Printed circuit board including interdigital slots and/or splits on reference planes for reducing EMI
AssigneeTurkiye Bilimsel Ve Teknolojik Arastirma Kurumu
InventorsAhmet Yasin Citkaya, Seyit Ahmet Sis, Coskun Cosar, Ekrem Demirel, Fatih Ustuner
Life of this patent
Estimating the term…
Abstract
The invention is particularly related to design slot and splits on the reference planes of printed circuit boards with an interdigital geometry having conductive fingers protruding from the opposite edges of the slits and/or splits, and placing these conductive fingers in a way that they are intertwined without contacting each other so as to reduce the electromagnetic radiation level originating from the slots and splits, and to preserve the signal integrity.
Claims2
A printed circuit board that limits electromagnetic radiation and preserves signal integrity by reducing unwanted electromagnetic radiation comprising
- at least a signal layer of the printed circuit board, and
- at least a reference plane on another layer of the printed circuit board
- wherein the printed circuit board comprises:
- at least one slot (9.8) in an interdigital structure consisting of intertwining conductive fingers (9.8.1) protruding from their opposite edges wherein the fingers coming out from opposite sides in the interdigital structure increase the capacitance value between the two edges, allowing the interdigital slot to exhibit lower impedance within a certain frequency range compared to a normal slot, thereby allowing more of the return current to complete its loop through a shorter path as a displacement current instead of touring around the slot,
- and wherein the interdigital slot on the reference plane and the signal line are perpendicularly oriented to one another.
A printed circuit board that limits electromagnetic radiation and preserves signal integrity by reducing unwanted electromagnetic radiation comprising;
- at least two reference planes on two different layers of the printed circuit board,
- wherein at least one of the layers comprises:
- at least one slot (9.8) in the form of an interdigital structure consisting of intertwining conductive fingers (9.8.1) protruding from their opposite edges, wherein the length of the two opposite sides facing each other increases due to the interdigital structure, and this increase in the capacitance decreases the impedance and increases the displacement current, thereby reducing electromagnetic radiation within a certain frequency range;
- and
- wherein at least a signal layer between any two of the adjacent reference planes, and the interdigital slot on the reference plane and the signal line are perpendicularly oriented to one another.
Dependencies are inferred from the claim text.