Broadband and High-Gain Circularly-Polarized Antenna With Low RCS
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Bibliographic record
Abstract
In this paper, a wideband circularly polarized (CP) antenna with a low radar cross section (RCS) and high gain properties is investigated. The proposed antenna is based on a combination of the Fabry-Perot cavity (FPC) and sequential feeding technique. The purpose of this antenna is to produce CP with high directive gain over a wide bandwidth while preserving low RCS. The principle of the FPC and resonance is achieved by applying one frequency selective surface (FSS) metasurface. A microstrip slot array operating at the Ka-band, excited by a sequentially rotated feeding network, is designed and fabricated. It is indicated that all the merits mentioned above can be obtained over a broad frequency band by designing a suitable FSS metasurface and modifying the feeding lengths to adjust desirable phase. RCS reduction is realized by 180° ±37° reflection phase variations between adjacent FSS unit cells on the metasurface. The experimental results show that the gain of the antenna with the metasurface is at least 7 dB greater than that of the primary antenna with a peak value approximately 20 dB at 28.5 GHz. In addition, bandwidths of 3-dB gain, impedance (|S11| ≤ -10 dB), and axial ratio ≤3 dB are ranged from 27.5 to 33.5 GHz (19.7%), 26.7 to 34.2 GHz (24.6%), and 26.8 to 33.1 GHz (21%), respectively. The monostatic RCS reduction for a normal incidence is effectively suppressed from 28 to 48 GHz (52%).
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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 | 0.000 |
| 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 it