ABSTRACT: This article proposes a low-cost switched-beam antenna using single antenna element for WLANs. This octagonal-shape antenna allows eight beam-patterns, which can be controlled by shorted-circuit terminations at different edges. The prototype of proposed antenna is constructed and tested to demonstrate its beam steering capability, compared with simulation results. Also the prototype is tested under real circumstance in existing WLAN infrastructure. The measured results reveal that signal strength can be improved using the proposed antenna over omnidirectional antenna utilized in these days.ABSTRACT: This letter presents a novel bio-radar system with phaselocked loop (PLL) for noncontact measurement of vital sign. As the leakage of the phase noise of local oscillator (LO) through antenna is dominant factor for the distances larger than about 30 cm, the performance of a bio-radar system can be improved with the PLL employment. The proposed bio-radar and PLL are implemented by using conventional commercial components, and the measured result shows that the bio-radar system performance is greatly improved with a PLL without any additional digital signal processing.

A single element of multiband switched beam antenna for 5G applications

“…The paper presented in [28], a rectangular patch which fixed size and fixed position of feeding point at the center, directions of main beam can be switched by shorted circuit at terminal edges. Also, an octagonal patch which fixed feeding point at the center, radiation patterns can be controlled by shorted circuited condition at end edges were revealed in [29], [30]. Moreover, the work proposed in [31], a compact dual band switched beam antenna which radiation patterns can be steered by controlling shorting positions at end edges.…”

Beam Tracking in Switched-Beam Antenna System for V2V Communication

“…However, there are some limitations of an antenna having directional pattern such as hidden node problem and sometime cannot be used in some applications. The works in [13][14][15][16][17] indicated the powerful antenna technology which provided the reduction of interference effect and increasing the signal quality at the receiving vehicle. Smart antenna has been proposed for a solution.…”

A Dual-Band Single-Feed Switched Beam Antenna for WLAN

“…This is not considered practical as the feeding network is relatively complicated. The works of [7][8] have revealed a low profile antenna which is capable of beam switching in two directions and eight directions, respectively. They antenna is a simple structure using a single-layer printed circuit board.…”