A kind of circular polarisation phased array antenna unitTechnical field
The present invention relates to phased array antenna, especially a kind of circular polarisation phased array antenna unit using metal waveguide.
Background technique
Phased array antenna be by control array in each array element phase realize antenna beam be directed toward in space scanning orRotation, is the important component of modern phased array radar system.Carry-on communication system requirements antenna element has low section,To meet equipment installation requirements；Array element spacing is small, realizes wave beam large-angle scanning；Power capacity is big, can bear larger transmission power.
Circular polarized antenna can receive any polarized electromagnetic wave, and its radiated wave can also be connect by any polarized antennaIt receives.Circular polarisation phased array antenna is applied in the communication system of aircraft, and beam position can be promptly with the appearance of aircraftThe variation of state and position and change.
Circular polarisation phased array antenna unit form can be divided into waveguide, micro-strip and Corkscrews antenna, and multi-purpose coaxial line is presentedElectricity.When waveguide class antenna uses coaxial feeding, coaxial inner conductor probes into certain depth in waveguide cavity, does not connect with wave guide wallIt connects.Thus the problem of bringing is that, in processing, the precision that coaxial inner conductor probes into seriously affects the standing wave of radiating guidePerformance even results in antenna and is not available.
Summary of the invention
The present invention proposes a kind of circular polarisation aiming at the problem that existing radiating guide feeder line, which probes into precision, influences antenna performancePhased array antenna unit, the processing is simple, guarantees the qualification rate and precision of product.
The present invention is made of metal waveguide, polyimide media material, mating structure, connector, circular polarizer；
The metal waveguide is metal material, and shape is inverted L shape, and the top of L-type is square；Side is rectangle；
The polyimide media material is filled up into metal waveguide, and polyimide media block protrudes metal waveguide；
The connector is the feed structure of waveguide, and connector is fixed in the space under metal waveguide, and connector has twoRoad probe, connect for signal input part with signal source all the way, is all the way the connection of the side of output end and metal waveguide；
The side of the metal waveguide be feed waveguide chamber, inside have mating structure, be stepped pyramid structure, withThe output end probe of connector connects.
The circular polarisation is stepped diaphragm structure, the middle position at the top of metal waveguide.
Further, it is characterised in that the connector cannot protrude the boundary of metal waveguide.
Further, it is characterised in that the connector is the feed structure of waveguide, is cuboid.
Compared to conventional radiating guide have the advantages that following characteristics and:
1, working band is wide.Use frequency bandwidth of the circular polarisation phased array antenna unit standing wave of metal waveguide less than 2 for2.1GHz。
2, section is low.The section height of waveguide circular polarisation phased array antenna unit is 15mm.
3, wide angle matching performance is good.Polyimide media block loads in waveguide cavity, reduces the bore of antenna element, dayThe size of line is only 9mm × 9mm, and ± 45 ° of scanning of composition array aft antenna, when, gain is dropped by less than 3dB, and antenna has goodLarge-angle scanning performance.
4, the processing is simple.Present invention employs feed mating structures, and the probe of feeder line and wave guide wall are directly weldedIt connects, when eliminating processing, the precision bring that feeder line probes into depth influences.
Detailed description of the invention
Fig. 1 is antenna element bottom view.
Fig. 2 is the just equal side views of antenna element.
Fig. 3 is waveguide internal structure top view.
Fig. 4 is the perspective view of metal waveguide in the present invention
Fig. 5 is the perspective view of polyimide media material in the present invention
Fig. 6 is the perspective view of connector in the present invention
Specific embodiment
Following further describes the present invention with reference to the drawings.Without limitation.
The present invention is mainly by metal waveguide 3, polyimide media material 2, mating structure 4, connector 1,5 groups of circular polarizerAt.Referring to Fig.1.
Metal waveguide 3 is metal material, such as copper, aluminium light-weight metal.Its shape is inverted L shape, and the top 31 of L-type is sideType is radiant section；Side 32 is rectangle, is feed section.
Polyimide media material 2 is filled up into metal waveguide 3, and polyimide media block 2 protrudes metal waveguide 3.UsingPolyimide media material 2 reduces antenna aperture, and protrusion part improves antenna axial ratio.As shown in Figure 5.
Connector 1 is the feed structure of waveguide, is fed to antenna.It can also be other shapes for cuboid.Connector 1 is solidIt is connected in the space under metal waveguide 3, connector 1 cannot protrude the boundary of metal waveguide 3.Connector 1 has two-way probe, all the wayIt connect for signal input part with signal source, is connect all the way for output end with the side 32 of metal waveguide 3.
Referring to Fig. 2, the side 32 of metal waveguide 3 is feed waveguide chamber, inside have mating structure 4, be stepped golden wordTower structure is connect with the output end probe of connector 1.
Circular polarisation 5 is stepped diaphragm structure, to generate circularly polarised wave.Interposition positioned at 3 top 31 of metal waveguideIt sets.Referring to fig. 4.
Its antenna element size of the present embodiment is 9mm × 9mm, and waveguide caliber size is 6.8mm × 6.8mm, feed waveguideSize be 9mm × 4.3mm × 7.8mm.Polyimide media block protrudes waveguide 1mm, to improve the axial ratio bandwidth of antenna.SSMPConnector installation site is 4.6mm away from waveguide bottom distance.
For mating structure 4 by 3 with a thickness of 0.5mm, height is respectively 6.5mm, and the metal block of 8.2mm, 8.7mm are constituted.RankLadder type circular polarizer with a thickness of 1mm, be made of 4 grades of steps, the height of 4 grades of steps is respectively 0.5mm, 1.2mm, 2mm,2.7mm。