A kind of 3dB electric bridge
[technical field]
The utility model relates to electric bridge, particularly, relates to a kind of 3dB electric bridge.
[background technology]
3dB electric bridge is also same frequency combiner, is passive device conventional in communication system, especially at radio frequency.In microwave circuit and system, be widely used, it can along on a certain directions of transmission line to through-put power continuous sampling, an input signal can be divided into two constant amplitudes and there is the signal of 90 degree phase differences each other.3dB electric bridge plays an important role to base station signal He road in indoor covering system, is mainly used in many signals and closes road, improves the utilance of output signal.
Traditional 3dB electric bridge frequency band is narrower, generally can only receive the signal between 800-2500MHz frequency range, can only support one to two standard, compatible poor, and third order intermodulation is undesirable, and isolation is lower, and power margin is less, generally only has 200W.
Therefore, need that a kind of compatibility is good, third order intermodulation is less, isolation is high badly, the 3dB electric bridge that power margin is large.
[summary of the invention]
The purpose of this utility model is to provide the 3dB electric bridge that a kind of compatibility is good, third order intermodulation is little, isolation is high, power margin is large.
An aspect of the present utility model, provides a kind of 3dB electric bridge, comprises base plate, some wallboards and cover plate, and described some wallboards and base plate form a cavity, and described cover plate covers the opening of cavity.The first wallboard in described some wallboards is provided with first signal input adapter, secondary signal input adapter, and the second wallboard in described some wallboards is provided with first signal out splice going splice, secondary signal out splice going splice; Described the first wallboard is relative with the second wallboard, and first signal out splice going splice is relative with first signal input adapter, and secondary signal out splice going splice is relative with secondary signal input adapter.Built-in the first coupling line of described cavity and the second coupling line, described the first coupling line is identical with the second coupling line shape, the two ends of every coupling line are respectively equipped with kink round about, the top of the kink at described the first coupling line two ends is electrically connected first signal input adapter and secondary signal out splice going splice with compression joint type respectively, and the top of the two ends kink of described the second coupling line is electrically connected secondary signal input adapter and first signal out splice going splice with compression joint type respectively.Described inside cavity is provided with upper spacer medium for separating described cover plate and the first coupling line, for separating the spacer medium of the first coupling line and the second coupling line, for separating the lower spacer medium of the second coupling line and base plate.
In a preferred version, described plate inner surface is provided with some projections of the base plate towards the second coupling line, and described base plate projection is positioned at described the second coupling line below; Described cover plate lower surface is provided with some projections of the cover plate towards the first coupling line, and described cover plate projection is positioned at the first coupling line top, and longitudinally corresponding on same straight line one by one with the described projection of described backplate surface.
In a preferred version, the mid portion of described the first coupling line is the first linkage section and the first coupled section, and the mid portion of described the second coupling line is the second linkage section and the second coupled section; The first coupled section and the second coupled section are overlapping, and the first linkage section and the second linkage section are not overlapping.
In a preferred version, the kink near the first coupled section of described the first coupling line is provided with chamfering, and the kink near the second coupled section of described the second coupling line is provided with chamfering.
In a preferred version, described first signal input adapter, secondary signal input adapter, first signal out splice going splice, secondary signal out splice going splice include joint outside and joint is inner, described joint outside is positioned at corresponding wallboard outside, described joint inside is positioned at corresponding wallboard inner side, near the outside part being connected with described wallboard of described joint, is provided with isolation boss.
In a preferred version, the kink top of described the first coupling line and the second coupling line is electrically connected with the inner compression joint type of corresponding joint, and the width on described kink top is more bigger than the inner interior diameter of corresponding joint.
In a preferred version, described upper spacer medium is the upper spacer perpendicular to described the first wallboard, and described lower spacer medium is the lower clapboard perpendicular to described the first wallboard.
In a preferred version, middle spacer medium, lower spacer medium that described upper spacer medium is corresponding with it align.
In a preferred version, described base plate projection is at least arranged at least one place at following three places: be positioned at the first coupling line and the second coupling line overlapping ends kink, be positioned at the first coupled section and the first linkage section junction, be positioned at the not kink of overlapping ends of the first coupling line and the second coupling line.
In a preferred version, described upper spacer medium is located in cavity perpendicular to the first linkage section, from the first wallboard, stretches out, and the position through whole cavity and corresponding the first linkage section is not provided with a breach, and described breach is accommodated the first linkage section; Described lower spacer medium is located in cavity perpendicular to the second linkage section, from the second wallboard, stretches out, and the position through whole cavity and corresponding the second linkage section is not provided with a breach, and described breach is accommodated the second linkage section.
Below in conjunction with drawings and Examples, the utility model is described in further detail.
[accompanying drawing explanation]
Fig. 1 is the longitudinal sectional drawing of the 3dB electric bridge that provides of the utility model;
Fig. 2 is the vertical view after 3dB electric bridge that the utility model provides removes cover plate;
Fig. 3 is the vertical view of the 3dB electric bridge inside cavity part that provides of the utility model; And
Fig. 4 is the stereogram of the first signal input adapter of the electric bridge of 3dB shown in Fig. 1.
[embodiment]
Referring to figs. 1 to Fig. 3, the utility model provide a kind of 3dB electric bridge to comprise to form a cavity 101 base plate and some outsides wallboard, cover the cover plate 103 on cavity 101.Described cavity 101 bottoms are provided with groove; Described cover plate 103 underside shapes and cavity 101 bottoms are symmetrical set, and make the space of whole closed cavity be laterally zygomorphic state.Described cover plate 103 is fixed on cavity 101 outside wallboards by some screws.
With reference to figure 1 and Fig. 2, the utility model provides a kind of 3dB electric bridge also to comprise the first signal input adapter 210 that is installed on cavity 101 first outside wallboards, secondary signal input adapter 212 and the symmetrical first signal out splice going splice 220 that is installed on cavity 101 second outside wallboards, secondary signal out splice going splice 222, wherein first signal input adapter is corresponding in position with first signal out splice going splice, secondary signal input adapter is corresponding in position with secondary signal out splice going splice, and the first coupling line 310 and the second coupling line 320 that are arranged on cavity 101 inside, the first coupling line 310 two ends respectively with first signal input adapter 210, secondary signal out splice going splice 222 is electrically connected, the second coupling line 320 two ends respectively with secondary signal input adapter 212, secondary signal out splice going splice 220 is electrically connected, connected mode is compression joint type and connects, the end of the first coupling line 310 and the second coupling line 320 is mouthful more bigger than accommodating of the joint of its insertion, during installation, use special instrument to utilize the elasticity of metal by the receiving port of the end press-in connector of the first coupling line 310 and the second coupling line 320, and be screwed, can guarantee so seamless contact between joint and cavity, improve third order intermodulation index.
The first coupling line 310 and the second coupling line 320 layering settings, the first coupling line 310 is in upper (near cover plate 103), the second coupling line 320 under.Article two, coupling line shape is identical, and pars intermedia is fold-line-shaped, and two ends are respectively equipped with kink round about.The mid portion of the first coupling line 310 is divided into the first coupled section 313 and first linkage section 311 two parts, and the second coupling line 320 is divided into the second coupled section 323 and second linkage section 321 two parts by mid portion.When the first coupling line 310 and the second coupling line 320 layerings are placed, modes of emplacement is symmetrical placement (symmetrical centered by symmetric mode), fold-line-shaped opposite direction.The first coupled section 313 and the second coupled section 323 are overlapping, and the first linkage section 311 and the second linkage section 321 are not overlapping.Described the first coupling line 310 is provided with chamfering near the kink of the first coupled section 313, the second coupling line 320 is provided with chamfering near the kink of the second coupled section 323, increase chamfering and changed cavity and cover plate to the impedance matching between inner wire, reach the object of isolation, Insertion Loss and the standing wave index of improving electric bridge.
Described cavity 101 inside are provided with some dividing plate 401(perpendicular to the first coupled section 313 and the second coupled section 323 as spacer medium), in the present embodiment, there are two spaced-apart dividing plates 401 to be positioned among cavity perpendicular to the first coupled section 313 and perpendicular to cavity 101 base plates, and between the first coupled section 313 and cover plate 103, these two dividing plates are called upper spacer.Also have two spaced-apart dividing plates 401 to be positioned among cavity perpendicular to the first coupled section 313 and perpendicular to cavity 101 base plates, between the second coupled section 323 and cavity 101 base plates, these two dividing plates are called lower clapboard.Preferably, the upper spacer that lower clapboard is corresponding with it is longitudinally being positioned at same plane.Also have two spaced-apart dividing plates 401 to be positioned among cavity perpendicular to the first coupled section 313 and perpendicular to cavity 101 base plates, between the first coupled section 313 and the second coupled section 323, these two dividing plates are called median septum.Preferably, median septum aligns in the vertical with corresponding upper spacer and/or lower clapboard.For example, above-mentioned six dividing plates 401 wherein have three dividing plates (upper spacer and corresponding median septum, lower clapboard thereof) to be positioned at same plane, other three dividing plates (another piece upper spacer and corresponding median septum, lower clapboard) are positioned at same plane, and two planes are parallel to each other and perpendicular to cavity 101 base plates.The first coupling line and the parallel placement of the second coupling line have been guaranteed in the setting of upper spacer, median septum, lower clapboard, have guaranteed the degree of balance of the first coupling line and the second coupling line, effectively improve isolation of hybrid coupler and standing-wave ratio index.
This electric bridge also comprises dividing plate 405 and 407, wherein, dividing plate 405 is positioned in cavity perpendicular to the first linkage section 311 and perpendicular to cavity 101 base plates, and the wallboard that is positioned at the first linkage section 311 tops and extends to joint 222 sides, do not extend to the wallboard of joint 212 sides, so do not run through whole cavity.
Similarly, dividing plate 407 is positioned in cavity perpendicular to the first linkage section 321 and perpendicular to cavity 101 base plates, and the wallboard that is positioned at the first linkage section 321 belows and extends to joint 212 sides, does not extend to the wallboard of joint 222 sides, so do not run through whole cavity.
The position of corresponding the first coupling line of dividing plate 405 is provided with a downward breach, for accommodating the first coupling line; Same, the position of corresponding the second coupling line of dividing plate 407 is provided with a breach making progress, for accommodating the second coupling line.Dividing plate 405 is for separating the first coupling line and described cover plate, and dividing plate 407, for separating the second coupling line and described base plate, has been guaranteed the degree of balance of the first coupling line and the second coupling line, effectively improves isolation of hybrid coupler and power capacity index.
With reference to figure 1 and Fig. 2, the inner surface of described cavity 101 base plates is provided with some projections that make progress 105, and described protruding 105 are positioned at described the second coupling line 320 belows.In the present embodiment, at least one place that described in base plate, projection 105 has following three places: be positioned at the first coupling line 310 and the second coupling line 320 overlapping places of overlapping ends kink, be positioned at the first coupling line 310 and the second coupling line 320 disconnection overlappings centre, be positioned at the not centre of two kinks of overlapping one end of the first coupling line 310 and the second coupling line 320.The inner surface of described cover plate is provided with some downward protruding 105(towards the first coupling line), and described protruding 105 is corresponding on same straight line one by one with the projection of cavity 101 plate inner surfaces.
With reference to figure 2, Fig. 3 and Fig. 4, described first signal input adapter 210 comprises joint outside 241 and joint inside 243, and described joint outside 241 is positioned at described cavity 101 outsides, and described joint inside 243 is positioned at described cavity 101 inside.The outside part being connected with cavity 101 outside wallboards of described joint is provided with isolation boss 230, has improved electric bridge intermodulation index.Described joint inside is provided with accommodates mouth, for accommodating the end of the first coupling line 310 and the second coupling line 320.
For the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.