Novel compact dual-narrow/wideband branch-line couplers using T-Shaped stepped-impedance-stub lines
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Bibliographic record
Abstract
This article presents a compact model to reduce the physical size and increase the frequency ratio between the second and first resonance frequencies of a dual-function stepped-impedance-stub (SIS) line, which was subsequently employed in the realization of dual-band branch-line couplers. The proposed model comprises of a loaded spiral T-shaped SIS that reduces the size of a conventional SIS line as well as improving its frequency ratio. The proposed model behaves exactly similar to the recently developed dual-band resonators with the advantage of size reduction of ∼35% as well as having a wide range of realizable frequency ratios between 1.4 and 3.7 compared to 1.7–2.7 and 1.8–2.3 for the conventional SIS and T-shaped transmission-lines, respectively. Dual-narrowband and wideband branch-line couplers were developed based on the spiral T-shaped SIS lines. The dual-wideband device's bandwidth was enhanced by 2.7% accompanied by a size reduction of 58.6% in comparison with the conventional dual-wideband couplers operating at the same frequencies. The theoretical results were verified by measurement. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 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 |
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