Beijing BDStar Navigation has been granted a patent for an ultra-wide passband five-order band-pass filter utilizing an LTCC process. The filter features a ceramic substrate with five parallel resonators, achieving a passband range of 3.64 to 7.04 GHz and significant out-of-band suppression. GlobalData’s report on Beijing BDStar Navigation gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Beijing BDStar Navigation, Smart factory applications was a key innovation area identified from patents. Beijing BDStar Navigation's grant share as of July 2024 was 52%. Grant share is based on the ratio of number of grants to total number of patents.
Ultra-wide passband five-order band-pass filter using ltcc process
The patent US12074579B2 describes an ultra-wide passband five-order band-pass filter utilizing a low temperature co-fired ceramic (LTCC) process. The filter comprises a ceramic substrate that integrates five parallel resonators, a grounding polar plate, two series connection capacitors, two series connection inductors, a cross-coupling capacitor, and a parallel inductor. The design features a symmetrical arrangement of the resonators and includes specific connections between the resonators and capacitors/inductors to optimize performance. The ceramic substrate is made from a material with a dielectric constant of 9.8 and a low dissipation factor of 0.003, while the electrodes are printed with silver. The filter operates within a passband range of 3.64 to 7.04 GHz, achieving a maximum insertion loss of 1.75 dB and demonstrating significant suppression in both low-end and high-end stopbands.
Further detailing the structure, the ceramic substrate is divided into ten layers, with the grounding polar plate positioned at the bottom layer. Each inductor and capacitor is connected through hole pillars that facilitate electrical connections across the layers. The design incorporates mirror-symmetrical and centrally symmetrical structures for various components, enhancing the filter's performance characteristics. The cross-coupling capacitor and parallel inductor are specifically designed to optimize coupling between the resonators. The filter's innovative architecture and material choices contribute to its effective performance across a wide frequency range, making it suitable for applications requiring high-frequency signal processing.
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