Multilayer electromagnetic wave transmission board assembled by an adhesive and including a barrier to block the adhesive from flowing into a waveguide channel
An electromagnetic wave transmission board includes a composite board and a plated metal layer. The composite board has a plurality of inner walls surroundingly defining an elongated channel in an interior of the composite board. The plated metal layer is formed on at least part of the inner walls so as to jointly form an inner channel structure in the channel. The inner channel structure surroundingly defines a predetermined space filled with air, and the inner channel structure has two entrances in air communication with the predetermined space. The predetermined space of the inner channel structure is configured to receive and output an electromagnetic wave signal through the two entrances, respectively, and the electromagnetic wave transmission board is configured to transmit the electromagnetic wave signal by using the air in the predetermined space of the inner channel structure as a conductive medium.
1. An electromagnetic wave transmission board, comprising:
a composite board including:
a multilayer structure including an upper plate and a lower plate;
an adhesive that connects the upper plate and the lower plate; and
a first conductive layer and a second conductive layer respectively disposed on surfaces of the upper plate and the lower plate and the upper and lower plates have openings therein, wherein the first conductive layer, the second conductive layer, the adhesive, the upper plate and the lower plate jointly define an elongated channel in an interior of the composite board;
a first plated metal layer and a second plated metal layer, wherein the first plated metal layer and the second plated metal layer are formed on inner walls of the first conductive later, the second conductive layer, the adhesive, the upper plate, and the lower plate, and wherein the first plated metal layer and the second plated metal layer have respective entrances that are positioned in alignment with the corresponding openings; and
a barrier sandwiched between the first plated metal layer and the second plated metal layer, wherein the first plated metal layer, the second plated metal layer, and the barrier jointly form an inner channel structure in the elongated channel, wherein the inner channel structure surroundingly defines a predetermined space filled with air, and the barrier is configured to block the adhesive from flowing into the predetermined space, and wherein the predetermined space is in air communication with an external space extending through each of the entrances and the corresponding opening,
wherein the predetermined space of the inner channel structure is configured to receive and output an electromagnetic wave signal through the two respective entrances, and the electromagnetic wave transmission board is configured to transmit the electromagnetic wave signal through the predetermined space of the inner channel structure.
2. The electromagnetic wave transmission board according to claim 1 , wherein the first conductive layer covers an outer surface of the upper plate and includes a first shielding portion arranged at one side of the elongated channel, the second conductive layer covers an outer surface of the lower plate and includes a second shielding portion arranged at another side of the elongated channel, and the respective openings are formed in the first shielding portion and the second shielding portion, and wherein the first and/or second plated metal layers include:
the first plated metal layer formed on the inner walls of the upper plate and the first shielding portion, wherein the first plated metal layer having a respective one of the entrances, and the first plated metal layer includes at least one first extending portion formed on a portion of the inner surface of the upper plate adjacent to the inner walls of the upper plate; and
the second plated metal layer formed on the inner walls of the lower plate and the second shielding portion, wherein the second plated metal layer respectively including the other one of the entrances, and the second plated metal layer includes at least one second extending portion formed on a portion of the inner surface of the lower plate adjacent to the inner walls of the lower plate, and wherein the barrier is sandwiched between the at least one first extending portion and the at least one second extending portion so as to block the adhesive from flowing into the predetermined space.