A Novel All-Pass Network Implementation for Improved Group Delay Performance

Keerthan, P.; Kumar, Ritesh; Vinoy, K. J.

doi:10.1109/lmwc.2016.2605439

Cited by 15 publications

(3 citation statements)

References 9 publications

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“…[5,6] In recent years, significant efforts have been made to synthesize arbitrary group delay responses for phasers. [7][8][9][10][11][12] Reported implementations include cascaded coupled lines, [13,14] quarter-wavelength transmission line resonators, [15] c-section couplers, [16] deformed open stubs, [17] and stepped impedance lines, [18,19] etc. All of these implementations are guided-wave devices, which cannot directly process spatial electromagnetic waves.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Recently, artificial neural networks (ANNs) were successfully used for modeling microwave devices [19][20][21][22]. ANNs have been used in both synthesis and analysis [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Predicting the Frequency Characteristics of Hybrid Meander Systems Using a Feed-Forward Backpropagation Network

et al. 2019

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The process of designing microwave devices is difficult and time-consuming because the analytical and numerical methods used in the design process are complex. Therefore, it is necessary to search for new methods that will allow for an acceleration of synthesis and analytic procedures. This is especially important in cases where the procedures of synthesis and analysis have to be repeated many times, until the correct device configuration is found. Artificial neural networks are one of the possible alternatives for the acceleration of the design process. In this paper we present a procedure for analyzing a hybrid meander system (HMS) using the feed-forward backpropagation network (FFBN). We compared the prediction results of the transmission factor and the reflection factor , obtained using the FFBN, with results obtained using traditional analytical and numerical methods, as well as with experimental results. The comparisons show that prediction results significantly depend on the FFBN structure. In terms of the lowest difference between the characteristics calculated using the method of moments (MoM) and characteristics predicted using the FFBN, the best prediction was achieved using the FFBN with three hidden layers, which included 18 neurons in the first hidden layer, 14 neurons in the second hidden layer, and 2 neurons in the third hidden layer. Differences between the predicted and calculated results did not exceed 7% for the parameter and 5% for the parameter. The prediction of parameters using the FFBN allowed the analysis procedure to be sped up from hours to minutes. The experimental results correlated with the predicted characteristics.

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“…A dispersive delay line (DDL) can provide frequency dependent group delay. It is widely used in many areas, such as group delay equalization, novel phase array elements, compressive receiver, and analog signal processing [1][2][3][4][5][6][7][8][9]. At present, a key research challenge for DDL is to achieve high delay from a compact structure with an acceptable insertion loss (IL).…”

Section: Introductionmentioning

confidence: 99%

A Compact Dispersive Delay Line Using Microstrip Lines and Opened Slot Lines

Li¹,

Yuan²,

Wu³

et al. 2019

PIER Letters

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A dispersive delay line (DDL) with compact size, good group delay, and all pass response in 200-800 MHz band is presented. The proposed DDL is composed of a main microstrip transmission line with two shunted open stubs and two complementary slot lines, and a coupling slot line in ground plane. The length of the complementary slot line is reduced approximately from λ g /2 to λ g /4 through the upper end being opened, hence achieves miniaturization for the proposed DDL (λ g is the guided wavelength at the center frequency). The overall area is 0.196 × 0.093λ 2 g with a peak group delay time of 3.2 ns. The proposed DDL has the advantages of compactness, good capability, and easy fabrication without any external matching network.

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A Novel All-Pass Network Implementation for Improved Group Delay Performance

Cited by 15 publications

References 9 publications

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

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

Predicting the Frequency Characteristics of Hybrid Meander Systems Using a Feed-Forward Backpropagation Network

A Compact Dispersive Delay Line Using Microstrip Lines and Opened Slot Lines

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