Method for controlling transmission of electromagnetic wave on basis of light, and device therefor
A device for controlling transmission of electromagnetic waves according to the present disclosure includes: a conductor line which is positioned on a signal layer and through which electromagnetic waves received via an input terminal travel; a ground layer electrically separated from the signal layer through a dielectric layer and electrically grounded; a shunt via including a first end and a second end and connected to the conductor line through the first end; and a photoconductive semiconductor connected between the second end of the shunt via and the ground layer and having a dielectric state or a conducting state, based on an input of an optical signal, wherein the conductor line is electrically connected to the ground layer via the shunt via and the photoconductive semiconductor in the conducting state, thereby causing reflection of electromagnetic waves from the shunt via.
1. A device for controlling transmission of electromagnetic waves, the device comprising:
a conductor line which is positioned on a signal layer and along which electromagnetic waves received via an input terminal travels;
a ground layer electrically separated from the signal layer through a dielectric layer and electrically grounded;
a shunt via including a first end and a second end and connected to the conductor line through the first end; and
a photoconductive semiconductor which is connected between the second end of the shunt via and the ground layer, and is in a dielectric state or a conducting state, based on an input of an optical signal,
wherein the conductor line is electrically connected to the ground layer through the photoconductive semiconductor in the conducting state, and the shunt via, thereby causing reflection of electromagnetic waves from the shunt via.
2. The device of claim 1 , wherein the device is provided using a printed circuit board, and
the signal layer comprises a conductive layer of the printed circuit board, and the ground layer comprises a ground layer of the printed circuit board.
3. The device of claim 1 , wherein the optical signal comprises a pulse signal,
wherein the pulse signal comprises a first pulse for setting the photoconductive semiconductor to the conducting state and a second pulse having a period shorter than a carrier lifetime of the photoconductive semiconductor.
4. The device of claim 1 , further comprising a matching element configured to form a resonance circuit in a driving frequency band of the device.
5. The device of claim 4 , wherein the matching element comprises an inductive element configured to compensate for parasitic capacitance between the shunt via and the ground layer.
6. The device of claim 5 , wherein the inductive element is connected to the conductor line and the shunt via and provided on the signal layer.
7. The device of claim 6 , wherein the inductive element is provided in a shape of a triangle with a vertex positioned at a point of connection of the conductor line and the shunt via.
8. The device of claim 4 , wherein the matching element comprises a capacitive element electrically connected to the shunt via and configured to compensate for reactance of the shunt via.
9. The device of claim 8 , further comprising an additional dielectric layer outside the signal layer,
wherein the capacitive element is provided in the form of a conductive pad connected to the signal layer and the shunt via through the additional dielectric layer.
10. The device of claim 8 , wherein the capacitive element is provided in the form of a capacitor embedded in the shunt via.
11. The device of claim 4 , further comprising a microstrip branch configured to connect the conductor line and the shunt via,
wherein the matching element is located on the microstrip branch and the location of the matching element is determined based on a wavelength of the electromagnetic waves.
12. A phase shifter which includes a device for controlling transmission of electromagnetic waves, the phase shifter comprising:
a conductor line which is positioned on a signal layer and connected to an input terminal and an end via, and along which electromagnetic waves received through the input terminal travel toward the end via;
a ground layer electrically separated from the signal layer through a dielectric layer and electrically grounded;
a shunt via including a first end and a second end and connected to the conductor line through the first end; and
a photoconductive semiconductor which is connected between the second end of the shunt via and the ground layer, and is in a dielectric state or a conducting state, based on an input of an optical signal,
wherein the conductor line is electrically connected to the ground layer through the photoconductive semiconductor in the conducting state and the shunt via, thereby causing reflection of electromagnetic waves from the shunt via.
13. The phase shifter of claim 12 , wherein the conductor line is electrically insulated from the ground layer through the photoconductive semiconductor in the dielectric state, thereby causing reflection of electromagnetic waves from the end via.
14. The phase shifter of claim 13 , wherein the phase shifter is provided using a printed circuit board, and
the signal layer comprises a conductive layer of the printed circuit board, and the ground layer comprises a ground layer of the printed circuit board.
15. The phase shifter of claim 12 , wherein the optical signal comprises a pulse signal, wherein the pulse signal comprises a first pulse for setting the photoconductive semiconductor to the conducting state and a second pulse having a period shorter than a carrier lifetime of the photoconductive semiconductor.