EP0516485A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Radio pager
Assignee: NEC Corp
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Filing: 1992-06-01
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Granted: —
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Expires: 2012-06-01
Abstract
Abstract A radio pager for receiving a paging signal with a half-size microstrip antenna has a pair of electrical conductive elements (106,110) which sandwich a printed circuit board (107) on which elements (108) constituting pager circuitry are mounted. The conductive elements with conductive connecting pins (103,104) fastening them constitute an electromagnetic shield case for the circuitry elements, reducing the radiation of unnecessary electromagnetic waves to the outside from the circuitry mounted on the printed circuit board, particularly a local oscillation circuit. Since the antenna (1) has an earth plate (16) thereof connected to one (106) of the conductive plates with respect to high frequency, the conductive plate plays the role of an earth plate at the same time. As a result, a microstrip base plate is miniaturized while the space available for parts is increased. A ground conductive portion (14) surrounds the antenna element and conceals screws and other conductive structural parts, whereby the antenna directivity pattern is not susceptible to changes in the dimension and position of the conductive structural parts. The conductor of the antenna elment may be formed with slits (55 ; FIG. 6) to further miniaturize the antenna element and, therefore, the entire pager.
Inventors
- 👤 Masahiro C/O Nec Corporation Matai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:24
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H04; H04B; H04B1/00; H04B1/06; H04B1/08; H04B1/086; H01Q1/241; H01Q1/242; H01Q1/243
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
149 words
A radio apparatus comprising: a microstrip antenna comprising an antenna element constituted by a first conductive film formed on one of opposite major surfaces of a flat dielectric base plate, an earth plate constituted by a second conductive thin film formed on the other major surface of said dielectric base plate, and short-circuit means connecting one end of said antenna element and said earth plate, said microstrip antenna producing a received signal in response to a electromagnetic wave; a radio circuit means for converting said received signal to modulated signal; a printed circuit board mechanically supporting part of a radio circuit receiving said received signal; a shield member electromagnetically covering said printed circuit board to prevent unnecessary electromagnetic waves from leaking from said printed circuit board; and antenna supporting means connecting said earth plate to part of an outer surface of said shield member with respect to high frequency.
Claim 2
Dependent Claim
149 words
A radio apparatus comprising: a microstrip antenna comprising an antenna element constituted by a first conductive film formed on one of opposite major surfaces of a flat dielectric base plate, an earth plate constituted by a second conductive thin film formed on the other major surface of said dielectric base plate, and short-circuit means connecting one end of said antenna element and said earth plate, said microstrip antenna producing a received signal in response to a electromagnetic wave; a radio circuit means for converting said received signal to modulated signal; a printed circuit board mechanically supporting part of a radio circuit receiving said received signal; a shield member electromagnetically covering said printed circuit board to prevent unnecessary electromagnetic waves from leaking from said printed circuit board; and antenna supporting means connecting said earth plate to part of an outer surface of said shield member with respect to high frequency.
Claim 3
Dependent Claim
83 words
A radio apparatus as claimed in claim 1, wherein said radio circuit means comprising a local oscillator for generating a local oscillation signal and means for converting said received signal to a digital signal by said local oscillation signal; and said radio apparatus further comprising call control means for alerting a user of said radio pager to reception of a call on determining that a call signal included in the digital signal is identical with an address number assigned to said radio pager.
Claim 4
Dependent Claim
110 words
A radio apparatus as claimed in claim 2, wherein said microstrip antenna comprises a half-size microstrip antenna formed by selectively removing thin conductors formed on both surfaces of said flat dielectric base plate by etching and by constituting said short-circuit means by through holes; said antenna element comprising one of said conductors formed on one surface of said dielectric base plate; said earth plate comprising the other conductor formed on and over substantially the entire area of the other surface of said dielectric base plate; said short-circuit means comprising a plurality of first through hole means connecting one side of a quadrangle of said antenna element and said earth plate.
Claim 5
Dependent Claim
49 words
A radio apparatus as claimed in claim 3, wherein said microstrip antenna comprises: a side conductive film formed on said one surface of said dielectric base plate outside of said antenna element; and a plurality of second through hole means connecting said side conductive film and said earth plate.
Claim 6
Dependent Claim
35 words
A radio apparatus as claimed in claim 3, wherein said antenna element comprises a pair of slits located in the vicinity of said short-circuit means and extending in the same direction as said short-circuit means.
Claim 7
Dependent Claim
28 words
A radio apparatus as claimed in claim 3, wherein said shield member including a connecting surface of said earth plate has a greater area than said earth plate.
Claim 8
Dependent Claim
31 words
A radio apparatus as claimed in claim 6, wherein said shield member is bent in a crank configuration, said earth plate being accommodated in a recessed portion of said crank configuration.
Claim 9
Dependent Claim
171 words
A radio pager comprising: a microstrip antenna comprising an antenna element, an earth plate, and short-circuit means connecting one end of said antenna element and said earth plate, said microstrip antenna producing a received signal from a paging signal; radio circuit means including an oscillator for converting the received signal into a digital signal; call control means for alerting a user of said radio pager to reception of a call on determining that a call signal included in said digital signal is identical with an address number assigned to said radio pager; a printed circuit board mechanically supporting part of radio circuitry including said local oscillator; a pair of conductive plates located on both sides of said printed circuit board; connecting means electrically connecting said pair of conductive plates in peripheral portions of said conductive plates while spacing apart said conductive plates by a predetermined distance; and antenna supporting means connecting said earth plate to an outer surface of one of said conductive plates mechanically and with respect to high frequency.
Claim 10
Dependent Claim
171 words
A radio pager comprising: a microstrip antenna comprising an antenna element, an earth plate, and short-circuit means connecting one end of said antenna element and said earth plate, said microstrip antenna producing a received signal from a paging signal; radio circuit means including an oscillator for converting the received signal into a digital signal; call control means for alerting a user of said radio pager to reception of a call on determining that a call signal included in said digital signal is identical with an address number assigned to said radio pager; a printed circuit board mechanically supporting part of radio circuitry including said local oscillator; a pair of conductive plates located on both sides of said printed circuit board; connecting means electrically connecting said pair of conductive plates in peripheral portions of said conductive plates while spacing apart said conductive plates by a predetermined distance; and antenna supporting means connecting said earth plate to an outer surface of one of said conductive plates mechanically and with respect to high frequency.
Claim 11
Dependent Claim
111 words
A radio pager as claimed in claim 8, wherein said microstrip antenna comprises a half-size microstrip antenna formed by selectively removing thin conductors formed on both surfaces of said flat d i-electric base plate by etching and by constituting said short-circuit means by through holes; said antenna element comprising one of said conductors formed on one surface of said dielectric base plate; said earth plate comprising the other conductor formed on and over substantially the entire area of the other surface of said dielectric base plate; said short-circuit means comprising a plurality of first through hole means connecting one side of a quadrangle of said antenna element and said earth plate.
Claim 12
Dependent Claim
50 words
A radio pager as claimed in claim 9, wherein said microstrip antenna further comprises: a side conductive film formed on said one surface of said dielectric base plate outside of said antenna element; and a plurality of second through hole means connecting said side conductive film and said earth plate.
Claim 13
Dependent Claim
26 words
A radio pager as claimed in claim 10, wherein said connecting means is located further outside of at least part of said second through hole means.
Claim 14
Dependent Claim
25 words
A radio pager as claimed in claim 8, wherein said conductive plate connected to said earth plate has a greater area than said earth plate.
Claim 15
Dependent Claim
25 words
A radio pager as claimed in claim 9, wherein said conductive plate connected to said earth plate has a greater area than said earth plate.
Claim 16
Dependent Claim
35 words
A radio pager as claimed in claim 13, wherein said conductive plate connected to said earth plate has a crank-like bent portion, said earth plate being accommodated in a recessed portion of said bent portion.
Claim 17
Dependent Claim
27 words
A radio pager as claimed in claim 9, wherein said conductive film of said antenna element has slits extending in the same direction as said antenna element.
Claim 18
Dependent Claim
30 words
A radio pager as claimed in claim 8, wherein said antenna supporting means comprises a thermal adhesion tape intervening between said earth plate and one surface of said conductive plate.
Claim 19
Dependent Claim
82 words
A radio pager as claimed in claim 9, wherein said microstrip antenna further comprises: land means insulated from said thin conductive film formed on the other surface of said dielectric base plate; and third through hole means connecting said antenna element and said land means; said printed circuit board comprising at least an input terminal of said radio frequency circuit means; said radio pager further comprising solder means connecting said land means and said input terminal of said radio frequency circuit means.
Claim 20
Dependent Claim
37 words
A radio pager as claimed in claim 14, furthercom- prising battery package means for feeding said pager circuitry; said battery package means being disposed between a projected portion of said bent portion and the other conductive plate.
References Cited (Backward Citations)
No citation records indexed.
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