Title:
PORTABLE RADIO EQUIPMENT
Document Type and Number:
Japanese Patent JP3123363
Kind Code:
B2
Abstract:
PURPOSE: To make an antenna small by laminating a sheet insulation member with a conductor coated thereto to spirally form the conductor in succession thereby using the winding for an inductor element without deviation of the resonance frequency due to a surrounding material.
CONSTITUTION: A resin case 1 covers a metallic case 2 and the metallic case 2 incorporates a radio circuit section 3 to apply electromagnetic shielding to the radio circuit section 3. A connection terminal 5 to feed an antenna is connected to an output terminal of the radio circuit section 3, the connection terminal 5 is led to the outside of the metallic case 2 in a state that no electromagnetic shielding is interfered and connects electrically to an inductor element 7 whose electric length is nearly λ/4. The inductor element 7 is formed by forming a ferrite material into a green sheet with low dielectric constant and low loss, making a via-hole to the sheet, printing a conductor whose resistance is low to the sheet and laminating and integrating the sheet to allow the conductor to be a continuous winding and baking the sheet. The small sized inductor element is mass-produced and the performance is kept stable.
Inventors:
Yasuhito Imanishi
Eriko Komori
Eriko Komori
Application Number:
JP24012294A
Publication Date:
January 09, 2001
Filing Date:
October 04, 1994
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H01Q1/22; H01Q1/24; H01Q1/27; H01Q1/36; H01Q1/38; H01Q1/52; H01Q9/16; H01Q9/30; H01Q11/08; H04B1/38; H04W88/02; (IPC1-7): H01Q1/24; H04B1/38
Domestic Patent References:
| JP6268547A | ||||
| JP5599843A | ||||
| JP60103943U |
Attorney, Agent or Firm:
Kaneo Miyata (1 person outside)
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