Abstract:
A stack structure of a high frequency printed circuit, mainly includes a transmission conductor pin group in a form of single row, where each signal pair and each transmission pair of the transmission conductor pin group respectively have a through hole portion thereon, and the inner layer of the circuit board has a trace portion in electric connection with the through hole portion, allowing each four terminals to be formed into one group. Utilizing the clever arrangement of the through hole portions and trace portions separates each terminal properly, thereby increasing the property of transmitted signals, and, at the same time, reducing noise interferences such as EMI and RFI.

Description:
TECHNICAL FIELD OF THE INVENTION 
     The present invention relates to a stack structure of a high frequency printed circuit board, capable of isolating high frequency signals effectively so as to decrease the electromagnetic interference and radio frequency interference caused from the high frequency signals to circuit boards or other external electronic products. 
     DESCRIPTION OF THE PRIOR ART 
     Since interference intensity is inversely proportional to distance, the more delicate electronic products are, the easier they are failure because of interferences. Therefore, how to solve interference problems is an urgent priority. 
     Signals with a frequency larger than 2.4 GHz are referred to as high frequency signals, the interference of which will decrease the sensitivity of wireless reception, and further reduces reception range, being sufficient enough to influence the normal use of wireless devices; such signals cannot be eliminated through filtering such that external housings are used to isolated noises, or a ground terminal is added beside a signal terminal to decrease high frequency noises. But, a single layer of ground terminal has a weak isolation effect if the circuit board is a multilayer board. 
     SUMMARY OF THE INVENTION 
     The main object of the present invention is to provide a stack structure of a printed circuit board, solving the interference problem generated from high frequency signals effectively by collocating a transmission conductor pin group containing high frequency signals with structures such as through hole portions, trace portions and ground layers by means of pairs of signal terminals and pairs of power terminals arranged in a group of four. 
     To achieve the above object, the present invention mainly includes a transmission conductor pin group in a form of single row, first differential power unit, a second differential power unit configured at one side of the first differential power unit, a first differential detection unit configured at one side of the second differential power unit far away from the first differential power unit, a second differential detection unit configured at one side of the first differential detection unit far away from the second differential power unit, a third differential power unit configured at one side of the second differential detection unit far away from the first differential detection unit, and a fourth differential power unit configured at one side of the third differential power unit far away from the second differential detection unit, wherein each differential power unit includes a pair of differential signals and a pair of power transmissions respectively configured at the two sides of each pair of differential signals, and each differential detection unit includes a pair of differential signals and a pair of detection signals respectively configured at the two sides of each pair of differential signals, whereby, when a user adopts the pin arrangement in a form of single row of four differential power units and two differential detection units for the structure composition of a high frequency printed circuit board and utilizes through hole portions, trace portions and ground layers to isolate high frequency signals, the effectiveness of decreasing electromagnetic and radio frequency interferences can then be achieved. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a preferred embodiment of the present invention; 
         FIG. 2  is a schematic view of a stack structure of the embodiment of the present invention; 
         FIG. 3  is a schematic view of the embodiment of the present invention; 
         FIG. 4  is a partly enlarged view of  FIG. 3 ; 
         FIG. 5  is a cross-sectional view taken along line A-A of  FIG. 3 ; 
         FIG. 6  is a schematically perspective view of another preferred embodiment of the structure according to the present invention; and 
         FIG. 7  shows the structure of the  FIG. 6  in a use state. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIGS. 1 to 4 , a high frequency printed circuit board  9  includes a single row form of transmission conductor pin group  91 , and further mainly includes: 
     a first differential power unit  1 , including a pair of first differential signals  11  and a pair of first power transmissions  12  respectively configured at the two sides of the pair of first differential signals  11 ; 
     a second differential power unit  2 , configured at one side of the first differential power unit  1 , and including a pair of second differential signals  21  and a pair of second power transmissions  22  respectively configured at the two sides of the pair of second differential signals  21 ; 
     a first differential detection unit  5 , configured at one side of the second differential power unit  2  far away from the first differential power unit  1 , and including a pair of fifth differential signals  51  and a pair of fifth detection signals  52  respectively configured at the two sides of the pair of fifth differential signals  51 ; 
     a second differential detection unit  6 , configured at one side of the first differential detection unit  5  far away from the second differential power unit  2 , and including a pair of sixth differential signals  61  and a pair of second detection signals  62  respectively configured at the two sides of the pair of differential signals  61 . 
     A third differential power unit  3 , configured at one side of the second differential detection unit  6  far away from the first differential detection unit  5 , including a pair of third differential signals  31  and a pair of third power transmissions  32  respectively configured at the two sides of the pair of third differential signals  31 ; 
     A fourth differential power unit  4  is configured at one side of the third differential power unit  3  far away from the second differential detection unit  6 , and including a pair of fourth differential signals  41  and a pair of fourth power transmissions  42  respectively configured at the two sides of the pair of fourth differential signals  41 . 
     As described above, the pair of first differential signals  11 , the pair of second differential signals  21 , the pair of third differential signals  31 , the pair of fourth differential signals  41 , the pair of fifth differential signals  51  and the pair of sixth differential signals  61  respectively have at least one differential through hole portion  71  thereon, and the pair of first power transmissions  12 , the pair of second power transmissions  22 , the pair of third power transmissions  32  and the pair of fourth power transmissions  42  respectively have at least two power through hole portions  72 . Furthermore, the pair of first detection signals  52  and the pair of second detection signals  62  respectively have at least one detection through hole portion  73  thereon. 
     The differential through hole portion  71  is in electric connection with a differential trace portion  81  positioned on the inner layer of the high frequency printed circuit board  9 , the power through hole portion  72  a power trace portion  82  positioned on the inner layer of the high frequency printed circuit board  9 , and the detection through hole portion  73  a detection trace portion  83  positioned on the inner layer of the high frequency printed circuit board  9 . 
     The appearance of the high frequency printed circuit board  9 , as  FIGS. 1 to 5  show, is not different obviously from general circuit boards, but the internal stack structure thereof is mainly formed with the transmission conductor pin group  91  in a single row by arranging the first, second, third, fourth differential power units ( 1 ,  2 ,  3 ,  4 ) and the first, second differential detection units ( 5 ,  6 ) side by side, and the power through hole portions  72 , as  FIG. 3  shows, are positioned on the power trace portions  82  symmetrically and equidistantly. Furthermore, the number and positions of the surface layers at the two sides of the power through hole portions  72  correspond to each other and the power trace portion  82  is parallel to the differential trace portion  81 , thereby blocking the noises caused from the pairs of first, second, third, fourth differential signals ( 11 ,  21 ,  31 ,  41 ) therebetween. In particular, it can be seen from  FIG. 4  that the spacing of the inner edge of the differential through hole portion  71  is the same as the one of the inner edge of the differential trace portion  81 , the width of the differential trace portion  81  is smaller than the diameter of the differential through hole portion  71 , and the spacing between the outer edge of the differential trace portion  81  and the inner edge of the power trace portion  82  is larger than the spacing of the inner edge of the differential trace portion  81 , thereby controlling a trace distribution condition to decrease the interference to each other. Finally, referring to  FIG. 5 , the differential trace portion  81 , power trace portion  82  and detection trace portion  83  are respectively positioned on the upper and lower layers inside the high frequency printed circuit board  9 , and respectively in communication with each other through the differential through hole portion  71 , power through hole portion  72  and detection through hole portion  73 , thereby reducing the noise interference such as EMI or RFI of high frequency signals. 
     Referring to  FIGS. 6 and 7 , the two surface layers of the high frequency printed circuit board  9   a  respectively have a ground layer  92   a , and a ring groove portion  93   a  for separating the ground layer  92   a  from the power through hole portion  72   a  is configured between the ground layer  92   a  and the surface layer of the power through hole portion  72   a . Furthermore, the ground layer  92   a  has a groove portion  94   a  respectively at the two sides of the first differential power unit  1   a , second differential power unit  2   a , third differential power unit  3   a  and fourth differential power unit  4   a . Finally, an isolation portion  95   a  is adapted to cover the first differential power unit  1   a , second differential power unit  2   a , third differential power unit  3   a , fourth differential power unit  4   a , first differential detection unit  5   a  and second differential detection unit  6   a . Whereby, the ground layers  92   a  on the surface layers of the two sides of the high frequency printed circuit board  9   a  are used to sandwich high frequency signals within the high frequency printed circuit board  9   a , and groove portion  94  is further used to separate the first to fourth differential power units ( 1   a ,  2   a ,  3   a ,  4   a ) and first, second differential detection units ( 5   a ,  6   a ) one by one with the feature of the power through hole portions  72   a  being distributed equidistantly. In addition, the surface layer of each power through hole portion  72   a  having a ring groove portion  93   a  plus each power transmission pair and the ground layer  92   a  being not conductive to each other can avoid a short circuit happening between the ground layer  92   a  and power through hole portion  72   a , thereby increasing the effectiveness of noise suppression substantially. In particular, the isolation portion  95   a  not only allows a connector housing to be soldered thereon but isolates the transmission conductor pin group from the outside, thereby reducing the signal interference between the high frequency printed circuit board  9   a  and a connector connected thereto. 
     The present invention utilizes the way of arranging the four terminals of each differential power unit and each differential detection unit as a group in a row and the clever configurations of each through hole portion and each trace portion, with the layer-by-layer isolation of the ground layer  92   a , ring groove portion  93   a , groove portion  94   a  and isolation portion  95   a , enabling the high frequency printed circuit board to suppress a high frequency noise such as EMI or RFI properly.