Substrate Integrated Waveguide-Based Full-Duplex Antenna With Improved Out-of-Band Suppression
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Bibliographic record
Abstract
This brief presents a self-diplexing antenna with harmonic-suppression capability. The suggested antenna operates at 7.8 and 9 GHz and maintains a harmonic suppression of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$3.17f_{1}$ </tex-math></inline-formula> (where <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$f_{1}$ </tex-math></inline-formula> is the lower resonant frequency.) The isolation between two ports is more than 22 dB. The substrate-integrated waveguide (SIW) is used in the construction of the cavity-backed planar duplexing antenna. Starting from a microstrip patch antenna with undesirable high-frequency harmonics, a series of vias are used to suppress those harmonics. Finally, a slot (rotated over 45°) is used to bring the higher order mode to lower frequencies. Moreover, the size reduction in this design is achieved using capacitive slots. Consequently, the proposed antenna suppresses the second, third and fourth harmonics by using two pairs of slots and shorting pins. Besides having a low-profile and offering harmonic suppression, it provides independent frequency tuning in the operating frequency bands by means of capacitive slots. The proposed antenna is built and tested, displaying a reasonable match between the simulation and measurement performances, in this way validating the suggested concept.
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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