Analysis and design of the periodic structure based low-profile planar high-gain antennas
Bibliographic record
Abstract
Recently, some classes of periodic structures have been revisited in the electromagnetic area.A lot of attention is being paid to periodic structures, whose electromagnetic characteristics a,re not found in natural materials.They are called metamaterials.Among these periodic structures are artificial'm,aqneti,c conductors (AMCs) Ntlagnetic condnctors do not exist in nature.I-Iowever, using periodic structures they can be synthesized to some extent.In particular, using periodic patches or metallic gratings on a grounded dielectric slab, one can artificially produce synthesized surfaces.Their svnthesis and application are investigaed in this thesis.The transverse equivalent netrvork (TEN) model will be extended to analyze cavity resonance antennas with artificial ground pianes in this thesis.Emploving this CAD-tool, a comprehensive study is done on the far-field properties of cavity resonance antennas witr artificial ground planes.Using altificiai surfces as the ground plane of this cla.ss of antennas.it is shown that a compact-size high-directivity antenna can be designecl.Basica,ll-v.one of the main achievements of this thesis is that the antenna dir-ectivity is ob- tained as high as the conventional cavity resonance antenna having an electric conductor ground plane.rvhile the heighi of the antenna is reduced to alnost half.Different artificial gror"rnd planes and superstrate configurations are used to design a number of high-gain low-profile as well as righ-gain clual-bancl dual orthogonally-polarized antennas.Effects of the polarization and angular dependency of the reflection characteristics of tre artificial ground planes on the antenna performance are demonstrated and investigated through numer- ous rigorous exanples.The main contribution of this thesis is demonstration of the beneficial impact of the angular and polarization depencence of the artificial ground planes.It is shown thai ihe fact that a,n antenna over an arti- ficial ground plane exhibits higher directivity Lhan the cases over conventional ground planes is mainly due to the angular and polarization dependence of the ground planes.Shafai.fbr his financial support.lif'e lessons.and the freedom he granted me in mv lesealcr.I am grateful to him for his patience during
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".