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Author

D. He

Bio: D. He is an academic researcher. The author has contributed to research in topics: Antenna rotator & Dipole antenna. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

Papers
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Proceedings ArticleDOI
14 Oct 2003
TL;DR: Paratek Microwave, Inc. as mentioned in this paper developed a multibeam phased array antenna system at 1.8 GHz, suitable for application as a smart GSM base station antenna.
Abstract: Paratek Microwave, Inc. developed a multibeam phased array antenna system at 1.8 GHz, suitable for application as a smart GSM base station antenna. The antenna is also capable of handling GPRS and EDGE extensions to the basic GSM system. The antenna array elements are phased using phase shifters based on Parasca/spl trade/ voltage tunable materials. An antenna system overview and a description of the basic operation will be given, followed by system simulation and pattern measurement results.

3 citations


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Proceedings Article
01 Oct 2008
TL;DR: The simulation results reveal that employing the switched beam system provides higher performance in term of carrier-to-interference ratio and throughput, compared with adaptive antenna in GPRS system.
Abstract: As the users call for the improvement of the datarate in GPRS system, so far an adaptive antenna implemented at base station is envisaged to be the solution. However, this concept introduces the problems of high expense and complexity. Alternatively, a switched beam antenna avoiding those impairments is worthwhile considering. Therefore, this paper investigates into the use of switched beam antenna compared with adaptive antenna in GPRS system. To achieve a fraction of expense, the implementation is considered at the mobile station instead. The simulation results reveal that employing the switched beam system provides higher performance in term of carrier-to-interference ratio and throughput, compared with adaptive antenna. The obtained results also confirm the advantages of switched beam antenna even though the system is situated in non-line-of-sight environment.

2 citations

Proceedings ArticleDOI
09 May 2004
TL;DR: In this article, an optimum design procedure for pencil beam and spot beam arrays is presented, which involves determination of optimum element size and number of elements that fulfill a desired gain of a scanned beam.
Abstract: In this paper we present an optimum design procedure for pencil beam and spot beam arrays The procedure involves determination of optimum element size and number of elements that fulfill a desired gain of a scanned beam An illustrative example is presented to demonstrate the procedure It is found that such an optimum design could reduce 20% element counts while satisfying the gain requirement Three different types of radiating elements that are commonly used in phased arrays are examined from bandwidth and maximum scan angle point of views

1 citations

Proceedings ArticleDOI
16 Sep 2008
TL;DR: The trade off between throughput and array size is presented and it is shown that utilizing switched beam antenna at Mobile Station provides higher performance in term of C/I and throughput compared with using existing antenna.
Abstract: In last few years, a smart antenna has been envisaged to enhance the GPRS system implementing at Base Station. This results in the problem of complexity and expense. Alternatively, this paper considers employing switched beam antenna at Mobile Station, such as Laptop, instead. The simulation results reveal that utilizing switched beam antenna provides higher performance in term of C/I and throughput compared with using existing antenna. As being spaced by half-wavelength of the operational frequency, the array size is too large to build in Laptop. On the other hand, the reduction of array spacing affects the system throughput because of mutual coupling effect. Also, the decoupling techniques proposed in literatures are not practical for implementing in Mobile Station. Therefore, this paper also presents the trade off between throughput and array size. From the obtained results, we can reduce the array spacing according to the desired throughput. This is considerably useful for the GPRS designer.

1 citations