CN106058447A

CN106058447A - Wideband wide beam circular polarization medium resonator antenna suitable to X wave band

Info

Publication number: CN106058447A
Application number: CN201610322287.9A
Authority: CN
Inventors: 肖绍球; 熊义高; 张超
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2016-05-16
Filing date: 2016-05-16
Publication date: 2016-10-26
Anticipated expiration: 2036-05-16
Also published as: CN106058447B

Abstract

The invention provides a wideband wide beam circular polarization medium resonator antenna suitable to X wave band, and belongs to the field of antennas. The antenna includes a medium substrate of which the right side is covered with a layer of metal surface mount device, a rectangular medium resonator which is arranged on the metal surface mount device, and an L-shaped feed microstrip antenna which is arranged on the back side of the medium substrate. The 4 corners of the bottom part of the rectangular medium resonator are dug out 4 same dimension rectangular medium blocks, and cross-slot-coupled the L-shaped microstrip antenna feed are adopted, so that the features of the wideband of the antenna area realized. The antenna is advantaged by wide frequency band, low profile, easiness to process, high stability of directional diagram within the working frequency band and wide wave beam width.

Description

A kind of broadband and wide wave beam circularly polarized dielectric resonator antenna being applicable to X-band

Technical field

The invention belongs to field of antenna, be specifically related to a kind of broadband and wide wave beam circularly polarized dielectric resonance being applicable to X-band Device antenna.This antenna has the widest impedance bandwidth and axial ratio bandwidth.

Background technology

Since dielectric resonator is proposed for radiating element, the research to dielectric resonator antenna both at home and abroad receives Pay close attention to widely.Because dielectric resonator antenna has, volume is little, lightweight, it is low to be lost, be prone to excitation, excellent without surface wave excitation etc. Point, so having the highest practical value.Under normal circumstances, the circular polarisation bandwidth of dielectric resonator antenna is the narrowest, and only 6% Left and right.Along with radio communication is to bandwidth, stepping up of required communication rate, the medium that research has broadband circle polarized characteristic is humorous Shake antenna, and the development to radio communication has actual meaning.

At present, research about broadband circle polarized dielectric resonator antenna both at home and abroad achieves some significant achievements.Logical Often having two kinds of methods to utilize medium resonator antenna to realize circular polarisation, one is to use SF single feed technology, and two is to use feeding network The duplex feeding technology of composition." IEEE Transactions On Antennas And Propagation " 1999 the 47th Roll up 7 phase papers " Cross-Slot-Coupled Microstrip Antenna and Dielectric Resonator Antenna for Circular Polarization " in have employed non-isometric crossed slit and realized by feed microstrip line Circular polarisation, this structure is very simple, but its axial ratio bandwidth only has 3.91%.At " IEEE Microwave And Wireless Components Letters " 2006 years volume 16 8 phase papers " Offset Cross-Slot-Coupled Dielectric Resonator Antenna for Circular Polarization " in, have employed non-isometric crossed slit equally and pass through Microstrip line offset-fed realizes circular polarisation, and circular polarisation bandwidth is increased by which, reaches 6.3%, but its axial ratio bandwidth still compares Narrow.At " Microwave and Optical Technology Letters " volume 52 12 phase paper " Compact in 2010 Wideband Circularly Polarized Rectangular Dielectric Resonator Antenna With Dual Underlaid Hybrid Couplers " in, have employed feeding network and carry out duplex feeding technology, medium resonator antenna Axial ratio bandwidth be highly improved, but the broadband advantage that extremely complex feeding network makes antenna is made a discount.

Summary of the invention

The present invention proposes a kind of broadband and wide wave beam circularly polarized dielectric resonator antenna being applicable to X-band, by square Bottom shape dielectric resonator, the Rectangular Enclosure with Participating Media block of four same sizes is dug up at four angles, uses cross coupling gap and L simultaneously Shaped microstrip line feeds, to realize its broadband character.This antenna has broadband, low section, is prone to direction in processing, working band The advantages such as figure stability height and beam angle width.

The technical solution used in the present invention is as follows:

A kind of broadband and wide wave beam circularly polarized dielectric resonator antenna being applicable to X-band, is coated with one layer of gold including front Belong to the medium substrate of paster, the Rectangular Enclosure with Participating Media resonator being located on metal patch and the L-shaped feed being located at the medium substrate back side Microstrip line, it is characterised in that: four equivalently-sized rectangular indentation are dug at four angles bottom dielectric resonator；

Described metal patch center is etched with cross coupling gap, and the limit corresponding with dielectric resonator, its limit is parallel；

Described L-shaped feeding microstrip line deviates with the geometric center in cross gap, and its feed port is positioned at medium substrate Edge, and the path arriving another gap through a gap in cross gap meets and makes cross gap Two coupling minor matters produce the length of 90 degree of phase contrasts.

Compared with prior art, it is an advantage of the current invention that:

(1) by four the rectangular indentation decussate texture formed and the crosss coupling gap bottom dielectric resonator Structure coincides, and the energy being coupled to resonator is more concentrated, the electric field of coupling formed physically 90 degree orthogonal.

(2) use cross gap to add the feeding classification of L-shaped microstrip line, greatly widen the impedance bandwidth of antenna.

(3) decussate texture bottom dielectric resonator makes circular polarisation orthogonal modes be easier to excitation, improves antenna 3dB axial ratio bandwidth.

(4) decussate texture bottom dielectric resonator makes electric field be gathered in its edge more, to the ripple increasing antenna Beam width has obviously effect.

(5) L-shaped feed microstrip line is passed through in cross gap, in addition to having encouraged the basic mode of medium itself, moreover it is possible to encourage Two extra patterns, to increase the impedance bandwidth of antenna.

(6) use L-shaped feeding microstrip line to produce 90 degree of phase contrasts at two gaps, stitched by adjustment compared to traditional Gap length and for producing 90 degree of phase contrasts, the program has greater flexibility in follow-up regulation.

Accompanying drawing explanation

Fig. 1 is the top view of the embodiment of the present invention；

Fig. 2 is the side view of the embodiment of the present invention；

Fig. 3 is the return loss plot figure of the embodiment of the present invention；

Fig. 4 is the gain curve figure of the embodiment of the present invention；

Fig. 5 is the axial ratio bandwidth figure of the embodiment of the present invention；

Fig. 6 is the far field circular polarization radiation directional diagram of four different frequent points of antenna of the embodiment of the present invention, wherein Fig. 6 (a) For antenna at the antenna pattern of 9.3GHz, Fig. 6 (b) is the antenna antenna pattern at 9.6GHz, and Fig. 6 (c) is that antenna exists The antenna pattern of 9.9GHz, Fig. 6 (d) is the antenna antenna pattern at 10.2GHz, and left side is the antenna radiation in xoz face Directional diagram, right side is the antenna antenna pattern in yoz face；In figure, solid line represents LHCP, and dotted line represents RHCP.

Drawing reference numeral illustrates: 1 dielectric resonator；2 coupling gaps；3L shape feeding microstrip line；4 rectangular indentation；5 feed ends Mouthful；6 metal patches；7 medium substrates.

Detailed description of the invention

A kind of broadband and wide wave beam circularly polarized dielectric being applicable to X-band of specific embodiment to the present invention below in conjunction with the accompanying drawings Resonant aerial is described in further detail.

As shown in Figure 1, 2, it is adaptable to the broadband and wide wave beam circularly polarized dielectric resonator antenna of X-band includes: front covers The square medium substrate, the Rectangular Enclosure with Participating Media resonator being located on metal patch that have layer of metal paster and be located at medium substrate The L-shaped feeding microstrip line at the back side；Wherein medium substrate a size of 100mm × 100mm × 0.5mm, selection is that relative dielectric is normal Number is 3.5, and loss angle tangent is the Taconic RF-35 of 0.0018；The length of dielectric resonator (material) is equivalently-sized with wide, For 6.8mm × 6.8mm, height is 6.2mm, selection be relative dielectric constant be 9.2, loss angle tangent is 0.0022 RogersTMM10, four angles bottom dielectric resonator are dug four length × width × heights and are 2.1mm × 2.1mm × 1.1mm's Rectangular indentation.

Metal patch center is etched with cross coupling gap, and wherein a length of 5mm of Ls1, live width are 0.9mm, Ls2 length Being 0.8mm for 5.1mm, live width, the centrosymmetry point in cross gap overlaps with the centrosymmetry point of medium block.

The path that L-shaped feeding microstrip line arrives another gap through a gap in cross gap meets medium Substrate dielectric constant is 3.5, thickness is 0.5mm, mid frequency is to produce the microstrip line needed for 90 degree of phase contrasts in the case of 10GHz Length, wherein a length of 6mm of Lf1, live width be a length of 50.9mm of 1.1mm, Lf2, live width be 1.1mm, itself and cross gap Distance sp2 of central point is 0.95mm.

Antenna is fed by the present invention by L-shaped feeding microstrip line, and energy passes through coupling from feed port through microstrip line Slot-coupled in dielectric resonator, causes the resonance of dielectric resonator, thus outwards radiated electromagnetic wave.

The present invention digs up four by corner bottom medium block increases antenna impedance bandwidth and axle with size medium block Ratio bandwidth, decussate texture and cross bottom medium block couple gap and are prone to the generation of orthogonal modes.

Fig. 3 is the impedance bandwidth simulation result of this example, and as seen from the figure, antenna impedance bandwidth (<-10dB) scope is: 8.9-11.6GHz, relative bandwidth is: 26.3%, and therefore, this antenna has wider bandwidth of operation.

Fig. 4 is the gain simulation result of this example, and as seen from the figure, antenna gain is maintained at 2.9dBi-6dBi, and this antenna increases Benefit scope can guarantee that antenna normally works.Antenna gain maximum is 6dBi, occurs in the resonance point that diectric antenna size is corresponding Near.

Fig. 5 is the axial ratio bandwidth simulation result of this example, as seen from the figure, antenna Circular polarization ratio bandwidth (< 3dB) scope For: 9.16-10.69GHz, relative bandwidth is: 15.4%, and therefore, this antenna has the widest 3dB axial ratio bandwidth.

Fig. 6 is this example antenna far field circular polarization radiation directional diagram at four different frequent points, as seen from the figure, the master of antenna Polarised direction is LHCP (Left-Hand Circular Polarization).Four different frequency 9.3GHz, At 9.6GHz, 9.9GHz, 10.2GHz, main polarization (LHCP) of antenna is than cross polarization (RHCP < Right-Hand Circular Polarization >) high about 20dB, there is good circular polarization radiation characteristic.And at four different frequencies At Dian, the beam angle of antenna all can reach ± about 50 °, and directional diagram is stable.

In sum, the performance indications of inventive antenna all can meet the use demand of reality, has the strongest practicality It is worth.

Claims

1. it is applicable to a broadband and wide wave beam circularly polarized dielectric resonator antenna for X-band, is coated with layer of metal including front The medium substrate of paster, the Rectangular Enclosure with Participating Media resonator being located on metal patch and the L-shaped feed being located at the medium substrate back side are micro- Band wire, it is characterised in that: four equivalently-sized rectangular indentation are dug at four angles bottom dielectric resonator；

Described L-shaped feeding microstrip line deviates with the geometric center in cross gap, and its feed port is positioned at the limit of medium substrate Edge, and the path arriving another gap through a gap in cross gap meets and makes two of cross gap Coupling minor matters produce the length of 90 degree of phase contrasts.