Patent EP1032073A2 successfully refreshed from Google Patents.
EP1032073A2
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EP
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Vehicle-mounted VHF diversity system
Assignee: Nippon Sheet Glass Co Ltd
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Filing: 2000-02-25
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Granted: —
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Expires: 2020-02-25
Abstract
Abstract A vehicle-mounted VHF diversity system includes two VHF antennas (2A, 2B) and a phased-array antenna signal generating section (4) for generating from signals (S3, S4) received by the two VHF antennas at least one phased-array antenna signal (S6, S8) having different characteristics of directivity from the antenna signals. A selector (5) selects, from among the signals and the phased-array antenna signal, one signal for feeding to a VHF tuner (9). A selection controller (8) controls the selector to select the signal having the highest level. With this arrangement, the vehicle-mounted VHF diversity system can produce with only two antennas the result as achieved by three or more antennas. With only two antennas being necessary, a small area is required for disposition or arrangement of the antennas, thereby increasing the freedom of antenna designing and enabling the selection of antenna disposition areas which are free from antenna interferences. <IMAGE>
Inventors
- 👤 Hitoshi c/o Nippon Sheet Glass Co. Ltd Kakizawa
- 👤 Hideaki c/o Nippon Sheet Glass Co. Ltd Oshima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 09:02
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/24; H01Q3/26; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0805; H04B7/0808
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
141 words
A vehicle-mounted VHF diversity system comprising: two VHF antennas (2A, 2B) disposed on a vehicle in
spaced relation to each other; phased-array antenna signal generating means (4; 4a; 4b;
4c) for generating from signals (S3, S4) received by said two
VHF antennas (2A, 2B) at least one phased-array antenna signal
(S6, S8, S13, S15) having different characteristics of
directivity from the signals (S3, S4) received by said two VHF
antennas (2A, 2B); selecting means (5) for selecting, from among the signals
(S3, S4) received by said two VHF antennas and the at least
one phased-array antenna signal (S6, S8, S13, S15) generated by
said phased-array antenna signal generating means (4, 4a, 4b,
4c), one signal for feeding to a VHF tuner (9); and selection control means (8) for controlling the selecting
means (5) to select the signal having the highest level.
Claim 2
Dependent Claim
81 words
The vehicle-mounted VHF diversity system of claim 1,
wherein said phased-array antenna signal generating means (4,
4a, 4b, 4c) is a phase-synthesizing means including at least one
phase shifter (31-34) for shifting in a predetermined phase
shift amount the phase of the signal received by either of the
two VHF antennas (2A, 2B), and a synthesizer (41-44) for synthesizing
a signal outputted from said phase shifter (31-34) with
the signal received by the other one of said VHF antennas (2A,
2B).
Claim 3
Dependent Claim
81 words
The vehicle-mounted VHF diversity system of claim
1, wherein said phased-array antenna signal generating means (4,
4a, 4b, 4c) is a phase-synthesizing means including a plurality
of phase shifters (31-34) for shifting in different phase shift
amounts the phase of the signal received by either of the two
VHF antennas (2A, 2B), and a plurality of synthesizers (41-44)
for synthesizing signals outputted from said phase shifters (31-34)
with the signal received by the other one of said VHF
antennas (2A, 2B).
Claim 4
Dependent Claim
28 words
The vehicle-mounted VHF diversity system of claim 2,
wherein said phase-synthesizing means (4c) phase-synthesizes at
a fixed phase the signals received by said two VHF antennas (2A,
2B).
Claim 5
Dependent Claim
21 words
The vehicle-mounted VHF diversity system of claim 4,
wherein said phase-synthesizing means (4c) phase-synthesizes the
received signals at the same phase.
Claim 6
Dependent Claim
21 words
The vehicle-mounted VHF diversity system of claim 4,
wherein said phase-synthesizing means (4c) phase-synthesizes the
received signals at the opposite phase.
Claim 7
Dependent Claim
37 words
The vehicle-mounted VHF diversity system of claim 4,
wherein said phase-synthesizing means (4c) has two said phase
shifters and two said synthesizers and phase-synthesizes the
received signals at both of the same phase and the opposite
phase.
Claim 8
Dependent Claim
59 words
The vehicle-mounted VHF diversity system of claim 1,
wherein said two VHF antennas (2A, 2B) receive two signals
having directional characteristics in opposing directions of the
vehicle and said phased-array antenna signal generating means
(4, 4a, 4b, 4c) generates at least one phased-array antenna
signal having a directional characteristic orthogonal to the
directional characteristics of the two received signals.
Claim 9
Dependent Claim
41 words
The vehicle-mounted VHF diversity system of claim 1,
further including two amplifying means (3A, 3B) disposed immediately
following said VHF antennas (2A, 2B) for performing
impedance matching on and amplifying the signals (S1, S2)
received by said VHF antennas (2A, 2B).
Claim 10
Dependent Claim
45 words
The vehicle-mounted VHF diversity system of claim
1, further comprising an additional signal selecting means (5A)
arranged in parallel to said signal selecting means (5) and
operable under the control of said selection control means (8)
for allowing connection to an additional VHF tuner (91).
References Cited (Backward Citations)
No citation records indexed.
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