Tunable Ka-band waveguide resonators and a small band band-pass filter based on liquid crystals

Franke, Tobias; Gaebler, Alexander; Prasetiadi, Ananto Eka; Jakoby, Rolf

doi:10.1109/eumc.2014.6986439

Cited by 22 publications

(16 citation statements)

References 2 publications

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“…This paste is almost transparent to the high-frequency field but it is resistive for the DC or low frequency biasing signal. All of these materials are qualified for space applications [4,7].…”

Section: Ltcc Fabrication Technologymentioning

confidence: 99%

“…On the other hand, waveguide structures offer tunable filters with higher Q-factors. LC-based waveguide filters have been reported [4], where Q-factors better than 170 around 20 GHz are obtained. However, waveguide filters are usually very bulky.…”

Section: Electrically Tunable Lc-based Siw Filtermentioning

confidence: 99%

“…It can be seen that the Q-factors of the SIW filter are higher compared with planar LC-based filters, which yield Q-factors typically below 40. Although waveguide filters [4] are expected to have a better Q-factor, its size and weight are drawbacks. Compared with the other tuning elements, the operating frequency of this filter is generally much higher with comparable Q-factors, which makes this LC filter more promising.…”

Section: Electrically Tunable Siw-lc 3-pole Bandpass Filtermentioning

confidence: 99%

“…Integration of LC into phase shifters have been successfully demonstrated in [2,3] with the help of LTCC technology. Moreover, this combination of LC and LTCC is also suitable for space applications [4], which gives an advantage compared with the other technologies.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Ltcc Fabrication Technologymentioning

confidence: 99%

Section: Electrically Tunable Lc-based Siw Filtermentioning

confidence: 99%

Section: Electrically Tunable Siw-lc 3-pole Bandpass Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The unloaded Q-factor is 102-105. 6. The resonator is employed to create a three-pole Chebyshev filter with a centre frequency of 22 GHz and a bandwidth of 600 MHz.…”

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confidence: 99%

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

Prasetiadi¹,

Karabey²,

Weickhmann³

et al. 2015

Electron. lett.

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A liquid crystal filled continuously tunable substrate integrated waveguide filter is proposed which has a high‐quality (Q) factor. To measure the Q‐factor, a single resonator measurement is performed by using magnetic biasing in a lab demonstrator for a proof of concept. The unloaded Q‐factor is 102–105.6. The resonator is employed to create a three‐pole Chebyshev filter with a centre frequency of 22 GHz and a bandwidth of 600 MHz. Measurement results show a 6 dB insertion loss with a return loss of about 10 dB. The filter is continuously tunable within a tuning range of 610 MHz.

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Continuously tunable substrate integrated coaxial line bandpass filters with liquid crystal technology

2021

Micro & Optical Tech Letters

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This letter introduces two continuously tunable bandpass filters with substrate integrated coaxial line (SICL) and liquid crystal (LC) technologies. The tunability of the filters is a kind of electric tuning, achieved by the permittivity changing of the LC material filled in the SICL cavities. The SICL resonator and the electric and magnetic coupling between the resonators are investigated. Then, fourth-order direct-coupled and cross-coupled tunable filters (Filter I and II) with center frequency of 6.5 GHz are designed, fabricated, and measured. The experimental results show that the continuous tuning ranges are 220 and 280 MHz for Filter I and II, respectively. Furthermore, the insertion losses of the Filter I and II are 3.93-4.78 dB and 3.65-4.3 dB over the whole tuning range.

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Tunable Ka-band waveguide resonators and a small band band-pass filter based on liquid crystals

Cited by 22 publications

References 2 publications

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

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

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

Continuously tunable substrate integrated coaxial line bandpass filters with liquid crystal technology

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