Design of C-Band Interdigital Filter and Compact C-Band Hairpin Bandpass Film Filter on Thin Film Substrate

Tan, Min; Xuan, Yang; Ma, Yong; Li, Li; Zhuang, Yonghe

doi:10.1007/978-3-319-51697-4_5

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…Similar examples can be found in other fictions [194][195][196][197][198][199][200][201]. And, again, we are not limited to people vanishing; not only do objects [202] or entire worlds vanish [203], but sometimes things change in other ways, e.g., writing on a wall appearing in the present as a time traveler scrawls on the wall back in the past [204], or a mark on a table appearing in the present 'simultaneous' with someone on the other end of an anti-telephone burning it by accident [180].…”

Section: Morphing Non-time Travelerssupporting

confidence: 73%

The Close Possibility of Time Travel

Effingham

2023

Philosophies

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This article discusses the possibility of some outlandish tropes from time travel fiction, such as people reversing in age as they time travel or the universe being destroyed because a time traveler kills their ancestor. First, I discuss what type of possibility we might have in mind, detailing ‘close possibility’ as one such candidate. Secondly, I argue that—with only little exception—these more outlandish tropes fail to be closely possible. Thirdly, I discuss whether these outlandish tropes may nevertheless be more broadly possible (e.g., metaphysically or logically possible), arguing that whether they are or not depends upon your favored metaphysics of the laws of nature.

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Section: Morphing Non-time Travelerssupporting

confidence: 73%

The Close Possibility of Time Travel

Effingham

2023

Philosophies

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“…Although LTCC and MEMS processes can achieve small size through multi-layer design, they are more expensive than PCB or thin film processes. In [12], an interdigital filter with an L-shaped structure composed of a SIR is designed based on thin film process. Its size is only 5 mm * 5 mm (0.35λ g * 0.35λ g ).…”

Section: Introductionmentioning

confidence: 99%

A Novel Miniaturized Capacitor Loaded Interdigital Filter

Tang¹,

Jiang²,

Wu³

et al. 2022

PIER M

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This paper proposes a novel miniaturized interdigital capacitor loaded interdigital filter, which is applied in C-band (3.2 GHz ∼ 4.2 GHz). By loading an interdigital capacitor on the open end of the resonator of the interdigital filter, the length of the resonator is shortened by 28%. The resonant frequency offset caused by tap introduction is adjusted by using the method of impedance compensation at the open end of resonator 1 and resonator 5, which further reduces the size of the filter. The miniaturized filter is fabricated on a 0.254 mm-thickness alumina substrate with relative dielectric constant of 9.8 by thin film process. Measured results are as follows: the passband of the filter is 3.2 GHz ∼ 4.2 GHz; the insertion at center frequency is −1 dB; the return loss is less than −18.3 dB. The size of the filter is 4.98 mm * 6.45 mm (0.15λ g * 0.20λ g ), which is 37.8% smaller than that of the traditional interdigital filter.

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Compact 5G Nonuniform Transmission Line Interdigital Bandpass Filter for 5G/UWB Reconfigurable Antenna

et al. 2022

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In this study, at two different fifth generation (5G) low-frequency bands (3.7–4.2 GHz and 5.975–7.125 GHz) and based on nonuniform transmission lines (NTLs) theory, a compact three-quarter-wave resonators interdigital bandpass filter (IBPF) is analyzed, designed, and fabricated. The compact proposed filter is considered as a good candidate for reconfigurable 5G low-frequency bands and ultrawide band (UWB) antenna, which will reduce the size of the final RF communication system. Firstly, a uniform transmission line (UTL) IBPF at these two bands is designed and tested; then the NTL concept is applied for compactness. For both UTL and NTL IBPFs, different parametric studies are performed for optimization. At the first frequency band, size reductions of 16.88% and 16.83% are achieved in the first (symmetrical to the third resonator) and second λ/4 resonator of UTL IBPF, respectively, with up to 36.6% reduction in the total area. However, 16.46% and 16.33% size reductions are obtained in the first (symmetrical to the third resonator) and second λ/4 resonator, respectively, at the second frequency band with a 40.53% reduction in the whole circuit area. The performance of the proposed NTL IBPF is compared with the UTL IBPF. The measured reflection coefficient of the proposed NTL IBPF, S11, appears to be less than −10.53 dB and −11.27 dB through 3.7–4.25 GHz and 5.94 GHz–7.67 GHz, respectively. However, the transmission coefficient, S12 is around −0.86 dB and–1.7 dB at the center frequencies, fc= 3.98 GHz and 6.81 GHz, respectively. In this study, simulations are carried out using high-frequency structure simulator (HFSS) software based on the finite element method (FEM). The validity of the proposed theoretical schematic of this filter is proved by design simulations and measured results of its prototype.

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Design of C-Band Interdigital Filter and Compact C-Band Hairpin Bandpass Film Filter on Thin Film Substrate

Cited by 4 publications

References 4 publications

The Close Possibility of Time Travel

The Close Possibility of Time Travel

A Novel Miniaturized Capacitor Loaded Interdigital Filter

Compact 5G Nonuniform Transmission Line Interdigital Bandpass Filter for 5G/UWB Reconfigurable Antenna

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