Nizamudin Hussain, Performance Limitations and Estimates for Infinite Array Antennas
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
A novel quantitative measure for predicting the performance of arrays is tested on a few selected wide band arrays. This measure is called the array figure of merit. It is valid for lin-early polarized, infinite planar arrays, which are backed by a perfectly conducting ground plane. It predicts performance of arrays (which are free from grating lobes) in the E- or H-plane. The array figure of merit builds on the low frequency asymptotic expansion of the reflection coefficient and a sumrule of Rozanov type for passive structures. This measuretakes values between zero and one, and estimates array's performance on the basis of four key trade-off parameters:return loss, scan range, array thickness, and bandwidth. Arrays were found that yield values as high as 0.67, thus indicating a high performance array with respect to this measure. The sensitivity of the array figure of merit with respectto scan range is studied. Trade-off between bandwidth andreflection coefficient is investigated with respect to the ar-ray figure of merit. Finally an infinite array of stronglycoupled dipole elements is modeled and simulated. For this array, we test the sum rule based measure and find a veryhigh value for this measure: 0.84 - with 1 as its theoretical upper limit. This measurement reveals some insight into the influence of approximating material properties on the antenna performance measure.
Place, publisher, year, edition, pages
2013. , 78 p.
EES Examensarbete / Master Thesis
limitations, array antenna
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-144898OAI: oai:DiVA.org:kth-144898DiVA: diva2:715229
Master of Science - Electrophysics
2013-12-04, TET-library, Teknikringen 33, Stockholm, 14:00 (English)
Jonsson, B. Lars G.
Jonsson, B. Lars G.