KR-20260067284-A - Modulation apparatus using even-odd mode coupling

Abstract

The present invention discloses a modulation device through even-radix mode coupling. According to the present invention, a modulation device through even-radix mode coupling is provided, comprising: a first oscillator array including two oscillators having the same phase; a coupling network connected to the first oscillator array; and a second oscillator array connected to the coupling network, wherein the phase of one of the first oscillator array and the second oscillator array is changed by changing the input power applied to the coupling network to become either odd mode coupling or even mode coupling, thereby performing on-off modulation.

Inventors

• 이재성
• 남기영

Assignees

• 고려대학교 산학협력단

Dates

Publication Date

20260512

Application Date

20250318

Priority Date

20241105

Claims (5)

1. As a modulation device through excellent-radix mode coupling, A first oscillator array comprising two oscillators having the same phase; A coupling network connected to the first oscillator array; and It includes a second oscillator array connected to the above coupling network, A modulation device through even-radix mode coupling that performs on-off modulation by changing the phase of one of the first oscillator array and the second oscillator array through a change in input power applied to the coupling network to make it either odd mode coupling or even mode coupling.
2. In paragraph 1, A modulation device through even-radix mode coupling in which the above input power change is performed by an active element including a varactor or switch connected to the coupling network.
3. In paragraph 1, The two oscillators of each of the first oscillator array and the second oscillator array are modulation devices through even-odd mode coupling connected by passive components.
4. In paragraph 1, A modulation device through even-radix mode coupling that makes the radix mode impedance of the coupling network zero for signal cancellation by the first oscillator array and the second oscillator array.
5. In paragraph 1, A modulation device through even-odd mode coupling that makes the even mode impedance of the coupling network zero in order to combine signals from the first oscillator array and the second oscillator array.

Description

Modulation apparatus using even-odd mode coupling The present invention relates to a modulation device through even-odd mode coupling, and more specifically, to a device capable of achieving modulation when designing a semiconductor device-based oscillator array circuit in the sub-millimeter wave band. Modern high-frequency communication systems require ultra-high-speed, large-capacity data transmission, so technology capable of high transmission speeds through modulation is necessary. According to Shannon's theorem, transmission speed is proportional to bandwidth and has a logarithmic relationship with signal level. Since increasing the frequency band of a communication system is highly effective for expanding bandwidth, research on implementing high-frequency communication systems is actively underway. One of the various methods for implementing high-frequency communication systems is to add switches to the oscillator to perform on-off modulation, which switches the signal between an output state and a non-output state. FIG. 1 is a diagram illustrating a sub-millimeter wave band oscillator with on-off modulation according to the prior art. In the case of conventional oscillators, modulation is performed by adding a switch to the output terminal of the oscillator, and the on-off state of the oscillator output is controlled by adjusting the impedance of the switch. FIG. 2 is a diagram illustrating the operation of an oscillator according to the prior art. In the low frequency band, the impedance appears as either open or short depending on whether the switch is on or off. Therefore, when the switch is off, the impedance appears as a short circuit, allowing the current from the output terminal to flow entirely through the switch to ground, resulting in no output. Conversely, when the switch is on, the impedance appears as an open circuit, preventing current from flowing through the switch, so a normal output is produced. However, in high frequency bands such as the sub-millimeter wave band, the switch added to the output stage of the oscillator appears as a specific impedance rather than being open or short. When the switch is in the ON state, the switch's impedance does not appear to be open; therefore, the current from the output terminal does not fully flow out, and some current leaks out through the switch, resulting in power loss. Additionally, when the switch is in the OFF state, the switch's impedance does not appear to be short-circuited but rather exhibits a specific impedance. Consequently, since the output is not completely absent, a problem may arise where the ON and OFF states cannot be fully distinguished in ON-OFF modulation. In the case of conventional oscillators for on-off modulation, a single switch is essentially required for each oscillator. Therefore, when implementing an oscillator array, complex circuitry must be added to control each switch, which increases the complexity of the circuit design and can cause difficulties in actual implementation. Furthermore, since a switch is added to each oscillator, the area of each oscillator may increase due to the switch circuitry, and the circuitry for controlling the switches also contributes to the increased area, which can lead to the disadvantage of reduced efficiency relative to the total area. FIG. 1 is a diagram illustrating a sub-millimeter wave band oscillator with on-off modulation according to the prior art. FIG. 2 is a diagram illustrating the operation of an oscillator according to the prior art. Figure 3 is a diagram illustrating odd mode coupling and even mode coupling. Figure 4 is a diagram illustrating an exemplary coupling network. Figure 5 is a diagram illustrating odd mode impedance and even mode impedance. FIG. 6 is a diagram exemplarily illustrating the process of implementing on-off modulation through excellent-odd mode coupling according to the present embodiment. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. The terms used herein are merely for describing specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Furthermore, the components of the embo