A Wideband GAAS 6-Bit True-Time Delay MMIC Employing On-Chip Digital Drivers

Willms, John; Ouacha, A.; Boer, Lex de; Vliet, F.E. van

doi:10.1109/euma.2000.338753

Cited by 34 publications

(27 citation statements)

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“…To do this, we must define the value around which to seek the solution of the system that will be calculated only at the center frequency f. On a mathematical simulator, using a numerical solver, define the values of Z c , Z 0 , and f, the ABCD parameters of the switches in the delay or reference state, and then insert (13), (15), (36), (37), (20), the (32), or (33) depending on the position of S 11 in condition of the direct connection, and insert the inequality (31). At this point, insert the value around which to seek the electrical length of the reference line, for example u 1 ¼ 1 to obtain a short line, and solve numerically to find it.…”

Section: ) Condition Of Null Differential Phase Shiftmentioning

confidence: 99%

“…On a mathematical simulator, using an analytical solver, define the values of Z 0 , Z c , the values of the ABCD parameters of the switches in the delay and reference state, the value of L 1 previously calculated at the central frequency f; insert the parameterized design formulas, as for example from (45) to (54), and then insert the equations from (9) to (16) and the formulas from (17) to (20) both in reference and in delay state and insert (24), all these ones parameterized as vector functions of the frequency and of the parameter of proportionality that sweeping. At this point, solve analytically to find the matrices of RL ref , RL delay , and Df.…”

Section: True-time-delay Network Design Technique2 ) Technical Investmentioning

confidence: 99%

“…On a mathematical simulator, using a numerical solver, define the values of Z 0 , Z c , the values of the ABCD parameters of the switches in the delay and reference state, the value of u 1 and f ref previously calculated, the value of the desired Dt, the central frequency f, the values of the three fine proportionality parameters around which to seek the solution, evaluated during the technical investigation; then insert the formulas from (6) to (8), and from (9) to (20) in reference and in delay state; insert (30), (24), and (31).…”

Section: ) Calculation Of the Electrical Lengths Of The Delay Pathmentioning

confidence: 99%

“…The 6-bit device presented in [20] operates from 2 to 20 GHz, providing a delay from 2.5 to 145 ps. Even if the total area is 4.0 × 1.4 mm 2 , the maximum IL is 25 dB and RL is not reported.…”

Section: V a P P L I C A T I O N : A M O N O L I T H I C G A A S mentioning

confidence: 99%

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A true-time-delay networks design technique

Leggieri

Passi

Paolo

2014

Int. J. Microw. Wireless Technol.

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A true-time-delay networks design technique alberto leggieri, davide passi and franco di paolo This paper proposes a technique to design wide band switched-line (SL) true-time-delay (TTD) networks, commonly used for phased array antenna (PAA) applications. This study investigates the constant-delay behavior of switched-line phase shifters based on single-pole double-throw (SPDT) switches. Circuit sizing starts by considering the effective S-parameters of the switches, to use their non-idealities as an integral part of the phase shift linearly dependent to the frequency and by considering, from the beginning, the possible spatial positioning of elements that allows the circuit feasibility as a design target. The aim of this study is to provide a technique suitable for the design of well-matched TTD networks with a flat delay in wide bandwidth. In this paper, we propose new design formulas for which we show a single-frequency implementation. A computational strategy is used to obtain numerical solutions of the derived equations with this study. Finally, a monolithic X-band TTD circuit example is shown.

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Section: ) Condition Of Null Differential Phase Shiftmentioning

confidence: 99%

Section: True-time-delay Network Design Technique2 ) Technical Investmentioning

confidence: 99%

Section: ) Calculation Of the Electrical Lengths Of The Delay Pathmentioning

confidence: 99%

Section: V a P P L I C A T I O N : A M O N O L I T H I C G A A S mentioning

confidence: 99%

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A true-time-delay networks design technique

Leggieri

Passi

Paolo

2014

Int. J. Microw. Wireless Technol.

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“…A true-time-delay line (TTDL) is adopted in various microwave applications such as phased-array systems, synthetic aperture radars, delay-lock loops, and feedforward amplifiers [1,2,3]. TTDLs are required to transfer the microwave signals with constant and large group delay over a wideband frequency range in a compact area.…”

Section: Introductionmentioning

confidence: 99%

A stepped-impedance true time delay line using GaAs MMIC technology

Kim

2016

IEICE Electron. Express

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A new true time delay line (TTDL) using a stepped impedance (SI) structure is proposed for compact and wideband TTDLs in GaAs MMICs. An equivalent circuit model and a dispersion equation for the proposed SI-TTDL are also presented. Experimental verification and comparison with a conventional design are provided. The group delay of the proposed SI-TTDL is substantially increased up to approximately twice of a conventional microstrip transmission line in GaAs MMICs. Keywords: MMIC, slow-wave, stepped impedance, true time delay Classification: Microwave and millimeter-wave devices, circuits, and modules References

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Antenna Applications of Negative Refractive Index Transmission‐Line (NRI‐TL) Metamaterials

Eleftheriades¹,

Antoniades²

2007

Modern Antenna Handbook

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In the 1960s Victor Veselago systematically examined hypothetical materials having simultaneously negative permittivity and negative permeability [1]. He described a number of unusual electromagnetic phenomena associated with such media. A characteristic property of these materials is that plane waves propagating in them would have their phase velocity antiparallel to the group velocity; hence these media would support backward waves. Likewise, the vectors describing the electric field, the magnetic field, and the propagation direction would follow the left-handed rule. For this latter reason, Veselago coined the term "left-handed" to describe these hypothetical media. Moreover, he associated this kind of "left-handedness" with the notion of negative refraction and he described several unusual focusing devices (e.g., lenses) based on negative refraction. Nevertheless, it should be pointed out that the notion of negative refraction at the interface between a normal dielectric and a dielectric supporting backward waves had been described as early as the beginning of the 20th century [2,3]. It was only recently though that people devised methods of implementing these left-handed or negative refractive index (NRI) media. The first such implementation was produced at the University of California in San Diego and comprised a volumetric periodic array of straight metallic wires and split-ring resonators to synthesize negative effective permittivity and negative effective permeability, respectively, at microwave frequencies [4,5].Another way to implement artificial materials (metamaterials) that support the phenomenon of negative refraction was subsequently proposed based on the concept of loading planar transmission-line grids with reactive elements (see subsequent sections). This transmission-line (TL) approach does not rely on loosely coupled resonators to synthesize the negative permeability; rather, it depends on the electrical connections between the constituent NRI-TL unit cells to create tightly coupled resonators, thus leading to large bandwidths over which the refractive index remains negative. The explicit formulation of Modern Antenna Handbook. Edited by Constantine A. Balanis

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A Wideband GAAS 6-Bit True-Time Delay MMIC Employing On-Chip Digital Drivers

Cited by 34 publications

References 1 publication

A true-time-delay networks design technique

A true-time-delay networks design technique

A stepped-impedance true time delay line using GaAs MMIC technology

Antenna Applications of Negative Refractive Index Transmission‐Line (NRI‐TL) Metamaterials

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