A systematic optimum design of waveguide-to-microstrip transition

Lee, Hong-Bae; Itoh, T.

doi:10.1109/22.575603

Cited by 50 publications

(6 citation statements)

References 14 publications

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“…Consequently, differentiating through FDFD involves an electromagnetic simulation with (∂f obj /∂E i ) T /(−iω i ) as the source. Similar results exist for other simulation methods [27,41,38].…”

Section: Mathematical Detailssupporting

confidence: 87%

“…The gradient is computed using reverse-mode autodifferentiation, also commonly known as backpropagation, which is an efficient method to compute the gradient of a function with few outputs (in this case one) and many inputs (dimensionality of the parametrization). Backpropagation through the electromagnetic simulation is also often referred to as the adjoint method or adjoint simulation [27]. The special name arises from the fact that the computation involves another electromagnetic simulation with the same permittivity but different source.…”

Section: A5 Executing the Optimization Planmentioning

confidence: 99%

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Nanophotonic inverse design with SPINS: Software architecture and practical considerations

Vercruysse

Skarda

et al. 2020

Applied Physics Reviews

117

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A computational nanophotonic design library for gradient-based optimization called SPINS is presented. Borrowing the concept of computational graphs, SPINS is a design framework that emphasizes flexibility and reproducible results. The mathematical and architectural details to achieve these goals are presented, and practical considerations and heuristics for using inverse design are discussed, including the choice of initial condition and the landscape of local minima. arXiv:1910.04829v2 [physics.app-ph] 31 Oct 2019 design. These include the design of objective functions and the choice of initial condition based on an analysis of the local minima reached by the optimization process.The paper outline is as follows. Section 2 provides a mathematical overview of inverse design, and Section 3 provides an overview of the framework and how the inverse design formulation is implemented. Section 4 presents an example of designing wavelength demultiplexers and discusses salient points in the overall design process. Finally, Section 5 discusses practical considerations and analyzes key properties of gradient-based nanophotonic optimization.

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Section: Mathematical Detailssupporting

confidence: 87%

Section: A5 Executing the Optimization Planmentioning

confidence: 99%

Nanophotonic inverse design with SPINS: Software architecture and practical considerations

Vercruysse

Skarda

et al. 2020

Applied Physics Reviews

117

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“…Simplified sinusoidal current distribution on the probe for the spectral domain is used to calculate the input impedance in Reference [16]. Based on the finite element method, a more rigorous approach 095001-2 is demonstrated in Reference [17]. In this design, using the theory mentioned in References [18,19], the input impedance of the probe can be expressed as below:…”

Section: A Novel Waveguide-to-microstrip Transition Designmentioning

confidence: 99%

A full W-band low noise amplifier module for millimeter-wave applications

et al. 2015

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A full W-band low noise amplifier (LNA) module is designed and fabricated. A broadband transition is introduced in this module. The proposed transition is designed, optimized based on the results from numerical simulations. The results show that 1 dB bandwidth of the transition ranges from 61 to 117 GHz. For the purpose of verification, two transitions in back-to-back connection are measured. The results show that transmission loss is only about 0.9–1.7 dB. This transition is used to interface integrated circuits to waveguide components. The characteristic of the LNA module is measured after assembly. It exhibits a broad bandwidth of 75 to 110 GHz, and has a small signal gain above 21 dB. The noise figure is lower than 5.2 dB throughout the entire W-band (below 3 dB from 89 to 95 GHz) at room temperature. The proposed LNA module exhibits potential for millimeter wave applications due to its high small signal gain, low noise, and low DC power consumption.

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“…In the past years, a number of techniques have been studied on SIW‐to‐waveguide transitions at microwave and millimeter‐wave frequency. There are some planar circuit‐waveguide transitions have been reported in past years by using various techniques. The vertical transfer technique is applied in transition at W‐band (75–110 GHz) by multi‐layer PCB process, which achieved a frequency bandwidth of 20% for S11 less than −14 dB and an insertion loss of 1.7 dB at 91.8 GHz.…”

Section: Introductionmentioning

confidence: 99%

“…The transition working at Ka‐band is realized by using a radial probe extended from an SIW inserted into a height‐tapered waveguide, and the results show that an insertion loss less than 2.5 dB and a return loss better than 14 dB in 28.3‐39.5 GHz. The E/H plane microstrip probe is studied in, and a W‐band E‐plane waveguide‐to‐microstrip probe transition has been designed in with a return loss better than 25 dB. The end inserted magnetic field coupling technique is applied in transition, which shows the insertion loss of the back‐to‐back transition is less than 2.5 dB in the Ka‐band.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the rectangular waveguide to SIW transition for terahertz applications

Hao

Wang

2017

Micro & Optical Tech Letters

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In this paper, the performance of a terahertz rectangular waveguide to substrate integrated waveguide (SIW) transition using fin line coupling structure is investigated. Two prototypes working at 140 GHz and 180 GHz frequency bands are both designed, and fabricated by using the low‐cost printed‐circuit‐board (PCB) technology. Full‐wave simulations have been used to synthesize and optimize the transitions. In order to evaluate effectively the insertion loss of the transition, three different lengths of transitions are designed and measured for D‐band and G‐band, respectively. Measurement results show that from 110 GHz to 150 GHz and from 169 GHz to 193 GHz, the average insertion loss of the terahertz transition is around 0.54 dB and 0.89 dB, respectively. And their measured return losses are both larger than 10 dB. This work demonstrates that the investigated SIW to WR6/WR5 waveguide transitions can be used for developing future planar terahertz components by using the low cost PCB process.

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A systematic optimum design of waveguide-to-microstrip transition

Cited by 50 publications

References 14 publications

Nanophotonic inverse design with SPINS: Software architecture and practical considerations

Nanophotonic inverse design with SPINS: Software architecture and practical considerations

A full W-band low noise amplifier module for millimeter-wave applications

Investigations on the rectangular waveguide to SIW transition for terahertz applications

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