Highly Reconfigurable Dual-Band Coupler With Independently Tunable Frequency and Coupling Coefficient at the Lower Band

Pan, Yu Fei; Zheng, Shao Yong; Hong, Wonbin; Chan, Wing Shing

doi:10.1109/tie.2020.2975459

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…In order to accomplish the required functionality, a patch coupler with a coupled line loaded using a varactor was suggested. The suggested coupling coefficient and the coupler's frequency at the lower frequency band can be changed independently while keeping the features at the upper band static by adjusting the voltages applied to the varactors [40].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Mode Reconfigurable Antenna with V-Shaped Extrudes for Cognitive Radio Applications

Sharma

Rathi

Al-Khafaji³

et al. 2023

Electronics

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As the same device may be used for various types of applications, antennas must have the capacity to perform multiple functions. Reconfiguring the polarization, operational frequency, and radiation pattern can create an outcome of multi-functionality. A hybrid, frequency- and pattern-reconfigurable antenna with two V-shaped extrudes in a patch is proposed. To increase the bandwidth of the proposed antenna, the defected ground structure (DGS) phenomenon is presented, which is significant in the bandwidth of 3200 MHz from 2.7 GHz to 5.9 GHz, providing a gain of 3.5 dB. For this design, an FR-4 material was chosen as the substrate, and CST software was used for simulation. Using two p-i-n diodes, the projected antenna illustrates switching for multi-frequency bands such as 1.5, 2.6, 3.2, 5.1, and 8.1 GHz, with a constant radiation pattern and a main lobe direction of 155 degrees. It has C-band, WLAN, cognitive radio (CR), and Bluetooth applications. The proposed antenna displays radiation pattern switching at 3.5 GHz, showing variation between 7°, 158°, 173°, and 175°, and at 4 GHz, it demonstrates switching between 11°, 15°, 165°, and 344°, which defines the hybrid reconfiguration.

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Section: Introductionmentioning

confidence: 99%

Hybrid Mode Reconfigurable Antenna with V-Shaped Extrudes for Cognitive Radio Applications

Sharma

Rathi

Al-Khafaji³

et al. 2023

Electronics

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“…A dual-band coupler with wide separation between frequency bands was designed by applying three cascade coupled sections in the coupler branches [20]. Reconfigurable dual-band coupler designs were also presented [21,22]. Another technique in designing compact couplers by using coupled resonators was introduced in [23].…”

Section: Introductionmentioning

confidence: 99%

Dual-Band/Dual-Mode Rat-Race/Branch-Line Coupler Using Split Ring Resonators

et al. 2021

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A novel dual-band/dual-mode compact hybrid coupler which acts as a dual-band branch-line coupler at the lower band and as a rat-race coupler at the higher band is presented in this paper. One of the most interesting features of the proposed structure is that outputs of the proposed coupler in each mode of operation are on the same side. This unique design is implemented using artificial transmission lines (ATLs) based on open split ring resonators (OSRR). The low-cost miniaturized coupler could be operated as a dual-band 90° branch-line coupler at 3.3 and 3.85 GHz and 180° rat-race coupler at 5.3 GHz. The proposed coupler could be utilized in the antenna array feeding circuit to form the antenna beam. The structure’s analytical circuit design based on its equivalent circuit model is provided and verified by measurement results.

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“…There is a great variety of both theoretical and experimental studies on achieving tunable coupling coefficients [32][33][34][35][36][37] for the optical as well as the RF regime. To reflect the potential of our proposal in a more substantial manner, we will briefly discuss the theoretical upper bound for the tuning capability of the suggested scheme with a simple mathematical formulation.…”

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confidence: 99%

Four-channel parity-time symmetry

Özgün¹,

Özbay²,

Özdür³

2022

EPL

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In this letter, we propose a general scheme for four-channel parity-time symmetry. We theoretically demonstrate how to achieve novel features via exploiting the parity-time symmetry for four-channel coupled-mode equations and study the spontaneous symmetry breaking manifold, separating the parity-time symmetric and parity-time broken regimes, for various parameter conﬁgurations. We also propose a possible candidate (an optoelectronic oscillator) which can demonstrate the theoretically derived features, which include, broadband tunability, eigenfrequency selection and ﬂipping, and single/dual frequency operation regimes.

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Highly Reconfigurable Dual-Band Coupler With Independently Tunable Frequency and Coupling Coefficient at the Lower Band

Cited by 10 publications

References 23 publications

Hybrid Mode Reconfigurable Antenna with V-Shaped Extrudes for Cognitive Radio Applications

Hybrid Mode Reconfigurable Antenna with V-Shaped Extrudes for Cognitive Radio Applications

Dual-Band/Dual-Mode Rat-Race/Branch-Line Coupler Using Split Ring Resonators

Four-channel parity-time symmetry

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