CN204333200U - The spatial power combiner of a kind of waveguide-bis-Coupler in finline-microstrip line form - Google Patents

Abstract

The utility model relates to the spatial power combiner of a kind of waveguide-bis-Coupler in finline-microstrip line form, comprises and connects waveguide port, transition structure, anti-resonance piece and microstrip line; Transition structure adopts the metal gradient fin line of cosine square equation, be printed on the tow sides of medium substrate, the metal gradient fin-line transition in front becomes two-way microstrip line, the metal gradient fin line of reverse side is as ground, anti-resonance piece is printed on the reverse side of medium substrate, and employing two ends are semicircle, centre is rectangular shape.

Description

The spatial power combiner of a kind of waveguide-bis-Coupler in finline-microstrip line form

Technical field

The present invention relates to Radar Technology field, the spatial power combiner specifically in radar solid state transmitter.

Background technology

High power amplifier is one of microwave or the requisite critical component of millimeter wave frequency band transmitter, and it realizes power amplification function mainly through electron tube or solid state device.For electron tube, because it is high tension apparatus, need in actual applications to provide high voltage power supply, so volume and weight has certain restriction to application scenario; For solid-state amplifier part, there is the advantages such as voltage is low, volume is little, lightweight, particularly along with micro-band printed circuit is applied in radar solid state transmitter, solid-state amplifier part can be applied in occasion widely, but single solid-state power amplifier part, its power capacity is lower than electron tube, usually can not meet powerful requirement.In order to not only the advantage of solid-state amplifier part can be embodied but also can meet powerful actual demand, just need design passive power synthesis network the output of multiple Power Solid State amplifier to be superposed, namely carry out space power synthesis.

Summary of the invention

The technical problem solved

In order to the power capacity solved due to single solid-state amplifier part is little, and solid state transmitter needs power combing problem when exporting high-power.The present invention proposes the spatial power combiner of a kind of waveguide-bis-Coupler in finline-microstrip line form.

Technical scheme

A spatial power combiner for waveguide-bis-Coupler in finline-microstrip line form, comprises and connects waveguide port, transition structure, anti-resonance piece and microstrip line; It is characterized in that transition structure adopts the metal gradient fin line of cosine square equation, be printed on the tow sides of medium substrate, the metal gradient fin-line transition in front becomes two-way microstrip line, the metal gradient fin line of reverse side is as ground, anti-resonance piece is printed on the reverse side of medium substrate, and employing two ends are semicircle, centre is rectangular shape; Extend 1/4 medium wavelength in medium substrate both sides and have the dielectric substrate on metal ground as mount fixing structure, mount fixing structure is opened equidistant circular hole.

Described metal gradient fin line cosine square equation:

$\mathrm{\ω}\left(z\right)=\frac{b/2+\mathrm{\ω}}{2}{\sin }^2\left(\frac{\mathrm{\πz}}{{2L}_f}\right),0\≤z\≤L_f$

In formula, ω is the width of 50 Ω microstrip lines, and z is the along slope coordinate of fin line transmission line, and b is duct height, L _ffor transition section length, value 1.5 λ g, wherein λ g is TE10 mould guide wavelength.

Medium substrate selects RT/Duroid 5880 material, DIELECTRIC CONSTANT ε _r=2.2, dielectric thickness is 0.254mm.

Beneficial effect

The spatial power combiner of a kind of waveguide-bis-Coupler in finline-microstrip line form that the present invention proposes, in Ku frequency range 12.5GHz ~ 15.5GHz, the insertion loss of power combiner is less than 0.6dB, and return loss is greater than 16dB.The advantage of this power combiner is mainly: when achieving space power synthesis in 3GHz bandwidth, by the quantization of amplitude in a road waveguide along separate routes be coupled on 4 microstrip lines, be convenient to solid state power amplifier device on micro-band printed circuit amplify input power simultaneously, and exported by a road sign Quasi-Waveguide mouth.Structurally be easy to machining, be convenient to install.In electric property, achieve less insertion loss and larger return loss.

Accompanying drawing explanation

Coupler in finline structure key diagram in Fig. 1 the present invention

1-connects waveguide port; 2-transition structure; The anti-resonance piece of 3-; 4-short-circuit piece; 5-microstrip line; 6-dielectric substrate fixed structure

Coupler in finline frontage dimension sign picture in Fig. 2 the present invention

Coupler in finline reverse side size indication figure in Fig. 3 the present invention

Two Coupler in finline structure key diagram in Fig. 4 the present invention

7-waveguide, 8-is transition structure back-to-back

Two Coupler in finline size indication figure in Fig. 5 the present invention

Two Coupler in finline back to back structure voltage standing-wave ratio simulation result figure in Fig. 6 the present invention

Two Coupler in finline back to back structure insertion loss simulation result figure in Fig. 7 the present invention

Embodiment

Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:

In radar transmitter, adopt the passive power combining networks object of waveguide-bis-Coupler in finline-microstrip line transition structure to be to realize the power combing in waveguide, ensure good power combining efficiency and bandwidth of operation, and less radiation loss, and be applicable to the installation of solid state device in micro-band printed circuit.In the present invention, adopt regular rectangular shape standard waveguide as the constrained input port of power.Physically, the broadside of waveguide can be carried out multilayer subdivision, form identical multilayer planar structure, each layer realizes power amplification circuit structure.Meanwhile, standard waveguide is convenient to carry out standardization with front and back circuit and is connected.Transmit the condition of work of main mould in waveguide under, the synthesis that power carries out in the waveguide of equivalence.Transition structure adopts waveguide to turn the form of micro-band, by the Energy Coupling that transmits in waveguide in micro-band printed circuit of every one deck, the power of each branch road amplifies by recycling solid-state amplifier part, output takes micro-transition structure taking waveguide to by the coupling power after amplifying in waveguide, and the synthesis achieving power exports.

In the present invention, the interim form of two Coupler in finline is adopted to realize the Energy Transfer of waveguide-micro-interband.Two Coupler in finline can be considered directrix plane structure, not only be easy in the every layer plane structure after being integrated in waveguide broadside multilayer subdivision, and owing to have employed two-channel structure, can in same plane, the power in waveguide is divided into the two-way energy of Phase amplitude-matched and be coupled on microstrip line.Power combing on microstrip line is coupled in waveguide by same interim form at output.

Select Ku frequency range standard rectangular waveguide BJ140 (15.8mm × 7.9mm), microstrip line dielectric substrate selects RT/Duroid 5880 material, its dielectric constant=2.2, and dielectric thickness is 0.254mm.

As Fig. 1, by connecting a bit of dielectric substrate of waveguide port to reduce the discontinuous effect of waveguide transition to micro-band dielectric substrate.Then, be transitioned into gradual change fin line section, gradual change fin line adopts edge gradually nyctitropic smooth impedance transition curve, and curvilinear equation is cosine square equation.In gradual change fin line section, two metal fins are printed on the two sides of medium substrate, and a fin as microstrip line, and is smoothly divided into identical two-way, and another fin, as the ground of microstrip line, is connected with waveguide metal wall with short-circuit piece.Anti-resonance metal sheet is printed on the one side on microstrip line ground, with microstrip line at a distance of a bit of distance.Can be placed in waveguide to make whole power combining structures, extend one section in dielectric substrate both sides and have the dielectric substrate on metal ground as mount fixing structure, extension width is about 1/4 medium wavelength, and fixed structure is opened equidistant circular hole, to prevent resonance.

As Fig. 2, gradual change fin line cosine square transition equation is

$\mathrm{\ω}\left(z\right)=\frac{b/2+\mathrm{\ω}}{2}{\sin }^2\left(\frac{\mathrm{\πz}}{{2L}_f}\right),0\≤z\≤L_f$

In formula, ω is the width of 50 Ω microstrip lines, and z is the along slope coordinate of fin line transmission line, and b is duct height, L _ffor transition section length.L _flength too short, the reflection coefficient of port can be made to increase; Length is long, and the loss of meeting increasing circuit, so generally get 1.5 λ about g (λ g is TE10 mould guide wavelength).

The semi arch radius at the anti-resonance piece two ends at the Coupler in finline back side is L _r, intermediate distance is L _c, be S apart from the semi arch distance of fin line transition line composition, short-circuit piece distance is L _s, micro belt line width is W _m, at a distance of W _ms, fixed structure width is W _x, opening diameter is R.

As Fig. 3, be arranged in the broadside of standard waveguide by above-mentioned two identical Coupler in finline transition structures with back-to-back form, short-circuit piece, between two dielectric substrates, is connected with the long limit of wave guide wall.As Fig. 4, the spacing of two Coupler in finline is Ds.

Utilize Ansoft HFSS electromagnetic simulation software, adopt above-mentioned pair of Coupler in finline structure back-to-back form simulation optimization is carried out to parameters, parameter optimization result is as shown in table 1.

As Fig. 5, simulation result shows: in 12.5GHz ~ 15.5GHz working band, and two Coupler in finline voltage standing wave ratio is all less than 1.35, reaches maximum 1.34 at 14.35GHz.As Fig. 6, in 12.5GHz ~ 15.5GHz working band, two Coupler in finline insertion loss is all less than 0.6dB, and monolateral loss is less than 0.3dB, reaches maximum 0.55dB at 15.5GHz.

Table 1 pair Coupler in finline dimensional parameters

Wd	Ws	D	L	Lf	Lm
						3.94mm	6.03mm	6.1mm	39mm	19.9mm	17.5mm
Wm	Wms	W	Wx	Ls	Lr
						0.76mm	3.18mm	7.9mm	4.05mm	34.5mm	1.3mm

Lc	S	R	Ds
						9.5mm	0.3mm	2.4mm	6.5mm

Claims (3)

1. the spatial power combiner of waveguide-bis-Coupler in finline-microstrip line form, comprise and connect waveguide port, transition structure, anti-resonance piece and microstrip line, it is characterized in that transition structure adopts the metal gradient fin line of cosine square equation, be printed on the tow sides of medium substrate, the metal gradient fin-line transition in front becomes two-way microstrip line, the metal gradient fin line of reverse side is as ground, and anti-resonance piece is printed on the reverse side of medium substrate, and employing two ends are semicircle, centre is rectangular shape; Extend 1/4 medium wavelength in medium substrate both sides and have the dielectric substrate on metal ground as mount fixing structure, mount fixing structure is opened equidistant circular hole.

2. the spatial power combiner of waveguide according to claim 1-bis-Coupler in finline-microstrip line form, is characterized in that described metal gradient fin line cosine square equation:

$\mathrm{\ω}\left(z\right)=\frac{b/2+\mathrm{\ω}}{2}{\sin }^2\left(\frac{\mathrm{\πz}}{2L_f}\right),0\≤z\≤L_f$

In formula, ω is the width of 50 Ω microstrip lines, and z is the along slope coordinate of fin line transmission line, and b is duct height, L _ffor transition section length, value 1.5 λ g, wherein λ g is TE10 mould guide wavelength.

3. the spatial power combiner of waveguide according to claim 1-bis-Coupler in finline-microstrip line form, is characterized in that medium substrate selects RT/Duroid 5880 material, DIELECTRIC CONSTANT ε _r=2.2, dielectric thickness is 0.254mm.