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AssigneeCTS Corporation
InventorsTerry R. Bloom, Mark D. Erickson, Ronald D. Guyer, Raymond G. Blair, Jeffrey R. Jacquin, Shouliang Lai
Estimating the term…
A cost-effective communication filter is prepared by etching the surfaces of a shaped and fired ceramic core, applying an electroless nickel solution to create a nickel layer of limited thickness, electroplating the nickel plated core with a silver layer, patterning the nickel and silver plated core by removing metallization from selected surface areas and then heating the patterned filter block to bond the metal layers. The resulting filters comprise a rigid dielectric core defining a plurality of through-hole passages extending between opposing sides of the core. Present on the core is a pattern of metallized and unmetallized regions wherein the metallized regions of the pattern include an inner layer of nickel and an outer silver-containing layer.
A communication signal filter comprising:
A duplexing communication signal filter adapted for connection to an antenna, a transmitter and a receiver for filtering an incoming signal from the antenna to the receiver and for filtering an outgoing signal from the transmitter to the antenna, the filter comprising:
A method for manufacturing a communication filter comprising:
A method for manufacturing a communication filter comprising:
Dependencies are inferred from the claim text.
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Comb or interdigital filters; Cascaded coaxial cavities: comb filters or interdigital filters with metallised resonator holes in a dielectric block
Combining or separating two or more different frequencies: using comb or interdigital filters; using cascaded coaxial cavities
Waveguides
Term end not estimated
This invention relates to dielectric block filters for radio-frequency signals.
Monoblock conductively-coated dielectric filters offer several advantages over lumped component filters. The blocks are relatively easy to manufacture, rugged, and relatively compact. In the basic ceramic monoblock filter design, the resonators are formed by typically cylindrical passages, called through-holes, extending through the block from the long narrow side to the opposite long narrow side. The block is substantially plated with a conductive material (i.e. metallized) on all but one of its six (outer) sides and on the inside walls formed by the through-holes.
One of the two opposing sides containing through-hole openings is not fully metallized, but instead bears a metallization pattern designed to couple input and output signals through the series of resonators. This patterned side is conventionally labeled the top of the block, though the “top” designation may also be applied to the side opposite the surface mount contacts when referring to a filter in the board mounted orientation. In some designs, the pattern may extend to sides of the block, where input/output electrodes are formed.
In the Figures,
FIG. 1 is an enlarged perspective (or more precisely an isometric) view of a duplexing communication filter according to the invention;
FIG. 2 is an enlarged top surface view of the filter of FIG. 1;
While this invention is susceptible to embodiment in many different forms, this specification and the accompanying drawings disclose only preferred forms as examples of the invention. The invention is not intended to be limited to the embodiments so described, however. The scope of the invention is identified in the appended claims.
Referring to FIGS. 1 and 2, a duplexing communication filter 10 includes an elongate, parallelepiped (or “box-shaped”core of ceramic dielectric material 12 defining a series of through-hole passages 13 and a pattern of metallized and unmetallized areas 14. Core 12 has three sets of opposing side surfaces, a top 16 and a bottom 18, opposing long sides 20 and 22, and opposing narrow sides 24 and 36. Core 12 defines a series of through-hole passageways 13, which extend from an opening (or aperture) 28 on top side 16 to a bottom side (18) opening 30. Core 12 has approximate dimensions of about 21.3 by 9 by 4 millimeters (mm).
Pattern 14 includes an expansive, wide region of metallization 32 unmetallized regions 34, 35, 36 and 37, a transmitter metallized connection pad 38, a receiver metallized connection pad 40, and an antenna metallized connection pad 42.