A Coupler With Wide Power Division Ratio Tuning Range and Flexible Coupling Direction

Chu, Huy Nam; Ma, Tzyh‐Ghuang

doi:10.1109/lmwc.2020.3047217

Cited by 13 publications

(10 citation statements)

References 8 publications

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“…Over a bandwidth from 2.1-2.7 GHz, the insertion loss is read as 1 dB with a good matching (|S 11 |  17 dB) and isolation (|S 41 |  14 dB); the variation of PDR and phase error are  1.5 dB and 11°, respectively. Such a wide bandwidth cannot be feasible by previous techniques [25]- [26] while the design in [27] is a high-cost and high-loss solution.…”

Section: B Reconfigurable Couplermentioning

confidence: 98%

“…Without using an active tunable amplifier or attenuator as in [22], it is capable of splitting the input signal a 1 into s 1 and s 2 with a very wide PDR tuning range and switchable phase difference (s 1 s 2 = 0 o or 180 o ). Also, to overcome the narrowband limitation in [25] and [26], the new topology in Fig. 3 adopts a wideband PS to be detailed in the following subsection.…”

Section: Design and Implementation Of The Tpdmentioning

confidence: 99%

“…It is made up of a cascade connection of a left-handed (LH) and a right-handed (RH) phase reconfigurable synthesized transmission lines (PRSTLs) [21]. In [25] and [26], the original PRSTL was designed as a tunable PS between two bounded states ( 11 cos 1 cos 1…”

Section: A Wideband Varactor-based Psmentioning

confidence: 99%

“…4(b). A flattened response over the band is observed, therefore significantly widening the error tolerance bandwidth () and hence operating bandwidth when compared with conventional loaded-line PSs using LH and/or RH structures [25]- [26], [28]- [29].…”

Section: A Wideband Varactor-based Psmentioning

confidence: 99%

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A Phase Distribution Network Using 2 × 4 Butler Matrix for Linear/Planar Beam-Scanning Arrays

Chu

2021

IEEE Access

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A new 1  4 phase distribution network (PDN) featuring a fully controllable progressive phase shift between outputs is proposed for continuous beam-scanning arrays. The PDN is made up of two parts: a modified 2  4 Butler matrix integrated with four phase shifters (PSs), and a tunable power divider (TPD) whose power division ratio can be controlled over a wide tuning range. The synthesis equations show that the relative phase shift between PDN outputs can be fully controlled by the TPD and embedded PSs without using an external single-pole quad-throw (SP4T) switch. The proposed PDN is demonstrated at 2.4 GHz as the feed network of a 4-element linear array. The experimental results display a fully controllable progressive phase shift (from −180° to 180°) between PDN outputs over a 20% bandwidth with good performance of matching, power division, and relative phase shifts. A spatial coverage of 116° with the feature of continuous beam scanning and negligible dc power consumption is achieved. Benefitting from the single-input topology, a planar 16-element phased array for 2D beam scanning is then realized by simply stacking and cascading five instead of eight PDN modules. It removes the high-cost and bulky SP16T switch. Experimental results demonstrate the uniqueness of the proposed designs.INDEX TERMS Antenna arrays, beam-steering, Butler matrix, phase shifters, tunable circuit and devices.

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Section: B Reconfigurable Couplermentioning

confidence: 98%

Section: Design and Implementation Of The Tpdmentioning

confidence: 99%

Section: A Wideband Varactor-based Psmentioning

confidence: 99%

Section: A Wideband Varactor-based Psmentioning

confidence: 99%

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A Phase Distribution Network Using 2 × 4 Butler Matrix for Linear/Planar Beam-Scanning Arrays

Chu

2021

IEEE Access

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“…However, some applications require the possibility to either reroute the signal towards a different port or change the coupling level of the coupled port. Various approaches have been reported for low-frequency (less than 5GHz) couplers with tunable power division ratio [23][24][25] and some other also include direction switching capability 26,27 . In this paper, we present a compact solution for a switchable directional coupler whose design is based on PTD symmetry theory.…”

mentioning

confidence: 99%

Switchable edge-line coupler based on parity time-reversal duality symmetry

Nadeem

Verri²,

Martini

et al. 2022

Sci Rep

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A compact broadband Edge-Line Coupler (ELC) based on Parity Time-reversal Duality (PTD) symmetry has been conceived, designed, constructed and measured. The coupler connects four PTD bifilar edge lines (BELs), recently introduced by the authors. The PTD-BELs are constituted by a parallel plate waveguide whose walls are formed by a junction between Perfect Electric Conductor (PEC) and Perfect Magnetic Conductor (PMC) boundary conditions. Reversing the axis orthogonal to the plates interchanges the position of PEC and PMC. Such a waveguide supports unimodal transverse electromagnetic (TEM) propagation, extremely confined along the top and bottom junction edges; its propagation is protected against backscattering from any discontinuity that preserves the PTD symmetry. The ELC presented here is constituted by a 4-port junction in which each port is intrinsically matched due to the PTD symmetry, strongly coupled with a second port, strongly decoupled with a third port, and weakly coupled with a fourth port. The ELC is designed by using a mushroom metasurface for the PMC portion of the device; the connection is based on a switch circuit which imposes open and short conditions on the two opposite sides of the structure. Switching simultaneously the open and short circuits reroutes the signal in a different port, while maintaining the same level of coupling with the other ports. A static prototype has been built and its measurements have confirmed the matching performance and the good directionality of the coupler in a broadband frequency range between 24 and 30 GHz.

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Tunable Couplers: An Overview of Recently Developed Couplers With Tunable Functions

Tan

Zhang

2023

IEEE Microwave

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A Coupler With Wide Power Division Ratio Tuning Range and Flexible Coupling Direction

Cited by 13 publications

References 8 publications

A Phase Distribution Network Using 2 × 4 Butler Matrix for Linear/Planar Beam-Scanning Arrays

A Phase Distribution Network Using 2 × 4 Butler Matrix for Linear/Planar Beam-Scanning Arrays

Switchable edge-line coupler based on parity time-reversal duality symmetry

Tunable Couplers: An Overview of Recently Developed Couplers With Tunable Functions

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