CN201503918U

CN201503918U - Horn antenna with constant wave-beam

Info

Publication number: CN201503918U
Application number: CN2009202360237U
Authority: CN
Inventors: 任加进; 滕晓华
Original assignee: CETC 14 Research Institute
Current assignee: CETC 14 Research Institute
Priority date: 2009-09-25
Filing date: 2009-09-25
Publication date: 2010-06-09
Anticipated expiration: 2019-09-25

Abstract

The utility model relates to a horn antenna with constant wave-beam, comprising a horn radiator, a horn activation section, wherein, the horn radiator is connected with the horn activation section; the horn radiator comprises a horn fan-shaped surface, and the horn fan-shaped surface introduces a cylindrical bore surface to the horn radiator, and the flare angle of the fan-shaped surface is about equal to two times of the wave-beam width, the radius of the fan-shaped surface is larger than the ratio of the half wavelength and the radius of the fan-shaped surface, and the E horn surface is provided with the flare angle of 1degree-2degrees; the horn activation section comprises a transition ridge, a coaxial-line outer conductor, a coaxial-line inner conductor, a rectangular waveguide, and a rear cavity, wherein, one end of the transition ridge is connected with the coaxial-line, which leads the main module impedance to be about 50omega, and the coaxial-line outer conductor is connected with the broadside of the transition ridge, the coaxial-line inner conductor is connected with the two opposite transition ridges for facilitating the matching, and the coaxial-line inner conductor is arranged close to the end of the transition ridge; the other end of the transition ridge is connected with the rectangular waveguide, the size of the cross section of the transition ridge gradually becomes larger, and the waveguide between the activation end and the short circuit surface forms an empty cavity.

Description

A kind of horn antenna of constant wave beam

Technical field

The utility model relates to a kind of horn antenna of constant wave beam, belongs to microwave technical field.

Background technology

Horn antenna is a kind of antenna form commonly used, in radar, radio frequency simulation, electronic countermeasures and the communication of various systems application is arranged all.The purposes of horn antenna has two aspects, and the one, use as stand-alone antenna, be called horn antenna; The 2nd, with multi-form reflecting surface or the lens of its irradiation, be called Feed Horn or feed.

In general, the beamwidth of common horn antenna narrows down with the increase of frequency, and beamwidth and frequency are approximated to inversely prroportional relationship.Along with the development of technology is used in combination the difference of environment, horn antenna is required more and more higher, bandwidth is more and more wideer, and in bandwidth of operation, requires the beamwidth of antenna, gain, minor levels etc. change little.For example, adopt broadband direction-finding receiver just to require a plurality of reception horn antennas that constant beamwidth beamwidth is arranged than width of cloth method.Realize at present the method for constant wave beam horn antenna, adopt the large angle corrugated horn mostly, its can accomplish in the bandwidth at 1: 2.5 beamwidth change relatively be no more than ± 20%, be not suitable for the higher direction-finding system of required precision.

The utility model content

1, technical problem to be solved:

Provide a kind of at above not enough the utility model, guaranteed other performance index of antenna simultaneously, reduced the horn antenna of a kind of constant wave beam of manufacturing cost in 8GHz～18GHz horn antenna constant relatively realizability of beamwidth in its bandwidth of operation.

2, technical scheme:

The utility model comprises horn radiator, loudspeaker activation fragment, and horn radiator links to each other with the loudspeaker activation fragment; Horn radiator is made up of the loudspeaker sector, the loudspeaker sector is that horn radiator has been introduced cylindrical bore face, the sector subtended angle approximates the beamwidth of twice, and the sector radius is much larger than the ratio of half-wavelength and sector subtended angle, at have an appointment 1 °～2 ° subtended angle of loudspeaker E face; The loudspeaker activation fragment comprises transition ridge, coaxial outer conductor, coaxial inner conductor, rectangular waveguide, back cavity, transition ridge one end connects coaxial line, making its main mould impedance is about 50 Ω, coaxial outer conductor is connected on the broadside of transition ridge, coaxial inner conductor is connected on two relative transition ridges, and coaxial inner conductor designs in the place near transition ridge end; The transition ridge other end connects rectangular waveguide, and transition ridge cross sectional dimensions becomes greatly gradually, and the waveguide between excitation end and the short circuit face forms cavity.The transition ridge adopts the double ridged waveguide of index gradual change form.

3, beneficial effect:

Horn antenna of the present utility model beamwidth of (1: 2.5 bandwidth) in the bandwidth of operation of broad is constant, changes in ± 5% relatively, and simple in structure, easy to process.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a horn radiator structural representation of the present utility model;

Fig. 3 is loudspeaker activation fragment of the present utility model (broadband coaxial-waveguide transformer) structural representation.

Embodiment

Below in conjunction with the drawings and the specific embodiments the utility model is described further.

As shown in Figure 1, the utility model comprises horn radiator 1, loudspeaker activation fragment 2 (broadband coaxial-waveguide transformer).Horn radiator 1 links to each other with loudspeaker activation fragment 2.

As shown in Figure 2,21 is that loudspeaker sector, 22 is that sector subtended angle, 23 is that sector radius, 24 is loudspeaker E face subtended angle; Horn radiator is made up of loudspeaker sector 21, and loudspeaker sector 21 has been introduced cylindrical bore face 25 for horn radiator, can make the radiated wave of different wave length that same radiated wave is arranged before, reach the constant purpose of beamwidth.Sector subtended angle 22 approximates the beamwidth of twice, and sector radius 23 is much larger than the ratio of half-wavelength and sector subtended angle, at have an appointment 1 °～2 ° subtended angle of loudspeaker E face 24.

As shown in Figure 3,31 is that transition ridge, 32 is that coaxial outer conductor, 33 is that coaxial inner conductor, 34 is that rectangular waveguide, 35 is back cavity.Loudspeaker activation fragment 2 comprises transition ridge 31, coaxial outer conductor 32, coaxial inner conductor 33, rectangular waveguide 34, back cavity 35; Transition ridge 31 adopts the double ridged waveguide of index gradual change form, transition ridge 31 1 ends connect coaxial line, making its main mould impedance is about 50 Ω, coaxial outer conductor 32 is connected on the broadside of transition ridge 31, coaxial inner conductor 33 (probe) is connected on two relative transition ridges 31 in order to coupling, coaxial inner conductor 33 is near more apart from transition ridge 31 ends, and the standing-wave ratio performance of antenna is good more, therefore coaxial inner conductor 33 is designed in the place near transition ridge 31 ends; Transition ridge 31 other ends connect rectangular waveguide 34, in order to improve the coupling of activation fragment to the loudspeaker radiation section, allow transition ridge 31 cross sectional dimensions become gradually greatly, and the waveguide between excitation end and the short circuit face forms cavity 35.

In the present embodiment (as shown in Figure 3), fan-shaped subtended angle is 48 °, and E face subtended angle is 2 °, and the result of emulation is among the HFSS: in 8GHz ~ 18GHz frequency range, the H ground roll beam width of antenna is 22.5 ° ± 5%, input vswr＜2, minor level＜15dB.

Claims

1. the horn antenna of a constant wave beam is characterized in that: comprise horn radiator (1), loudspeaker activation fragment (2), horn radiator (1) and loudspeaker activation fragment. (2) link to each other; Horn radiator is made up of loudspeaker sector (21), loudspeaker sector (21) has been introduced cylindrical bore face (25) for horn radiator (1), sector subtended angle (22) approximates the beamwidth of twice, sector radius (23) is much larger than the ratio of half-wavelength and sector subtended angle, at have an appointment 1 °～2 ° subtended angle of loudspeaker E face (24); Loudspeaker activation fragment (2) comprises transition ridge (31), coaxial outer conductor (32), coaxial inner conductor (33), rectangular waveguide (34), back cavity (35), transition ridge (31) one ends connect coaxial line, making its main mould impedance is about 50 Ω, coaxial outer conductor (32) is connected on the broadside of transition ridge (31), coaxial inner conductor (33) is connected on relative two transition ridges (31), and coaxial inner conductor (33) design is in the place near transition ridge (31) end; Transition ridge (31) other end connects rectangular waveguide (34), and transition ridge (31) cross sectional dimensions becomes greatly gradually, and the waveguide between excitation end and the short circuit face forms cavity (35).

2. the horn antenna of a kind of constant wave beam according to claim 1 is characterized in that: the double ridged waveguide of transition ridge (31) employing index gradual change form.