Continuously tunable substrate integrated waveguide bandpass filter in liquid crystal technology with magnetic biasing

Prasetiadi, Ananto Eka; Karabey, Onur Hamza; Weickhmann, C.; Franke, Tobias; Hu, Wenjuan; Jost, Matthias; Nickel, Matthias; Jakoby, Rolf

doi:10.1049/el.2015.2494

Cited by 29 publications

(14 citation statements)

References 6 publications

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“…This is due to a much thinner LC layer which can be tuned faster with lower voltages. Also, substrate integrated waveguides (SIW) [56,57] will probably play a significant role in the future. The right technology has always to been chosen based on a tradeoff.…”

Section: Discussionmentioning

confidence: 99%

Microwave Liquid Crystal Technology

et al. 2018

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Tunable Liquid Crystal (LC)-based microwave components are of increasing interest in academia and industry. Based on these components, numerous applications can be targeted such as tunable microwave filters and beam-steering antenna systems. With the commercialization of first LC-steered antennas for Ku-band e.g., by Kymeta and Alcan Systems, LC-based microwave components left early research stages behind. With the introduction of terrestrial 5G communications systems, moving to millimeter-wave communication, these systems can benefit from the unique properties of LC in terms of material quality. In this paper, we show recent developments in millimeter wave phase shifters for antenna arrays. The limits of classical high-performance metallic rectangular waveguides are clearly identified. A new implementation with dielectric waveguides is presented and compared to classic approaches.

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Section: Discussionmentioning

confidence: 99%

Microwave Liquid Crystal Technology

et al. 2018

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“…Liquid crystal is mainly used in microwave circuit to build liquid crystal circuit. New liquid crystal transmission lines such as substrate integrated waveguide [13] and CRLH-transmission line [14] have also been proposed.…”

Section: Theory Of Liquid Crystal a Theory Of Liquid Crystal Micmentioning

confidence: 99%

Millimeter-Wave Broadband Tunable Band-Pass Filter Based on Liquid Crystal Materials

Jiang

et al. 2020

IEEE Access

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In this paper, a wideband band-pass frequency tunable filter using liquid crystal is proposed for millimeter-wave applications, which achieves the band-pass characteristics by introducing four transmission zeros. The main filter structure is the ring resonator loaded with two quarter-wavelength open stubs using inverted microstrip structure. The ring resonator contacts directly with the liquid crystal layer to control the bias voltage to adjust the dielectric constant of the liquid crystal material. Experimental results show that the central frequency reconstruction range varies from 27.7GHz to 24.6GHz, and the corresponding relative bandwidth changes from 48.17% to 49.82%. The group delay within the pass-band is less than 0.45ns before and after the filter reconstruction, which indicates its applicability in K-band filter. INDEX TERMS Wideband bandpass filter, tunable, liquid crystal, ring resonator.

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“…A magnetically tunable SIW-LC bandpass filter has been demonstrated in [21], resulting in a device with a Q-factor up to 105.6 operating around 20 GHz. Since the magnets consume a lot of space resulting in a bulky device, an electrically tunable International Journal of Microwave and Wireless Technologies 677 SIW-LC bandpass filter is proposed in this paper.…”

Section: Electrically Tunable Lc-based Siw Filtermentioning

confidence: 99%

Liquid-crystal-based amplitude tuner and tunable SIW filter fabricated in LTCC technology

Prasetiadi

Jost

Schulz

et al. 2018

Int. J. Microw. Wireless Technol.

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Tunable microwave devices will play an important role in future wireless systems, in which high-frequency bands, e.g. millimeter waves, will become promising, due to its huge spectrum availability. At such frequency bands, liquid crystals (LCs) exhibit low microwave loss, which is excellent compared with the other tuning elements. In this paper, LC-based microwave components are fabricated by using low temperature co-fired ceramic technology, allowing the integration of the LC into microwave structures. The first component, the amplitude tuner, controls the signal's amplitude by using the interference concept, which exhibits a tunable attenuation range from 11 dB to 30 dB at 30 GHz. The second component is a 3-pole tunable bandpass filter, which is realized by using a substrate integrated waveguide topology, enabling a device with comparatively high-quality factors (Q-factors). The measurement results show Q-factors in the range of 68 to 100 for a frequency tuning of 29.4–30.1 GHz, i.e. a tuning range of 700 MHz, accompanied by an insertion loss 2 dB to 4 dB.

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Continuously tunable substrate integrated waveguide bandpass filter in liquid crystal technology with magnetic biasing

Cited by 29 publications

References 6 publications

Microwave Liquid Crystal Technology

Microwave Liquid Crystal Technology

Millimeter-Wave Broadband Tunable Band-Pass Filter Based on Liquid Crystal Materials

Liquid-crystal-based amplitude tuner and tunable SIW filter fabricated in LTCC technology

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