EP0872912A2
Expired / Lapsed
EP
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Circular-polarization antenna
Assignee: Murata Manufacturing Co Ltd
•
Filing: 1998-04-16
•
Granted: —
•
Expires: 2018-04-16
Abstract
Abstract The invention provides a low-profile circular-polarization antenna (1) that can be implemented at a reduced mounting cost of components. Two linear-polarization surface-mount antennas (3, 4) are mounted on a mounting substrate (2) such that their planes of polarization are perpendicular to each other in the direction normal to the mounting surface, and an amplification circuit, a shield case (5) for covering the circuit, and a phase circuit (6) for sending signals having the same amplitude and a phase difference of 90 degrees to the two surface-mount antennas (3, 4) are provided on the same mounting surface.
Inventors
- 👤 Yuichi c/o Murata Manufacturing Co. Ltd Kushihi
- 👤 Masaru c/o Murata Manufacturing Co. Ltd Shikata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:11
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/36; H01Q1/38; H01Q21/00; H01Q21/24; H05; H05K; H05K1/00; H05K1/18; H05K1/181; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/341; H05K3/3431; H05K3/3442
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
A circular-polarization antenna (1; 9; 15; 40; 50; 60;
70; 80) comprising: a mounting substrate (2); a pair of linear-polarization surface-mount antennas (3,
4; 3x, 4x; 20, 30) mounted on said mounting substrate
each having a plane of polarization, the surface-mount
antennas disposed such that the respective planes of
polarization in a direction normal to the mounting
surface of said mounting substrate are substantially
perpendicular to each other; a phase circuit (6) connected to said pair of
linear-polarization surface-mount antennas for at least
one of sending thereto and receiving therefrom signals
having the same amplitude and a phase difference of 90
degrees to each other; an amplification circuit connected to said phase circuit
(6); a shield case (5) covering said amplification circuit;
and said pair of linear-polarization surface-mount
antennas (3, 4; 3x, 4x; 20, 30), said phase circuit (6),
said amplification circuit and said shield case (5)
being mounted on the same mounting surface of said
mounting substrate (2).
Claim 2
Dependent Claim
32 words
The circular-polarization antenna of Claim 1, further
comprising a radome (8) covering said surface-mount
antennas (3, 4; 20, 30), said phase circuit (6), said
shield case (5) and said mounting substrate (2).
Claim 3
Dependent Claim
73 words
The circular-polarization antenna of Claim 1 or 2
wherein each of the surface-mount antennas (3, 4; 20,
30) has at least a power-feeding electrode (13; 24; 32),
an emission electrode (12; 23; 34) and a ground
electrode (11; 22; 33) provided on at least one of a
surface of and inside of a substantially
parallelopiped-rectangular base member (10; 21; 31) made
of at least one of a dielectric material and a magnetic
material.
Claim 4
Dependent Claim
96 words
The circular-polarization antenna of Claim 3, wherein
each of said surface-mount antennas (3, 4) is formed
such that said ground electrode (11) is provided
substantially on a first major surface of said base
member (10), said emission electrode (12) is formed
substantially on a second major surface of the base
member (10) with one end serving as an open and the
other end serving as a ground end connected to said
ground electrode (11), and one end of said power-feeding
electrode (13) is formed in the vicinity of the open end
of said emission electrode (12).
Claim 5
Dependent Claim
54 words
The circular-polarization antenna of Claim 4, wherein
the other end of said emission electrode (12) of each of
the surface-mount antennas (3, 4) is divided into a
plurality of ends, and the ends are connected to the
ground electrode (11) through different end faces of
said base member (10) and serve as ground ends.
Claim 6
Dependent Claim
31 words
The circular-polarization antenna of Claim 4 or 5,
wherein said pair of surface-mount antennas (3, 4) are
disposed such that the respective ground ends thereof
are farthest away from each other.
Claim 7
Dependent Claim
58 words
The circular-polarization antenna of any of the Claims 4
to 6, wherein the open end of said emission electrode
(12) in each of said surface-mount antennas (3, 4) is
formed inward from an end of the second major surface
of said base member (10) at a predetermined distance on
the second major surface of the base member (10).
Claim 8
Dependent Claim
22 words
The circular-polarization antenna (15) of Claim 1,
further comprising a shield plate (16) provided between
said pair of surface-mount antennas (3, 4).
Claim 9
Dependent Claim
49 words
The circular-polarization antenna of any of the
preceding claims, wherein said phase circuit (6)
comprises at least one of a capacitive element and an
inductive (6a, 6b; 41a, 41b; 51a, 51b; 61a, 61b; 71a,
71b) element connected to said pair of surface-mount
antennas (3, 4; 3x, 4x; 20, 30).
Claim 10
Dependent Claim
41 words
A radio apparatus (110), comprising: a circular-polarization antenna (1; 9; 15; 40; 50; 60;
70; 80) of any one of Claims 1 to 9; and a receiving section (112) and a signal-processing
section (113) connected in series to said circular-polarization
antenna.
Claim 11
Independent Claim
70 words
A method of at least one of transmitting and receiving
radio signals, comprising the steps of: providing a circular-polarization antenna, of any one of
the Claims 1 to 9; connecting the circular-polarization antenna to a radio
apparatus; and at least one of: receiving radio signals with the antenna and providing
them to the radio apparatus; and transmitting radio signals from the antenna provided to
the antenna from the radio apparatus.
References Cited (Backward Citations)
No citation records indexed.
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