CN203747044U - Microwave ferrite all-polarizer - Google Patents

Abstract

The utility model discloses a microwave ferrite all-polarizer which is formed by cascade connection of a variable polarizer and a dual-mode differential phase shifter. By the microwave ferrite all-polarizer, polarization of horizontal or vertical input can be converted into elliptic polarization (including horizontal, vertical and positive and negative circular polarization) output of any direction of turning, any inclination and any axial ratio.

Description

A kind of microwave ferrite full-polarizer

Technical field

The utility model relates to radar communication field, specifically a kind of microwave ferrite full-polarizer.

Background technology

Microwave Iron Oxide Elements obtain a wide range of applications at electronic technology fields such as microwave communication, radar, microwave energies.Along with Radar Technology development such as phase arrays, Ferrite Variable Polarization technology also applies in radar system more and more in recent years.

At present, in radar system target observation, applying maximum, modal microwave ferrite polarization device is mainly single polarization device, the identification of radar system target can only be confined to " point " and not cover " body ", simultaneously, single Changeable Polarization Radar System antijamming capability is not strong yet, causes being subject in actual combat the restriction of the factors such as weather, extreme terrain, electronic jamming.Along with improving constantly of following ECM (Electronic Countermeasures), the antijamming capability of radar is also proposed to requirements at the higher level.For this reason, how to develop new polarizer kind, improve antijamming capability and the target recognition capability of radar system, seem particularly important.

Utility model content

In order to solve problems of the prior art, the utility model provides a kind of can improve the antijamming capability of radar system and the microwave ferrite full-polarizer of target recognition capability.

Technical scheme: a kind of microwave ferrite full-polarizer, it is formed by polarization section and the cascade of differential phase shift section, and the length of described polarization section is 2 times and polarization section and the public ferrite bar of differential phase shift section of the length of differential phase shift section; Described polarization section and differential phase shift section are four field structures, and four magnetic poles of polarization section are staggered successively 90 ° and are arranged symmetrically with along ferrite bar axis direction; Four magnetic poles of differential phase shift section are staggered successively 90 ° and are arranged symmetrically with and are 45 ° of skews with four magnetic poles of polarization section respectively along ferrite bar axis direction.

More excellent, eight magnetic poles of described full-polarizer respectively have a coil, each coil NA=2.

More excellent, described ferrite bar radius R=5mm, ferrite bar overall length L=60mm.

More excellent, there is copper coin waveguide at two end devices of described ferrite bar.

More excellent, be provided with the pottery mating with described copper coin waveguide at the two ends of described ferrite bar.

Beneficial effect: microwave ferrite full-polarizer of the present utility model is divided into polarization section and differential phase shift section, and the length of polarization section is 2 times of differential phase shift segment length, tend to realize polarization and differential phase shift function by applying different magnetization, the polarization conversion of level (or vertical) input can be become to elliptical polarization (comprising level, vertical, the positive and negative circular polarization) output of any rotation direction, arbitrary angle, arbitrary axis ratio.

Brief description of the drawings

Fig. 1 is a kind of microwave ferrite full-polarizer of the utility model positive view.

Fig. 2 is A-A line sectional view in Fig. 1, but ferrite bar departs from from polarization section.

Fig. 3 is B-B line sectional view in Fig. 1, but ferrite bar departs from from differential phase shift section.

Fig. 4 is C-C line sectional view in Fig. 1.

Fig. 5 is magnetic flux distribution schematic diagram in polarization section V cross section.

Fig. 6 is magnetic flux distribution schematic diagram in bimodulus differential phase shift section Φ cross section.

Fig. 7 a-7j is the various typical polarization emulation schematic diagram of a kind of microwave ferrite full-polarizer of the utility model.

Embodiment

Below in conjunction with embodiment, the utility model is described in further detail with reference to the accompanying drawings.

As Figure 1-4, a kind of microwave ferrite full-polarizer, it is by polarization section 1(V) and bimodulus differential phase shift device 2(Φ) cascade forms, wherein: four magnetic poles of polarization section 1 are arranged symmetrically with along ferrite bar 3 axis directions, four magnetic poles of differential phase shift section 2 are arranged symmetrically with and are 45 ° of skews with four magnetic poles that change section respectively along ferrite bar 3 axis directions.Two end devices at ferrite bar 3 have copper coin waveguide 4, are provided with the cylinder pottery 5 mating with copper coin waveguide 4 at the two ends of described ferrite bar 3.We define polarization matrix T, can describe easily polarization process.

$T=\left(\begin{array}{cc}{T}_{11}& T_{12}\\ T_{21}& T_{22}\end{array}\right)---\left(1\right)$

T ₁₁represent that mould 1 is from holding 1 input, mould 1 is from holding 2 outputs; T ₁₂represent that mould 1 is from holding 1 input, mould 2 is from holding 2 outputs; T ₂₁represent that mould 2 is from holding 1 input, mould 1 is from holding 2 outputs; T ₂₂represent that mould 2 is from holding 1 input, mould 2 is from holding 2 outputs.

$T=T_{\mathrm{\φ}}\·T_{\mathrm{\α}}=\left(\begin{array}{cc}{e}^{\mathrm{j\Δ\φ}}& 0\\ 0& 1\end{array}\right)\left(\begin{array}{cc}\cos \mathrm{\α}& j\sin \mathrm{\α}\\ j\sin \mathrm{\α}& \cos \mathrm{\α}\end{array}\right)=\left(\begin{array}{cc}{\cos \mathrm{\α}\·e}^{\mathrm{j\Δ\φ}}& j\sin \mathrm{\α}\·e^{\mathrm{j\Δ\φ}}\\ j\sin \mathrm{\α}& \cos \mathrm{\α}\end{array}\right)---\left(2\right)$

If input horizontal polarization input a=(1 0) ^Τ, being polarized to of output:

$b=T\·a=\left(\begin{array}{c}\cos \mathrm{\α}\·e^{\mathrm{j\φ}}\\ \sin \mathrm{\α}\end{array}\right)---\left(3\right)$

In formula:

Formula (3) is typical Jones polarization matrix, when α [90 °, 90 °], while variation in territory, can obtain complete polarization output.

Polarization section 1 and bimodulus differential phase shift section 2 structures are basically identical, and for obtaining α=± 90 °, the length of polarization section 1 is 2 times of differential phase shift section 2

Fig. 5 and Fig. 6 are respectively flux density B distribution situation in magnetic pole cross section of polarization section 1 and differential phase shift section 2, near B ≈ 300～700Gs ferrite bar 3 centers; Near B ≈ 1200～1500Gs ferrite bar 3 faces of cylinder.Polarization section 1 distribution of magnetization is symmetrical in horizontal/vertical, and the distribution of magnetization of bimodulus differential phase shift section 2 is symmetrical in ± 45 ° of axles, different magnetization trends embody different functions: polarization and differential phase shift.

Two four field structures totally 8 coils, each coil NA=2, ferrite bar 3R=5mm, ferrite bar 3 overall length L=60mm, external magnetic circuit and magnetic pole head are all to form with same Ferrite Material.The distribution pattern of magnetizing field H is identical with B's, just varies in size, and magnetic field numerical value 2 oersteds (Oe).

Different polarized states can be used various combination is realized: in Fig. 1, if input from left port (polarization section 1 input) with horizontal polarization (vertical direction), along ferrite bar 3 axis directions transmission, observe its polarization change at the center of right output port (bimodulus differential phase shift section 2 outputs), as following table:

Horizontal polarization HP, perpendicular polarization VP, right/left circular polarization RCP/LCP, right/left elliptical polarization REP/LEP list

The various typical polarization state that upper tabular goes out is as shown in Fig. 7 a-7j, the change of various typical case's polarization of upper table is to be realized by electrical control circuit control size of current, electrical control circuit is taked the setting of routine techniques scheme, can control in theory current value size and realize any polarization,, microwave ferrite full-polarizer is a kind of microwave ferrite device that can change arbitrarily polarization output.

Claims (5)

1. a microwave ferrite full-polarizer, it is characterized in that it is formed by polarization section (1) and differential phase shift section (2) cascade, the length of described polarization section (1) is 2 times of length of differential phase shift section (2), and polarization section (1) and differential phase shift section (2) share a ferrite bar (3); Described polarization section (1) and differential phase shift section (2) are four field structures, and four magnetic poles of polarization section (1) are arranged along ferrite bar (3) axis vertical direction, and the line of relative two magnetic poles is mutually orthogonal; Four magnetic poles of differential phase shift section (2) are along ferrite bar (3) axis vertical direction layout, and the line of relative two magnetic poles is mutually orthogonal, and is 45 ° of skews with four magnetic poles of polarization section (1) respectively.

2. a kind of microwave ferrite full-polarizer according to claim 1, is characterized in that eight magnetic poles of described full-polarizer respectively have a coil, each coil NA=2.

3. a kind of microwave ferrite full-polarizer according to claim 1, is characterized in that described ferrite bar (3) radius R=5mm, ferrite bar (3) overall length L=60mm.

4. a kind of microwave ferrite full-polarizer according to claim 1, is characterized in that there is copper coin waveguide (4) at two end devices of described ferrite bar (3).

5. a kind of microwave ferrite full-polarizer according to claim 4, is characterized in that being provided with at the two ends of described ferrite bar (3) pottery (5) mating with described copper coin waveguide (4).