Source: http://www.google.com/patents/US5898403?ie=ISO-8859-1&dq=7,603,356
Timestamp: 2014-07-28 17:05:17
Document Index: 414611277

Matched Legal Cases: ['art. 2', 'art 1', 'art 11', 'art 1', 'art 11', 'art 1', 'arts 1']

Patent US5898403 - Antenna formed of multiple dielectric substrates including shielded LC filter - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsAn antenna device has an antenna part and a filter part combined into a single unit. The antenna part has a radiating electrode formed on a surface of layered dielectric substrates and a grounding electrode formed inside the layered structure. The filter part is formed below the antenna part and includes...http://www.google.com/patents/US5898403?utm_source=gb-gplus-sharePatent US5898403 - Antenna formed of multiple dielectric substrates including shielded LC filterAdvanced Patent SearchPublication numberUS5898403 APublication typeGrantApplication numberUS 08/427,415Publication dateApr 27, 1999Filing dateApr 24, 1995Priority dateMay 20, 1994Fee statusLapsedPublication number08427415, 427415, US 5898403 A, US 5898403A, US-A-5898403, US5898403 A, US5898403AInventorsYasuaki Saitoh, Kazunari KawahataOriginal AssigneeMurata Manufacturing Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (3), Referenced by (30), Classifications (13), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetAntenna formed of multiple dielectric substrates including shielded LC filterUS 5898403 AAbstract An antenna device has an antenna part and a filter part combined into a single unit. The antenna part has a radiating electrode formed on a surface of layered dielectric substrates and a grounding electrode formed inside the layered structure. The filter part is formed below the antenna part and includes shield electrodes, capacitor electrodes and coil electrodes. A feed point on the antenna part and an input section of the filter part are electrically connected to each other through a roughhole, and external electrodes are formed on side surfaces of the multi-layered structure of the dielectric substrates, connecting the grounding electrode of the antenna part and the output section of the filter part. A slot electrode having a slot formed therethrough and a strip line extending perpendicularly to the slot may be inserted between the radiating electrode and the grounding electrode of the antenna part.
What is claimed is: 1. An antenna device comprising:a layered structure of dielectric substrates; an antenna part formed as a portion of said layered structure, said antenna part comprising a radiating electrode formed on a surface of said layered structure and a grounding electrode formed inside said layered structure; a filter part having an input section and an output section, said filter part being formed inside said layered structure and below said antenna part, and including a dielectric substrate having a pair of shield electrodes on one surface thereof, another dielectric substrate having a pair of capacitor electrodes on one surface thereof, and still another dielectric substrate having a pair of coil electrodes on one surface thereof, a feed point on said radiating electrode being electrically connected with said input section of said filter part through a throughhole formed through said layered structure; and external electrodes formed on side surfaces of said layered structure, said external electrodes connecting said grounding electrode and said output section of said filter part. 2. The antenna device of claim 1 wherein one of said shield electrodes and one of said external electrodes serve as said input section.
BACKGROUND OF THE INVENTION This invention relates to an antenna device which combines an antenna and a filter into a single unit.
SUMMARY OF THE INVENTION It is therefore an object of this invention to eliminate these problems associated with prior art antenna devices by providing an improved antenna device, which is compact, has a small reflection loss and costs less, having its antenna and filter parts formed as a single unit within a layered structure of dielectric substrates.
DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 1, an antenna device 30 according to a first embodiment of this invention is composed of a microstrip-type antenna part 1 and a LC-type filter part 11 in a layered formation and having external electrodes 21-28 formed on side surfaces. The antenna part 1 is formed with first through fourth rectangular dielectric substrates 2-5 piled one on top of another in a layered structure, having radiating electrode 2a on the upper surface and grounding electrodes (not shown) inside. The LC-type filter part 11 is attached below the antenna part 1 and is formed with fifth through eighth similarly shaped dielectric substrates 12-15 piled one on top of another in another layered structure, having electrodes (not shown) for forming coils and capacitors. The external electrodes 21-28 are formed on side surfaces of the combination of the antenna and filter parts 1 and 11 thus formed.
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