Amplifiers – Involving structure other than that of transformers per se – With shielding means
Patent
1993-11-12
1995-05-02
Mullins, James B.
Amplifiers
Involving structure other than that of transformers per se
With shielding means
361816, 455300, H03F 319
Patent
active
054123402
ABSTRACT:
The present invention provides a shield structure for shielding a microwave circuit device, which can establish a reliable electric contact between the ground wiring patterns of a circuit substrate, and can completely prevent external noise from entering into the circuit, with the use of a light and compact shield case. A circuit substrate has microwave components mounted thereon, ground patterns formed on peripheral portions of the upper surface of the substrate, and a ground pattern formed in the lower surface of the substrate along the entire periphery thereof. A shield case main body receiving the circuit substrate comprises a case main body, a top plate, and a bottom plate. The thickness of the case main body increases from a predetermined position such that it contacts the ground patterns. The bottom plate is coupled integral with the case main body with the circuit substrate interposed therebetween, in a state where the circuit substrate is received in the body. The shield case bottom plate has a surface, which is opposed to the lower surface of the circuit substrate and has a continuous groove formed therein along the periphery thereof. A shield line, which consists of an elastic conductor with a diameter greater than the depth of the groove, fills the continuous groove. The top plate is coupled integral with the upper surface of the shield case main body.
REFERENCES:
patent: 5095616 (1992-03-01), Veenendaal
patent: 5150282 (1992-09-01), Tomura et al.
patent: 5265273 (1993-11-01), Goodwin et al.
"Noise Reduction Techniques In Electronic Systems", Henry W. Ott, 1988, pp. 192-203.
Kabushiki Kaisha Toshiba
Mullins James B.
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