Broadband Performance of Novel Closely Spaced Elements in Designing Ka-Band Circularly Polarized Reflectarray Antennas
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Bibliographic record
Abstract
Circularly polarized Ka-band reflectarray (RA) antennas are designed and fabricated using novel broadband closely spaced elements. We present the broadband element study for the Ka-band. Three different circularly polarized RA antennas are developed and fabricated from a single dielectric substrate using three distinct elements, which are optimized. All antennas are made of 625 elements that occupy 6.25 × 6.25λ <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> at 30 GHz. A circularly polarized Ka-band conical horn antenna is used to excite the RA. The measured results exhibit good agreement with the simulations. Each of the proposed antennas provides an overall 30% bandwidth that represents the measured bandwidth of -10-dB reflection coefficients, 1-dB gain variation, and the 3-dB axial ratio. The estimated maximum aperture efficiency is 55% at 30 GHz. Two larger RAs of size 25.25 × 25.25 λ <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> (10 201 elements) are designed with focalto-diameter (F/D) ratio 0.59 and 2.74, respectively, to show that the path loss is the main reason affecting the gain bandwidth.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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