Embedded Near-Field Probing Antenna for Enhancing the Performance of 37–41-GHz Linear and Dual-Polarized Phased Antenna Arrays
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Bibliographic record
Abstract
This letter proposes a new wideband near-field (NF) probing antenna embedded in millimeter-phased antenna arrays to produce the feedback signals necessary for carrying-out array calibration and digital pre-distortion (DPD) training. Specifically, the topology and layout of the proposed NF probing antenna are carefully devised to avoid disturbing the antenna array’s radiation pattern while providing a coupling to its surrounding antenna elements with flat magnitude and constant group delay in both vertical and horizontal polarizations. Moreover, the proposed NF probing antenna size is optimized to cope with the constrained spacing between the antenna elements (e.g., <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda b /2$ </tex-math></inline-formula> antenna spacing). Proof-of-concept prototypes of a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2 \times 2$ </tex-math></inline-formula> dual-polarized passive and a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$4 \times 4$ </tex-math></inline-formula> linear-polarized active antenna arrays with embedded NF probing antenna(s) operating over the frequency band of 37–41 GHz were designed. Moreover, a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$4 \times 4$ </tex-math></inline-formula> linear-polarized antenna array without NF probing antennas was also fabricated to serve as a benchmark. The measurement confirmed the negligible impact of the NF probing antennas on the antenna array’s radiation pattern. Furthermore, the embedded NF probing antennas were successfully used to train a DPD function which then enabled the effective isotropic radiated power to be increased from 32 to 34.1 dBm while maintaining an error vector magnitude (EVM) below 3.5%.
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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 | 0.001 |
| 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 it