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.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:kth-144898 |
| Date | January 2013 |
| Creators | Hussain, Nizamudin |
| Publisher | KTH, Elektroteknisk teori och konstruktion |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | EES Examensarbete / Master Thesis |
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