scholarly journals Large Screen Enabled Tri-port MIMO Handset Antenna for Low LTE Bands

2020 ◽  
Author(s):  
Hanieh Aliakbari ◽  
Liying Nie ◽  
Buon Kiong Lau
Keyword(s):  
Design Procedure ◽  
Mode Analysis ◽  
Total Efficiency ◽  
Characteristic Mode ◽  
Large Screen ◽  
Antenna Performance ◽  
Resonant Modes ◽  
Metal Plates ◽  
Measurement Results ◽  
Port Design

In recent years, the screen-to-body ratio of mobile handsets has been increasing. Today, the screen nearly fills up the entire front side. Conventionally, the screen is mainly seen as a metallic object that adversely affects antenna performance. In this paper, the large screen is used for the first time to facilitate an additional uncorrelated MIMO port in a tri-port design, for several LTE bands below 1 GHz. To this end, the design procedure explicitly considers the screen together with the terminal chassis, which can be simply modelled as two metal plates. In particular, characteristic mode analysis of the double-plate model enables a sufficient number of resonant modes to be created, tuned and selectively excited to yield three uncorrelated MIMO ports in the low band. Simulation and measurement results are found to be in good agreement. The measured bandwidths of the three ports are 23%, 17% and 21%, respectively. Within the operating band, the measured isolation is above 13 dB, envelope correlation coefficient below 0.16 and average total efficiency above 72%.

scholarly journals Large Screen Enabled Tri-port MIMO Handset Antenna for Low LTE Bands

2020 ◽  
Author(s):  
Hanieh Aliakbari ◽  
Liying Nie ◽  
Buon Kiong Lau
Keyword(s):  
Design Procedure ◽  
Mode Analysis ◽  
Total Efficiency ◽  
Characteristic Mode ◽  
Large Screen ◽  
Antenna Performance ◽  
Resonant Modes ◽  
Metal Plates ◽  
Measurement Results ◽  
Port Design

In recent years, the screen-to-body ratio of mobile handsets has been increasing. Today, the screen nearly fills up the entire front side. Conventionally, the screen is mainly seen as a metallic object that adversely affects antenna performance. In this paper, the large screen is used for the first time to facilitate an additional uncorrelated MIMO port in a tri-port design, for several LTE bands below 1 GHz. To this end, the design procedure explicitly considers the screen together with the terminal chassis, which can be simply modelled as two metal plates. In particular, characteristic mode analysis of the double-plate model enables a sufficient number of resonant modes to be created, tuned and selectively excited to yield three uncorrelated MIMO ports in the low band. Simulation and measurement results are found to be in good agreement. The measured bandwidths of the three ports are 23%, 17% and 21%, respectively. Within the operating band, the measured isolation is above 13 dB, envelope correlation coefficient below 0.16 and average total efficiency above 72%.

scholarly journals Design of a Dual-Band Frequency Reconfigurable Patch Antenna Based on Characteristic Modes

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Zakaria Mahlaoui ◽  
Eva Antonino-Daviu ◽  
Adnane Latif ◽  
Miguel Ferrando-Bataller
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
Design Procedure ◽  
Dual Band ◽  
Mode Analysis ◽  
Characteristic Mode ◽  
Band Frequency ◽  
Lower Band ◽  
Varactor Diodes ◽  
Characteristic Modes

A frequency reconfigurable patch antenna design based on the characteristic mode analysis is presented. The antenna presents a reconfigurable lower band and a steady band at higher frequencies. A slot is etched on the ground plane of the antenna, where two varactor diodes are placed on each side of the slot in order to tune the lower band. The first resonant frequency shifts down by varying the reverse voltage of the varactor, whereas the second operating frequency keeps stable. The proposed antenna is designed to cover WLAN bands, offering a first band operating at 2 GHz and a second band ranging from 5.3 GHz to 5.8 GHz. A prototype has been fabricated and measurements are provided, which validate the proposed analysis, method, and design procedure.

Small UWB antenna with two stop bands by a compact EBG cell loaded with new open meander slots

2021 ◽  
pp. 1-10
Author(s):  
Farzad Alizadeh ◽  
Changiz Ghobadi ◽  
Javad Nourinia
Keyword(s):  
Transmission Function ◽  
Ultra Wideband ◽  
Mode Analysis ◽  
Electromagnetic Bandgap ◽  
Uwb Antenna ◽  
Characteristic Mode ◽  
Operating Frequency Range ◽  
High Responsiveness ◽  
Measurement Results ◽  
Multiple Input

Abstract In this paper, a small ultra-wideband (UWB) antenna with two stop bands by a compact electromagnetic bandgap (EBG) cell loaded with two new open meander slots is presented. With the coupling of the EBG cell to the feedline, the stop bands are formed. The designed EBG cell is a mushroom type that has the advantages of being able to independently control the stop bands, high responsiveness selectivity of stop bands, easy switching, the need for fewer EBG cells, and low impact on the working characteristics of the antenna. To have a better understanding of the proposed EBG mechanism, characteristic mode analysis is used. The size reduction of the suggested antenna is obtained by halving the reference antenna relative to the axis of symmetry. The measurement results for −10 dB adaptation are from 2.73 to 13 GHz with stop bands at 3.51 GHz (12.9%) and 5.34 GHz (14.1%). The radiation behavior of the minimized antenna is similar to that of a reference antenna. Minimized UWB antenna with transmission function and group delay with small variations in the operating frequency range is suitable for small multiple-input and multiple-output (MIMO) and diversity systems.

scholarly journals Bandwidth Optimization of a Textile PIFA with DGS Using Characteristic Mode Analysis

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2516
Author(s):  
Bashar Bahaa Qas Elias ◽  
Ping Jack Soh ◽  
Azremi Abdullah Al-Hadi ◽  
Prayoot Akkaraekthalin ◽  
Guy A. E. Vandenbosch
Keyword(s):  
Wireless Body Area Network ◽  
Simulation Software ◽  
The Body ◽  
Mode Analysis ◽  
Area Network ◽  
Defected Ground Structure ◽  
Characteristic Mode ◽  
Antenna Structure ◽  
Rectangular Patch ◽  
Conventional Optimization

This work presents the design and optimization of an antenna with defected ground structure (DGS) using characteristic mode analysis (CMA) to enhance bandwidth. This DGS is integrated with a rectangular patch with circular meandered rings (RPCMR) in a wearable format fully using textiles for wireless body area network (WBAN) application. For this integration process, both CMA and the method of moments (MoM) were applied using the same electromagnetic simulation software. This work characterizes and estimates the final shape and dimensions of the DGS using the CMA method, aimed at enhancing antenna bandwidth. The optimization of the dimensions and shape of the DGS is simplified, as the influence of the substrates and excitation is first excluded. This optimizes the required time and resources in the design process, in contrast to the conventional optimization approaches made using full wave “trial and error” simulations on a complete antenna structure. To validate the performance of the antenna on the body, the specific absorption rate is studied. Simulated and measured results indicate that the proposed antenna meets the requirements of wideband on-body operation.

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