CN205510001U

CN205510001U - 120dB's decay combinatorial circuit is reached in power attenuation of 8mm wave band

Info

Publication number: CN205510001U
Application number: CN201620242928.5U
Authority: CN
Inventors: 张青; 刘宏胜; 倪红香; 胡万云
Original assignee: STAR-WAVE COMMUNICATIONS TECH Corp
Current assignee: STAR-WAVE COMMUNICATIONS TECH Corp
Priority date: 2016-03-28
Filing date: 2016-03-28
Publication date: 2016-08-24
Anticipated expiration: 2026-03-28

Abstract

The utility model relates to a 120dB's decay combinatorial circuit is reached in power attenuation of 8mm wave band, including first attenuator, its input termination 8mm wave band radio frequency incoming signal, its output and a single -pole double -throw's common port links to each other, the first branch road of a single -pole double -throw links to each other with first amplifier input, second branch road and the 2nd single -pole double -throw second branch road link to each other, first amplifier output end links to each other with the first branch road of the 2nd single -pole double -throw, the 2nd single -pole double -throw common port links to each other with second attenuator input, output and the 3rd single -pole double -throw's common port links to each other, the first branch road of the 3rd single -pole double -throw links to each other with second amplifier input, the second branch road links to each other with fourth single -pole double -throw second branch road, second amplifier output end links to each other with the first branch road of fourth single -pole double -throw, fourth single -pole double -throw's common port output 8mm wave band radiofrequency signal. The utility model has the advantages of little volume, undershoot decrease, the high attenuation.

Description

A kind of decay combinational circuit reaching 120dB in the decay of 8mm band power

Technical field

This utility model relates to microwave system integrated technology field, a kind of decay combinational circuit reaching 120dB in the decay of 8mm band power.

Background technology

Attenuator is as the common components of radar microwave system, along with the development of microwave communication, constantly needs high-performance, Miniaturized Integrated Circuit to meet the attenuation requirement that user is the highest in communication system.In order to reach higher attenuation, the most conventional mode is: use the mode meeting the multistage attenuator cascade using frequency range, the drawback of this mode is: spatial separation requires the highest, circuit structure pressure is big, otherwise the decay after cascade deviates from theoretical value, the insertion of the most multistage attenuator, loss increases, thus increases the gain requirement of amplifier in circuit.How to design a kind of small size, filter with low insertion loss, the attenuator of high attenuation have become as technical problem anxious to be resolved.

Utility model content

The purpose of this utility model is to provide the decay combinational circuit reaching 120dB in the decay of 8mm band power of a kind of small size, filter with low insertion loss, high attenuation.

For achieving the above object, this utility model have employed techniques below scheme: a kind of decay at 8mm band power reaches the decay combinational circuit of 120dB, including the first attenuator, its input termination 8mm waveband radio frequency input signal, the common port of its outfan and the first single-pole double-throw switch (SPDT) is connected, first branch road of the first single-pole double-throw switch (SPDT) and the input of the first amplifier are connected, second branch road of the first single-pole double-throw switch (SPDT) and the second branch road of the second single-pole double-throw switch (SPDT) are connected, and the outfan of the first amplifier and the first branch road of the second single-pole double-throw switch (SPDT) are connected；The common port of the second single-pole double-throw switch (SPDT) and the input of the second attenuator are connected, the outfan of the second attenuator and the common port of the 3rd single-pole double-throw switch (SPDT) are connected, first branch road of the 3rd single-pole double-throw switch (SPDT) and the input of the second amplifier are connected, second branch road of the 3rd single-pole double-throw switch (SPDT) and the second branch road of the 4th single-pole double-throw switch (SPDT) are connected, the outfan of the second amplifier and the first branch road of the 4th single-pole double-throw switch (SPDT) are connected, and the common port of the 4th single-pole double-throw switch (SPDT) is as the outfan output 8mm waveband radio frequency signal of decay combinational circuit.

It is the numerical-control attenuator of 30DB that described first attenuator and the second attenuator are operating frequency in 8mm wave band, decay total amount.

Described first single-pole double-throw switch (SPDT), the second single-pole double-throw switch (SPDT), the 3rd single-pole double-throw switch (SPDT), the 4th single-pole double-throw switch (SPDT) are operating frequency switch of isolation >=30dB between 8mm wave band, Insertion Loss≤1dB, and first branch road of four and the second branch road.

Described first amplifier and the second amplifier are operating frequency at 8mm wave band, small-signal gain >=30dB, the amplifier of reverse isolation >=30dB.

As shown from the above technical solution, the beneficial effects of the utility model are: first, traditional method is that attenuator cascade realizes power attenuation, 8mm wave band 120dB power attenuation needs to configure 4 grades at least, and single-stage must realize 30dB attenuation, its insertion loss is superimposed equal to the insertion loss of every grade of attenuator, the single attenuator insertion loss about 4dB of general 8mm wave band, 4 grades of cascade insertion loss about 16dB；And this utility model insertion loss adds first, second, third, fourth single-pole double-throw switch (SPDT) insertion loss (single single-pole double-throw switch (SPDT) insertion loss about 1dB equal to the first attenuator loss (about 4dB), four about 4dB) and plus the second attenuator insertion loss (about 4dB), about 12dB altogether；As can be seen here, in the case of when power is unattenuated, output is certain, number or the gain requirement of this utility model amplifier to using in passage reduce, and are inserted simultaneously into loss little；Second, traditional attenuator cascade realizes the mode of 8mm band power decay 120dB, requires the highest to channel isolation, by conventional engineering experience, chamber to be divided splitted cover board on circuit implementations, circuit structure is complicated, and otherwise after attenuator cascade, attenuation does not reaches 120dB；And this utility model can use narrow slot transmission structure, circuit volume is little, it is not necessary to individually point chamber splitted cover board can realize the high attenuation of 120dB.

Accompanying drawing explanation

Fig. 1 is circuit theory diagrams of the present utility model.

Detailed description of the invention

As shown in Figure 1, a kind of decay combinational circuit reaching 120dB in the decay of 8mm band power, including the first attenuator 1, its input termination 8mm waveband radio frequency input signal, the common port of its outfan and the first single-pole double-throw switch (SPDT) 2 is connected, first branch road of the first single-pole double-throw switch (SPDT) 2 and the input of the first amplifier 3 are connected, second branch road of the first single-pole double-throw switch (SPDT) 2 and the second branch road of the second single-pole double-throw switch (SPDT) 4 are connected, and the outfan of the first amplifier 3 and the first branch road of the second single-pole double-throw switch (SPDT) 4 are connected；The common port of the second single-pole double-throw switch (SPDT) 4 and the input of the second attenuator 5 are connected, the outfan of the second attenuator 5 and the common port of the 3rd single-pole double-throw switch (SPDT) 6 are connected, first branch road of the 3rd single-pole double-throw switch (SPDT) 6 and the input of the second amplifier 7 are connected, second branch road of the 3rd single-pole double-throw switch (SPDT) 6 and the second branch road of the 4th single-pole double-throw switch (SPDT) 8 are connected, the outfan of the second amplifier 7 and the first branch road of the 4th single-pole double-throw switch (SPDT) 8 are connected, and the common port of the 4th single-pole double-throw switch (SPDT) 8 is as the outfan output 8mm waveband radio frequency signal of decay combinational circuit.

It is the numerical-control attenuator of 30DB that described first attenuator 1 and the second attenuator 5 are operating frequency in 8mm wave band, decay total amount.Described first single-pole double-throw switch (SPDT) the 2, second single-pole double-throw switch (SPDT) the 4, the 3rd single-pole double-throw switch (SPDT) the 6, the 4th single-pole double-throw switch (SPDT) 8 is operating frequency switch of isolation >=30dB between 8mm wave band, Insertion Loss≤1dB, and first branch road of four and the second branch road.Described first amplifier 3 and the second amplifier 7 are operating frequency at 8mm wave band, small-signal gain >=30dB, the amplifier of reverse isolation >=30dB.

Below in conjunction with Fig. 1, this utility model is further described.

8mm waveband radio frequency input signal is after the first attenuator 1, the alternative circuit output formed via the first single-pole double-throw switch (SPDT) 2 and the second single-pole double-throw switch (SPDT) 4, after the second attenuator 5, the alternative circuit output 8mm waveband radio frequency output signal finally formed via the 3rd single-pole double-throw switch (SPDT) 6 and the 4th single-pole double-throw switch (SPDT) 8.

When the first attenuator 1 and the second attenuator 5 are set to unattenuated state, and two alternative circuit select first amplifier the 3, second amplifier 7 to work, for the unattenuated state of power respectively；When unattenuated state, only by the first amplifier 3 and the second amplifier 7,8mm waveband radio frequency input signal is amplified；

When the first attenuator 1 and the second attenuator 5 are set to attenuation state, and when two alternative circuit select straight-through road respectively, for power attenuation state.Carry out drawing electric treatment by first amplifier the 3, second amplifier 7 simultaneously, ensure that on amplifier channel, signal will not reflex on straight-through road, add the isolation >=30dB of second, third, fourth, fifth single-pole single-throw switch (SPST) 2,4,6,8 itself, it is ensured that power attenuation is not affected by amplifier branch.When two alternative circuit select straight-through road respectively, be equivalent to power attenuation 60dB, add that the first attenuator 1 and the second attenuator 5 act on, thus realize maximum power attenuation >=120dB.Here, after described straight-through road refers to that 8mm waveband radio frequency input signal enters the first attenuator 1 decay, sequentially enter the second branch road of the first single-pole double-throw switch (SPDT) 2, the second branch road of the second single-pole double-throw switch (SPDT) 4, the second branch road of the second attenuator the 5, the 3rd single-pole double-throw switch (SPDT) 6, the second branch road of the 4th single-pole double-throw switch (SPDT) 8；Being decayed 30 dB by the first attenuator 1, then decay 30 dB through the second attenuator 5, add the first amplifier 3 and the second amplifier 7 does not works, the two each has the gain of 30 dB, therefore, is equivalent to 120 dB that decayed altogether.

In sum, the advantage that this utility model has small size, filter with low insertion loss, high attenuation, it is adaptable to multiple microwave system.

Claims

1. the decay combinational circuit reaching 120dB in the decay of 8mm band power, it is characterized in that: include the first attenuator (1), its input termination 8mm waveband radio frequency input signal, the common port of its outfan and the first single-pole double-throw switch (SPDT) (2) is connected, first branch road of the first single-pole double-throw switch (SPDT) (2) and the input of the first amplifier (3) are connected, second branch road of the first single-pole double-throw switch (SPDT) (2) and the second branch road of the second single-pole double-throw switch (SPDT) (4) are connected, and the outfan of the first amplifier (3) and the first branch road of the second single-pole double-throw switch (SPDT) (4) are connected；The common port of the second single-pole double-throw switch (SPDT) (4) and the input of the second attenuator (5) are connected, the outfan of the second attenuator (5) and the common port of the 3rd single-pole double-throw switch (SPDT) (6) are connected, first branch road of the 3rd single-pole double-throw switch (SPDT) (6) and the input of the second amplifier (7) are connected, second branch road of the 3rd single-pole double-throw switch (SPDT) (6) and the second branch road of the 4th single-pole double-throw switch (SPDT) (8) are connected, the outfan of the second amplifier (7) and the first branch road of the 4th single-pole double-throw switch (SPDT) (8) are connected, the common port of the 4th single-pole double-throw switch (SPDT) (8) is as the outfan output 8mm waveband radio frequency signal of decay combinational circuit.

The decay combinational circuit reaching 120dB in the decay of 8mm band power the most according to claim 1, it is characterised in that: it is the numerical-control attenuator of 30DB that described first attenuator (1) and the second attenuator (5) are operating frequency in 8mm wave band, decay total amount.

The decay combinational circuit reaching 120dB in the decay of 8mm band power the most according to claim 1, it is characterized in that: described first single-pole double-throw switch (SPDT) (2), the second single-pole double-throw switch (SPDT) (4), the 3rd single-pole double-throw switch (SPDT) (6), the 4th single-pole double-throw switch (SPDT) (8) are operating frequency at 8mm wave band, the switch of isolation >=30dB between Insertion Loss≤1dB, and first branch road of four and the second branch road.

The decay combinational circuit reaching 120dB in the decay of 8mm band power the most according to claim 1, it is characterized in that: described first amplifier (3) and the second amplifier (7) are operating frequency at 8mm wave band, small-signal gain >=30dB, the amplifier of reverse isolation >=30dB.