Generalized Coupled-Line All-Pass Phasers

Gupta, Shulabh; Zou, Lianfeng; Jiang, Li Jun; Caloz, Christophe

doi:10.1109/tmtt.2015.2397445

Cited by 38 publications

(34 citation statements)

References 42 publications

(33 reference statements)

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“…A hybrid configuration based on the combination of a CCS and a CCL configuration, known as hybrid cascade (HC) coupled-line phaser was recently proposed in Ref. [34]. This set of three cascading configurations, CCL, CCS, and HC, represent the fundamental cascading schemes upon which more complex phasers can be constructed, leading to vast variety of coupled-line all-pass phasers with rich and exotic dispersion characteristics.…”

Section: Electromagnetic Phasersmentioning

confidence: 99%

“…The derivation of a generalized transfer function corresponding to a coupled-line coupler terminated with an arbitrary all-pass load with transfer function S0 is provided in reference [34], and reads…”

Section: Basic Transfer Functionsmentioning

confidence: 99%

“…In this configuration, several coupled-line sections are cascaded in the direction of the transmission lines forming the coupled-lines, as shown in Figure 3(a), with the last section being a C-section Cristal [31]. The corresponding transfer function can be derived by iteratively constructing the load transfer functions starting from the last coupled-line section toward the input port, as derived by Gupta et al [34]. The result is…”

Section: Phaser Topologiesmentioning

confidence: 99%

“…A conventional phaser, shown in Figure 6(a), is typically a series connection of C or D sections used in the hybrid configuration of Figure 3 [34]. For example, a microwave C-section is a dispersive basic building block, where cascading C-sections of different frequency and delay characteristics, provides a specified group delay response.…”

Section: Wave Propagation Concepts For Near-future Telecommunication mentioning

confidence: 99%

See 3 more Smart Citations

Real-Time Electromagnetic Signal Processing: Principles and Illustrations

Gupta¹,

Caloz²

2017

Wave Propagation Concepts for Near-Future Telecommunication Systems

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Real-time electromagnetic signal processing has recently appeared as a novel signalprocessing paradigm to manipulate and control electromagnetic signals in real time directly in the analog domain. This has led to attractive alternatives to conventional digital techniques, which typically suffer from poor performances and high cost at microwave and millimeter wave frequencies. This novel paradigm is based on dispersion-engineered electromagnetic structures, and in this review chapter, two types of structures are presented and discussed in details: phasers and metasurfaces. While phasers are typically group delay engineered to manipulate and rearrange spectral components in the time domain, metasurfaces enhances these functionalities by providing spatial processing in addition to temporal processing. Two kinds of phasers are presented here: static and dynamic all-pass C-section phasers, and all-dielectric metasurface-based spatial phasers. Finally, two applications illustrating real-time signal processing are discussed: 2D beam scanning leaky-wave antenna for high-resolution spectrum analysis and a dispersion code multiple access (DCMA) system.

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Section: Electromagnetic Phasersmentioning

confidence: 99%

Section: Basic Transfer Functionsmentioning

confidence: 99%

Section: Phaser Topologiesmentioning

confidence: 99%

Section: Wave Propagation Concepts For Near-future Telecommunication mentioning

confidence: 99%

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Real-Time Electromagnetic Signal Processing: Principles and Illustrations

Gupta¹,

Caloz²

2017

Wave Propagation Concepts for Near-Future Telecommunication Systems

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“…The key component of a R-ASP system is the phaser [1], [2] 1 , a device providing specified group delay versus frequency response depending on the application, e.g. linear for real-time Fourier transformers [3], staircase for spectrum sniffers [4] and Chebyshev for dispersion code multiple access (DCMA) [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Bandwidth and Diversity in Real-Time Analog Signal Processing (R-ASP) Using Nonuniform C-Section Phasers

Taravati

Gupta

Caloz

2016

IEEE Microw. Wireless Compon. Lett.

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Abstract-We show that a continuously nonuniform coupledline C-section phaser, as the limiting case of the stepdiscontinuous coupled-line multisection commensurate and noncommensurate phasers, provides enhanced bandwidth and diversity in real-time analog signal processing (R-ASP). The phenomenology of the component is explained in comparison with the step-discontinuous using multiple-reflection theory and a simple synthesis procedure is provided. The bandwidth enhancement results from the suppression of spurious group delay harmonics or quasi-harmonics, while the diversity enhancement results from the greater level of freedom provided by the continuous nature of the nonuniform profile of the phaser. These statements are supported by theoretical and experimental results.

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Tailoring Group Delay Dispersion of Spatial Phaser using Anisotropic Metasurface and Polarized Incident Waves

Jiang

Liu

et al. 2023

Advanced Optical Materials

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Metasurface-based spatial phaser, exhibiting dispersive group delay responses, is able to perform real-time analogue signal processing on the temporal spectrum of spatial electromagnetic waves, e.g., Fourier transformation, pulse chirping, pulse spread, and compression. The functionality of a spatial phaser is closely related to its group delay dispersion slope. For instance, for an up-chirped incident pulse, the positive-slope-dispersion phaser spreads the pulse whereas the negative-slope-dispersion one compresses the pulse. Most reported spatial phasers exhibit fixed dispersion slopes and hence perform single functionality only, which cannot meet the demand of multifunctional systems in communication and sensing applications. In this paper, a new way is proposed to control and tune the dispersion slope of spatial phasers using polarization of incident waves, which is simpler and more efficient than conventional approaches based on tunable circuits. To verify the proposed method, a first-order spatial phaser is designed and experimentally demonstrated within 9.4-10.6 GHz. It is able to generate negative-slope, positive-slope, and zero-slope group delay dispersions, in case of x-, y-, and ±45°-polarized waves. Such a reconfigurable phaser may find wide applications in integrated communication and sensing.

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Generalized Coupled-Line All-Pass Phasers

Cited by 38 publications

References 42 publications

Real-Time Electromagnetic Signal Processing: Principles and Illustrations

Real-Time Electromagnetic Signal Processing: Principles and Illustrations

Enhanced Bandwidth and Diversity in Real-Time Analog Signal Processing (R-ASP) Using Nonuniform C-Section Phasers

Tailoring Group Delay Dispersion of Spatial Phaser using Anisotropic Metasurface and Polarized Incident Waves

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