Tunable ceramic waveguide filter
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsJichuan Zhang, Juandi Song, Hongyu Xu
Life of this patent
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Abstract
A ceramic radio frequency (RF) filter is provided, including a first ceramic block and a second ceramic block attached on top of the first ceramic block. One or more through-holes are provided through the first block, and one or more corresponding blind-holes are provided in the second block and at least partially aligned with the one or more through-holes of the first block. The filter further includes input and output terminals arranged at the first block, for injecting and extracting, respectively, a signal into/from the first block. A method of manufacturing the filter is also provide, including an optional step of performing a frequency-adjustment of the RF filter by adjusting a depth and/or size of at least one blind-hole.
Claims15
A ceramic radio frequency (RF), comprising:
- a first ceramic block with a top surface, a bottom surface, and side surfaces, and with one or more resonance through-holes extending through the first ceramic block from its top surface to its bottom surface, and wherein the first ceramic block is configured for being surface-mounted with its bottom surface to a printed circuit board;
- input and output terminals arranged at the first ceramic block and configured for injecting and extracting, respectively, a signal into/from the first ceramic block, and
- a second ceramic block with a top surface, a bottom surface, and side surfaces, and with one or more blind-holes extending only partially through the second ceramic block from its top surface towards its bottom surface,
- wherein the second ceramic block is attached on top of the first ceramic block with its bottom surface facing the top surface of the first ceramic block, and
- wherein each of the one or more blind-holes of the second ceramic block is at least partially aligned with a corresponding one of the one or more through-holes of the first ceramic block.
A method for manufacturing of a ceramic radio frequency (RF), comprising:
- in a first ceramic block having a top surface, a bottom surface, and side surfaces, providing one or more resonance through-holes extending through the first ceramic block from its top surface to its bottom surface;
- in a second ceramic block having a top surface, a bottom surface, and side surfaces, providing one or more blind-holes extending only partially through the second ceramic block from its top surface towards its bottom surface, such that if the second ceramic block is attached on top of the first ceramic block with its bottom surface facing the top surface of the first ceramic block, each of the one or more blind-holes is at least partially aligned with a corresponding one of the one or more through-holes of the first ceramic block, and
- performing such an attaching of the second ceramic block on top of the first ceramic block.
Dependencies are inferred from the claim text.