Bidirectional coupler suitable for medium-short wave

Abstract

The utility model relates to the technical field of electronic circuits, in particular to a bi-directional coupler suitable for medium and short waves, which comprises two groups of magnet ring inductors, two groups of n-shaped attenuators and two capacitors, radio frequency signals are respectively subjected to forward coupling and reverse coupling by the two groups of magnet ring inductors, and the two capacitors are respectively matched with the two groups of magnet ring inductors. And the n-shaped attenuators are used for processing and selecting corresponding radio-frequency signals in medium and short wave bands, one n-shaped attenuator is used for adjusting the size of forward coupling signals and outputting the forward coupling signals, and the other n-shaped attenuator is used for adjusting the size of reverse coupling signals and outputting the reverse coupling signals. The size of the bi-directional coupler is reduced, the coupler is convenient to install, the frequency application range of the coupler is widened, the coupler can be used in multiple frequency bands of medium waves and short waves, the consistency is high, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field especially in the communication field of medium, short wave transmitter, concretely is a kind of double directional coupler suitable for medium short wave. BACKGROUND

[0002] Double directional coupler is a kind of key passive device in radio frequency (RF) and microwave communication system, it can measure the power of forward and reverse transmission signals simultaneously.In medium short wave frequency band, the application of double directional coupler is particularly important, because this frequency band covers the fields of broadcasting, amateur radio and some military communications.Due to the wide range of medium short wave frequency (about 300kHz to 30MHz), it is necessary to consider the performance parameters such as frequency response, self volume when designing a high-efficiency and stable double directional coupler.

[0003] The prior art has the following shortcomings:

[0004] 1) Medium short wave frequency band covers a large frequency range, and traditional coupler may not maintain consistent performance throughout the frequency band.Especially at the medium frequency end, it becomes more difficult to achieve good matching and high efficiency.

[0005] 2) In order to accurately separate forward and reverse signals, the coupler must have excellent consistency and high isolation.This requires precise design and manufacturing process of the coupling structure.

[0006] 3) With the trend of miniaturization of electronic equipment, higher requirements are put forward for the coupler, that is, to reduce the volume and cost while ensuring performance, so as to facilitate integration into more compact systems.Current branch line coupler has large size for medium short wave frequency band, and it is difficult to achieve ideal wideband characteristics.The λ / 4 transmission line transformer is complex in design, especially when the frequency is reduced, the physical size becomes very large, which is not conducive to practical application. CONTENT OF THE UTILITY MODEL

[0007] The utility model provides a kind of double directional coupler suitable for medium short wave, reduce the volume of double directional coupler and facilitate installation, widen the frequency use range of coupler, so that medium wave, short wave multiple frequency band can be used, consistency is high, reduce production cost.

[0008] In order to realize the purpose of the utility model, the technical scheme adopted is: a kind of double directional coupler suitable for medium short wave, including two groups of magnetic ring inductance, two groups of Π type attenuator and two capacitors, radio frequency signal is coupled forward and reverse by two groups of magnetic ring inductance respectively, two capacitors are matched with two groups of magnetic ring inductance respectively, for processing and selecting corresponding radio frequency signal in medium short wave band, a group of Π type attenuator is used to adjust the size of forward coupling signal and output, another group of Π type attenuator is used to adjust the size of reverse coupling signal and output.

[0009] As an optimization scheme of the utility model, the double directional coupler suitable for medium and short waves further comprises two resistors, the two resistors comprise a fifth resistor R5 and a sixth resistor R6, the two groups of magnetic ring inductors comprise a first magnetic ring inductor L1 and a second magnetic ring inductor L2, the two capacitors comprise a first capacitor C1 and a second capacitor C2, the radio frequency input signal line passes through the first magnetic ring inductor L1, the 1 port of the first magnetic ring inductor L1 is grounded, and the radio frequency input signal is coupled to the fifth resistor R5 from the 2 port of the first magnetic ring inductor L1; the 1 port of the second magnetic ring inductor L2 is grounded, the 2 port of the second magnetic ring inductor L2 is connected with the radio frequency input signal line, one end of the fifth resistor R5 and the sixth resistor R6 is grounded, and the signal line between the fifth resistor R5 and the sixth resistor R6 passes through the second magnetic ring inductor L2, and the signal is transmitted onto the signal line through space coupling; the signal is filtered through the first capacitor C1 in series, and then is forwardly coupled and output through a group of Π type attenuators; the signal is filtered through the second capacitor C2 in series, and then is reversely coupled and output through another group of Π type attenuators.

[0010] As an optimization scheme of the utility model, the double directional coupler suitable for medium and short waves further comprises two resistors, the two resistors comprise a fifth resistor R5 and a sixth resistor R6, the two groups of magnetic ring inductors comprise a first magnetic ring inductor L1 and a second magnetic ring inductor L2, the two capacitors comprise a first capacitor C1 and a second capacitor C2, the radio frequency input signal line passes through the first magnetic ring inductor L1, the 1 port of the first magnetic ring inductor L1 is grounded, and the radio frequency input signal is coupled to the fifth resistor R5 from the 2 port of the first magnetic ring inductor L1; the 1 port of the second magnetic ring inductor L2 is grounded, the 2 port of the second magnetic ring inductor L2 is connected with the radio frequency input signal line, one end of the fifth resistor R5 and the sixth resistor R6 is grounded, and the signal line between the fifth resistor R5 and the sixth resistor R6 passes through the second magnetic ring inductor L2, and the signal is transmitted onto the signal line through space coupling; the signal is filtered through the first capacitor C1 in series, and then is forwardly coupled and output through a group of Π type attenuators; the signal is filtered through the second capacitor C2 in series, and then is reversely coupled and output through another group of Π type attenuators.

[0011] As an optimization scheme of the utility model, the inductance values of the first magnetic ring inductor L1 and the second magnetic ring inductor L2 are equal.

[0012] As an optimization scheme of the utility model, the capacitance values of the first capacitor C1 and the second capacitor C2 are equal.

[0013] The utility model has positive effect: 1) the utility model passes through adopting two groups of magnetic ring inductors, two capacitors and two groups of Π type attenuators, effectively reduces the volume of double directional coupler, makes it more convenient to install and use.

[0014] 2) The double directional coupler of the utility model shows high consistency in forward coupling and reverse coupling, ensures accurate separation and transmission of radio frequency signals, can flexibly cover multiple frequency bands of medium wave and short wave by accurately adjusting inductance and capacitance value of magnetic ring inductance, and realizes excellent directivity and isolation within these frequency bands. In addition, the forward and reverse coupling signals are adjusted by adopting Π type attenuator, which further enhances the consistency and reliability of signal processing;

[0015] 3) The double directional coupler of the utility model is greatly reduced in size, reduces cost, and is more in line with the development trend of current electronic equipment miniaturization and integration. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described in detail below in combination with the drawings and specific embodiments.

[0017] Figure 1 It is the circuit principle diagram of the utility model embodiment. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the patent embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment.

[0019] The following description of at least one exemplary embodiment is merely illustrative in nature, and not intended to limit the present utility model and its application or use in any way. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0020] It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the utility model.

[0021] Unless otherwise specified, the relative arrangement, numerical expression and numerical value of the components and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be clear that the size of each part shown in the drawings is not drawn in proportion to the actual proportion. The technology, method and equipment known to those skilled in the art may not be discussed in detail, and in all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other example values of the exemplary embodiments can have different values.

[0022] As Figure 1The utility model discloses a kind of double directional couplers suitable for medium-short wave, including two groups of magnetic ring inductance, two capacitors, two groups of Π attenuator consisting of 6 resistors, two 50Ω resistors.Radio frequency input signal line passes from first magnetic ring inductance L1, the 1 port of first magnetic ring inductance L1 is grounded, and radio frequency input signal is coupled from the 2 port of first magnetic ring inductance L1 to fifth resistance R5;The 1 port of second magnetic ring inductance L2 is grounded, and the 2 port of second magnetic ring inductance L2 is connected with radio frequency input signal line, and one end of fifth resistance R5 and sixth resistance R6 is grounded, and signal line between fifth resistance R5 and sixth resistance R6 passes second magnetic ring inductance L2, and signal is transmitted on signal line by space coupling;Signal is respectively filtered by series first capacitor C1, then by first resistance R1, third resistance R3, fourth resistance R4 Π attenuator formed and is forward coupled output;Signal is respectively filtered by series second capacitor C2, then by second resistance R2, seventh resistance R7, eighth resistance R8 Π attenuator formed and is reverse coupled output.

[0023] The inductance of first magnetic ring inductance L1 and second magnetic ring inductance L2 is 100mH, 100mH respectively.Radio frequency signal is coupled forward coupling and reverse coupling by 2 groups of magnetic ring inductance respectively, and the coupling degree is adjusted by adjusting the inductance of magnetic ring inductance.

[0024] First capacitor C1 and second capacitor C2 are 1uf, for the radio frequency signal of corresponding frequency by medium-short wave.

[0025] The resistance of first resistance R1 and second resistance R2 is 18Ω, and the resistance of third resistance R3, fourth resistance R4, fifth resistance R5, sixth resistance R6, seventh resistance R7, eighth resistance R8 is 300Ω, 300Ω, 50Ω, 50Ω, 300Ω, 300Ω respectively, and the two 50Ω grounding resistors at both ends of magnetic ring are used for matching the radio frequency system of 50Ω impedance.Two groups of magnetic ring inductance are used for adjusting the coupling degree of double directional coupler.

[0026] The above specific embodiments, the purpose, technical scheme and beneficial effects of the utility model are further described in detail, and it should be understood that the above description is only a specific embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A dual directional coupler suitable for use with medium and short wave, characterized in that: The radio frequency signal is forward coupled and reverse coupled by the two groups of magnetic loop inductors respectively, and the two capacitors are used for processing and selecting corresponding radio frequency signals in the medium and short wave bands in cooperation with the two groups of magnetic loop inductors, one group of Π attenuators is used for adjusting the size of the forward coupled signal and outputting, and the other group of Π attenuators is used for adjusting the size of the reverse coupled signal and outputting.

2. A dual directional coupler suitable for use with medium and short wave as claimed in claim 1, wherein: The double directional coupler suitable for medium and short waves also includes two resistors, two groups of magnetic loop inductors, two capacitors, and a radio frequency input signal line. The two resistors include a fifth resistor R5 and a sixth resistor R6, the two groups of magnetic loop inductors include a first magnetic loop inductor L1 and a second magnetic loop inductor L2, and the two capacitors include a first capacitor C1 and a second capacitor C2. The radio frequency input signal line passes through the first magnetic loop inductor L1, the 1 port of the first magnetic loop inductor L1 is grounded, and the radio frequency input signal is coupled from the 2 port of the first magnetic loop inductor L1 to the fifth resistor R5. The 1 port of the second magnetic loop inductor L2 is grounded, the 2 port of the second magnetic loop inductor L2 is connected with the radio frequency input signal line, one end of the fifth resistor R5 and the sixth resistor R6 is grounded, and the signal line between the fifth resistor R5 and the sixth resistor R6 passes through the second magnetic loop inductor L2 to transmit the signal to the signal line by space coupling. The signal is filtered by the first capacitor C1 in series and then output by forward coupling through one group of Π attenuators. The signal is filtered by the second capacitor C2 in series and then output by reverse coupling through the other group of Π attenuators.

3. A dual directional coupler suitable for use with medium and short wave according to claim 2, characterized in that: One group of Π attenuators includes a first resistor R1, a third resistor R3, and a fourth resistor R4, and the other group of Π attenuators includes a second resistor R2, a seventh resistor R7, and an eighth resistor R8. One end of the first resistor R1 is connected with one end of the first capacitor C1 and one end of the fourth resistor R4 respectively, the other end of the fourth resistor R4 is grounded, one end of the third resistor R3 is connected with the other end of the first resistor R1, and the other end of the third resistor R3 is grounded. One end of the second resistor R2 is connected with one end of the second capacitor C2 and one end of the seventh resistor R7 respectively, the other end of the seventh resistor R7 is grounded, one end of the eighth resistor R8 is connected with the other end of the second resistor R2, and the other end of the eighth resistor R8 is grounded.

4. A dual directional coupler suitable for use with medium and short wave according to claim 3, characterized in that: The inductance values of the first magnetic loop inductor L1 and the second magnetic loop inductor L2 are equal.

5. A dual directional coupler suitable for use with medium and short wave as claimed in claim 4, wherein: The capacitance values of the first capacitor C1 and the second capacitor C2 are equal.

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