High-isolation double-coupling output low-intermodulation attenuator

Abstract

The invention discloses a high-isolation double-coupling output low-intermodulation attenuator which comprises a body, a first transmission line and a pair of second transmission lines are arranged in the body, the pair of second transmission lines are arranged above the first transmission line in a bilateral symmetry mode, and a matched resistor connected with one end of each second transmission line is arranged in the body. A coupling output end connected with one end, which is not connected with the matching resistor, of the second transmission line is arranged outside the body, the second transmission line is formed by sequentially connecting a plurality of sections of air strip lines in a step shape, and a signal input end and a low intermodulation load which are respectively connected with two ends of the first transmission line are arranged at two ends of the body. According to the attenuator, the relation among the directivity, the coupling degree and the isolation of the directional coupler is fully utilized, and the two multi-section air strip line broadband couplers are connected in series and share the same cavity, so that the high-isolation coupling output low-intermodulation directional coupler is realized.

Description

Technical Field

[0001] The present application relates to the technical field of attenuators, and in particular to a high-isolation dual-coupled output low intermodulation attenuator. Background Art

[0002] In modern communication systems, dedicated low intermodulation attenuators are usually wound with low intermodulation cables. The frequency response characteristics of the cables determine that the frequency response characteristic curve of such dedicated low intermodulation attenuators is not as flat as that of lumped parameter attenuators. In practical applications, the characteristics of low intermodulation cables and directional couplers can be used to form low intermodulation attenuators with flat frequency response characteristics. Currently, most conventional low intermodulation attenuators are in the form of single-port input and single-ended output. With the development of communication technology, people's demand for single-input multiple-output and multiple-input and output devices is becoming increasingly urgent, so it is necessary to redesign the circuit structure to meet the needs of practical applications. Summary of the invention

[0003] The object of the present invention is to provide a high-isolation dual-coupled output low intermodulation attenuator to overcome the deficiencies in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The embodiment of the present application discloses a high-isolation dual-coupled output low intermodulation attenuator, which is characterized by comprising a main body, wherein a first transmission line and a pair of second transmission lines are arranged in the main body, the pair of second transmission lines are symmetrically arranged above the first transmission line, a matching resistor connected to one end of the second transmission line is arranged in the main body, a coupling output terminal connected to an end of the second transmission line that is not connected to the matching resistor is arranged outside the main body, the second transmission line is formed by connecting multiple sections of air strip lines in a step-like manner in sequence, and signal input terminals and low intermodulation loads respectively connected to the two ends of the first transmission line are provided at both ends of the main body.

[0006] Preferably, in the above-mentioned high-isolation dual-coupled output low intermodulation attenuator, the second transmission line is formed by four sections of air strip lines connected in sequence in a step-like manner.

[0007] Preferably, in the above-mentioned high-isolation dual-coupled output low intermodulation attenuator, the first transmission line and the second transmission line are both arranged horizontally.

[0008] Preferably, in the above-mentioned high-isolation dual-coupled output low intermodulation attenuator, the first transmission line and the second transmission line are separated by an insulating support.

[0009] Compared with the prior art, the advantages of the present invention are:

[0010] Taking full advantage of the relationship between the directionality, coupling and isolation of the directional coupler, two multi-section air stripline broadband couplers are connected in series and share the same cavity to realize a high-isolation coupled output low intermodulation directional coupler; different from the conventional low intermodulation attenuator realized by a single low intermodulation load and a single coupler, the low intermodulation load is connected with the above-mentioned directional coupler to form a dual-coupled output low intermodulation attenuator that shares a low intermodulation load and has high mutual isolation performance. Applying it in a multi-input and output attenuator module can effectively reduce the number of low intermodulation loads used, reduce the complexity and cost of the module, and at the same time, due to the high isolation of the two coupled output signals on a single attenuator, it also effectively reduces the mutual interference between subsequent connected circuit units, improving the anti-interference ability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, it is easy to obtain other drawings based on these drawings without creative work.

[0012] Figure 1 Shown is a schematic structural diagram of a high isolation dual-coupled output low intermodulation attenuator in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0013] The following will describe the technical solutions in the embodiments of the present invention in detail in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] Ginseng Figure 1 As shown, the high-isolation dual-coupled output low intermodulation attenuator in this embodiment includes a main body 1, a first transmission line 2 and a pair of second transmission lines 3 are arranged in the main body 1, the pair of second transmission lines 3 are symmetrically arranged above the first transmission line 2, a matching resistor 4 connected to one end of the second transmission line 3 is arranged in the main body 1, a coupling output terminal 5 connected to the end of the second transmission line 3 not connected to the matching resistor 4 is arranged outside the main body 1, the second transmission line 3 is formed by a plurality of air strip lines 6 connected in sequence in a step-like manner, and signal input terminals 7 and low intermodulation loads 10 respectively connected to the two ends of the first transmission line 2 are provided at both ends of the main body 1.

[0015] Furthermore, the second transmission line 3 is formed by four air strip lines 6 connected in sequence in a step-like manner.

[0016] Furthermore, the first transmission line 2 and the second transmission line 3 are both arranged horizontally.

[0017] Furthermore, the first transmission line 2 and the second transmission line 3 are separated by an insulating support 9 .

[0018] In this technical solution, the relationship between the directivity, coupling degree and isolation degree of the directional coupler is fully utilized, and two multi-section air stripline broadband couplers are connected in series and share the same cavity to realize a high-isolation coupled output low intermodulation directional coupler; different from the conventional low intermodulation attenuator realized by a single low intermodulation load and a single coupler, the low intermodulation load is connected with the above-mentioned directional coupler to form a dual-coupled output low intermodulation attenuator that shares a low intermodulation load and has high mutual isolation performance. Applying it in a multi-input and output attenuator module can effectively reduce the number of low intermodulation loads used, reduce the complexity and cost of the module, and at the same time, due to the high isolation of the two coupled output signals on a single attenuator, it also effectively reduces the mutual interference between subsequent connected circuit units, thereby improving the anti-interference ability of the entire system.

[0019] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0020] The above is only a specific implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A high isolation dual coupled output low intermodulation attenuator, characterized in that: The invention comprises a main body, wherein a first transmission line and a pair of second transmission lines are arranged in the main body, the pair of second transmission lines are symmetrically arranged above the first transmission line, a matching resistor connected to one end of the second transmission line is arranged in the main body, a coupling output terminal connected to one end of the second transmission line not connected to the matching resistor is arranged outside the main body, the second transmission line is formed by connecting a plurality of air strip lines in a step-like manner in sequence, and signal input terminals and low intermodulation loads respectively connected to the two ends of the first transmission line are arranged at two ends of the main body.

2. A high isolation dual-coupled output low intermodulation attenuator according to claim 1, characterized in that: The second transmission line is formed by connecting four air strip lines in sequence in a step-like manner.

3. The high isolation dual-coupled output low intermodulation attenuator according to claim 1, characterized in that: The first transmission line and the second transmission line are both arranged horizontally.

4. The high isolation dual-coupled output low intermodulation attenuator according to claim 1, characterized in that: The first transmission line is separated from the second transmission line by an insulating support.

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