Design and Implementation of an RF Coupler Based on YBCO Superconducting Films

Holdengreber, Eldad; Mizrahi, Moshe; Glassner, E.; Dahan, Y.; Castro, H.; Farber, E.

doi:10.1109/tasc.2014.2379720

Cited by 12 publications

(4 citation statements)

References 11 publications

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“…The implementation of the MS line with HTSC, such as YBCO, is challenging since the production of YBCO layers are usually limited to a diameter of about 3" [29]. In order to fit the MS line to the wafer, a meander-line was carefully implemented [30,31].…”

Section: Simulations and Designmentioning

confidence: 99%

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

et al. 2021

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A new measurement technique of electrical parameters of superconducting thin films at the Very High Frequency (VHF) range is described, based on resonators with microstrip (MS) structures. The design of an optimal resonator was achieved, based on a thorough theoretical analysis, which is required for derivation of the exact configuration of the MS. A theoretical model is presented, from which an expression for the attenuation of a MS line can be derived. Accordingly, simulations were performed, and an optimal resonator for the VHF range was designed and implemented. Production constraints of YBa2Cu3O7 (YBCO) limited the diameter of the sapphire substrate to 3″. Therefore, a meander configuration was formed to fit the long λ/4 MS line on the wafer. By measuring the complex input reflection coefficients of a λ/4 resonator, we extracted the quality factor, which is mainly affected by the dielectric and conductor attenuations. The experimental results are well fitted by the theoretical model. The dielectric attenuation was calculated using the quasi-static analysis of the MS line. An identical copper resonator was produced and measured to compare the properties of the YBCO resonator in reference to the copper one. A quality factor of ~6·105 was calculated for the YBCO resonator, three orders of magnitude larger than that of the copper resonator. The attenuation per unit length of the YBCO layer was smaller by more than five orders of magnitude than that of the copper.

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Section: Simulations and Designmentioning

confidence: 99%

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

et al. 2021

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“…The cryogenic measurement system is illustrated in Figure A4. The system is composed of three main elements: a VNA, a computing system, and a polystyrene liquid nitrogen container [46][47][48]. The S-parameters were measured using the VNA, while the Device Under Test (DUT) was immersed in liquid nitrogen.…”

Section: Appendix Bmentioning

confidence: 99%

High-Performance RF Balanced Microstrip Mixer Configuration for Cryogenic and Room Temperatures

et al. 2021

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A high-performance S-band down-conversion microstrip mixer, for operation from 77 K to 300 K, is described. The balanced mixer combines a 90 degree hybrid coupler, two Schottky diodes, a band pass filter, and a low pass filter. The coupler phase shift drastically improves noise rejection. The circuit was implemented according to the configuration obtained from extensive simulation results based on electromagnetic analysis. The experimental results agreed well with the simulation results, showing a maximum measured insertion loss of 0.4 dB at 2 GHz. The microstrip mixer can be easily adjusted to different frequency ranges, up to about 50 GHz, through the proper choice of microstrip configuration. This novel S-band cryogenic mixer, implemented without resorting to special components, shows a very high performance at liquid nitrogen temperatures, making this mixer very suitable for high-temperature superconductive applications, such as front-ends.

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“…We developed a high-performance phase shifter for the VHF band to reduce total system losses using High-Temperature Superconducting (HTSC) technology. A three-channel multi-coupler system was implemented with HTSC components [8][9][10]. To achieve phase matching, it is necessary to incorporate in the phase shifter a specific capacitance adapted to the frequency combination of operation [11].…”

Section: Introductionmentioning

confidence: 99%

Low Loss Multi-Channel Communication Combiner for Cellular Applications

Rosenberg,

Koral,

Mekeyess

et al. 2023

IEEE Access

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The increasing demand for cellular communication channels calls for multichannel solutions. Using one antenna for each channel results in a high density of antennas at the compact cellular station front, which generates inter-channel interference. This may result in distractive interference and significant losses at the output and input of the channels. To overcome these drawbacks, we propose a technology that combines several channels into a single antenna. We implemented a frequency-tuned, multi-channel phase control system with a phase shifter connected to each channel, with low insertion loss and low return loss. The phase shifter is composed of an ultra-wideband coupler and a computer-controlled capacitor. To obtain low insertion loss of the phase shifter, typically 1.5 dB, we designed a planar tandem hybrid coupler for the desired frequency range. We used a capacitor bank of varactor diodes for frequency tuning. The capacitance of these diodes was controlled by the applied reverse bias voltage generated by a D/A converter. The control computer received the digital input to the converter through a serial communication line. The channels were simultaneously phase matched to minimize channel losses. We performed an extensive theoretical analysis of a multi-channel frequency combiner. Based on the simulation results, a three-channel multi-coupler was implemented. The high performance of the system was demonstrated experimentally.

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Design and Implementation of an RF Coupler Based on YBCO Superconducting Films

Cited by 12 publications

References 11 publications

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

High-Performance RF Balanced Microstrip Mixer Configuration for Cryogenic and Room Temperatures

Low Loss Multi-Channel Communication Combiner for Cellular Applications

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