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Synthesis of uniform amplitude unequally spaced antenna arrays using differential evolution algorithm
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
2003 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 0096-1973, Vol. 51, no 9, 2210-2217 p.Article in journal (Refereed) Published
Abstract [en]

A computationally efficient global optimizationmethod, the differential evolution algorithm (DEA), is proposedfor the synthesis of uniform amplitude arrays of two classes,i.e., unequally spaced arrays with equal phases and unequalphases. Phase-only synthesis and the synthesis of uniformly exitedunequally spaced arrays (position only synthesis) are comparedand it is seen that, by using the unequal spacing, the number ofarray elements can be significantly reduced for attaining reducedsidelobe levels. From the DEA-based synthesis of unequallyspaced arrays with uniform amplitudes and unequal phases, itis found that a tradeoff exists between the size of the unequallyspaced arrays and the range of phases for the same radiationcharacteristics. The proposed synthesis technique using uniformamplitudes, unequal spacing, and unequal phases (position-phasesynthesis) not only decreases the size of the array for the samesidelobe level compared to both the phase-only synthesis andposition-only synthesis but also retains their advantages.

Place, publisher, year, edition, pages
2003. Vol. 51, no 9, 2210-2217 p.
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-90652DOI: 10.1109/TAP.2003.816361OAI: oai:DiVA.org:uu-90652DiVA: diva2:163092
Available from: 2003-09-05 Created: 2003-09-05 Last updated: 2013-05-08Bibliographically approved
In thesis
1. Active and Passive Unequally Spaced Reflect-Arrays and Elements of RF Integration Techniques
Open this publication in new window or tab >>Active and Passive Unequally Spaced Reflect-Arrays and Elements of RF Integration Techniques
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Using an array synthesis tool based on a modified differential evolution algorithm, it is shown that the position-phase synthesis exhibits improved pattern characteristics compared to both the phase only and position only synthesis of uniform amplitude antenna arrays. The design of an unequally spaced planar reflect-array and an active power combining reflect-array are presented. The unit cell of the active reflect-array consists of an amplifying active reflect-antenna designed using a novel dual polarized microstrip-T coupled patch antenna. Two modelling approaches are proposed for the active reflect-antenna and the modelling methods are compared with the experiments.

A computationally efficient analysis of an H-slot in the ground plane of a microstripline is carried out using a transmission line model. To improve the accuracy in the resonant region of the H-slot and retaining the computational efficiency, an artificial neural network is combined with an efficient spectral domain method. An efficient analysis tool for a silicon micromachined H-slot coupled antenna is developed by combining the transmission line models of the H-slot and an aperture coupled antenna. The experimental results are compared with the theory showing good agreement.

The analysis and design of a microwave amplifier based on non-resonant slot matching is carried out. It is seen that the designed slot matched amplifier has decreased layout size, improved gain and noise figure characteristics compared to a stub matched amplifier. An efficient method for the analysis of non-resonant slots is compared with other approaches showing good agreement. This points to the fact that non-resonant slot matched circuits can be designed with the same speed and efficiency as we design the traditional stub based matching circuits.

To address the problem of bandwidth and performance of reflect-arrays we propose a dielectric resonator antenna with slotline stubs. As a preliminary step we design a dielectric resonator antenna with slotline feed and the experimental results are compared with those of a commercial CAD tool. Design and analysis of 3D interconnects based on non-radiative dielectric waveguides is carried out. At millimeterwave, these interconnects are useful for hybrid and multilayer integration techniques.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 109 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 865
Electrical engineering, Active Antenna, Reflect-arrays, NRD guide, RF integration, Elektroteknik, elektronik och fotonik
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:uu:diva-3520 (URN)91-554-5687-1 (ISBN)
Public defence
2003-10-01, K23, MAGISTERN, Dag Hammarskjölds väg 31, Dag Hammarskjölds väg 31, Uppsala, 13:30
Available from: 2003-09-05 Created: 2003-09-05Bibliographically approved

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Rydberg, Anders
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