A compact L-band bandpass filter based on SIR coaxial resonators with high multipactor threshold

Bénédicto, Jessica; Rius, Éric; Favennec, Jean-François; Pacaud, Damien; Carpentier, Ludovic; Puech, J.

doi:10.1017/s1759078720001786

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…As apparent, the inset-based designs provide the merits of volume miniaturization and enhanced spurious performance, VOLUME 11, 2023 in addition to the capability of obtaining flexibly controllable quasi-elliptic responses. The first planar configuration in section III-A follows the common folded topology to realize a cross-coupling and create TZs, similar to [7], [11], and [15]. Also, as the inline structure is favourable in many applications, [17] and [18] used orthogonal combline resonators to introduce TZs.…”

Section: B Inset Filters In Longitudinal Configurationmentioning

confidence: 99%

“…On the other hand, combline resonators widely dominate coaxial filters research due to their compact structures with mid-high Q and wide spuriousfree bands (>3•f 0 ). Similarly, as more compactness and volume-saving are always required, various miniaturized combline filters were presented with good spurious performance based on different configurations [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14]. Several of these designs have employed stepped-impedance resonators (SIRs) where the top end of the combline post is enlarged to increase capacitive loading, providing more miniaturization and increasing the band separation to the next spurious resonance [3], [4], [5], [6], [7], [8].…”

Section: Introductionmentioning

confidence: 99%

“…However, this class of filter must take into account weak inter-resonator couplings, manufacturing complexity, and the added weight of the enlarged parts. The second group of miniaturized combline filters employs multiple interlaced compact re-entrant resonators as demonstrated in [9], [10], and [11]. These filters also have relatively complex structures, limited high-power handling capabilities, and increased losses.…”

Section: Introductionmentioning

confidence: 99%

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Design of Compact Quasi-Elliptic Bandpass Filters Based on Coaxial Inset Resonators

2023

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This article reports a novel inset resonator configuration for coaxial filter applications with quasi-elliptic responses. The design and analysis of the inset resonator are discussed in detail and accurately modeled as a capacitively-loaded stepped-impedance half-wavelength resonator featuring more compactness, high quality factor, and enhanced spurious responses in comparison with conventional halfwavelength and combline resonators. Additionally, the operating frequency can be tuned intrinsically through the displacement of the coaxial resonator, eliminating the need for any additional tuning elements and maintaining a stable quality factor. Two quasi-elliptic inset resonator type filters are implemented in planar and longitudinal coupling configurations, respectively. The first takes the form of a folded four-pole 2.93 GHz filter with two symmetrical transmission zeros. The fabricated filter has a compact structure of 29.76 cm 3 , an insertion loss better than 0.73 dB, a return loss better than 18 dB, and a wide spurious-free band up to 3.5•f 0 . The second inset-type quasi-elliptic filter is realized in a longitudinal inline arrangement. An example of a 2.53 GHz three-pole filter is presented with a closely-positioned transmission zero, wide spurious-free band (≈3•f 0 ), and a very compact structure of 55.7×33×33 mm 3 .

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Section: B Inset Filters In Longitudinal Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of Compact Quasi-Elliptic Bandpass Filters Based on Coaxial Inset Resonators

2023

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“…J. Benedicto et al studied [4] an L-Bant filter of 6 th order to be used in space applications. The design is based on stepped impedance coaxial resonators (SIR) satisfying various electrical and dimensional requirements.…”

Section: Introductionmentioning

confidence: 99%

Coaxial Low-Pass Filter Design and Manufacture

E.Yilmaz

ÜÇÜNCÜ

2023

IEEE Access

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In this study, a low-pass filter with coaxial transmission lines is designed and produced.The objective for designing a coaxial low-pass filter was to utilize both low loss transmission and high breakdown voltage capability for high power microwave applications to enable the suppression of the second harmonic of the 4.4-6 GHz C-Band ( C-Band was selected as a proof of concept ) signals with minimal insertion loss. Microwave and 3D electromagnetic simulators were used in the filter design. The design was started by establishing an 11 th order Chebyshev low-pass filter prototype giving 0.05 dB ripple. Based on this prototype, a filter circuit consisting of capacitors and inductors as lumped elements was designed. The low and high impedances to be selected for the stepped impedance method, which is the basis of the transition to coaxial transmission lines, were decided and the most suitable impedances for manufacturing was determined. The filter using these impedances and designed with stepped impedance lines was transformed into the filter in which coaxial transmission lines are used. Coaxial transmission lines in the low-pass filter circuit consist of conductors with an insulating material in between. While the insulating material is selected as air in the high impedance sections of the transmission lines, it is PTFE (Polytetrafluoroethylene) with an insulating constant of 2.1 in the low impedance sections. The designed filter was manufactured. The basic properties of the manufactured filter were characterized by using RF measuring devices and compared with the designed filter. The measurements results prove that the frequency responses of the designed filter and the produced filter are very close to each other. Namely, a low-pass filter with a cutoff frequency of 6 GHz, a sharp suppression of about 45 dB at the stopband of 9 GHz and a return loss of 20 dB was designed and produced by using coaxial transmission lines. The novelty in our work can be stated that the power handling capability is increased by two techniques. The first one is that the highest transmission line radius preventing the higher order mode excitations is used to decrease the conductor loss. Teflon is covered around the low impedance lines to enhance the dielectric breakdown capability. Teflon inclusion is also used to decrease the practical low impedance level that improves the filter characteristics.

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Design and preparation of L-band multilayer low-group delay filter based on inner sputtering

Pan,

Li,

2024

Microelectronics Journal

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A compact L-band bandpass filter based on SIR coaxial resonators with high multipactor threshold

Cited by 8 publications

References 19 publications

Design of Compact Quasi-Elliptic Bandpass Filters Based on Coaxial Inset Resonators

Design of Compact Quasi-Elliptic Bandpass Filters Based on Coaxial Inset Resonators

Coaxial Low-Pass Filter Design and Manufacture

Design and preparation of L-band multilayer low-group delay filter based on inner sputtering

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