New coaxial low-pass filters with ultra-wide and spurious free stopband

Goulouev, Rousslan; McLaren, Colin; Pardo, Marta Padilla

doi:10.1017/s1759078721001501

Cited by 2 publications

(3 citation statements)

References 14 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A ninth-order Chebyshev-type low-pass filter consists of four units based on such a structure is constructed for simulation, and the outer conductor is assumed to be the fabricated Ag conductor. The corresponding results are shown in Figure f, and samples 1 and sample 2 display typical characteristic curves of a stepped impedance coaxial LPF with different cutoff frequencies of ∼35 and ∼28 GHz due to the difference in high impedance branch’s diameter, respectively, ,, Before the cutoff frequency, higher diameter in high impedance branch (neck) generates lower impedance and lower loss, and thus, sample 1 exhibits smaller return loss (S11) and higher transmission efficiency (S21) compared to that of sample 2. These demonstrations depict the promising potential of this novel strategy in constructing RF electronics, which will bring great innovation in improving fabrication efficiency and diversity.…”

Section: Results and Disscussionmentioning

confidence: 99%

Multicore–Shell Direct Ink Writing of Coaxial Transmission Lines

Ren,

Xing,

Wang

et al. 2024

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

Coaxial architectures have been widely employed in diverse devices due to the symmetrical feature in the circumferential direction. Compared to conventional manufacturing methods exemplifying template-assisted layer-by-layer deposition and coaxial spinning/ drawing, multicore−shell direct ink writing (DIW) is more efficient and universal to fabricate coaxial architectures due to the low cost, wide material compatibility, and high 3D customization. However, previous multicore−shell printing strategies have mainly focused on single core patterns and lacked metal ink with a low sintering temperature, limiting their further application such as in radio frequency (RF) transmission lines. Here, for the first time, we demonstrate a strategy to realize multicore patterns within coaxial fibers composed of highly purified metal with low sintering temperature and heat-resisting dielectric materials through adjusting the printing parameters, enabling diverse modes of core patterns in multicore−shell DIW including accumulation, equivalence, thinning, and necklace modes. As a proof of concept method, we demonstrate a coaxial waveguide and coaxial stepped impedance low-pass filter, expanding the applications to RF transmission lines. This strategy will provide inspirable avenues to the different fields of science and engineering.

show abstract

Section: Results and Disscussionmentioning

confidence: 99%

Multicore–Shell Direct Ink Writing of Coaxial Transmission Lines

Ren,

Xing,

Wang

et al. 2024

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

show abstract

“…It is very important to consider the reflection and transmission parameters in filter design. While 11 S and 22 S are reflection parameters, 12 S and 21 S are transmission parameters. For the waves returning from the second port to the first port, 11 S is examined.…”

Section: Filter Design and Simulation Studiesmentioning

confidence: 99%

“…Rousslan Goulouev et al [12] proposed a new coaxial low-pass filter (LPF) concept and design methodology. The proposed LPF consists of an array of cavity elements and operates with transverse electromagnetic mod (TEM) and transverse magnetic (TM) coupled resonators.…”

Section: Introductionmentioning

confidence: 99%

Coaxial Low-Pass Filter Design and Manufacture

E.Yilmaz

ÜÇÜNCÜ

2023

IEEE Access

View full text Add to dashboard Cite

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.

show abstract

New coaxial low-pass filters with ultra-wide and spurious free stopband

Cited by 2 publications

References 14 publications

Multicore–Shell Direct Ink Writing of Coaxial Transmission Lines

Multicore–Shell Direct Ink Writing of Coaxial Transmission Lines

Coaxial Low-Pass Filter Design and Manufacture

Contact Info

Product

Resources

About