Printed circuit board product with antenna structure and method for its production

1. A method for producing an intermediate printed circuit board product ( 80 ) with an antenna structure ( 5 ), comprising the following steps:

providing a ground layer ( 10 );

optionally attaching a release layer ( 20 ) with a release layer shape ( 25 ) on one exterior side ( 11 ) of the ground layer ( 10 ), wherein the release layer ( 20 ) is removably positioned ( 22 ) on an antenna subarea ( 12 ) of the exterior side ( 11 ) of the ground layer ( 10 );

attaching a dielectric insulating layer ( 30 ) on one exterior side ( 11 ) of the ground layer ( 10 ) that is if applicable partly covered by the release layer ( 20 ), wherein the release layer ( 20 ) is arranged between the ground layer ( 10 ) and the dielectric insulating layer ( 30 );

attaching a conducting layer ( 40 ) on a first exterior side ( 31 ) of the dielectric insulating layer ( 30 ) opposite to the ground layer ( 10 ) wherein the dielectric insulating layer ( 30 ) is arranged between the conducting layer ( 40 ) and the ground layer ( 10 );

laminating of the ground layer ( 10 ), the at least one dielectric insulating layer ( 30 , 30 ′), the at least one conducting layer ( 40 , 40 ′) and if applicable the release layer ( 20 ) and

optionally attaching a layer arrangement on a first exterior side ( 41 ) of said conducting layer ( 40 ), said layer arrangement comprising at least one further dielectric insulating layer ( 30 ′, 30 ″) and at least one further conducting layer ( 40 ′, 40 ″), whereby at least one further dielectric insulating layer ( 30 ′) is attached on said first exterior side ( 41 ) of the conducting layer ( 40 ) and at least one further conducting layer ( 40 ′) is attached on a first exterior side ( 31 ) of at least one further dielectric insulating layer ( 30 ′, 30 ″), to obtain a first semi-finished product ( 50 );

manufacturing of at least one antenna cavity ( 60 ) within the first semi-finished product ( 50 ) starting on its exterior side ( 51 ) that is made up of the at least one conducting layer ( 40 , 40 ′) and extending throughout at least one conducting layer ( 40 ) as well as at least one dielectric insulating layer ( 30 ) with a cavity height ( 65 ) equal to the sum of at least one conducting layer height ( 45 ) and at least one dielectric insulating layer height ( 35 ), wherein if applicable a cavity projection area ( 61 ) corresponds to the release layer shape ( 25 ) and is positioned ( 22 ) on the antenna subarea ( 12 ) covered by the release layer ( 20 ) and wherein a ground-plane area ( 62 ) of the cavity ( 60 ) is made up of the release layer ( 20 );

optionally coating ( 66 ) of the side walls ( 67 , 68 ) within the antenna cavity ( 60 );

attaching a compound signal layer ( 70 ) on the exterior side ( 51 ) made up of the conducting layer ( 40 ) of the first semi-finished product ( 50 ), wherein the compound signal layer ( 70 ) covers the antenna cavity ( 60 ); and

laminating of the first semi-finished product ( 50 ) and the compound signal layer ( 70 ) to obtain an intermediate printed circuit board product ( 80 ).

2. The method of claim 1 , wherein the compound signal layer ( 70 ) comprises a dielectric no-flow prepreg layer ( 76 ) and a conducting metal layer ( 78 ) directly attached to the dielectric no-flow prepreg layer ( 76 ) wherein the dielectric no-flow prepreg layer ( 76 ) is attached to a conducting layer ( 40 ) of the first semi-finished product ( 50 ).

3. The method of claim 1 , wherein the ground layer ( 10 ) is made of a laminated compound layer comprising at least two conducting metal layers ( 14 , 16 ) laminated with an insulating layer ( 18 ) in between the at least two conducting metal layers ( 14 , 16 ), where optionally a layer arrangement comprising at least one further insulating layer ( 18 ′) and at least one further conducting metal layer ( 16 ′) is stacked up and is laminated with the preceding layers to form the laminated compound layer.

4. The method of claim 1 , wherein the antenna cavity ( 60 ) has a vent through-hole ( 69 ) arranged between the ground-plane area ( 62 ) of the cavity ( 60 ) and an exterior side ( 82 ) of the intermediate printed circuit board product ( 80 ).

5. The method of claim 1 , wherein the antenna cavity ( 60 ) is surrounded with shielding vias ( 110 ) that are arranged within the laminated ground layer ( 10 ) and/or at least one dielectric insulating layer ( 30 ) and/or at least one conducting layer ( 40 ) and/or compound signal layer ( 70 ) in a distance ( 115 ) in regard to the antenna cavity ( 60 ).

6. The method of claim 1 , wherein the antenna structure ( 5 ) comprises an antenna design area ( 6 ) that is arranged on an exterior side ( 71 ) of the compound signal layer ( 70 ).

7. The method of claim 1 , wherein a digital processing area ( 105 ) with a digital processing structure ( 100 ) comprising at least one signal processing unit ( 101 ) is mounted on or embedded within the intermediate printed circuit board product ( 80 ) in a distance ( 125 ) in regard to the antenna cavity ( 60 ), whereby the signal processing unit ( 101 ) is connected via at least one antenna signal line ( 104 ) with the antenna structure ( 5 ) and is designed for analogue and digital signal processing of antenna signals.

8. The method of claim 1 , wherein solder masks ( 91 , 92 ) are affixed on one or both exterior sides ( 81 , 82 ) of one intermediate printed circuit board product ( 80 ) or on one or both exterior sides ( 81 , 82 ) of at least two previously interconnected and stacked-up intermediate printed circuit board products ( 80 ).

9. A method for producing an intermediate printed circuit board product ( 80 ) with an antenna structure ( 5 ), comprising the following steps:

providing a ground layer ( 10 );

attaching a dielectric insulating layer ( 30 ) on one exterior side ( 11 ) of the ground layer ( 10 ), wherein the dielectric insulating layer ( 30 ) has at least one recess ( 39 ) extending throughout the dielectric insulating layer height ( 35 ) of the dielectric insulating layer ( 30 ), and wherein the at least one recess ( 39 ) is positioned on an antenna subarea ( 12 ) of the exterior side ( 11 ) of the ground layer ( 10 );

attaching a conducting layer ( 40 ) on a first exterior side ( 31 ) of the dielectric insulating layer ( 30 ) opposite to the ground layer ( 10 ), wherein the dielectric insulating layer ( 30 ) is arranged between the conducting layer ( 40 ) and the ground layer ( 10 ), and wherein the conducting layer ( 40 ) preferably has at least one recess ( 49 ) extending throughout the conducting layer height ( 45 ) of the conducting layer ( 40 ) which at least one recess ( 49 ) is positioned coextensive with the at least one recess ( 39 ) of the dielectric insulating layer ( 30 );

laminating of the ground layer ( 10 ), the at least one dielectric insulating layer ( 30 ) and the at least one conducting layer ( 40 ) and

optionally attaching a layer arrangement on a first exterior side ( 41 ) of said conducting layer ( 40 ), said layer arrangement comprising at least one further dielectric insulating layer ( 30 ′, 30 ″) and at least one further conducting layer ( 40 ′, 40 ″), whereby at least one further dielectric insulating layer ( 30 ′, 30 ″) is attached on said first exterior side ( 41 ) of the conducting layer ( 40 ) and at least one further conducting layer ( 40 ′) is attached on a first exterior side ( 31 ) of at least one further dielectric insulating layer ( 30 ′), and wherein preferably at least one further dielectric insulating layer ( 30 ′, 30 ″) and at least one further conducting layer ( 40 ′, 40 ″) has at least one recess ( 39 , 49 ) that is positioned in registry with at least one of the preceding recesses ( 39 , 49 ) as well as in registry with an antenna subarea ( 12 ) on the exterior side ( 11 ) of the ground layer ( 10 ), to obtain a first semi-finished product ( 50 );

receiving at least one antenna cavity ( 60 ) within the first semi-finished product ( 50 ) starting on its exterior side ( 51 ) that is made up of the recess ( 49 ) of at least one conducting layer ( 40 ) as well as the coextensive recess ( 39 ) of at least one dielectric insulating layer ( 30 ), the at least one antenna cavity ( 60 ) comprising a cavity height ( 65 ) equal to the sum of at least one conducting layer height ( 45 ) and at least one dielectric insulating layer height ( 35 ), wherein a cavity projection area ( 65 ) of the antenna cavity ( 60 ) is positioned ( 22 ) on the antenna subarea ( 12 );

optionally coating ( 66 ) of the side walls ( 67 , 68 ) within the antenna cavity ( 60 );

attaching a compound signal layer ( 70 ) on the exterior side ( 51 ) made up of the conducting layer ( 40 ) of the first semi-finished product ( 50 ), wherein the compound signal layer ( 70 ) covers the at least one antenna cavity ( 60 ); and

laminating of the first semi-finished product ( 50 ) and the compound signal layer ( 70 ) to obtain an intermediate printed circuit board product ( 80 ).

10. The method of claim 9 , wherein the compound signal layer ( 70 ) comprises a dielectric no-flow prepreg layer ( 76 ) and a conducting metal layer ( 78 ) directly attached to the dielectric no-flow prepreg layer ( 76 ) wherein the dielectric no-flow prepreg layer ( 76 ) is attached to a conducting layer ( 40 ) of the first semi-finished product ( 50 ).

11. The method of claim 9 , wherein the ground layer ( 10 ) is made of a laminated compound layer comprising at least two conducting metal layers ( 14 , 16 ) laminated with an insulating layer ( 18 ) in between the at least two conducting metal layers ( 14 , 16 ), where optionally a layer arrangement comprising at least one further insulating layer ( 18 ′) and at least one further conducting metal layer ( 16 ′) is stacked up and is laminated with the preceding layers to form the laminated compound layer.

12. The method of claim 9 , wherein the antenna cavity ( 60 ) has a vent through-hole ( 69 ) arranged between the ground-plane area ( 62 ) of the cavity ( 60 ) and an exterior side ( 82 ) of the intermediate printed circuit board product ( 80 ).

13. The method of claim 9 , wherein the antenna cavity ( 60 ) is surrounded with shielding vias ( 110 ) that are arranged within the laminated ground layer ( 10 ) and/or at least one dielectric insulating layer ( 30 ) and/or at least one conducting layer ( 40 ) and/or compound signal layer ( 70 ) in a distance ( 115 ) in regard to the antenna cavity ( 60 ).

14. The method of claim 9 , wherein the antenna structure ( 5 ) comprises an antenna design area ( 6 ) that is arranged on an exterior side ( 71 ) of the compound signal layer ( 70 ).

15. The method of claim 9 , wherein a digital processing area ( 105 ) with a digital processing structure ( 100 ) comprising at least one signal processing unit ( 101 ) is mounted on or embedded within the intermediate printed circuit board product ( 80 ) in a distance ( 125 ) in regard to the antenna cavity ( 60 ), whereby the signal processing unit ( 101 ) is connected via at least one antenna signal line ( 104 ) with the antenna structure ( 5 ) and is designed for analogue and digital signal processing of antenna signals.

16. The method of claim 9 , wherein solder masks ( 91 , 92 ) are affixed on one or both exterior sides ( 81 , 82 ) of one intermediate printed circuit board product ( 80 ) or on one or both exterior sides ( 81 , 82 ) of at least two previously interconnected and stacked-up intermediate printed circuit board products ( 80 ).

17. An intermediate printed circuit board product ( 80 ) with an antenna structure ( 5 ), wherein at least one antenna cavity ( 60 ) is arranged within a first semi-finished product ( 50 ) comprising:

at least one ground layer ( 10 );

at least one dielectric insulating layer ( 30 ) which is attached to the ground layer ( 10 ); and

at least one conducting layer ( 40 ) which is attached to the dielectric insulating layer ( 30 ) opposite to the ground layer ( 10 ) in a way that the at least one dielectric insulating layer ( 30 ) is arranged between the at least one conducting layer ( 40 ) and the ground layer ( 10 ),

whereby the ground layer ( 10 ), the at least one dielectric insulating layer ( 30 ) and the at least one conducting layer ( 40 ) are laminated, and

wherein the antenna cavity ( 60 ) touches the ground layer ( 10 ) alongside a ground-plane area ( 62 ) and extends throughout the at least one conducting layer ( 40 ) as well as the at least one dielectric insulating layer ( 30 ) with a cavity height ( 65 ) equal to the sum of at least one conducting layer height ( 45 ) and of at least one dielectric insulating layer height ( 35 ), wherein a compound signal layer ( 70 ) is attached on the conducting layer ( 40 ) of the first semi-finished product ( 50 ) covering the antenna cavity ( 60 ), and the first semi-finished product ( 50 ) and the compound signal layer ( 70 ) are laminated.

18. The intermediate printed circuit board product ( 80 ) of claim 17 , wherein the antenna cavity ( 60 ) is surrounded with shielding vias ( 110 ) that are arranged within the ground layer ( 10 ) and/or dielectric insulating layer ( 30 ) and/or conducting layer ( 40 ) and/or compound signal layer ( 70 ) in a distance ( 115 ) to the antenna cavity ( 60 ).

19. The intermediate printed circuit board product ( 80 ) of claim 17 , wherein the compound signal layer ( 70 ) comprises a dielectric no-flow prepreg layer ( 76 ) and a conducting metal layer ( 78 ) directly attached to the dielectric no-flow prepreg layer ( 76 ) wherein the dielectric no-flow prepreg layer ( 76 ) is attached to a conducting layer ( 40 ) of the first semi-finished product ( 50 ).

20. The intermediate printed circuit board product ( 80 ) of claim 17 , wherein a digital processing area ( 105 ) with a digital processing structure ( 100 ) comprising at least one signal processing unit ( 101 ) that is mounted on or embedded within the intermediate printed circuit board product ( 80 ) in a distance ( 125 ) to the antenna cavity ( 60 ), whereby the processing unit ( 101 ) is connected via at least one antenna signal line ( 104 ) with the antenna structure ( 5 ) and is designed for analogue and digital signal processing of antenna signals.

21. The intermediate printed circuit board product ( 80 ) of claim 17 , wherein at least one antenna cavity ( 60 ) has a vent through-hole ( 69 ) starting from the ground-plane area ( 62 ) and passing throughout the laminated ground layer ( 10 ).

22. A printed circuit board ( 1 ) with an antenna structure ( 5 ) comprising:

at least one intermediate printed circuit board product ( 80 ) of claim 17 ; and

a solder mask ( 91 , 92 ) applied on one or both exterior sides ( 81 , 82 ) of the at least one intermediate printed circuit board product ( 80 ) or on one or both exterior sides ( 81 , 82 ) of at least two previously interconnected and stacked-up intermediate printed circuit board products ( 80 ).