1. A signal splitter, comprising
an input port;
first, second, third, and fourth output ports;
a first transformer having an input connected to the input port, and having first and second intermediate outputs, a first signal path from the input to the first intermediate output including a portion passing through a first ferrite tube, and a second signal path from the input to the second intermediate output including a portion passing through a second ferrite tube;
a second transformer having an input coupled to the first intermediate output of the first transformer, and having first and second outputs;
a third transformer having an input coupled to the second intermediate output of the first transformer, and having first and second outputs;
a first Wilkinson device having first and second inputs coupled to the first and second outputs of the second transformer, and having first and second outputs coupled to the first and second output ports of the signal splitter; and
a second Wilkinson device having first and second inputs coupled to the first and second outputs of the third transformer, and having first and second outputs coupled to the third and fourth output ports of the signal splitter.
2. The signal splitter of claim 1, wherein the first transformer comprises:
the first ferrite tube;
a first coax line passing through the first ferrite tube;
the second ferrite tube;
a second coax line passing through the second ferrite tube;
a third coax line passing along an outside of the first ferrite tube; and
a fourth coax line passing along an outside of the second ferrite tube.
3. The signal splitter of claim 2, further comprising a printed circuit board having a first side and a second side, wherein the printed circuit board includes first and second holes passing therethrough, wherein the first and second ferrite tubes each extend partially through a corresponding one of the first and second holes of the printed circuit board, wherein the first and second coax lines are disposed on the first side of the printed circuit board, and wherein the third and fourth coax lines are disposed on the second side of the printed circuit board.
4. The signal splitter of claim 2, wherein the first transformer further comprises a balance resistor; and wherein:
the first coax line has an inner conductor and an outer conductor, the inner conductor of the first coax line having a first end connected to the input port and having a second end connected to the first intermediate output, and the outer conductor of the first coax line having a first end connected to a first side of the balance resistor and having a second end connected to ground;
the second coax line having an inner conductor and an outer conductor, the inner conductor of the second coax line having a first end connected to the input port and having a second end connected to the second intermediate output, and the outer conductor of the second coax line having a first end connected to a second side of the balance resistor and having a second end connected to ground;
the third coax line having an inner conductor and an outer conductor, the inner conductor of the third coax line having a first end connected to the second side of the balance resistor and a second end connected to the first intermediate output, and the outer conductor of the third coax line having a first end and a second end both connected to ground; and
the fourth coax line having an inner conductor and an outer conductor, the inner conductor of the fourth coax line having a first end connected to the first side of the balance resistor and a second end connected to the second intermediate output, and the outer conductor of the fourth coax line having a first end and a second end both connected to ground.
5. The signal splitter of claim 4, wherein each of the second and third transformers comprises:
a ferrite core;
a first wire passing through the ferrite core, the first wire having a first end connected to the input of the transformer and having a second end connected to the first output of the transformer;
a second wire passing through the ferrite core, the second wire having a first end connected to the input of the transformer and having a second end connected to the second output of the transformer; and
one selected from: (1) a resistor; and (2) a series combination of a resistor and a capacitor, connected between the first and second outputs of the transformer.
6. The signal splitter of claim 1, wherein each of the second and third transformers comprises:
a ferrite core;
a first wire passing through the ferrite core, the first wire having a first end connected to the input of the transformer and having a second end connected to the first output of the transformer; and
a second wire passing through the ferrite core, the second wire having a first end connected to the input of the transformer and having a second end connected to the second output of the transformer.
7. The signal splitter of claim 1, wherein each of the first and second Wilkinson devices comprises:
a plurality of first transmission line sections connected in series between the first input of the Wilkinson device and the first output of the Wilkinson device;
a plurality of second transmission line sections connected in series between the second input of the Wilkinson device and the second output of the Wilkinson device; and
a plurality of balance resistors connected between the first transmission line sections and the second transmission line sections.
8. A method of dividing a signal, the method comprising:
providing the signal to an input of a first transformer, and outputting first and second intermediate output signals from first and second intermediate outputs of the first transformer, a first signal path from the input to the first intermediate output including a portion passing through a first ferrite tube, and a second signal path from the input to the second intermediate output including a portion passing through a second ferrite tube;
providing the first intermediate output signal to an input of a second transformer, and outputting first and second transformed signals from first and second intermediate outputs of the second transformer;
providing the second intermediate output signal to an input of a third transformer, and outputting third and fourth transformed signals from first and second intermediate outputs of the third transformer;
providing the first and second transformed signals to first and second inputs of a first Wilkinson device, and outputting first and second divided output signals from first and second outputs of the first Wilkinson device; and
providing the third and fourth transformed signals to first and second inputs of a second Wilkinson device, and outputting third and fourth divided output signals from first and second outputs of the second Wilkinson device.
9. The method of claim 8, wherein the first transformer comprises:
the first ferrite tube;
a first coax line passing through the first ferrite tube;
the second ferrite tube;
a second coax line passing through the second ferrite tube;
a third coax line passing along an outside of the first ferrite tube; and
a fourth coax line passing along an outside of the second ferrite tube.
10. The method of claim 9, wherein the first transformer further comprises a balance resistor; and wherein:
the first coax line has an inner conductor and an outer conductor, the inner conductor of the first coax line having a first end connected to the input of the first transformer and having a second end connected to the first intermediate output, and the outer conductor of the first coax line having a first end connected to a first side of the balance resistor and having a second end connected to ground;
the second coax line having an inner conductor and an outer conductor, the inner conductor of the second coax line having a first end connected to the input of the first transformer and having a second end connected to the second intermediate output, and the outer conductor of the second coax line having a first end connected to a second side of the balance resistor and having a second end connected to ground;
the third coax line having an inner conductor and an outer conductor, the inner conductor of the third coax line having a first end connected to the second side of the balance resistor and a second end connected to the first intermediate output, and the outer conductor of the third coax line having a first end and a second end both connected to ground; and
the fourth coax line having an inner conductor and an outer conductor, the inner conductor of the fourth coax line having a first end connected to the first side of the balance resistor and a second end connected to the second intermediate output, and the outer conductor of the fourth coax line having a first end and a second end both connected to ground.
11. The method of claim 10, wherein each of the second and third transformers comprises:
a ferrite core;
a first wire passing through the ferrite core, the first wire having a first end connected to the input of the transformer and having a second end connected to the first output of the transformer; and
a second wire passing through the ferrite core, the second wire having a first end connected to the input of the transformer and having a second end connected to the second output of the transformer.
12. The method of claim 8, wherein each of the second and third transformers comprises:
a ferrite core;
a first wire passing through the ferrite core, the first wire having a first end connected to the input of the transformer and having a second end connected to the first output of the transformer; and
a second wire passing through the ferrite core, the second wire having a first end connected to the input of the transformer and having a second end connected to the second output of the transformer.
13. The method of claim 8, wherein each of the first and second Wilkinson devices comprises:
a plurality of first transmission line sections connected in series between the first input of the Wilkinson device and the first output of the Wilkinson device;
a plurality of second transmission line sections connected in series between the second input of the Wilkinson device and the second output of the Wilkinson device; and
a plurality of balance resistors connected between the first transmission line sections and the second transmission line sections.
14. The method of claim 8 wherein providing the signal to the input of the first transformer comprises providing the signal having a frequency range between 4.0 and 6 GHz to the input of the first transformer.
15. A power divider, comprising:
an input port;
a plurality of output ports;
a splitter comprising a plurality of discrete elements, the splitter having an input and a plurality of splitter outputs;
a plurality of transmission lines fabricated on a printed circuit board, each transmission line having a first end coupled to one of the splitter outputs and having a second end coupled to one of the output ports, and having a plurality of transmission line sections between the first end and the second end; and
a plurality of balance resistors each having a first end connected between sections of one of the transmission lines, and having a second end connected between sections of another of the transmission lines,
wherein the splitter comprises:
a first transformer, the transformer comprising:
a first ferrite tube;
a first coax line passing through the first ferrite tube;
a second ferrite tube;
a second coax line passing through the second ferrite tube;
a third coax line passing along an outside of the first ferrite tube; and
a fourth coax line passing along an outside of the second ferrite tube
second and third transformers each having a ferrite core;
wherein the printed circuit board has a first side and a second side and first and second holes passing therethrough, wherein the first and second ferrite tubes each extend partially through a corresponding one of the first and second holes of the printed circuit board, wherein the first and second coax lines are disposed on the first side of the printed circuit board, and wherein the third and fourth coax lines are disposed on the second side of the printed circuit board.
16. The power divider of claim 15, wherein the first transformer further comprises a balance resistor; and wherein:
the first coax line has an inner conductor and an outer conductor, the inner conductor of the first coax line having a first end connected to the input port and having a second end connected to a first output of the first transformer, and the outer conductor of the first coax line having a first end connected to a first side of the balance resistor and having a second end connected to ground;
the second coax line having an inner conductor and an outer conductor, the inner conductor of the second coax line having a first end connected to the input port and having a second end connected to a second output of the first transformer, and the outer conductor of the second coax line having a first end connected to a second side of the balance resistor and having a second end connected to ground;
the third coax line having an inner conductor and an outer conductor, the inner conductor of the third coax line having a first end connected to the second side of the balance resistor and a second end connected to the first output of the first transformer, and the outer conductor of the third coax line having a first end and a second end both connected to ground; and
the fourth coax line having an inner conductor and an outer conductor, the inner conductor of the fourth coax line having a first end connected to the first side of the balance resistor and a second end connected to the second output of the first transformer, and the outer conductor of the fourth coax line having a first end and a second end both connected to ground.
17. The power divider of claim 15, wherein the second and third transformers each comprise:
a first wire passing through the ferrite core, the first wire having a first end connected to the input of the transformer and having a second end connected to a first one of the splitter outputs;
a second wire passing through the ferrite core, the second wire having a first end connected to the input of the transformer and having a second end connected to a second one of the splitter outputs; and
one selected from: (1) a resistor; and (2) a series combination of a resistor and a capacitor, connected between the first and second ones of the splitter outputs.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A double facer for use in a corrugated fiberboard sheet manufacturing system which conveys a single faced corrugated fiberboard sheet and a linerboard in a state where they are placed in a superposed condition, put between heating means and pressing means, and heated and bonded at the same time forming a double faced corrugated fiberboard sheet, said double facer comprising:
moisture content detecting means for detecting moisture content or a parameter correlating with the moisture content of said double faced corrugated fiberboard sheet after said sheet is passed through said heating means;
control means for controlling a heat reception quantity of said double faced corrugated fiberboard sheet on the basis of a detection result from said moisture content detecting means so that the moisture content of said double faced corrugated fiberboard sheet approaches a predetermined optimum moisture content, said control means including a decision means for making a decision as to whether or not a deviation between the optimum moisture content and a moisture content detected by said moisture content detecting means is below a predetermined value,
said control means further including:
a feedback control element for implementing the heat reception quantity control through the use of feedback control when said decision means makes the decision that said deviation is below a predetermined value; and
a feedforward control element for implementing the heat reception quantity control through the use of feedforward control when said decision means makes the decision that said deviation is equal to or more than said predetermined value.
2. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 1, wherein said control means controls a pressing force of said pressing means to control the heat reception quantity.
3. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 2, wherein said control means further includes a control element for implementing preset control during an order change to realize heat reception control agreeing with the order change.
4. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 2, wherein said control means further includes a control element for, when feed speeds of said single faced corrugated fiberboard sheet and said linerboard are lower than a predetermined speed, implementing preset control to realize heat reception control agreeing with the feed speed lower than said predetermined speed.
5. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 4, wherein said control element implementing preset control sets an alteration quantity greater than an alteration quantity set by said feedforward control element.
6. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 2, wherein a temperature sensor is used as said moisture content detecting means.
7. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 2, wherein a moisture sensor is used as said moisture content detecting means.
8. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 2, further comprising scanning means for shifting said moisture content detecting means to scan said double faced corrugated fiberboard sheet in its crosswidth direction and time-averaging means for time-averaging outputs of said moisture content detecting means scanning-shifted by said scanning means.
9. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 2, wherein a plurality of said moisture content detecting means are located at a predetermined interval in a crosswidth direction of said double faced corrugated fiberboard sheet, and width direction-averaging means is additionally provided to average outputs of said plurality of moisture content detecting means.
10. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 2, wherein said control means sets said optimum moisture content on the basis of at least one of a feed speed, fiberboard type, basic weight and flute type.
11. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 1, wherein said control means controls a heating quantity of said heating means to perform the heat reception quantity control.
12. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 11, wherein said control means further includes a control element for implementing preset control during an order change to realize heat reception control agreeing with the order change.
13. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 11, wherein said control means further includes a control element for, when feed speeds of said single faced corrugated fiberboard sheet and said linerboard are lower than a predetermined speed, implementing preset control to realize heat reception control agreeing with the feed speed lower than said predetermined speed.
14. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 13, wherein said control element implementing preset control sets an alteration quantity greater than an alteration quantity set by said feedforward control element.
15. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 11, wherein a temperature sensor is used as said moisture content detecting means.
16. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 11, wherein a moisture sensor is used as said moisture content detecting means.
17. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 11, further comprising scanning means for shifting said moisture content detecting means to scan said double faced corrugated fiberboard sheet in its cross direction and time-averaging means for time-averaging outputs of said moisture content detecting means scanning-shifted by said scanning means.
18. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 11, wherein a plurality of said moisture content detecting means are located at a predetermined interval in a width direction of said double faced corrugated fiberboard sheet, and width direction averaging means is additionally provided to average outputs of said plurality of moisture content detecting means.
19. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 11, wherein said control means sets said optimum moisture content on the basis of at least one of a feed speed, fiberboard type, basic weight and flute type.
20. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 1, wherein said feedforward control element implements the heat reception quantity control through the use of said feedforward control utilizing a calculated value based upon previously obtained data.
21. A double facer for use in a corrugated fiberboard sheet manufacturing system which conveys a single faced corrugated fiberboard sheet and a linerboard in a state where they are placed in a superposed condition, put between heating means and pressing means, and heated and bonded at the same time forming a double faced corrugated fiberboard sheet, said double faced comprising:
moisture content detecting means for detecting moisture content or a parameter correlating with the moisture content of said double faced corrugated fiberboard sheet after said sheet is passed through said heating means; and
control means for controlling a heat reception quantity of said double faced corrugated fiberboard sheet on the basis of a detection result from said moisture content detecting means so that the moisture content of said double faced corrugated fiberboard sheet approaches a predetermined optimum moisture content, said control means including a decision means for making a decision as to whether or not a deviation between the optimum moisture content and a moisture content detected by said moisture content detecting means is below a predetermined value,
said control means controlling pressing force of said pressing means and further including:
a feedback control element for implementing the heat reception quantity control through the use of feedback control when said decision means makes the decision that said deviation is below a predetermined value; and
a feedforward control element for implementing the heat reception quantity control through the use of feedforward control when said decision means makes the decision that said deviation is equal to or more than said predetermined value,
wherein said control element implementing the control using feedforward control previously stores a relationship between said moisture content or said parameter correlating with the moisture content and said pressing force of said pressing means and sets an alteration quantity of the pressing force on the basis of said relationship.
22. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 21, wherein said control element implementing the control using feedforward control previously stores plurality of said relationship, selects a specific relationship among said plurality of said relationship on the basis of at least one of a feed speed of said corrugated fiberboard sheet, fiberboard type and flute and sets the alteration quantity of the pressing force on the basis of said selected relationship.
23. A double facer for use in a corrugated fiberboard sheet manufacturing system which conveys a single faced corrugated fiberboard sheet and a linerboard in a state where they are placed in a superposed condition, put between heating means and pressing means, and heated and bonded at the same time forming a double faced corrugated fiberboard sheet, said double facer comprising:
moisture content detecting means for detecting moisture content or a parameter correlating with the moisture content of said double faced corrugated fiberboard sheet after said sheet is passed through said heating means;
control means for controlling a heat reception quantity of said double faced corrugated fiberboard sheet on the basis of a detection result from said moisture content detecting means so that the moisture content of said double faced corrugated fiberboard sheet approaches a predetermined optimum moisture content, said control means including a decision means for making a decision as to whether or not a deviation between the optimum moisture content and a moisture content detected by said moisture content detecting means is below a predetermined value,
said control means controlling a heating quantity of said heating means to perform heat reception quantity control and further including:
a feedback control element for implementing the heat reception quantity control through the use of feedback control when said decision means makes the decision that said deviation is below a predetermined value and
a feedforward control element for implementing the heat reception quantity control through the use of feedforward control when said decision means makes the decision that said deviation is equal to or more than said predetermined value,
wherein said control element implementing the control using feedforward control previously stores a relationship between said moisture content or said parameter correlating with the moisture content and said heating quantity of said heating means and sets an alteration quantity of the heating quantity on the basis of said relationship.
24. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 23, wherein said control element implementing the control using feedforward control previously stores plurality of said relationship, selects a specific relationship among said plurality of said relationship on the basis of at least one of a feed speed of said corrugated fiberboard sheet, fiberboard type and flute and sets the alteration quantity of the heating quantity on the basis of said selected relationship.
25. A double facer for use in a corrugated fiberboard sheet manufacturing system which conveys a single faced corrugated fiberboard sheet and a linerboard in a state where they are placed in a superposed condition, put between heating box and pressing bar, and heated and bonded at the same time forming a double faced corrugated fiberboard sheet, said double facer comprising:
a moisture content detector to detect moisture content or a parameter correlating with the moisture content of said double faced corrugated fiberboard sheet after said sheet is passed through said heating box;
a controller which is communicably connected to said moisture content detector, to control a heat reception quantity of said double faced corrugated fiberboard sheet on the basis of a detection result from said moisture content detector so that the moisture content of said double faced corrugated fiberboard sheet approaches a predetermined optimum moisture content, said controller including a decision device to make a decision as to whether or not a deviation between the optimum moisture content and a moisture content detected by said moisture content detector is below a predetermined value,
said controller further including:
a feedback control element to implement the heat reception quantity control through the use of feedback control when said decision device makes the decision that said deviation is below a predetermined value; and
a feedforward control element to implement the heat reception quantity control through the use of feedforward control when said decision device makes the decision that said deviation is equal to or more than said predetermined value.
26. A double facer for use in a corrugated fiberboard sheet manufacturing system according to claim 25, wherein said feedforward control element implements the heat reception quantity control through the use of said feedforward control utilizing a value based upon previously obtained data.