Compact Reconfigurable Antennas for Wireless Systems and Wearable Applications

Reconfigurable antennas have attracted a lot of attention especially in future wireless communication systems. Superior features such as reconfigurable capability, low cost, multi-purpose functions and size miniaturization have given reconfigurable antennas advantage to be integrated into a wireless systems. In this chapter, two types of reconfigurable antennas are discussed. First, frequency reconfigurable narrowband microstrip slot antenna (FRSA) is presented. The proposed antenna is designed to operate at six reconfigurable frequency bands from 2 GHz to 5 GHz with bidirectional radiation pattern. The second antenna design is frequency reconfigurable narrowband patch-slot antenna (FRPSA) is presented. The antenna is a combination of a microstrip patch and slot antenna. Nine different narrow bands are produced by tuning the effective length of the slot. The performances of the antenna in term of simulated and measured results are presented. In conclusion, good agreement between the simulated and measured results has been attained.

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Performance of link adaptation algorithms and reconfigurable antennas for MIMO-OFDM wireless systems

2012 46th Annual Conference on Information Sciences and Systems (CISS) ◽

10.1109/ciss.2012.6310795 ◽

2012 ◽

Cited By ~ 1

Author(s):

George D. Sworo ◽

Moshe Kam ◽

Kapil R. Dandekar

Keyword(s):

Wireless Systems ◽

Link Adaptation ◽

Reconfigurable Antennas ◽

Mimo Ofdm

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Electrical Reconfiguration Techniques for Frequency Agility in Patch Antennas

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.b6257.129219 ◽

2019 ◽

Vol 9 (2) ◽

pp. 3406-3411

Keyword(s):

Wireless Systems ◽

Reconfigurable Antennas ◽

Patch Antennas ◽

System Complexity ◽

Effective Utilization ◽

Wide Range

Wireless Systems are subjected to overwhelming advancements with the exponential demands in the field of Communication. This has led to the evolution of Reconfigurable antennas which gained enough significance as they are capable of modifying them.selves to different operating frequencies, patterns or polarizations. Out of these, Frequency Reconfigurable Antennas which can be operated at multi-frequency environment have been found to have a wide range of applications. The reconfiguration can be achieved using various switching mechanisms like, electrical, optical, etc. These are found to support various communication standards, ensure effective utilization of spectrum, reduce system complexity and hence cost. The recent researches on frequency reconfigurable antennas using electrical switches are analyzed in this paper based on their performances and a comparison on various switching techniques is presented.

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Experimental Results of Novel DoA Estimation Algorithms for Compact Reconfigurable Antennas

International Journal of Antennas and Propagation ◽

10.1155/2017/1613638 ◽

2017 ◽

Vol 2017 ◽

pp. 1-13 ◽

Cited By ~ 1

Author(s):

Henna Paaso ◽

Aki Hakkarainen ◽

Nikhil Gulati ◽

Damiano Patron ◽

Kapil R. Dandekar ◽

...

Keyword(s):

Antenna Arrays ◽

Wireless Systems ◽

Doa Estimation ◽

Reconfigurable Antennas ◽

Line Of Sight ◽

Next Generation ◽

Estimation Algorithms ◽

Left Handed ◽

Potential Use ◽

Good Agreement

Reconfigurable antenna systems have gained much attention for potential use in the next generation wireless systems. However, conventional direction-of-arrival (DoA) estimation algorithms for antenna arrays cannot be used directly in reconfigurable antennas due to different design of the antennas. In this paper, we present an adjacent pattern power ratio (APPR) algorithm for two-port composite right/left-handed (CRLH) reconfigurable leaky-wave antennas (LWAs). Additionally, we compare the performances of the APPR algorithm and LWA-based MUSIC algorithms. We study how the computational complexity and the performance of the algorithms depend on number of selected radiation patterns. In addition, we evaluate the performance of the APPR and MUSIC algorithms with numerical simulations as well as with real world indoor measurements having both line-of-sight and non-line-of-sight components. Our performance evaluations show that the DoA estimates are in a considerably good agreement with the real DoAs, especially with the APPR algorithm. In summary, the APPR and MUSIC algorithms for DoA estimation along with the planar and compact LWA layout can be a valuable solution to enhance the performance of the wireless communication in the next generation systems.

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