Board-to-board interconnect apparatus including a microstrip circuit connected by a waveguide, where a bandwidth of a frequency band is adjustable
View Patent ↗Disclosed is a chip-to-chip interface using a microstrip circuit and a dielectric waveguide. A board-to-board interconnection device, according to one embodiment of the present invention, comprises: a waveguide which has a metal cladding and transmits a signal from a transmitter-side board to a receiver-side board; and a microstrip circuit which is connected to the waveguide and has a microstrip-to-waveguide transition (MWT), wherein the microstrip circuit matches a microstrip line and the waveguide, adjusts the bandwidth of a predetermined first frequency band among the frequency bands of the signal, and provides same to the receiver.
1. A board-to-board interconnect apparatus comprising:
a waveguide which transmits a signal from a board on the side of a transmitter to a board on the side of a receiver and has a metal cladding; and
a microstrip circuit which is formed on each of the transmitter-side board and the receiver-side board,
wherein the microstrip circuit is connected to the waveguide and has a microstrip-to-waveguide transition (MWT),
wherein the microstrip circuit adjusts a bandwidth of a first predetermined frequency band of the signal to provide the signal to the receiver, and
wherein the bandwidth of the first predetermined frequency band is adjusted by adjusting a slope of an upper cutoff frequency band of the signal.
2. The board-to-board interconnect apparatus of claim 1 , wherein the microstrip circuit comprises:
a microstrip feeding line which supplies the signal in a first layer of the board on which the microstrip circuit is formed;
a probe element which adjusts the bandwidth of the first predetermined frequency band;
a slotted ground plane including a slot for minimizing a ratio of reverse-traveling waves to forward-traveling waves in a second layer of the board on which the microstrip circuit is formed, wherein the forward-traveling waves travel from the microstrip circuit to the waveguide, and the reverse-traveling waves travel from the waveguide to the microstrip circuit;
a ground plane including vias for forming an electrical connection between the slotted ground plane and the ground plane in a third layer of the board on which the microstrip circuit is formed; and
a patch which is disposed in the third layer and is electrically isolated from the ground plane and radiates the signal at a resonance frequency.
3. The board-to-board interconnect apparatus of claim 2 , wherein the probe element has a characteristic impedance greater than a characteristic impedance of the microstrip feeding line.
4. The board-to-board interconnect apparatus of claim 2 , wherein the probe element is connected to an end of the microstrip feeding line, and has a predetermined width and length.
5. The board-to-board interconnect apparatus of claim 4 , wherein the length of the probe element is determined based on a wavelength of the resonance frequency.
6. The board-to-board interconnect apparatus of claim 4 , wherein the width of the probe element is 40 to 80% of a width of the microstrip feeding line.
7. A microstrip circuit comprising:
a microstrip feeding line which supplies a signal in a first layer of a board on which the microstrip circuit is formed;
a probe element which adjusts a bandwidth of a first predetermined frequency band of the signal;
a slotted ground plane including a slot for minimizing a ratio of reverse-traveling waves to forward-traveling waves in a second layer of the board on which the microstrip circuit is formed, wherein the forward-traveling waves travel from the microstrip circuit to a waveguide connected to the microstrip circuit, and the reverse-traveling waves travel from the waveguide to the microstrip circuit;
a ground plane including vias for forming an electrical connection between the slotted ground plane and the ground plane in a third layer of the board on which the microstrip circuit is formed; and
a patch which is disposed in the third layer and is electrically isolated from the ground plane and radiates the signal at a resonance frequency,
wherein the bandwidth of the first predetermined frequency band is adjusted by adjusting a slope of an upper cutoff frequency band of the signal.
8. The microstrip circuit of claim 7 , wherein the probe element has a characteristic impedance greater than a characteristic impedance of the microstrip feeding line.
9. The microstrip circuit of claim 7 , wherein the probe element is connected to an end of the microstrip feeding line, and has a predetermined width and length.
10. The microstrip circuit of claim 9 , wherein the length of the probe element is determined based on a wavelength of the resonance frequency.
11. The microstrip circuit of claim 9 , wherein the width of the probe element is 40 to 80% of a width of the microstrip feeding line.