EP0518526B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Portable radio apparatus of foldable type
Assignee: NEC Corp
•
Filing: 1992-05-28
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Granted: 1995-08-23
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Expires: 2012-05-28
Abstract
No abstract record available.
Inventors
- 👤 Yoshiharu Tamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:13
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/18; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/243; H01Q1/244; H04M; H04M1/00; H04M1/02; H04M1/0202; H04M1/0206; H04M1/0208; H04M1/0214; H04M1/0241; H04M1/0245; H04M2250/00; H04M2250/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A portable radio apparatus having an antenna (20) and a foldable casing (10,40) accommodating therein a radio circuit (11), said apparatus comprising: variable matching means (12) for establishing a matching between said radio circuit (11) and said antenna (20); and sensing means (13a) for sensing a folded state of said casing, said variable matching means (12) altering the matching state between said radio circuit (11) and said antenna (20) depending on the sensing result of said sensing means (13a).
Claim 2
Dependent Claim
31 words
A portable radio apparatus as claimed in claim 1, wherein said sensing means (13a) comprises means for detecting whether or not said casing (10,40) is folded to produce said sensing result.
Claim 3
Dependent Claim
43 words
A portable radio apparatus as claimed in claim 1, wherein said casing includes an upper casing (10), a lower casing (40), and a hinge (30) rotatable linking said upper casing (10) with said lower casing (40), whereby said casing is foldable and unfoldable.
Claim 4
Dependent Claim
64 words
A portable radio apparatus as claimed in claim 3, wherein said sensing means (13a) comprises switching means (13) disposed in either one of said upper (10) and lower casings (40), said switching means (13) being depressed, when said casing (10,40) is folded, by the surface of the other of said upper and lower casings, thereby altering the impedance of said variable matching means (12).
Claim 5
Dependent Claim
28 words
A portable radio apparatus as claimed in claim 3, wherein said upper (10) and lower casings (40) accommodate an earpiece speaker (14) and a mouthpiece microphone (41) respectively.
Claim 6
Dependent Claim
55 words
A portable radio apparatus as claimed in claim 2 wherein said antenna (20) is accommodated in said casing; and said variable matching means (12) establishes, when said sensing means (13a) senses a state that said casing (10,40) is folded, the matching state based on a state in which said antenna is accommodated in said casing.
Claim 7
Dependent Claim
24 words
A portable radio apparatus as claimed in claim 4, wherein said variable matching means (12) includes a coil (L1;L2,L3), capacitors, (C1,C2,C3;C4,C5), and a switch.
Claim 8
Independent Claim
90 words
A method of impedance matching an antenna (20) of a portable radio apparatus and a radio circuit (11) of same, comprising the steps of: accommodating said radio circuit (11) into at least one of first and second casings (10,40) of said apparatus, said first and second casings being foldable and unfoldable; detecting the folded or unfolded state of said first and second casings; and responsive to the result of said detecting step, changing impedance between said antenna (20) and radio circuit (11) so that they impedance match with each other.
References Cited (Backward Citations)
No citation records indexed.
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