Beamwidth Switchable Planar Microstrip Series-Fed Slot Array Using Reconfigurable Synthesized Transmission Lines

Chu, Huy Nam; Ma, Tzyh‐Ghuang

doi:10.1109/tap.2017.2700235

Cited by 17 publications

(7 citation statements)

References 17 publications

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“…The Smith chart is extensively employed in the design/measurement stage of a large variety of circuits, from metasurfaces 2 to coils 3 (Supplementary Fig. 3 in 3 ) or scanning microwave microscopy 4 , while being mostly present in microwave-terahertz frequency region in the design and characterization of antennas 5 , transmission lines 6,7 , power amplifiers 8 , filters 9 or acoustic resonators 10 . The 3D Smith chart proposed in 11 generalizes the Smith chart (which is limited within the unit circle to circuits with reflection coefficients magnitudes smaller than unity Fig.…”

Section: Introductionmentioning

confidence: 99%

“…An essential drawback of the Smith chart and previous 3D Smith chart representations 1–14 is the lack of visualization of the variable parameter (frequency), thus the orientation changes and dynamics of the scattering parameters (S) frequency dependency being impossible to be pictured. Although many circuits exhibit a clockwise orientation of their driving point impedances and reflection parameters curves as frequency increases 2–5,9 , (– unspecified) 6,10 , the absence of a clockwise motion (i.e. discontinuity points or counter-clockwise motion) was often reported leading to diverse interpretations.…”

Section: Introductionmentioning

confidence: 99%

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3D Smith charts scattering parameters frequency-dependent orientation analysis and complex-scalar multi-parameter characterization applied to Peano reconfigurable vanadium dioxide inductors

Müller

Moldoveanu

Asavei

et al. 2019

Sci Rep

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Recently, the field of Metal-Insulator-Transition (MIT) materials has emerged as an unconventional solution for novel energy efficient electronic functions, such as steep slope subthermionic switches, neuromorphic hardware, reconfigurable radiofrequency functions, new types of sensors, terahertz and optoelectronic devices. Employing radiofrequency (RF) electronic circuits with a MIT material like vanadium Dioxide, VO2, requires appropriate characterization tools and fabrication processes. In this work, we develop and use 3D Smith charts for devices and circuits having complex frequency dependences, like the ones resulting using MIT materials. The novel foundation of a 3D Smith chart involves here the geometrical fundamental notions of oriented curvature and variable homothety in order to clarify first theoretical inconsistencies in Foster and Non Foster circuits, where the driving point impedances exhibit mixed clockwise and counter-clockwise frequency dependent (oriented) paths on the Smith chart as frequency increases. We show here the unique visualization capability of a 3D Smith chart, which allows to quantify orientation over variable frequency. The new 3D Smith chart is applied as a joint complex-scalar 3D multi-parameter modelling and characterization environment for reconfigurable RF design exploiting Metal-Insulator-Transition (MIT) materials. We report fabricated inductors with record quality factors using VO2 phase transition to program multiple tuning states, operating in the range 4 GHz to 10 GHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3D Smith charts scattering parameters frequency-dependent orientation analysis and complex-scalar multi-parameter characterization applied to Peano reconfigurable vanadium dioxide inductors

Müller

Moldoveanu

Asavei

et al. 2019

Sci Rep

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show abstract

“…Its reconfiguration strategy was moving two flaps mechanically, which has the drawbacks of low accuracy and narrow bandwidth. As for the arrays with switchable feeding networks proposed in [10] and [13], the associated HPBWs could only be switched between three and two states respectively. Thus this might impede their extensive application in the complex and dynamic communication scenarios.…”

Section: Simulated and Measured Resultsmentioning

confidence: 99%

“…This would lead to some inevitable problems such as a lot of motion waste and a low alignment precision. As an option, to electronically control the beamwidth, the method of designing an antenna array configured with a switchable feeding network was adopted [10]. In this way, the number of the operative elements was selective, so the radiation direction and the beamwidth could change accordingly.…”

Section: Introductionmentioning

confidence: 99%

Differentially-Fed Aperture-Coupled Magneto-Electric Dipole Antenna With Continuously Variable Beamwidth

Wang

et al. 2020

IEEE Open J. Antennas Propag.

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A beamwidth reconfigurable linear array antenna utilizing three magneto-electric (ME) dipole antenna elements with no need for a complex feeding network is presented. In this design, the ME dipole antenna elements are differentially excited by three parallel transverse resonant slots etched on the broad wall of a substrate integrated waveguide (SIW) cavity. By symmetrically embedding four copper posts that are connected to varactor diodes between the adjacent slots, the electric field perturbation in the SIW cavity can be realized by manipulation of the varactors. In other words, altering bias voltage of all the varactors simultaneously could offer granular control over the excitation amplitude and phase of the antenna elements. Consequently, continuously variable beamwidth of the antenna can be obtained under electronic control. A fully operational prototype was designed, fabricated, and tested to validate the proposed design. Measured results indicate that the overlapped −10 dB impedance bandwidth of the proposed antenna is 19.6% and the half-power beamwidth (HPBW) in the E-plane is capable of varying from 39 • to 107 • within the operating frequency band. INDEX TERMS Beamwidth reconfigurable antenna, magneto-electric (ME) dipole, substrate integrated waveguide (SIW), varactor diode. YUAN JI (Graduate Student Member, IEEE) was born in Jiangsu, China. She received the B.S. degree in information engineering from Southeast University, Nanjing, China, in 2009, and the M.S. degree in telecommunication engineering from the University of Melbourne, Melbourne, VIC, Australia, in 2011. She is currently pursuing the Ph.D. degree in electronic science and technology with the

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“…When array elements are placed by λ g , the rapid variation of phase with frequency may lead to the waggle of beam pointing 11 . Some works, such as in References 12‐17, used meander lines to reduce the space distance (not inter‐element distance) but introduced significant cross‐polarization, as experimentally demonstrated in Reference 18. Some works 19,20 with 0.5 λ g inter‐element distance was proposed, utilizing metamaterial structure to compensate for the phase difference between each element.…”

Section: Introductionmentioning

confidence: 99%

A new feeding topology with internal 180° phase reversal for wideband series‐fed slot array antennas

Zhang

Feng

2020

Micro & Optical Tech Letters

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This paper proposes a new feeding topology with internal 180 phase reversal for wideband series-fed slot array antennas. As a demonstration, a serial fed, half-wavelength separated, 7-element array is designed at 5.8 GHz. Comparing with conventional series-fed arrays, which require onewavelength separation, the phase difference between adjacent elements varies less with frequency. Thus, the proposed array has more stable beam pointing and wider 1 dB gain bandwidth. A prototype was fabricated and measured to validate the performance of the feeding topology. A wide operating bandwidth of 22.4% for S11 < −10 dB, a 1 dB gain bandwidth of 14% and bi-directional peak gain of 10.01 dBi are achieved with the array length of 2.7λ 0 . The proposed feeding topology shows its potentials in realizing signal coverage on some special occasions, such as coal mines and tunnels.

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Beamwidth Switchable Planar Microstrip Series-Fed Slot Array Using Reconfigurable Synthesized Transmission Lines

Cited by 17 publications

References 17 publications

3D Smith charts scattering parameters frequency-dependent orientation analysis and complex-scalar multi-parameter characterization applied to Peano reconfigurable vanadium dioxide inductors

3D Smith charts scattering parameters frequency-dependent orientation analysis and complex-scalar multi-parameter characterization applied to Peano reconfigurable vanadium dioxide inductors

Differentially-Fed Aperture-Coupled Magneto-Electric Dipole Antenna With Continuously Variable Beamwidth

A new feeding topology with internal 180° phase reversal for wideband series‐fed slot array antennas

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