CN204834818U - Six port structures in broadband microwave - Google Patents

Abstract

The utility model discloses a six port structures in broadband microwave. The utility model provides a merit divides the utensil to have a three port, and the branch maybe signal input part and the first signal output and the 2nd signal output part, and the signal input part of a quadrature coupler in the first signal output and the quadrature coupler that is the three 3dB that the T type distributes is connected, the signal input part of another quadrature coupler in the 2nd signal output part and the quadrature coupler that is the three 3dB that the T type distributes is connected, another quadrature coupler in the three 3dB's that the T type distributes the quadrature coupler divides the ware position relative with the merit. The utility model discloses application scope is wide, through changing the technical indicator that ware and coupler are divided to the merit, can obtain different bandwidth and working frequency band to the different receiving system of adaptation.

Description

A kind of wide-band microwave six-port junction structure

Technical field

The utility model relates to electronics and communication field, is specifically related to a kind of wide-band microwave six-port junction structure be made up of a power splitter and three couplers.

Background technology

Along with the develop rapidly of wireless communication technology, the performance of radio frequency receiver is had higher requirement.Receiver rf front-end needs adaptive different communication standard, the signal of process different frequency bands, need to support different modulation system, cost is lower and be easy to upgrading and reconstruct, adopts software radio (SDR) technology then can meet above-mentioned requirement in receiver rf front-end.But the performance requirement of software radio to analog-digital converter (ADC) and digital signal processor (DSP) is higher, particularly particularly evident when signal frequency is higher.

Six―port technique is employed for microwave network analysis at first, a kind of six-port circuit that it is made up of the microwave device such as power splitter and directional coupler.It has two signal input ports and four signal output ports, contains amplitude and the phase information of input signal in four output ports, just can be obtained amplitude and the phase data of input signal by the amplitude and power information measuring output signal.Six―port technique is applied to SDR receiver, radiofrequency signal Directly solution can be transferred to baseband signal, thus greatly reduce the processing pressure of ADC and DSP.

Summary of the invention

The purpose of this utility model is to provide a kind of bandwidth, and volume is little, the six-port microwave network configuration that stability is high.

The concrete technical scheme that the utility model is taked:

The utility model three-decker, comprises the power splitter of a 3dB and the orthocoupler of three 3dB, and wherein bottom comprises power splitter and lower ground plane, and middle level comprises orthocoupler, and top layer comprises ground plane;

Described power splitter has three ports, and be signal input part and the first signal output part and secondary signal output respectively, the first signal output part is connected with the signal input part of an orthocoupler in the orthocoupler of three 3dB of T-shaped distribution; Secondary signal output is connected with the signal input part of another orthocoupler in the orthocoupler of three 3dB of T-shaped distribution; Another orthocoupler in the orthocoupler of three 3dB of T-shaped distribution is relative with power splitter position.

Furtherly, described power splitter is the Wilkinson power splitter of seven grades; Reach by seven joint impedance transformer cascades the effect increasing bandwidth, every grade of impedance transformer design becomes a few font to save the space of whole power splitter.

Furtherly, the orthocoupler of described 3dB all has identical structure, each orthocoupler is the 3dB orthocoupler of intersection tandem type, specifically the mode of the weak coupling coupler of two 8.34dB by series connection is combined, forms the strong coupling device of 3dB; Each 8.34dB coupler has the impedance transformer of 9 grades, increases bandwidth by increasing progression.

Compared with prior art, the utility model beneficial effect is:

(1) compact, is convenient to integrated, and after power splitter and coupler pressing, volume only has 82.94mm × 99.16mm × 1.9mm.

(2) working band is wide, can work in the frequency band range of 5-9Ghz.

(3) applied widely, by changing the technical indicator of power splitter and coupler, different bandwidth sum working frequency range can be obtained, thus adapt to different receiving systems.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the utility model wide-band microwave six-port junction structure.

Embodiment

Be illustrated in figure 1 six-port network structural representation, its middle port 2 correspondence be Wilkinson power splitter, port 3 and 4, port 5 and 6, port 7 and 1 be corresponding three 3dB orthocouplers intersecting tandem types respectively.

This power splitter is the power splitter of one-to-two, has three ports, an input two outputs.The theoretical loss of two outputs is 3dB, outputs to the input port 8,10 of two couplers respectively.The position coupler of its middle port 8 and power splitter coplanar, so be directly connected.The position power splitter of port one 0 and coupler midfeather substrate, so be connected by a via hole.In seven joint power splitters, each joint all comprises an isolation resistance, ensures that power splitter input and output keep higher isolation.Described power splitter is the Wilkinson power splitter of 7 grades.Reached the effect increasing bandwidth by more piece λ/4 impedance transformer cascade, every grade of impedance transformer design becomes a few font to save the space of whole power splitter.Have employed the F4B medium substrate that dielectric constant is 2.65, substrate thickness is 0.8mm.

Three couplers all have identical structure, are the 3dB orthocoupler of intersection tandem type.For the coupler of port 3 and port 4 correspondence, it is biased strip line coupler by the weak coupling of two 8.34dB and is in series, and forms the close coupling of 3dB.Coupler comprises 4 ports, the corresponding input port of its middle port 8, and port 3 is straight-through ends, and port 4 is coupled end, and 9 correspond to isolated port.Coupler always has 9 joints, adopts the mode of biased coupling, the tow sides of laminar substrate so the conduction band of levels is clipped in the middle by needs three layers of medium substrate.Three layers of medium substrate of coupler, thickness is respectively 0.8mm, 0.3mm and 0.8mm.The wherein one side of upper and lower two-layer substrate is ground plane, and middle laminar substrate is one piece of double sided board, and all there is the conduction band of coupler top and bottom and mutually intersects to form biased coupling.

This six-port junction structure comprises 7 ports, and its middle port 7 needs the matched load connecing 50 ohm.Port one is signal input part, and port 2 is local oscillator input, and port 3 is 4 outputs to port 6.Theoretical bandwidth of operation can reach 2-12GHz, and in working band, return loss S11, S22 are better than-15dB, and isolation S12 is better than-20dB, and the amplitude imbalance degree of four output ports is better than ± 2dB, and phase unbalance degree is better than ± and 10 °.The utility model achieves wide-band microwave six-port network, can be met the requirement of radio-frequency front-end by test.

Claims (1)

1. a wide-band microwave six-port junction structure, this structure is three-decker, comprises the power splitter of a 3dB and the orthocoupler of three 3dB, it is characterized in that: wherein bottom comprises power splitter and lower ground plane, middle level comprises orthocoupler, and top layer comprises ground plane;

Described power splitter has three ports, and be signal input part and the first signal output part and secondary signal output respectively, the first signal output part is connected with the signal input part of an orthocoupler in the orthocoupler of three 3dB of T-shaped distribution; Secondary signal output is connected with the signal input part of another orthocoupler in the orthocoupler of three 3dB of T-shaped distribution; Another orthocoupler in the orthocoupler of three 3dB of T-shaped distribution is relative with power splitter position.