1. A printed circuit board comprising:
a base insulating layer;
a plurality of signal lines arranged on said base insulating layer, each signal line including a first end, a second end and a wide part between the first end and the second end, the wide parts of the plurality of signal lines arranged in a staggered manner on the base insulating layer;
a cover insulating layer that is provided on said base insulating layer so as to cover at least said wide parts of said plurality of signal lines; and
a conductive layer that is provided on said cover insulating layer,
wherein each of the plurality of signal lines includes a capacitive element, the capacitive element comprising the respective wide part, the cover insulating layer and the conductive layer, such that when a signal is transmitted by a signal line, a harmonic of the signal is removed by the capacitive element of that signal line.
2. The printed circuit board according to claim 1, further comprising a ground line that is provided on said base insulating layer, wherein
said conductive layer is electrically connected to said ground line.
3. The printed circuit board according to claim 2, wherein
said cover insulating layer is formed so as to cover said ground line and said signal line, and
said cover insulating layer includes a through hole for electrically connecting said ground line and said conductive layer.
4. The printed circuit board according to claim 1, wherein said signal line includes a plurality of said wide parts.
5. A printed circuit board comprising:
a base insulating layer;
a plurality of signal lines that are provided on said base insulating layer, the plurality of signal lines including wide parts;
a cover insulating layer that is provided on said base insulating layer so as to cover at least said wide parts of said plurality of signal lines; and
a conductive layer that is provided on said cover insulating layer so as to cover a portion above said wide parts of said plurality of signal lines, wherein
said wide parts of said plurality of signal lines are arranged in a staggered manner,
wherein each of the plurality of signal lines includes a capacitive element, the capacitive element comprising the respective wide part, the cover insulating layer and the conductive layer, such that when a signal is transmitted by a signal line, a harmonic of the signal is removed by the capacitive element of that signal line.
6. A printed circuit board comprising:
a base insulating layer;
a plurality of signal lines that are provided on said base insulating layer, the plurality of signal lines including wide parts;
a cover insulating layer that is provided on said base insulating layer so as to cover at least said wide parts of said plurality of signal lines; and
a conductive layer that is provided on said cover insulating layer so as to cover a portion above said wide parts of said plurality of signal lines, wherein
said wide parts of said plurality of signal lines are arranged in a staggered manner, and
one end of each of said plurality of signal lines is exposed from one end of said cover insulating layer.
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 desk with a double desk plates comprising:
a main desk plate with a larger plane area;
a secondary desk plate with a smaller plane area;
a leg assembly for supporting the main desk plate;
a removable shelf connecting to a bottom of the main desk plate,
a fixing shelf for connecting the removable shelf and the leg assembly;
a supporting stand for connection the secondary desk plate to the fixing shelf; and an original position of the secondary desk plate overlapping an upper space of the main desk plate.
2. The desk with a double desk plates as claimed in claim 1, wherein the removable shelf has a pair of parallel holders; the holders are connected respectively with lateral sides of a bottom of the main desk plate; and between the two holders has at least one crossbeam for connecting the two holders.
3. The desk with a double desk plates as claimed in claim 2, wherein between the two holders and the fixing shelf has a first sliding stick and a second sliding stick connecting respectively with the two holders; the first sliding stick and the second sliding stick are covered respectively by a first sheath and the second sheath; the first sheath and the second sheath are respectively shorter than the first sliding stick and the second sliding stick; and one end of the each sheath is fixed on the fixing shelf firmly.
4. The desk with a double desk plates as claimed in claim 3, wherein each of the two ends of the holders is extended with a connecting sheet toward the fixing shelf so as to connect the first sliding stick and the second sliding stick; a first positioning screw bolt and a second positioning screw bolt are installed on surfaces of bottoms of the first sheath and the second sheath, respectively; each the positioning screw bolt is capable of stretching into the sheath, and being in contact with the sliding stick so as to fix and press the sliding stick firmly.
5. The desk with a double desk plates as claimed in claim 3, wherein a fixing plane of the crossbeam at a reserved position is connected with a third sliding sheath parallel with the first sheath and the second sheath; a third sliding stick is sheathed into the third sliding sheath; and the two ends of the third sliding sheath are fixed on the fixing shelf firmly.
6. The desk with a double desk plates as claimed in claim 2, wherein the main desk plate has a first main desk plate, a second main desk plate and a third main desk plate; the second main desk plate and the third main desk plate are positioned respectively on a left and a right of the first main desk plate; the second main desk plate and the third main desk plate are fixed respectively on the holders of the removable shelf; a front edge of two lateral sides of the first main desk plate is protruded out with two pivots; the second main desk plate and the third main desk plate corresponding to the pivots have respectively connecting pieces for connecting pivotal receivers so as to sheath the pivot; and each the pivot is capable of moving around in the pivotal receiver.
7. The desk with a double desk plates as claimed in claim 3, wherein the main desk plate has a first main desk plate, a second main desk plate and a third main desk plate; the second main desk plate and the third main desk plate are positioned respectively on a left and a right of the first main desk plate; the second main desk plate and the third main desk plate are fixed respectively on the holders of the removable shelf; a front edge of two lateral sides of the first main desk plate is protruded out with two pivots; the second main desk plate and the third main desk plate corresponding to the pivots have respectively connecting pieces for connecting pivotal receivers so as to sheath the pivot; and each the pivot is capable of moving around in the pivotal receiver.
8. The desk with a double desk plates as claimed in claim 6, wherein a connecting support is installed on the crossbeam toward the leg assembly at a vertical direction; the other end of the connecting support is connected with an air pressure tube; the other end of the air pressure tube is connected with a free end of the first main desk plate; by a motive force produced by the air pressure tube, and a free end of the first main desk plate is capable of rotating around the pivot as well as being retained at a reserved positioned.
9. The desk with a double desk plates as claimed in claim 1, wherein an arranging box is installed in a hollow position of the fixing shelf; and a bottom of the arranging box has a plurality of holes.
10. The desk with a double desk plates as claimed in claim 2, wherein an arranging box is installed in a hollow position of the fixing shelf; and a bottom of the arranging box has a plurality of holes.