3 results about "FR-4" patented technology

The present invention provides a novel squiggly shaped taper for achieving an impedance matching for the larger bandwidth frequency ranging from 3 GHz to 20 GHz. The said squiggly shaped taper has size of 30×35 mm2 and comprises a circular metallic patch 102 with dielectric substrate 101 and Perfect Electrical Conductor 103 placed on one side and other side remains blank as a single sided PCB. all patch, ground, and tapered feed are comprised of 0.035 mm PEC, and the tapered feed comprises two feed widths inner feed P1 and another feed as P2 and the value of other feed varies with the value of S-parameter. The feed provides zig zag arrangement structure 105 where simultaneous increase and decrease of feed is achieved; the said dielectric substrate 101 is comprising of a FR 4 material exhibiting a dielectric constant of 4.4, thickness of 0.16 mm and loss tangent of 0.0024; further the said antenna provides an impedance bandwidth of 144% from 3.3 GHz to 20.3 GHz and a gain of 5.167 dBi at 14.9 GHz frequency and covers whole Ultra-wide band.

The utility model relates to the technical field of urban rail train wireless transceiver equipment, concretely relates to a shell structure of urban rail train wireless transceiver equipment, the upper casing and lower casing of the design are fixedly connected through a plurality of inner hexagon countersunk head bolts and pull rivet nut, and a plurality of rivet studs set up in the bottom of lower casing install the isolating plate, and a plurality of copper studs are set up again on the isolating plate to support PCBA board, and this kind of layout utilizes internal installation space to the maximum, simultaneously, the isolating plate and the rivet stud are fixed through the first hexagon bolt and the first CS type lock washer, and the PCBA board and copper stud are connected through cross disc head bolt, ensure the stability and the simplicity of installation, in addition, the upper casing and lower casing adopt SPCC material, and the isolating plate adopts FR 4 board, guarantee the structural strength, and improve the safe operation ability of equipment under extreme working condition, and the design not only optimizes internal space utilization, but also simplified the installation and maintenance process.