Compact low loss alumina band-pass filter in Ku band using layer-by-layer stereolithography technology

Khalil, Ali; Delhote, Nicolas; Pothier, A.; Bessaudou, Annie; Baillargeat, Dominique; Verdeyme, Serge; Leblond, Hervé

doi:10.1109/mwsym.2009.5165985

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…Different ceramic AM approaches are discussed in the literature. Within the area of microwave components, a stereolithography based approach was recently used for the manufacturing of resonators and filters [9]- [12], [26]- [29].…”

Section: Ceramic Additive Manufacturingmentioning

confidence: 99%

Ceramic Additive Manufactured Monolithic X-Shaped TM Dual-Mode Filter

et al. 2022

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This paper presents a monolithic 3D-printed ceramic X-shaped dual-mode microwave filter. The filter is manufactured utilizing a lithography-based ceramic manufacturing (LCM) process, allowing the realization of the resonator as well as the housing in one single piece. Therefore, contact as well as alignment problems, usually arising between a ceramic in T M mode operation and a metallic enclosure, can conveniently be avoided. A fourth order dual-mode filter with a designed center frequency of 6 GHz and a bandwidth of 279 MHz is realized in alumina material. Practical design rules to be considered in the filter layout process as well as limitations imposed by the LCM approach are discussed. The outer surface of the ceramic cavity is subsequently metallized using a silver spray-coating. Advantageously, the metallization is only a few micrometers thick, wherefore the weight of the component can be reduced. The measurement results are compared to the simulation and reveal good agreement. A temperature stability measurement shows a center frequency downward shift of 0.22%.INDEX TERMS 3D-printed ceramic filter, additive manufacturing, alumina 3D printing, dielectric TM dualmode filter, monolithic ceramic filter.

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Section: Ceramic Additive Manufacturingmentioning

confidence: 99%

Ceramic Additive Manufactured Monolithic X-Shaped TM Dual-Mode Filter

et al. 2022

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“…This type of feeding is already validated in [5] and [8]; accesses are screen-printed just over the first and the fifth cavities after the screen printing metallization of the upper metallic layer.…”

Section: A Proposed Structurementioning

confidence: 99%

Quasi-Elliptic and Chebyshev Compact LTCC Multi-Pole Filters Functioning in the Submillimetric Wave Region at 150 GHz

Khalil¹,

Passerieux²,

Baillargeat³

et al. 2010

IEEE Trans. Microwave Theory Techn.

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This paper proposes, for the first time to the best of our knowledge, two challenging LTCC multi-pole bandpass filters operating at 150 GHz for radioastronomy applications. Low-temperature co-fired ceramic (LTCC) technology is employed to realize these filters because it assures the high precision and compactness needed at this high frequency. The two filters are optimized by 3-D electromagnetic simulations and are validated by experimental results. Different positive and negative couplings, which are achieved by different coupling apertures, are studied. The five-pole Chebyshev filter has 8.4 dB of insertion loss in a 1.31% fractional bandwidth for 6.7 mm 2.45 mm lateral dimensions. The fourpole quasi-elliptic filter is conceived to decrease insertion loss by decreasing the number of resonant cavities while conserving the same selectivity by introducing two transmission zeros around the passband. Beside 5.5 dB of insertion loss, this filter occupies a more compact circuit area (3.32 mm 2.37 mm) and insures a very good spurious free region (16 GHz) around 150 GHz. Experimental results are in good agreement with the theoretical ones and validate the use of LTCC technology at such high frequencies over 100 GHz.

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“…The filter is fed by short-circuited coplanar lines to ensure the coupling with the electromagnetic field of the resonant cavity. This type of feeding is already validated in [I] and [5]; accesses are etched after the screen printing metallization of the upper metallic layer.…”

Section: A Structure and Technology Factsmentioning

confidence: 99%

“…Fig.2 shows a study carried out on a simple resonant cavity operating on mode TEJ03 to examine the influence of the number of layers on the unloaded quality factor. This study is performed in free oscillations by applying 3D EM simulations with a homemade code based on the finite Element method already validated in [1] and [5].…”

Section: B Operating Mode Of the Resonant Cavitymentioning

confidence: 99%