Multi-Antenna Solutions for Long Term Evolution (LTE) Advanced
Ahmed Abdelsamad Abdelmonem Asaker;
Abstract
This thesis presents an antenna design which can be used in LTE-A applications. Initially, describe the analysis and design of the single element microstrip antenna. The bandwidth of the conventional patch is enlarged by using etched slots at the antenna patch to cover the LTE-A uplink frequency band range from 2.5 up to 2.57 GHz as of today’s standard based on 36.101 Table 5.5-1 (March 2012). The designed antenna has been fabricated by using thin film and photolithographic technique and has been measured by using the Vector Network Analyzer. The simulated and measured results were found to have good match with each other. The total area of the fabricated single element antenna is (60mm*50mm).
Then using the designed single-element antenna, a two - element MIMO system has been designed employing polarization diversity. The minimum separation between antenna elements to be decoupled equals 0.13λ ̥. This separation is smaller compared to the conventional arrays which should be separated by 0.5λ ̥ where λ ̥ is the free space wavelength.
In order to enhance the isolation between the microstrip elements, different decoupling methods based on various mechanisms have been studied for the proposed two-element MIMO antenna system. First technique is to place a designed rectangular metal-structure between the two spaced polarized MIMO antenna elements. The second method is to cut a simple rectangular slot in the ground plane centered between the two spaced polarized microstrip antenna elements. The third method is to introduce narrow, closely spaced rectangular slots in the ground plane centered between the two microstrip elements.
In the proposed decoupling method, a combination of the first and second methods has been employed resulting in a significant reduction of the mutual coupling across antenna operating frequency band.
By using the proposed decoupling method, the separation between the microstrip elements was reduced to be 0.075λ ̥ rather than 0.13λ ̥ without missing decoupling between antenna elements.
Then using the designed single-element antenna, a two - element MIMO system has been designed employing polarization diversity. The minimum separation between antenna elements to be decoupled equals 0.13λ ̥. This separation is smaller compared to the conventional arrays which should be separated by 0.5λ ̥ where λ ̥ is the free space wavelength.
In order to enhance the isolation between the microstrip elements, different decoupling methods based on various mechanisms have been studied for the proposed two-element MIMO antenna system. First technique is to place a designed rectangular metal-structure between the two spaced polarized MIMO antenna elements. The second method is to cut a simple rectangular slot in the ground plane centered between the two spaced polarized microstrip antenna elements. The third method is to introduce narrow, closely spaced rectangular slots in the ground plane centered between the two microstrip elements.
In the proposed decoupling method, a combination of the first and second methods has been employed resulting in a significant reduction of the mutual coupling across antenna operating frequency band.
By using the proposed decoupling method, the separation between the microstrip elements was reduced to be 0.075λ ̥ rather than 0.13λ ̥ without missing decoupling between antenna elements.
Other data
| Title | Multi-Antenna Solutions for Long Term Evolution (LTE) Advanced | Other Titles | تقنية الهوائيات المتعددة في تطور المدي البعيد المتقدم | Authors | Ahmed Abdelsamad Abdelmonem Asaker | Issue Date | 2015 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| G11504.pdf | 482.89 kB | Adobe PDF | View/Open |
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