HIGH FREQUENCY COMMUNICATION EQUIPMENT - 株式会社日立製作所

Title:

HIGH FREQUENCY COMMUNICATION EQUIPMENT

Document Type and Number:

Japanese Patent JP3739230

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To reduce spurious electromagnetic coupling with devices inside and outside a housing of a communication equipment where circuit elements or the like of a transmission/reception circuit are mounted.
SOLUTION: A periodic structure 6 is attached to at least a part of housing walls of housing frames 1, 4 (4-1, 4-2), 5 and the housing frame including this periodic structure 6 is designed so as to act like a filter whose cut-off frequency band covers a frequency band including frequencies of a spurious radiation radio wave in question in the housing. The housing is structure to locally confine the radiation energy from a spurious radiation source so as to prevent interference on the other devices. Having only to add the simple periodic structure as above to the part of the housing locally confines the radiation energy of the spurious radiation radio wave in the housing to prevent the interference on other devices and to reduce the adverse effect of EMC(electromagnetic compliance) and EMI(electromagnetic interference) on the other devices. The tolerance for mass-production and changes over aging in the performance can be decreased and the manufacture cost is reduced without deteriorating a receiver of the communication equipment.

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Inventors:

Hiroshi Kondo
Hiroshi Shinoda
Kenji Sekine

Application Number:

JP11804799A

Publication Date:

January 25, 2006

Filing Date:

April 26, 1999

Export Citation:

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Assignee:

株式会社日立製作所

International Classes:

H01P1/20; H05K9/00; H01L23/552; H01P1/16; H01P1/211; H01P1/212; H01P3/08; H01P7/00; H01Q13/08; H04B1/38; H04B1/3822; (IPC1-7): H01P1/20; H01P1/212; H01P7/00; H01Q13/08; H04B1/38; H05K9/00

Domestic Patent References:

JP11004118A
JP8288684A
JP58034602A
JP11261283A
JP9246803A

Attorney, Agent or Firm:

Nitto International Patent Office
Katsuo Ogawa
Akio Takahashi
Kyosuke Tanaka

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