first coupler segment spanning a first portion of the circumference of the annular coupler the annular coupler may further include a second coupler segment electrically insulated from the first coupler segment which spans a second portion of the circumference of the annular coupler in selected aspects the first and second portions do not overlap one another along the circumference in certain aspects the first and second coupler segments each span about fifty percent of the circumference of the annular coupler thus each coupler segment may make up roughly half of the annular coupler application_number US 35412409 A description it will be readily understood that the components of the present invention as generally described and illustrated in the figures herein could be arranged and designed in a wide variety of different configurations thus the following more detailed description of aspects of apparatus and methods of the present invention as represented in the figures is not intended to limit the scope of the invention as claimed but is merely representative of various selected aspects of the invention the illustrated aspects of the invention will be best understood by reference to the drawings wherein like parts are designated by like numerals throughout those of ordinary skill in the art will of course appreciate that various modifications to the apparatus and methods described herein may be easily made without departing from the essential characteristics of the invention as described in connection with the figures thus the following description of the figures is intended only by way of example and simply illustrates certain selected aspects consistent with the invention as claimed herein fig1 shows a pair of transmission lines 102 a 102 b and a split coil annular coupler 104 incorporated into the pin end 108 of a downhole tool 100.