MIMO handheld antenna design approach using characteristic mode concepts

Abstract

In summary, we proposed and demonstrated a C band TEDFL which employs a BFM and a TFBG to form the laser cavity. The BFM acts as a broadband reflector both for the lasing signal and pump source. At pumping power of 100 mW, stable laser output power of 21.35 dBm is obtained with the threshold pumping power as small as 4.7 mW. A SMSR of 57.9 dB and 16 nm tuning range are demonstrated. This BFM-based TEDFL with graceful features as mentioned may find vast applications in fiber optics communications and fiber sensor technology. , Temperature-tuned erbium-doped fiber ring laser with polymer-coated fiber grating, Opt Commun 202 (2002), 331-334. ABSTRACT: In handheld communications devices there is not much room for the placement of antennas. This problem is exacerbated when more than one antenna is needed for use in a MIMO communications system. It is then useful to be able to utilize some of the existing device structure to form the required antennas. In this article, we show how the characteristic mode theory can be used to achieve this in a way that results in antennas with the low envelope correlation preferred for MIMO antennas. ABSTRACT: A broadband, circular switched parasitic array with two active elements, suitable for DVB-T applications at the V-UHF band is designed with the aid of a genetic algorithm. Numerical as well as measurements results are presented for a single switch position. Simulation results are also presented for switched-beam array operation, using the measured antenna radiation patterns.

Analysis of slot-based radiators using TCM and its application in MIMO antennas

“…TCM was applied on the analysis of various different types of antennas such as wire antennas, handset antennas, printed MIMO antennas, and slot antennas . In Ref.…”

“…TCM was applied on the analysis of various different types of antennas such as wire antennas, 21 handset antennas, 22 printed MIMO antennas, [23][24][25] and slot antennas. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] In Ref.…”

Design of a multiband ground radiation antenna by utilizing balun excitation

“…Particularly, the capability to operate at multiple frequency bands is highly preferable. Owing to the multiple wireless communication operations and the finite space for the radiator provided inside the compact handset, the concept of the chassis radiator, such as the ground plane, has been considered into radiation for enhancement of bandwidth and radiation efficiency . The theory of the characteristic mode has been utilized to analyze the orthogonal Eigen patterns and Eigen modes of the ground plane (the chasis) .…”

“…Owing to the multiple wireless communication operations and the finite space for the radiator provided inside the compact handset, the concept of the chassis radiator, such as the ground plane, has been considered into radiation for enhancement of bandwidth and radiation efficiency. [1][2][3][4] The theory of the characteristic mode has been utilized to analyze the orthogonal Eigen patterns and Eigen modes of the ground plane (the chasis). [4][5][6] First, the analysis of excitation modes of the rectangular ground-plane prototype is investigated.…”

Modal significance measure in characteristic mode analysis of radiating structures

“…Introduction: The usefulness of characteristic modes [1] in providing insight into antenna properties and design has recently been revived and described by several authors [2][3][4][5][6][7]. In the interests of brevity we use the notation of [1] and assume readers are familiar with its contents.…”