EP0398710A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Diversity receiving apparatus
Assignee: NEC Corp
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Filing: 1990-05-17
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Granted: —
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Expires: 2010-05-17
Abstract
Abstract A diversity receiving apparatus having a plurality of antennas, antenna feeders (3,4) each being associated with respective one of the antennas, and a single diversity receiving section to which the antennas are connected via the associated antenna feeders. A breakage detecting circuit (53) is included in the apparatus for detecting the breakage of any one of the antenna feeders. The detecting circuit uses an antenna whose radiation element is connected to ground and, by applying a predetermined DC potential to the hot line of the antenna feeder via a resistor, constantly monitors the potential. On the breakage of the antenna feeder, the detecting circuit produces an alarm in response to the resultant change in the potential. The apparatus is capable of readily detecting that the diversity reception effect has been lost and the receiving ability has been degraded due to the breakage of the antenna feeder.
Inventors
- 👤 Yukio C/O Nec Corporation Fukumura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 02:05
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0805; H04B7/0831
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
60 words
A diversity receiving apparatus comprising: a plurality of antennas for receiving radio frequency signals; a diversity receiving section for receiving the radio frequency signals coming in through said plurality of antennas; at least one antenna feeder connecting associated one of said plurality of antennas to said diversity receiving section; and detecting means for detecting breakage of said one antenna feeder.
Claim 2
Dependent Claim
60 words
A diversity receiving apparatus comprising: a plurality of antennas for receiving radio frequency signals; a diversity receiving section for receiving the radio frequency signals coming in through said plurality of antennas; at least one antenna feeder connecting associated one of said plurality of antennas to said diversity receiving section; and detecting means for detecting breakage of said one antenna feeder.
Claim 3
Dependent Claim
52 words
An apparatus as claimed in claim 1, wherein said one antenna comprises: a radiation element; and a signal blocking circuit connected at one end thereof to said radiation element and at the other end thereof to ground for choking the radio frequency signal and exhibiting a low resistance with respect to DC.
Claim 4
Dependent Claim
23 words
An apparatus as claimed in claim 2, wherein said signal blocking circuit comprises one of a choke coil and a distributed constant element.
Claim 5
Dependent Claim
101 words
An apparatus as claimed in claim 1, wherein said one antenna has a radiation element whose one end is connected to one end of said antenna feeder and a structure in which said radiation element is connected to ground directly or via said signal blocking circuit; and and wherein said detecting means comprises: a power source connected to the other end of said antenna feeder for applying a predetermined DC potential to said antenna feeder; and a detecting circuit connected to the other end of said antenna feeder for detecting a variation in a DC potential appearing on said other end.
Claim 6
Dependent Claim
23 words
An apparatus as claimed in claim 4, wherein said detecting circuit comprises a light emitting diode for reporting breakage of said antenna feeder.
Claim 7
Dependent Claim
118 words
A diversity receiving apparatus comprising: two antennas each having a radiation element; a choke coil connecting said two antennas to each other; a diversity receiving section; a first and second antenna feeders each being connected to one end of respective one of said two antennas; means for selectively connecting the other end of said first and second antenna feeders to said diversity receiving section with respect to DC; a power source connected to said other end of said first antenna feeder for applying a predetermined DC potential to said other end; and a detecting circuit connected to said other end of said second antenna feeder for detecting a variation in a DC potential appearing on said other end.
Claim 8
Dependent Claim
118 words
A diversity receiving apparatus comprising: two antennas each having a radiation element; a choke coil connecting said two antennas to each other; a diversity receiving section; a first and second antenna feeders each being connected to one end of respective one of said two antennas; means for selectively connecting the other end of said first and second antenna feeders to said diversity receiving section with respect to DC; a power source connected to said other end of said first antenna feeder for applying a predetermined DC potential to said other end; and a detecting circuit connected to said other end of said second antenna feeder for detecting a variation in a DC potential appearing on said other end.
Claim 9
Dependent Claim
23 words
An apparatus as claimed in claim 5, wherein said detecting circuit comprises a light emitting diode for reporting breakage of said antenna feeder.
Claim 10
Dependent Claim
87 words
A diversity reception apparatus comprising: first and second antenna means for picking up radio frequency signals; diversity receiver means responsive to said radio frequency signals picked up by said first and second antenna means for performing a diversity reception operation; first antenna feeder means for coupling said first antenna means to said diversity receiver means; voltage supply means for applying a DC voltage on said first antenna feeder means; and detecting means for detecting a change in said DC voltage applied on said first antenna feeder means.
Claim 11
Dependent Claim
87 words
A diversity reception apparatus comprising: first and second antenna means for picking up radio frequency signals; diversity receiver means responsive to said radio frequency signals picked up by said first and second antenna means for performing a diversity reception operation; first antenna feeder means for coupling said first antenna means to said diversity receiver means; voltage supply means for applying a DC voltage on said first antenna feeder means; and detecting means for detecting a change in said DC voltage applied on said first antenna feeder means.
Claim 12
Dependent Claim
64 words
An apparatus as claimed in claim 8, further comprising second antenna feeder means for coupling said second antenna means to said diversity receiver means, wherein said voltage supply means applies a DC voltage on both said first and second antenna feeder means, and wherein said detecting means detects a change in said DC voltage applied on either said first or second antenna feeder means.
Claim 13
Dependent Claim
36 words
An apparatus as claimed in claim 9, wherein said detecting means comprises first means for detecting said change to produce a detect signal; and alert means responsive to said detect signal for producing an alert signal.
Claim 14
Dependent Claim
22 words
An apparatus as claimed in claim 10, wherein said alert means comprises an LED for glowing in response to said detect signal.
Claim 15
Dependent Claim
25 words
An apparatus as claimed in claim 10, wherein said alert means comprises a beeper for generating an alert tone in response to said detect signal.
Claim 16
Independent Claim
102 words
An apparatus comprising: first and second antenna element means whose one ends are respectively coupled to ground, for picking up radio frequency signals; diversity receiver means responsive to radio frequency signals picked up by said first and second antenna element means for performing a diversity reception operation; first and second feeder means for connecting said first and second antenna element means to said diversity receiver means, respectively; voltage source means for applying a DC voltage on said first and second feeder means; and detecting means for detecting a change in said DC voltage applied on either said first or second feeder means.
Claim 17
Independent Claim
102 words
An apparatus comprising: first and second antenna element means whose one ends are respectively coupled to ground, for picking up radio frequency signals; diversity receiver means responsive to radio frequency signals picked up by said first and second antenna element means for performing a diversity reception operation; first and second feeder means for connecting said first and second antenna element means to said diversity receiver means, respectively; voltage source means for applying a DC voltage on said first and second feeder means; and detecting means for detecting a change in said DC voltage applied on either said first or second feeder means.
Claim 18
Dependent Claim
87 words
An apparatus as claimed in claim 13, wherein said detecting means comprises: first and second low-pass filter means whose inputs are coupled to one ends of said first and second feeder means, respectively; first and second inverter means whose inputs are coupled to the outputs of said first and second low-pass filter means, respectively; NAND gate means whose two inputs are coupled to the outputs of said first and second inverter means, respectively; and LED means coupled between the output of said NAND gate means and ground.
Claim 19
Dependent Claim
96 words
An apparatus as claimed in claim 13, wherein said detecting means comprises: first and second low-pass filter means whose inputs are coupled to one ends of said first and second feeder means, respectively; first and second inverter means whose inputs are coupled to the outputs of said first and second low-pass filter means, respectively; NAND gate means whose two inputs are coupled to the outputs of said first and sedond inverter means, respectively; and tone generator means for generating an alert tone in response to a status change in the output of said NAND gate means.
Claim 20
Independent Claim
132 words
An apparatus comprising: first and second antenna element means whose one ends are DC coupled to each other, for picking up radio frequency signals; diversity receiver means responsive to one of radio frequency signals picked up by said first and second antenna element means for performing a diversity reception operation; first and second feeder means for coupling said first and second antenna element means to said diversity receiver means, respectively; voltage source means for applying a DC voltage on one end of said first feeder means which is to be coupled to said diversity receiver means; and detecting means connected to one end of said second feeder means which is to be coupled to said diversity receiver means, for detecting a change in said DC voltage applied from said voltage source means.
Claim 21
Independent Claim
132 words
An apparatus comprising: first and second antenna element means whose one ends are DC coupled to each other, for picking up radio frequency signals; diversity receiver means responsive to one of radio frequency signals picked up by said first and second antenna element means for performing a diversity reception operation; first and second feeder means for coupling said first and second antenna element means to said diversity receiver means, respectively; voltage source means for applying a DC voltage on one end of said first feeder means which is to be coupled to said diversity receiver means; and detecting means connected to one end of said second feeder means which is to be coupled to said diversity receiver means, for detecting a change in said DC voltage applied from said voltage source means.
Claim 22
Dependent Claim
55 words
An apparatus as claimed in claim 16, wherein said detecting means comprises: low-pass filter means whose input is coupled to said one end of said second feeder means; inverter means whose input is coupled to the output of said low-pass filter means; and LED means connected between the output of said inverter means and ground.
Claim 23
Dependent Claim
50 words
An apparatus as claimed in claim 17, wherein said detecting means comprises: low-pass filter means whose input is coupled to said one end of said second feeder means; and alert means for generating an alert tone in response to a status change in the output of said low-pass filter means.
Claim 24
Independent Claim
84 words
A method of detecting breakage of an antenna feeder which feeds a radio frequency signal from a first antenna to a diversity receiver, said method comprising the following steps of: feeding a first radio frequency signal from said first antenna to said diversity receiver through said antenna feeder; feeding a second radio frequency signal from a second antenna to said diversity receiver; applying a DC voltage on said antenna feeder; and detecting a voltage change in said DC voltage to produce a detect signal.
Claim 25
Independent Claim
84 words
A method of detecting breakage of an antenna feeder which feeds a radio frequency signal from a first antenna to a diversity receiver, said method comprising the following steps of: feeding a first radio frequency signal from said first antenna to said diversity receiver through said antenna feeder; feeding a second radio frequency signal from a second antenna to said diversity receiver; applying a DC voltage on said antenna feeder; and detecting a voltage change in said DC voltage to produce a detect signal.
Claim 26
Dependent Claim
24 words
A method as claimed in claim 19, further comprising the step of, responsive to said detect signal, annunciating the failure of said antenna feeder.
Claim 27
Dependent Claim
25 words
A method as claimed in claim 20, wherein said annunciating step comprises the step of, responsive to said detect signal, causing an LED to glow.
Claim 28
Dependent Claim
29 words
A method as claimed in claim 20, wherein said annunciating step comprises the step of, responsive to said detect signal, causing a tone generator to generate an alert tone.
Claim 29
Dependent Claim
27 words
A method as claimed in claim 19, further comprising the step of selectively receiving one of said first and second radio frequency signals at said diversity receiver.
Claim 30
Dependent Claim
54 words
An apparatus as claimed in claim 8, wherein said diversity receiver means comprises: an antenna switch for selecting one of said radio frequency signals in response to a switch control signal; and a diversity receiver for receiving the selected radio frequency signal and producing said switch control signal based on said radio frequency signals.
References Cited (Backward Citations)
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