A 20–26.5-GHz PCB Bandpass Filter Tuned With Contactless Tuners

Adhikari, Pintu; Yang, Wei; Peroulis, Dimitrios

doi:10.1109/lmwc.2019.2922496

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…To satisfy this requirement, a New Scale Technologies M3-L micro linear actuator is used as the tuning mechanism. These actuators have been used in the past for impedance tuners and filters alike [29], [39]. They provide up to 6 mm of travel with 0.5 µm resolution, making them ideal for applications where large travel range is necessary.…”

Section: Design and Simulation A Impedance Tuner Designmentioning

confidence: 99%

“…EVA cavity-based structures have been successfully used mainly to realize tunable high-Q filters [30], [31], [32], [33], [34], but also in realizing passive sensors [35], diplexers [36], and frequency synthesizers [37]. Such designs have been fabricated by conventional machining for low-frequency applications [32], through silicon microfabrication for high-frequency miniaturized cases [38], [39], and in printed circuit board (PCB) technology using substrate-integrated waveguides (SIWs) for 1-10-GHz applications [40].…”

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confidence: 99%

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Resonant Impedance Tuners: Theory, Design, Power Handling, and Repeatability

Shaffer,

Johnson,

Jones

et al. 2024

IEEE Trans. Microwave Theory Techn.

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The theory of coupled-resonator-based impedance tuners is presented for the first time, establishing coverage limitations for two-and three-resonator designs. Besides the advantages of resonant impedance tuners, practical considerations including resonator loss and limited tuning range are included in the analysis. From this theoretical background, a rigorous design procedure is presented for creating optimal resonant impedance tuners, designed for maximum Smith chart coverage, for both the two-and three-pole structures. A proof-of-concept threepole impedance tuner is created following this procedure. This state-of-the-art tuner achieves at least 90% Smith chart coverage from 4 to 8 GHz while maintaining minimum transducer losses of 0.4 dB. The designed tuner is implemented on printed circuit board (PCB) technology and uses electronically controllable linear actuators for tuning. With these design choices, a repeatability of 48 dB is achieved, while maintaining tuning times of less than 100 ms, and is capable of operating at 100 W. This represents performance competitive with the highest repeatability tuners available today. Moreover, it simultaneously achieves 10× faster response time and >10× smaller footprint than state-of-the-art highly repeatable tuners.

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Section: Design and Simulation A Impedance Tuner Designmentioning

confidence: 99%

mentioning

confidence: 99%

Resonant Impedance Tuners: Theory, Design, Power Handling, and Repeatability

Shaffer,

Johnson,

Jones

et al. 2024

IEEE Trans. Microwave Theory Techn.

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“…A two-pole reconfigurable BPF utilizing the above EVAmode cavity resonator has been designed using standard coupling synthesis techniques to demonstrate the proposed manufacturing method and validate its performance. The design procedure for tunable EVA-mode cavity filters has been extensively reported throughout the literature [8], [9], [24], thus only a brief discussion is included here. A 3-D sketch of the filter is shown in Fig.…”

Section: B Filtermentioning

confidence: 99%

High-Q High Power Tunable Filters Manufactured With Injection Molding Technology

et al. 2022

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This paper presents the first demonstration of injection molding technology to enable large-scale mass manufacturing of high-performance tunable microwave filters to meet the growing needs of 5G small cell stations. This is the first time that a tunable filter satisfies all four of the following requirements simultaneously: low manufacturing cost, high quality factor, wide tuning range, and high power handling. Exhaustive research exists on the use of polymers for 3D microwave device manufacturing; nonetheless, mass-production technologies, such as injection molding, can provide low costs without compromising performance. The proposed bandpass filter implementation uses a tunable evanescent-mode cavity resonator injection molded with acrylonitrile-butadiene-styrene thermoplastic polymer. In addition, changing the critical gap size over the resonator's post through a commercial micro-actuator provides frequency tuning. The measured filter achieves an 86% tuning range from 2.8 -5.2 GHz with a state-of-the-art measured unloaded quality factor Q u of 1548 -2573. The filter has a measured insertion loss of 0.06 -0.1 dB with a fractional bandwidth from 7.6 -8.4 % across the entire tuning range. Moreover, for the first time in this manufacturing technology implementation, a bandpass filter is demonstrated with power handling capabilities beyond 100 W. The manufactured device demonstrates the significant potential of this technology for the scale-up manufacturing of reconfigurable high-Q RF filters without compromising performance.INDEX TERMS Evanescent-mode cavity filter, quality factor (Q), reconfigurable filter, tunable filter, injection molding, scale-up manufacturing method.

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“…By avoiding the bonding of the tuner to the cavity, the contactless tuning scheme showed substantial improvement in the PHC and mechanical reliability of the tuner. This tuning method has been applied to design highpower tunable filters up to Ka-Band [16], and in high-power impedance tuners [17]. In [12], contactless capacitive loading was integrated with a slot on a ground plane to achieve octave tunability from 2-4 GHz, with a bi-directional radiation pattern.…”

Section: Introductionmentioning

confidence: 99%

Tunable SIW-Based Evanescent-Mode Cavity-Backed Slot Antenna With Contactless Tuning

et al. 2023

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This paper presents a frequency reconfigurable evanescent-mode cavity-backed slot antenna (ECBSA) with a wide tuning range, high-power handling capability, and simplified manufacturing. The tuning mechanism consists of external long-range linear actuators and a contactless tuner disc to vary the capacitive loading of an evanescent-mode cavity. The antenna's operating frequency is tuned by changing the cavity's critical gap size. Radiation occurs through an annular slot aperture on the cavity's ground plane. The design is realized on a printed circuit board (PCB) using substrate-integrated waveguide (SIW) technology to facilitate easier system integration with other planar circuits. The fabricated prototype of the antenna shows 40% tuning from 1.71-2.58 GHz when the contactless tuner is displaced vertically across a distance of 508 µm. Measurement results for the peak realized gain of ECBSA is as high as 5.48 dB at the maximum operating frequency of 2.58 GHz. Due to a larger range of the cavity's critical gap sizes, achieved using external linear actuators, the power handling capability is higher than the typically used piezoelectric disk tuners in ECBSA design. The proposed antenna also exhibits the largest tuning range among the highpower mechanically-tuned cavity-backed slot antennas presented in the literature.INDEX TERMS Tunable slot antennas, evanescent-mode cavity, high-power, contactless tuning, substrateintegrated waveguide (SIW)

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A 20–26.5-GHz PCB Bandpass Filter Tuned With Contactless Tuners

Cited by 10 publications

References 10 publications

Resonant Impedance Tuners: Theory, Design, Power Handling, and Repeatability

Resonant Impedance Tuners: Theory, Design, Power Handling, and Repeatability

High-Q High Power Tunable Filters Manufactured With Injection Molding Technology

Tunable SIW-Based Evanescent-Mode Cavity-Backed Slot Antenna With Contactless Tuning

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