scholarly journals Magneto Dielectric-Laden Miniaturized Wideband Meander Line Antenna for Mobile Devices

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Bancha Luadang ◽  
Rewat Senathong ◽  
Chuwong Phongcharoenpanich
Keyword(s):  
Current Distribution ◽  
Surface Current ◽  
Impedance Bandwidth ◽  
Optimal Parameters ◽  
Frequency Range ◽  
Surface Current Distribution ◽  
Coupling Element ◽  
Device Applications ◽  
Measured Impedance ◽  
Meander Line

This research presents a miniaturized wideband meander line antenna (MLA) using a magneto dielectric (MD) material for mobile device applications. The proposed MLA attached the lower and upper ground planes of the folder-type chassis, connected electrically by grounding strip. The MD material (ECCOSORB MF-124) was subsequently loaded onto the coupling element area of the MLA. The MD-laden MLA was ultracompact (10 mm × 25 mm × 1 mm), with the electrical size of 0.015λ × 0.039λ × 0.0015λ at 470 MHz. The surface current distribution was simulated to determine the optimal parameters of the MD-laden MLA. To verify, a prototype antenna was fabricated and the experiments were performed. The measured impedance bandwidth (S11<−6 dB) covered the frequency range of 467–1012 MHz (73.6%), with an omnidirectional radiation pattern. The radiation efficiency was in excess of 90%, rendering it suitable for the DVB-H/LTE13/GSM850/900 applications.

scholarly journals Computation of antenna pattern correlation and MIMO performance by means of surface current distribution and\\ spherical wave theory

2006 ◽  
Vol 4 ◽  
pp. 33-39 ◽  
Author(s):  
O. Klemp ◽  
G. Armbrecht ◽  
H. Eul
Keyword(s):  
Channel Capacity ◽  
Current Distribution ◽  
Spherical Wave ◽  
Surface Current ◽  
Wave Theory ◽  
Antenna Pattern ◽  
Mimo Channel ◽  
Computational Technique ◽  
Surface Current Distribution ◽  
Pattern Correlation

Abstract. In order to satisfy the stringent demand for an accurate prediction of MIMO channel capacity and diversity performance in wireless communications, more effective and suitable models that account for real antenna radiation behavior have to be taken into account. One of the main challenges is the accurate modeling of antenna correlation that is directly related to the amount of channel capacity or diversity gain which might be achieved in multi element antenna configurations. Therefore spherical wave theory in electromagnetics is a well known technique to express antenna far fields by means of a compact field expansion with a reduced number of unknowns that was recently applied to derive an analytical approach in the computation of antenna pattern correlation. In this paper we present a novel and efficient computational technique to determine antenna pattern correlation based on the evaluation of the surface current distribution by means of a spherical mode expansion.

scholarly journals Wideband Printed Wide-Slot Antenna with Fork-Shaped Stub

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 347 ◽  
Author(s):  
Ke Li ◽  
Tao Dong ◽  
Zhenghuan Xia
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Slot Antenna ◽  
Wireless Communication Systems ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Slot Antennas ◽  
Resonance Technique ◽  
Operating Frequency Range ◽  
Measured Impedance

This paper presents a multiple-resonance technique that sought to achieve a wide bandwidth for printed wide-slot antennas with fork-shaped stubs. By properly appending an extra fork-shaped stub onto the main fork-shaped stub, the impedance bandwidth was able to be clearly broadened. To validate this technique, two designs where the extra stubs were added at different positions of the main stub were constructed. The measured impedance bandwidths of the proposed antennas reached 148.6% (0.9–6.1 GHz) for S11 < −10 dB, indicating a 17.9% wider bandwidth than that of the normal antenna (0.9–4.3 GHz). Moreover, a stable radiation pattern was observed within the operating frequency range. The proposed antennas were confirmed to be much-improved candidates for applications in various wireless communication systems.

scholarly journals Spherical mode analysis of planar frequency-independent multi-arm antennas based on its surface current distribution

2006 ◽  
Vol 4 ◽  
pp. 25-32 ◽  
Author(s):  
G. Armbrecht ◽  
O. Klemp ◽  
H. Eul
Keyword(s):  
Current Distribution ◽  
High Speed ◽  
Near Field ◽  
Multiple Input Multiple Output ◽  
Data Communication ◽  
Surface Current ◽  
Mode Analysis ◽  
Surface Current Distribution ◽  
Diversity Techniques ◽  
Input Multiple Output

Abstract. Deployment in the design of mobile radio terminals focuses on the implementation of multiradio transmission systems, using a multiplicity of different radio standards combined with high-speed data communication over multiple-input multiple-output (MIMO) and multimode diversity techniques. Hence, planar log.-per. four-arm antennas are predistined to meet the requirements of future mobile multiradio RF-frontends and will be introduced and analysed in terms of an efficient spherical mode analysis by means of surface current distribution in order to derive an analytic access to MIMO- and polarisation-diversity performance computation. A remarkable parameter reduction and a faster numerical analysis with respect to conventional techniques may be achieved. The sources in the near-field antenna region are based on the numerical computation of surface currents involving the finite element method (FEM). Relations between the variations of the geometrical antenna parameters and the excitation of discrete spherical modes are presented and will be analysed in detail.

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