Abstract:
A wiring board provided with a passive element, comprising: an insulating board (5) having a first surface and a second surface; a layered dielectrics (26) disposed on the second surface of the insulating board, the layered dielectrics sinking in a thickness direction of the insulating board to be positioned at a first sinking level; a layered electrical conductor (36) disposed under the layered dielectrics to be in contact with the layered dielectrics and to be positioned at a second sinking level under the first sinking level of the insulating board and also disposed to be positioned at a same sinking level as the first sinking level of the insulating board; and a wiring layer (1a) disposed on the second surface of the insulating board and having a first contacting portion with the layered dielectrics and a second contacting portion with the layered electrical conductor, characterized in that the wiring board further comprises: a second layered dielectrics (27) disposed under the layered electrical conductor to be in contact with the layered electrical conductor and to be positioned at a third sinking level under the second sinking level of the insulating board and also disposed to be positioned at same sinking levels as the second and the first sinking levels of the insulating board to be in contact with the layered dielectrics; and a second layered electrical conductor (38) disposed under the second layered dielectrics to be in contact with the second layered dielectrics and to be positioned at a fourth sinking level under the third sinking level of the insulating board and also disposed to be positioned at same sinking levels as the third, the second, and the first sinking levels of the insulating board to be in contact with the wiring layer electrically conducting with the first contacting portion.
Abstract:
The invention relates to a method for producing a radar sensor (10) which is suitable particularly for producing highly integrated and nevertheless highly sensitive radar sensors. The radar sensor (10) has a plurality of antennas (18, 20) which can be driven differently and a distribution network (14) for driving the antennas (18, 20). The method according to the invention comprises the steps of: a) providing a ceramic support structure with the distribution network (14), in which support structure cavities are formed, b) filling the cavities with a material matrix comprising a first material with inclusions of a second material in order to form, within the material matrix, a large number of regions which have a lower dielectric constant than the first material, c) applying planar antenna patches to the material matrix.
Abstract:
A wiring board 19 is structured by connecting a first wiring board 17 and a second wiring board 16 with a pliable member 15. The first wiring board 17 is structured by laminating a first substrate 1, a non-pliable second substrate 2 having a smaller mounting area than that of the first substrate 1, and a base substrate 3 formed between the first substrate 1 and the second substrate 2, where at least a portion of the periphery is formed thinner than the central portion. Vias 44 are formed at least either in the first substrate 1 or the second substrate 2.
Abstract:
A wiring board 19 is structured by laminating first substrate 1, second substrate 2 having a smaller mounting area than that of first substrate 1, and base substrate 3 formed between first substrate 1 and second substrate 2. The thickness of at least a portion of the periphery is made less than that of the central portion. Base substrate 3 is formed with resin containing inorganic filler, and first substrate 1 and second substrate 2 are formed with pliable resin. Vias 44 are formed in the first substrate 1 and the second substrate 2. An interlayer groove section 11 is formed between the first substrate 1 and the second substrate 2. In the interlayer groove section 11, gas or the like is filled.
Abstract:
Compositions comprising: an epoxy containing cyclic olefin resin with a water absorption of 2% or less; one or more phenolic resins with water absorption of less than 2% or less; an epoxy catalyst; optionally one or more of an electrically insulated filler, a defoamer and a colorant and one or more organic solvents. The compositions are useful as encapsulants and have a cure temperature of 190°C or less.
Abstract:
Wiring board 19 is structured with first substrate 1, second substrate 2 having a smaller mounting area than that of first substrate 1, and base substrate 3 formed between first substrate 1 and second substrate 2. Also, wiring board 19 has vias 44 formed in at least either first substrate 1 or second substrate 2. In addition, wiring board 19 comprises interlayer groove portion 11 between first substrate 1 and second substrate 2. Interlayer groove portion 11 may be filled with at least one of gas, liquid, or solid material.
Abstract:
A chip capacitor 20 is provided in a core substrate 30 of a printed circuit board 10. This makes it possible to shorten a distance between an IC chip 90 and the chip capacitor 20 and to reduce loop inductance. Since the core substrate 30 is constituted by providing a first resin substrate 30a, a second resin substrate 30b and a thi rd res in substrate 30c in a multilayer manner, the core substrate 30 can obtain sufficient strength.
Abstract:
A thin-film metal resistor (44) suitable for a multilayer printed circuit board (12), and a method for its fabrication. The resistor (44) generally has a multilayer construction, with the individual layers (34, 38) of the resistor (44) being self-aligned with each other so that a negative mutual inductance is produced that very nearly cancels out the self-inductance of each resistor layer (34, 38). As a result, the resistor (44) has a very low net parasitic inductance. In addition, the multilayer construction of the resistor (44) reduces the area of the circuit board (12) required to accommodate the resistor (44), and as a result reduces the problem of parasitic interactions with other circuit elements on other layers of the circuit board (12).