KR102073576B1 - Aia type rf sensor using radio wave feedback - Google Patents

Abstract

The present invention relates to an AIA-type RF sensor and, more specifically, to an AIA-type RF sensor using radio wave feedback. The purpose of the present invention is to make an AIA-type RF sensor compact to solve the problem. The present invention transmits and receives a signal through a first slot antenna and a second slot antenna, and selects an oscillation frequency of an oscillation signal to reduce the length of a line, thereby making the AIA-type RF sensor compact. In addition, the present invention transmits and receives a signal in a state of dividing the first slot antenna transmitting an oscillation signal and the second slot antenna receiving a shifted oscillation signal to reduce power loss, thereby increasing the reception capability of the AIA-RF sensor. Moreover, the present invention feeds a signal output from the output terminal of an amplifier back to the input terminal of the amplifier through a radio wave feedback loop formed in a space between the first slot antenna and the second slot antenna to meet oscillation conditions so as to omit a feedback oscillator, thereby making the AIA-type RF sensor compact. Furthermore, the present invention can reduce the phase noise by fixing the phase of the oscillation signal through adjustment of the length of a first microstrip line and a second microstrip line.

Description

AIA RF Sensor Using Radio Feedback {AIA TYPE RF SENSOR USING RADIO WAVE FEEDBACK}

The present invention relates to an AIA type RF sensor, and more particularly, to an AIA type RF sensor using radio wave feedback.

In general, an AIA RF sensor emits an oscillation signal in a free space through a single antenna, receives a high frequency signal reflected back from an object and shifted by the Doppler frequency, and receives an oscillation signal through a nonlinear characteristic of a transistor. And mixing the high frequency signals returned by the transition to detect frequency and phase differences between the oscillation signal and the high frequency signals returned by the transition.

However, in the conventional AIA Doppler radar, the length of the lines is increased to prevent system instability due to frequency interference between the antenna for transmitting and receiving the signal and the resonator for determining the oscillation frequency of the oscillating signal. There is a problem that grows.

In addition, by transmitting and receiving the oscillation signal and the transitioned high frequency signal through a single antenna, when a high frequency signal is received, the frequency difference between the oscillation signal and the received signal is increased, resulting in power loss, and thus the RF sensor's reception ability There is a problem of deterioration.

In addition, there is a problem in that the size of the RF sensor is increased by including a feedback line for returning the signal input to the transistor to generate the oscillation signal from the output to the input with a gain.

1. Korean Patent Publication No. 10-1105505 (Published June 1, 2011) 2. Korean Registered Patent No. 10-1469720 (Dec. 5, 2014)

The present invention is to solve the above problems, it is an object of the miniaturization of the size of the AIA RF sensor.

AIA RF sensor using a radio wave feedback according to an embodiment of the present invention for achieving the above object is a first slot antenna for transmitting an oscillation signal in free space, spaced apart from a predetermined distance from the first slot antenna And a second slot antenna for receiving an oscillation signal transitioned from the free space, an input terminal of which is connected to one side of the second slot antenna, an output terminal of which is connected to one side of the first slot antenna, and generates an oscillation signal. And an oscillation signal transitioned from the free space and the oscillation signal are mixed in the space spaced apart from the predetermined distance between the amplifier and the first slot antenna and the second slot antenna to detect a frequency and phase difference. It characterized in that it comprises a full-wave feedback loop for feeding back the signal of the output terminal to the input terminal.

In addition, the first slot antenna is formed of a dielectric material, the first slot for transmitting the oscillation signal, is coupled to one side of the first slot, is excited and connected to the first slot, the predetermined width and length adjustment A first T-stub for selecting an oscillation frequency of the oscillation signal through the first T-stub, and connecting the first T-stub and the output terminal to a preset length and adjusting a phase of the oscillation signal through the preset length adjustment; It characterized in that it comprises one microstrip line.

In addition, the second slot antenna is formed of a dielectric, the second slot for receiving the transitional oscillation signal, coupled to one side of the second slot, is excited and connected to the second slot, a predetermined width and A second T-stub for selecting the oscillation frequency of the oscillation signal through length adjustment, the second T-stub and the input terminal are connected to a preset length, and the phase of the oscillation signal is adjusted through the preset length adjustment. It characterized in that it comprises a second microstrip line.

In addition, the propagation feedback loop is adjusted according to the predetermined distance, it characterized in that the oscillation conditions of the amplifier by adjusting the feedback amount.

As described above, the present invention transmits and receives a signal through the first slot antenna and the second slot antenna, and selects the oscillation frequency of the oscillation signal, thereby reducing the length of the line and miniaturizing the size of the AIA RF sensor. There is an effect that can be done.

In addition, by transmitting and receiving a signal by dividing the first slot antenna for transmitting the oscillation signal and the second slot antenna for receiving the shifted oscillation signal, the power loss can be reduced and the reception capability of the AIA RF sensor can be improved. There is.

In addition, a feedback resonator is omitted by omitting the feedback resonator by feeding the signal output from the output terminal of the amplifier to the input terminal of the amplifier through a propagation feedback loop formed in a space spaced between the first slot antenna and the second slot antenna. It can reduce the size of the RF sensor.

In addition, by fixing the phase of the oscillation signal by adjusting the length of the first microstrip line and the second microstrip line, the phase noise can be reduced.

1 is a schematic diagram of an AIA RF sensor using a radio feedback according to an embodiment of the present invention.
2 is a perspective view of an AIA RF sensor using a radio feedback according to an embodiment of the present invention.
3 is a view for explaining the feedback amount of the radio wave feedback loop according to the present invention.
4 is a diagram illustrating an oscillation frequency selection of an oscillation signal according to the present invention.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the drawings, similar reference numerals are used for similar elements. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention.

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art.

Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the drawings will be described in detail with respect to the AIA RF sensor using a radio feedback according to an embodiment of the present invention. 1 is a schematic diagram of an AIA RF sensor using a radio feedback according to an embodiment of the present invention. 2 is a perspective view of an AIA RF sensor using a radio feedback according to an embodiment of the present invention. 3 is a view for explaining the feedback amount of the radio wave feedback loop according to the present invention. 4 is a diagram illustrating an oscillation frequency selection of an oscillation signal according to the present invention. The following description of the well-known matter is omitted or simplified to clarify the gist of the present invention.

1 to 2, the AIA RF sensor 1 using the radio wave feedback may transmit an oscillation signal in a free space, and may receive a shifted oscillation signal reflected back from the free space, that is, In addition, the oscillation signal and the oscillation signal transitioned from the free space may be mixed to detect a frequency and phase difference. The AIA type RF sensor 1 using the propagation feedback may include a first slot antenna 100, a second slot antenna 200, an amplifier 300, and a propagation feedback loop 400.

One side of the first slot antenna 100 is connected to the output terminal of the amplifier 300, thereby transmitting the oscillation signal generated from the amplifier 300 to the free space without power loss. The first slot antenna 100 may include a first slot 110, a first T-stub 120, and a first microstrip line 130.

The first slot 110 may be formed of a dielectric material and may be coupled to the first T-stub 120 through microstrip coupling. The first slot 110 may adjust the feedback amount of the propagation feedback loop 400 by controlling the dielectric constant and thickness.

The first slot 110 may be excited with the first T-stub 120 to receive the oscillation signal from the amplifier 300 and transmit the oscillation signal in free space.

The first T-stub 120 may be coupled to one side of the first slot 110, and may be excited and connected to the first slot 110. The first T-stub 120 may select to maximize the oscillation output of the oscillation signal through a preset width and length adjustment. Here, the preset width and length adjustment may be adjusted according to the dielectric constant and thickness of the first slot 110.

가 되어야 하며, 발진 신호의 위상을 고정함으로써, 위상잡음을 줄일 수 있는 효과가 있다.The first microstrip line 130 may connect the output terminal of the first T-stub 120 and the amplifier 300 at a predetermined distance, and may adjust the phase of the oscillation signal through a preset length adjustment. Here, the overall feedback loop phase of the oscillation signal is

Since the phase of the oscillation signal is fixed, phase noise can be reduced.

The second slot antenna 200 may be installed to be spaced apart from the first slot antenna 100 by a predetermined distance d and may receive an oscillation signal transitioned from a free space. The second slot antenna 200 may be connected to an input terminal of the amplifier 300 so that the second slot antenna 200 may provide the received transitioned oscillation signal to the amplifier 300 without power loss. The second slot antenna 200 may include a second slot 210, a second T-stub 220, and a second microstrip line 230.

The second slot 210 may be formed of a dielectric material and may be coupled to the second T-stub 220 through microstrip coupling. The second slot 210 may adjust the feedback amount of the propagation feedback loop 400 by controlling the dielectric constant and thickness.

The second slot 210 may receive the shifted oscillation signal, and may provide the oscillation signal which is excited with the second T-stub 220 to the input terminal of the amplifier 300.

The second T-stub 220 may be coupled to one side of the second slot 210 and may be excited and connected to the second slot 210. The second T-stub 220 may select to maximize the oscillation output of the oscillation signal through a preset width and length adjustment. Here, the preset width and length adjustment may be adjusted according to the dielectric constant and thickness of the second slot 210.

가 되어야 하며, 발진 신호의 위상을 고정함으로써, 위상잡음을 줄일 수 있는 효과가 있다.The second microstrip line 230 may connect the input terminal of the second T-stub 220 and the amplifier 300 at a predetermined distance, and may adjust the phase of the oscillation signal through a preset length adjustment. Here, the overall feedback loop phase of the oscillation signal is

Since the phase of the oscillation signal is fixed, phase noise can be reduced.

The amplifier 300 may have an input terminal connected to one side of the second slot antenna 200, an output terminal connected to one side of the first slot antenna 100, generate an oscillation signal, and receive a transition from free space. Nonlinearities can be mixed between the signal and the oscillation signal to detect frequency and phase differences.

The amplifier 300 may be implemented as a single device such as a transistor, and as the bias is applied and the oscillation condition is satisfied, the amplifier 300 may repeat the feedback operation through the propagation feedback loop 400 to generate the oscillation signal. Here, the oscillation frequency of the oscillation signal may be selected through the first slot antenna 100 and the second slot antenna 200.

The oscillation condition of the amplifier 300 may be satisfied when the amplification degree of the amplifier 300 is K, when the feedback amount of the propagation feedback loop 400 is greater than 1 / K, and may oscillate as the oscillation condition is satisfied. . The amplifier 300 may include a connection pad 310.

The connection pad 310 may be connected to one side of the amplifier 300, may supply a bias to the amplifier 300, and a signal in which DC power is cut off among signals corresponding to a frequency and phase difference through a capacitor (not shown). Can be detected.

The capacitor may be a small chip capacitor, and may have a value of 2 to 10 uf to reduce the loss in consideration of the frequency of the detection signal. Here, the capacitor is described as a chip capacitor having a value of 2 to 10 uf, but may be replaced if the DC power is cut off and the signal loss is small.

Referring to FIG. 3, in the propagation feedback loop 400, a feedback amount S21 (Db) may be adjusted according to a preset distance d between the first slot antenna 100 and the second slot antenna 200. The oscillation condition of the amplifier 300 may be satisfied by adjusting the feedback amount. Here, the feedback amount may increase as the predetermined distance is shorter.

The predetermined distance between the first slot antenna 100 and the second slot antenna 200 is a feedback amount larger than the inverse of the amplification degree (1 / K) of the amplification degree of the amplifier 300 by 10-20% or more. It can be adjusted to have, and the longer the predetermined distance the lower the feedback amount can be.

)이내인 것이 바람직할 수 있으며, 제 1 슬롯(110) 및 제 2 슬롯(210)의 유전율 및 두께에 따라 증폭기(300)의 발진 조건이 충족될 수 있도록 조절될 수 있고, 제 1 슬롯안테나(100) 및 제 2 슬롯안테나(200) 간의 거리조절을 통해 전파궤환루프(400)의 궤환량을 조절함으로써, mm대역의 높은 주파수대역에서 선택적으로 궤환량을 조절할 수 있다.The preset distance is half wavelength (

It may be preferable that the oscillation conditions of the amplifier 300 can be met according to the dielectric constant and thickness of the first slot 110 and the second slot 210, and the first slot antenna ( 100) and the feedback amount of the propagation feedback loop 400 by adjusting the distance between the second slot antenna 200, it is possible to selectively adjust the feedback amount in the high frequency band of mm band.

는 투과(투과계수)하고, 발진 주파수 외의 주파수는 반사(반사계수)함으로써, 선택될 수 있으며, 투과된 발진 주파수는 전파궤환루프(400)를 통해 증폭기(300)의 입력단으로 제공됨으로써, 선택된 발진 주파수의 발진을 유도할 수 있다.Referring to FIG. 4, an oscillation frequency of an oscillation signal is an oscillation frequency of the first slot antenna 100 and the second slot antenna 200, which may be spaced apart by half wavelength distance.

Is transmitted (transmission coefficient), and a frequency other than the oscillation frequency may be selected by reflection (reflection coefficient), and the transmitted oscillation frequency is provided to the input terminal of the amplifier 300 through the propagation feedback loop 400, thereby selecting the selected oscillation. It can induce oscillation of frequency.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

1: AIA RF Sensor Using Radio Feedback
100: first slot antenna
110: first slot
120: first T-stub
130: first microstrip line
200: second slot antenna
210: second slot
220: second T-stub
230: second microstrip line
300: amplifier
310: connection pad
400: full-wave feedback loop

Claims (4)

A first slot antenna for transmitting an oscillation signal in free space;
A second slot antenna spaced apart from the first slot antenna by a predetermined distance and receiving an oscillation signal transitioned from the free space;
An input terminal is connected to one side of the second slot antenna, an output terminal is connected to one side of the first slot antenna, generates an oscillation signal, and mixes the oscillation signal and the oscillation signal which are transitioned from the free space, in frequency and phase. An amplifier for detecting the difference; And
And a propagation feedback loop formed in a space spaced by the predetermined distance between the first slot antenna and the second slot antenna, and returning a signal of the output terminal to the input terminal.
The first slot antenna
A first slot formed of a dielectric and transmitting the oscillation signal,
A first T-stub coupled to one side of the first slot, excited and connected to the first slot, and configured to select an oscillation frequency of the oscillation signal through a preset width and length adjustment;
An AIA method using a radio feedback, wherein the first T-stub and the output terminal are connected to each other at a predetermined length, and the first microstrip line adjusts the phase of the oscillation signal through the preset length adjustment. RF sensor. delete The method of claim 1,
The second slot antenna
A second slot formed of a dielectric and configured to receive the shifted oscillation signal,
A second T-stub coupled to one side of the second slot, excited and connected to the second slot, and configured to select an oscillation frequency of the oscillation signal through a preset width and length adjustment;
And a second microstrip line connecting the second T-stub and the input terminal to a preset length and adjusting the phase of the oscillation signal through the preset length adjustment. RF sensor. The method of claim 1,
The propagation feedback loop is controlled according to the preset distance, and the AIA RF sensor using the propagation feedback characterized in that to satisfy the oscillation conditions of the amplifier by adjusting the feedback amount.

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