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   Articles with "varactor" as a keyword



Efficient Modeling and Simulation of Varactor Diodes Based on Leapfrog Complying Divergence Implicit (LCDI)‐Finite‐Difference Time‐Domain (FDTD) Method

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recommendations! Published in 2025 at "Microwave and Optical Technology Letters"

DOI: 10.1002/mop.70455

Abstract: This letter presents an efficient modeling and fast simulation method for varactor diodes. By analyzing varactor diodes' circuit characteristics, the equivalent current density of varactor diodes is extracted to obtain an efficient Yee modeling. This… read more here.

Keywords: efficient modeling; varactor diodes; leapfrog complying; fdtd method ... See more keywords
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GaN 2DEG Varactor-Based Impulse Suppression Module for Protection Against Malicious Electromagnetic Interference

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recommendations! Published in 2020 at "Journal of Electronic Materials"

DOI: 10.1007/s11664-020-08110-0

Abstract: A GaN-based metal–semiconductor–metal varactor with a two-dimensional electron gas (2DEG) layer is proposed and fabricated. The capacitance variation of this fabricated varactor biased at different external voltages is studied and measured, and the frequency-dependent capacitance… read more here.

Keywords: module; malicious electromagnetic; electromagnetic interference; varactor ... See more keywords

Bandwidth-enhanced differential VCO and varactor-coupled quadrature VCO for mmWave applications

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recommendations! Published in 2018 at "AEU - International Journal of Electronics and Communications"

DOI: 10.1016/j.aeue.2018.08.005

Abstract: Abstract This paper presents a bandwidth-enhanced differential LC-Voltage Controlled Oscillator (LC-VCO) and varactor-coupled Quadrature VCO (QVCO) designed and simulated in high-performance SiGe HBTs of the GlobalFoundries (GFs) 130 nm SiGe BiCMOS8HP process for mmWave applications. Using… read more here.

Keywords: enhanced differential; bandwidth enhanced; vco varactor; quadrature ... See more keywords
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Device modeling of RF varactor diodes for adjustable microwave reflectivity in active frequency selective surfaces

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recommendations! Published in 2021 at "Journal of Physics D: Applied Physics"

DOI: 10.1088/1361-6463/ac0706

Abstract: At present, the design of absorbers with broadband electromagnetic absorption performance in the P/L band (0.3 ∼ 2 GHz) is a huge challenge. The frequency selective surface (FSS) loaded with active RF devices utilizes the… read more here.

Keywords: frequency selective; physics; varactor diode; varactor ... See more keywords

Dual-Layer Single-Varactor Driven Reflectarray Cell for Broad-Band Beam-Steering and Frequency Tunable Applications

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recommendations! Published in 2018 at "IEEE Access"

DOI: 10.1109/access.2018.2882093

Abstract: A dual-layer active reflectarray configuration is proposed for broad-band beam-steering and/or frequency-tunable applications. A unit cell composed by two stacked fixed-size rectangular patches, properly loaded with a single varactor diode, is designed to realize the… read more here.

Keywords: beam steering; frequency; reflectarray; dual layer ... See more keywords

A Widely Tunable Compact Bandpass Filter Based on a Switched Varactor-Tuned Resonator

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recommendations! Published in 2019 at "IEEE Access"

DOI: 10.1109/access.2019.2929746

Abstract: This paper presents a compact tunable bandpass filter (BPF) based on a switched varactor tuned resonator with a wide frequency-tuning range and a constant absolute bandwidth (ABW). The proposed switched varactors are adopted to overcome… read more here.

Keywords: switched varactor; based switched; varactor; bandpass filter ... See more keywords
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Anti-Series Varactor Network With Improved Linearity Performances in the Presence of Inductive and Capacitive Parasitics

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recommendations! Published in 2021 at "IEEE Access"

DOI: 10.1109/access.2021.3069090

Abstract: This paper proposes a varactor-based circuit technique intended for amplitude and phase control, with improved linearity in the presence of parasitic capacitances and parasitic inductances. The mechanism causing linearity degradation in an anti-series varactor network… read more here.

Keywords: topology; varactor; improved linearity; anti series ... See more keywords

Broadband Frequency-Selective Rasorber With Varactor-Tunable Interabsorption Band Transmission Window

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recommendations! Published in 2019 at "IEEE Transactions on Antennas and Propagation"

DOI: 10.1109/tap.2019.2916739

Abstract: In this paper, we present a frequency-selective rasorber with tunable transmission window located within the absorption band. The rasorber maintains a low reflectivity, which is less than −10 dB in broadband during the tuning process.… read more here.

Keywords: varactor; selective rasorber; band; frequency selective ... See more keywords

Phase Shift Techniques for Improving Varactor-Less QVCO Based on Rotated-Phase-Tuning

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recommendations! Published in 2022 at "IEEE Transactions on Circuits and Systems II: Express Briefs"

DOI: 10.1109/tcsii.2021.3090033

Abstract: This brief proposes and verifies a new phase shifter applied in the rotated phase tuning (RPT) technique in Ka-band. The flexible phase shift in the RPT technique is significant for avoiding the phase ambiguity issue… read more here.

Keywords: varactor; phase shift; phase; phase tuning ... See more keywords

A 10.23–15.7-GHz Varactor-Tuned Microstrip Bandpass Filter With Highly Flexible Reconfigurability

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recommendations! Published in 2021 at "IEEE Transactions on Microwave Theory and Techniques"

DOI: 10.1109/tmtt.2021.3098835

Abstract: This article demonstrates a 10.23–15.7-GHz varactor-tuned microstrip bandpass filter (BPF) with fully controllable center frequency, bandwidth, and transmission zeros. The concept of cascading a tunable low-pass unit together with a tunable high-pass unit is adopted… read more here.

Keywords: ghz varactor; tuned microstrip; microstrip bandpass; filter ... See more keywords

RF Power Harvester With Varactor-Enabled Wide-Power-Range Capability for Wireless Power Transfer Applications

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recommendations! Published in 2025 at "IEEE Transactions on Microwave Theory and Techniques"

DOI: 10.1109/tmtt.2024.3454963

Abstract: This article proposes an approach of designing a wide-power-range RF power harvester integrated with a dc – dc boost converter, in order to facilitate wireless charging driven by wireless power transfer (WPT). The approach addresses… read more here.

Keywords: wireless; power range; varactor; power ... See more keywords