Patent EP0635898A1 successfully refreshed from Google Patents.
EP0635898A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Extra antenna element
Assignee: Ericsson Inc
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Filing: 1994-07-04
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Granted: —
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Expires: 2014-07-04
Abstract
Abstract The present invention relates to a method and an arrangement using an extra member (10) intended to be connected to the ordinary grounding plane system of an antenna (1) through a portion a the coaxial input terminal (4) sleeve (6) being present outside the case (2) of an apparatus. The extra member (10) is tuned in such a way that it preferably operates as an electrical quarter-wave radiator in a range at the upper limit of a designed operating frequency range, while the remaining effective grounding plane system of the antenna is preferably tuned to a frequency in a range at the lower limit of the intended operating frequency range, where, for instance, a portable radio telephone should operate, to in this way obtain an increased bandwidth and a reduced influence of immediate surrounding environment of the antenna of the portable equipment.
Inventors
- 👤 Jan Cassel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:38
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/36; H01Q1/362; H01Q5/00; H01Q5/20; H01Q5/25; H01Q5/30; H01Q5/378
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
84 words
A method for improving efficiency and bandwidth of an antenna (1) at a portable equipment comprising a radio transceiver, e.g., in the shape of a pocket telephone, characterized in that the impedance and electromagnetic radiation field is influenced by the introduction of an extra conical helix shaped member (10) connected to the antenna grounding plane system, whereby is obtained a decreased influence of the antenna operation and its radiation field due to that a user is holding said portable equipment provided with said antenna.
Claim 2
Dependent Claim
136 words
The method according to claim 1, characterized in that the extra member (10) is resonantly tuned to a frequency within the operating frequency range of the radio station/pocket telephone, the resonance frequency of said member for instance is set near to the upper limiting frequency of the operating frequency range, while the rest of the antenna grounding plane system is resonantly tuned to a lower frequency within the frequency range in which said portable equipment is supposed to operate, whereby is obtained an increased bandwidth of the antenna system which is aimed at because the frequency limits of the antenna system impedance matching may be displaced by the influence of the adjacent external environment, said influence being strongly reduced by said extra member (10) and a scope for said influence being founded at the same time.
Claim 3
Dependent Claim
119 words
The method according to claim 1, characterized in that the extra member (10) is made as a coaxial screw shaped open coiled line or a helix at a lower end of said antenna (1) and being connected to a screen (6) at the antenna coaxial input terminal (4), the inductance of said extra member in cooperation with present stray capacitances forming a resonance frequency corresponding to a quarter-wave element within the operating frequency range and whereby the electromagnetic field is concentrated to the area between the antenna element and its adjacent counterpart, said extra member (10), and to the remaining grounding plane system connected to this, the energy transfer to remaining parts of the portable equipment will be reduced.
Claim 4
Dependent Claim
111 words
The method according to claim 1, characterized in that said extra member (10) is made as a coaxial conical helix at a lower end of said antenna (1) and being connected to a screen (6) at the antenna coaxial input terminal (4), said extra member inductance in cooperation with present stray capacitances forming a resonance frequency corresponding to a quarter element within the operating frequency range and whereby the electromagnetic field is concentrated to the area between the antenna element and its adjacent counterpart, the extra member (10), and to the remaining grounding plane system connected to that, the energy transfer to remaining parts of the portable equipment will be reduced.
Claim 5
Dependent Claim
166 words
An arrangement at an antenna element (1) onto an apparatus in form of a portable equipment comprising a radio transceiver, e.g., in the shape of a pocket telephone, said antenna element having a coaxial input terminal (4) with a sleeve (6) and a central pin (7) and forming a radiator which electrically for example forms a quarter-wave element for the operating frequency range and integrated with an apparatus case (2) there is a grounding plane cooperating with said radiator, characterized in that onto the portion of said coaxial input terminal (4) sleeve (6) being outside said apparatus case (2) is arranged an extra member (10) formed as a coaxial screw shaped line or a helix having a cylindrical shape, that said extra member (10) additionally forms a portion of the operative grounding plane of said antenna, that said extra member (10) operates as a resonance circuit, meaning that said member should be tuned to an appropriate frequency in association with the antenna (1) operating frequency range.
Claim 6
Dependent Claim
165 words
An arrangement at an antenna element (1) onto an apparatus in form of a portable equipment comprising a radio transceiver, e.g., in the shape of a pocket telephone, said antenna element having a coaxial input terminal (4) with a sleeve (6) and a central pin (7) forming a radiator which electrically for example forms a quarter-wave element for the operating frequency range and integrated with an apparatus case (2) there is a grounding plane cooperating with said radiator, characterized in that onto the portion of said coaxial input terminal (4) sleeve (6) being outside said apparatus case (2) is arranged an extra member (10) formed as a coaxial screw shaped line or helix having a conic shape, that said extra member (10) additionally forms a portion of the operative grounding plane of said antenna element, that said extra member (10) operates as a resonance circuit, meaning that said member should be tuned to an appropriate frequency in association with the antenna (1) operating frequency range.
Claim 7
Dependent Claim
78 words
The arrangement according to any of claims 5 or 6, characterized in that said antenna (1) is a compact half-wave antenna, which due to a top loop (1a) attains a rectangular current distribution, that said extra member (10) is a coaxial outward open helix having a maximum diameter approximately corresponding to the top loop diameter, said arrangement being embedded in an electrically non-conducting material to form an antenna device having the shape of a fustrum of a cone.
Claim 8
Dependent Claim
91 words
The arrangement according to any of claims 5, 6 or 7, characterized in that said extra member (10) is tuned to be resonant preferably near to the upper limiting frequency of a concerned operating frequency range, the rest of said antenna operating grounding plane being preferably tuned to a frequency at the lower limiting frequency of the intended operating frequency range where the portable pocket telephone should operate to thereby further obtain an increased bandwidth and a reduced influence of the immediate surrounding environment for the antenna of the portable equipment.
Claim 9
Dependent Claim
107 words
The arrangement according to any of claims 5, 6 or 7, characterized in that said extra member (10) is tuned in such a manner that it operates as an electric quarter-wave radiator within the range adjacent to the upper limit of an intended operation frequency range, while the rest of said antenna operating grounding plane being tuned to a frequency at or within an adjacent range at the lower limiting frequency of the intended operating frequency range where the portable pocket telephone should operate to thereby further obtain an increased bandwidth and a reduced influence of the immediate surrounding environment for the antenna of the portable equipment.
Claim 10
Dependent Claim
143 words
An antenna device onto a portable equipment comprising a radio transceiver, e.g., in the shape of a pocket telephone, whereby an antenna element (1) is in the shape of an embedded radiator having an essentially rectangular current distribution between a base and a top, and additionally is having a grounding plane cooperating with said antenna element, characterized in that said antenna device is intended to operate at least within the range 825 - 970 MHz, below at the radiator said device is provided with an extra member (10) connected to the cooperating grounding plane, said extra member having a shape of an open helix comprising preferably four turns and preferably having a maximum diameter of 8 mm and a height of 7 mm and the total embedded antenna device forming a fustrum of a cone having a height of the order 31 mm.
References Cited (Backward Citations)
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