1 2 Previous Next 19 Replies Latest reply on Jan 23, 2015 4:47 PM by erik.anderson.2

    PSOC4 BLE Antenna Dimensions

    erik.anderson.2

      Hi,

         

      Was wondering if someone has the dimensions of the PCB antenna on the PSoC4 BLE dev kit.  The trace looks about 0.5mm wide.  I'm doing a layout in eagle.  But .pdf or any graphic file with the dimensions will do.

         

      Thanks!

         

      Erik

        • 1. Re: PSOC4 BLE Antenna Dimensions
          user_78878863

          AN91445 (Anetanna design guide) should help: http://www.cypress.com/?rID=102512

          • 2. Re: PSOC4 BLE Antenna Dimensions
            user_14586677

            Here are the Gerbers, attached.

               

             

               

            Rewgards, Dana.

               

             

               

             

               

             

               

            Looks like file attach not working, look in programs folder, cypress, and you will

               

            see the BLE kit folder

               

             

               

            C:\Program Files (x86)\Cypress\CY8CKIT-042-BLE Kit\1.0\Hardware\BLE Pioneer Board

               

             

               

            Regards, Dana.

            • 3. Re: PSOC4 BLE Antenna Dimensions
              user_385660486

              Look at Antenna Design Guide figure 10 about MIFA type antenna PCB two layers layout.

              • 4. Re: PSOC4 BLE Antenna Dimensions
                erik.anderson.2

                 Thanks for the input.  Here is the antenna library in Eagle if anyone wants to use it.  This is for 62mil FR4 (proto board).  Just remove the .txt extension and pop the file into your Eagle library folder.

                   

                Erik

                • 5. Re: PSOC4 BLE Antenna Dimensions
                  user_475187498

                  I have a doubt in AN91445 figure15. In 62mils L-leg says 215Mils. But acording to figure 10, maximum is 170mils.  What is wrong in my understanding?

                     

                  Thanks,

                     

                  Aitor

                  • 6. Re: PSOC4 BLE Antenna Dimensions
                    user_13484954

                    I am also confused about antenna and matching network design. Wherever you look there seems to be different designs. The size of the antenna in the design guide does not match the sizes in various example designs, which are all different. Furthermore the matching components vary. The BLE Mouse RDK uses 2 capacitors and an inductor. The BLE Remote RDK uses three capacitors and an inductor. PRoC BLE module for the pioneer kit uses one capacitor and one inductor. Datasheet specifies two capacitors and one inductor. 

                       

                    Also the antenna design guide makes no mention of 4 layer boards. Looking at the Gerbers for the Dongle for example, the top layer and the ground layer basically follow the design guide which has a cut-out in the ground layer. But the bottom layer which is also ground, does not have the cutout. Furthermore does "board thickness" mean the distance between the top layer and ground plane or the actual board thickness when a 4-layer board is used?

                    • 7. Re: PSOC4 BLE Antenna Dimensions
                      user_14586677

                      Layout, size of traces, sandwich thickness, loading, geometry of

                         

                      traces to antenna, all factors that result in different antenna optimi-

                         

                      zations. Also filters for harmonic suppression, FCC requirements, vary

                         

                      due to a myriad of factors. This is RF, a bit of an art in practice. So

                         

                      you will see variations. Motorola / Freescale many good ap notes on

                         

                      RF practices, same for ARRL.

                         

                       

                         

                      There are simulators for pc layout, geometry, stripline design.

                         

                       

                         

                      I would follow the ap note as that relates directly to the output matching

                         

                      of the Tx design for proper power delivery to the antenna.

                         

                       

                         

                      Regards, Dana.

                      • 8. Re: PSOC4 BLE Antenna Dimensions
                        user_14586677

                        You have to add pics as a file attach, yes we can see them, they then disappear into a

                           

                        forum software black hole.

                           

                         

                           

                        Regards, Dana.

                        • 9. Re: PSOC4 BLE Antenna Dimensions
                          user_242978793

                          Ander454: Here is the design guide it covers the issue really well.  Antenna and strip line design is a very cut and try process that requires very expensive equipment to debug and tune the design. You can make a design that works but will not be perfect due to variances in the fiberglass process and trace width changes due to over or under etching of the traces. 

                          • 10. Re: PSOC4 BLE Antenna Dimensions
                            user_242978793

                            Ander454: I have even used epoxy to tune the balun feed connection by adding more or less of it on the antenna feed connection. We also  purchased our blank fiberglass from only vendors that meet our testing requirements.  I am surprised that the don't use a spiral antenna for this application or helix design.  I realize that they are looking for broad coverage so I guess that they are using a dipole for this reason.  But it I wanted  to cover a large distance. I would be looking at a Yagi or spiral antenna.    His is a high frequency and is affected by the smallest things in the design of the antenna circuit. 

                            • 11. Re: PSOC4 BLE Antenna Dimensions
                              ted_1467596

                              Aitor (and others).  Having looked at the Gerbers that Cypress supplies for the MIFA antenna, specifically for an FR4, 2-layer, 62 mil-thick PCB, the size of the L-Tip (no that's not a typo) is 165 mils, I used this for my Diptrace footprint design for this antenna.  I am guessing that Table 3 on page 13 is wrong but I hope we can get clarification from Cypress before I have boards made.  

                              • 12. Re: PSOC4 BLE Antenna Dimensions
                                ted_1467596

                                I agree with azabalo, Fig 15 seems messed up.  I am creating these antennae in Diptrace and, if I implement the 62 mil (1.6 mm) board thickness parameter for 'L_leg= 215 Mils', it looks wrong and not at all like the antenna on the PSoC4 BLE, see the attached pictures

                                   

                                 

                                   

                                   

                                • 13. Re: PSOC4 BLE Antenna Dimensions
                                  user_14586677

                                  File a CASE -

                                     

                                   

                                     

                                  To create a technical or issue case at Cypress -

                                     

                                   

                                     

                                  www.cypress.com

                                     

                                  “Design Support”

                                     

                                  “Create a Support Case”

                                     

                                   

                                     

                                  You have to be registered on Cypress web site first.

                                     

                                   

                                     

                                  Regards, Dana.

                                  • 14. Re: PSOC4 BLE Antenna Dimensions
                                    user_13484954

                                    Yes there is definitely something wrong here. The gerber files follow the diagram on page 9 which doesnt specify a board thickness but according to the distance "W" and table 2, this is a 1.6mm board. But the L-Tip is wrong and doesnt match any of the reference designs or table 3. 

                                       

                                    The HID Mouse RDK uses a double-sided board of 1.6mm and the L-Leg measurement is 40 mil. 

                                       

                                    The table 3 specification of 215 mils for this would extend above the rest of the traces.

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