A 90° Waveguide Hybrid with Low Amplitude Imbalance in Full W-Band

Ding, Jiang‐Qiao; Zhao, Yun; Ge, Jingpeng; Shi, Sheng‐Cai

doi:10.1007/s10762-019-00577-1

Cited by 14 publications

(14 citation statements)

References 16 publications

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“…6 (h). Above tolerance analyses have made clear that the current CNC machining within ±10 μm errors [6][7][8][9][10][11][29][30] can well meet the technological requirements of this 400 GHz waveguide filter design.…”

Section: Tolerance Analysis Of Filter-iimentioning

confidence: 95%

“…Terahertz heterodyne receivers and arrays [3][4] have provided higher sensitivity, greater detecting speed, and large-scale mapping ability in these scientific and practical applications. There is a recently growing interest in passive components for performance improvement of advanced terahertz instruments [1][2][3][4], such as antennas [5], polarimeters [6], orthomode transducers [7], couplers [8][9], twists [10] and filters [11], ect. terahertz filters, as one of the key devices, play an invaluable role in communication systems and spectrum detectors, blocking unwanted, harmonic or mirrored waves.…”

Section: Introductionmentioning

confidence: 99%

“…Comparing with the substrate-based microstrip lines and coplane waveguides [12] with significant losses in high THz band, the metal sealed waveguides can exhibit advantages of low loss (high Q-factor), power handling, easy assembling and interconnection, which are preferred transmission medium to realize components and systems from W-band up to THz band [1][2][3][4][5][6][7][8][9][10][11]. Because of waveguide filters working in THz band suffer from fine dimension drawback, various micro-machining technologies with high precision have been employed for fabrications, such as laser sintering [13], silicon based MEMS [14][15][16][17][18] and thick SU-8 photoresists [19][20], especially for the components working from 300 GHz and beyond.…”

Section: Introductionmentioning

confidence: 99%

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400 GHz Easy-Packaging Waveguide Filters Based on Mixed-Mode and Off-Axis Couplings

2021

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Filters play an invaluable role in most detection and communication systems, blocking unwanted, harmonic or mirrored waves. In this paper, two 3 rd -order quasi-elliptical waveguide bandpass filters working at 400 GHz are developed based on TE102-mode oversized resonators. Transmission zeros are generated through the physical cross-couplings and the mixed modal bypass couplings. H-plane off-axis coupling structures without any fragile irises are adopted to strengthen robustness and simplify manufacturing at such high terahertz frequencies. Effects of processing uncertainties on filters performance are discussed in detail to display error sensitivity. Two computer numerical control (CNC) machined filters exhibit a minimum insertion loss of about 1.5 dB in a 3 dB fractional bandwidth (FBW) with 12% centered at 390 GHz @ Filter-I, and 9% FBW with a center frequency of 394 GHz @ Filter-II, which are all mainly agreement with simulations. The performance is highlighted with the reported terahertz filters, which indicates that both architectural designs are still suited for the delicate CNC-milling restriction in such high WR-2.2 band.INDEX TERMS CNC-milling, easy-packaging, off-axis coupling, oversized cavities, terahertz, waveguide filter, WR-2.2 band.

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Section: Tolerance Analysis Of Filter-iimentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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400 GHz Easy-Packaging Waveguide Filters Based on Mixed-Mode and Off-Axis Couplings

2021

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“…The 90° waveguide hybrid working at the D‐band can be developed based on the conventional multi‐branch constructions . A five‐branch waveguide hybrid coupler is proposed, as shown in Figure A, which has four ports: port 1 (input), port 2 (through), port 3 (coupled), and port 4 (isolated).…”

Section: Power‐combined Doubler Developmentmentioning

confidence: 99%

A 300 GHz power‐combined frequency doubler based on E‐plane 90°‐hybrid and Y‐junction

Ding

Maestrini

Gatilova

et al. 2019

Micro & Optical Tech Letters

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In this article, a 300 GHz power‐combined frequency doubler using two chips in a single waveguide block is developed to acheive high power handling capability. Each doubler chip integrated with six diodes on a 5‐μm‐thick GaAs membrane is manufactured by the LERMA‐C2N Schottky process. In the power combining architecture, the input wave is split into two paths with a 90° relative phase shift by using a 90° hybrid coupler, and the in‐phase E‐field power combining between the output ports is provided by an E‐plane Y‐junction. This doubler can enjoy comparable performance of bandwidth and efficiency as the single‐chip version except with the twice input power handling. Partial results including ~8 mW output power and ~15% efficiency have been delivered in the band of 260‐310 GHz when pumping with 20‐60 mW input power, which indicates that this dual‐chip doubler can work availably. Such E‐plane power‐combined doubler can be further served to drive high‐power terahertz multiplier chains, and also pump multipixel heterodyne detectors.

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“…However, this design with the fourth port terminating in a coaxial line load lends itself difficultly to be realized at the higher submillimeter wave and terahertz frequencies. The classical topological waveguide hybrids [24][25][26] with high isolation are also usually employed as power dividers. However, the intrinsic 90° or 180° phase shift between the two output ports is difficult to compensate in a broad bandwidth.…”

Section: Introductionmentioning

confidence: 99%

H-Plane Waveguide In-Phase Power Divider/Combiner With High Isolation Over the WR-3 Band

2021

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A novel H-plane waveguide in-phase power divider (also known as combiner) with high isolation working across full WR-3 band (220-330 GHz) is realized in this paper. This distinctive architecture is designed based on the sum-difference principle of Magic-T, whose E-plane branch (difference port) is matched with an E-plane T-junction. Both effects of processing and assembling uncertainties on this power divider/combiner performance are discussed in detail to display error sensitivity. The physical prototype is split into three blocks and processed by the state-of-the-art computer numerical control (CNC) milling technology. The absorbing materials are housed in the loaded T-junction arms to terminate return wave as well. Compared with the most reported terahertz waveguide power couplers, the meaningful measured results of this advanced in-phase power divider are delivered. The input and output matching as well as high isolation have been obtained over full WR-3 band, when an 11 dB reference level is considered. A total insertion loss of about 1.2 dB is achieved including three straight waveguides having a total length of 30 mm, which is also in good agreement with simulations. This module, which is fully compatible with the standard CNC-milling technique, can be directly integrated to terahertz detection systems.INDEX TERMS CNC-milling, in-phase power divider/combiner, input/output matching, high isolation, terahertz, waveguide, wideband, WR-3 band.

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A 90° Waveguide Hybrid with Low Amplitude Imbalance in Full W-Band

Cited by 14 publications

References 16 publications

400 GHz Easy-Packaging Waveguide Filters Based on Mixed-Mode and Off-Axis Couplings

400 GHz Easy-Packaging Waveguide Filters Based on Mixed-Mode and Off-Axis Couplings

A 300 GHz power‐combined frequency doubler based on E‐plane 90°‐hybrid and Y‐junction

H-Plane Waveguide In-Phase Power Divider/Combiner With High Isolation Over the WR-3 Band

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