CN106058447B

CN106058447B - A Wide Bandwidth Beam Circularly Polarized Dielectric Resonator Antenna for X-Band

Info

Publication number: CN106058447B
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: 2019-02-15
Anticipated expiration: 2036-05-16
Also published as: CN106058447A

Abstract

The invention provides a wide-bandwidth beam circularly polarized dielectric resonator antenna suitable for X-band, which belongs to the field of antennas. It includes a dielectric substrate whose front is covered with a layer of metal patches, a rectangular dielectric resonator arranged on the metal patch, and an L-shaped feeding microstrip line arranged on the back of the dielectric substrate. By digging out four rectangular dielectric blocks of the same size at the four corners of the bottom of the rectangular dielectric resonator, and using a cross-shaped coupling slot and an L-shaped microstrip line for feeding, its broadband characteristics are realized. The antenna has the advantages of wide frequency band, low profile, easy processing, high stability of the pattern in the working frequency band and wide beam width.

Description

A kind of broadband and wide wave beam circularly polarized dielectric resonator antenna suitable for X-band

Technical field

The invention belongs to field of antenna, and in particular to a kind of broadband and wide wave beam circularly polarized dielectric resonance suitable for X-band Device antenna.The antenna has very wide impedance bandwidth and axial ratio bandwidth.

Background technique

Since dielectric resonator is proposed for radiating element, the research of dielectric resonator antenna has been received both at home and abroad Extensive concern.Because dielectric resonator antenna has, small in size, light-weight, loss is low, is easy to excitation, is excellent without surface wave excitation etc. Point, so having very high practical value.Under normal conditions, the circular polarisation bandwidth of dielectric resonator antenna is very narrow, and only 6% Left and right.As wireless communication is to bandwidth, required communication rate is stepped up, and studying has the medium of broadband circle polarized characteristic humorous Shake antenna, has very actual meaning to the development of wireless communication.

Currently, achieving some significant achievements about the research of broadband circle polarized dielectric resonator antenna both at home and abroad.It is logical Often there are two types of methods realizes circular polarisation using medium resonator antenna, first is that using SF single feed technology, second is that using feeding network The double-fed power 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 Non-isometric crossed slit is used in Antenna for Circular Polarization " to realize by feed microstrip line Circular polarisation, the structure is very simple, but its axial ratio bandwidth only has 3.91%.In " IEEE Microwave And Wireless Components Letters " 2006 years 8 phase papers " Offset Cross-Slot-Coupled Dielectric of volume 16 In Resonator Antenna for Circular Polarization ", equally uses non-isometric crossed slit and pass through Microstrip line offset-fed realizes that circular polarisation, which increase to circular polarisation bandwidth, reaches 6.3%, but its axial ratio bandwidth still compares It is narrow.In " Microwave and Optical Technology Letters " the 12 phase paper " Compact of volume 52 in 2010 Wideband Circularly Polarized Rectangular Dielectric Resonator Antenna With In Dual Underlaid Hybrid Couplers ", uses feeding network and carry out double-fed power technology, medium resonator antenna Axial ratio bandwidth be highly improved, but extremely complex feeding network makes the broadband advantage of antenna make a discount.

Summary of the invention

The invention proposes a kind of broadband and wide wave beam circularly polarized dielectric resonator antennas suitable for X-band, by square The Rectangular Enclosure with Participating Media block of four identical sizes is dug up at the angle of shape dielectric resonator bottom four, while using cross coupling gap and L Shaped microstrip line feed, to realize its broadband character.The antenna is with direction in broadband, low section, easy to process, working band The advantages that figure stability is high and beam angle is wide.

The technical solution adopted by the invention is as follows:

A kind of broadband and wide wave beam circularly polarized dielectric resonator antenna suitable for X-band, including front are covered with one layer of gold The medium substrate, the Rectangular Enclosure with Participating Media resonator on metal patch and the L shape set on the medium substrate back side for belonging to patch are fed Microstrip line, it is characterised in that: there are four the identical rectangular notches of size for four angles digging of dielectric resonator bottom；

The metal patch center is etched with cross coupling gap, parallel while corresponding with dielectric resonator；

The geometric center of the L shape feeding microstrip line and cross gap deviates, and feed port is located at medium substrate Edge, and by cross gap a gap reach another gap path length satisfaction make cross gap Two coupling minor matters generate the length of 90 degree of phase differences.

Compared with the prior art, the advantages of the present invention are as follows:

(1) dielectric resonator bottom by four rectangular notches be formed by cross-shaped structure with couple the cross in gap Structure coincides, and the energy for being coupled to resonator is more concentrated, the electric field of coupling physically formed 90 degree it is orthogonal.

(2) feeding classification for adding L shaped microstrip line using cross gap, has greatly widened the impedance bandwidth of antenna.

(3) cross-shaped structure of dielectric resonator bottom makes circular polarisation orthogonal modes be easier to motivate, and improves antenna 3dB axial ratio bandwidth.

(4) cross-shaped structure of dielectric resonator bottom makes electric field more be gathered in its edge, to the wave for increasing antenna Beam width has obviously effect.

(5) cross gap is fed by L shaped microstrip line, other than the basic mode for having motivated medium itself, moreover it is possible to motivate Two additional modes, to increase the impedance bandwidth of antenna.

(6) 90 degree of phase differences are generated at two gaps using L shape feeding microstrip line, compared to traditional by adjusting seam Gap length and for generating 90 degree of phase differences, the program has greater flexibility in subsequent adjusting.

Detailed description of the invention

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) It is antenna in the antenna pattern of 9.3GHz, Fig. 6 (b) is antenna pattern of the antenna in 9.6GHz, and Fig. 6 (c) is that antenna exists The antenna pattern of 9.9GHz, Fig. 6 (d) are antenna pattern of the antenna in 10.2GHz, and left side is radiation of the antenna in the face xoz Directional diagram, right side are antenna pattern of the antenna in the face yoz；Solid line represents LHCP in figure, and dotted line represents RHCP.

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

Specific embodiment

The broadband and wide wave beam circularly polarized dielectric suitable for X-band a kind of to specific embodiments of the present invention with reference to the accompanying drawing Resonant aerial is described in further detail.

It as shown in Figure 1, 2, include: positive covering suitable for the broadband and wide wave beam circularly polarized dielectric resonator antenna of X-band There are the square medium substrate of one layer of metal patch, the Rectangular Enclosure with Participating Media resonator on metal patch and is set to medium substrate The L shape feeding microstrip line at the back side；Wherein for medium substrate having a size of 100mm × 100mm × 0.5mm, selection is that opposite dielectric is normal Number is 3.5, the Taconic RF-35 that loss angle tangent is 0.0018；The length of dielectric resonator (material) is identical as wide size, It is highly 6.2mm for 6.8mm × 6.8mm, what is selected be relative dielectric constant is 9.2, and loss angle tangent is 0.0022 RogersTMM10, it is 2.1mm × 2.1mm × 1.1mm that four angles of dielectric resonator bottom, which are dug there are four length × width × height, Rectangular notch.

Metal patch center be etched with cross coupling gap, wherein Ls1 length be 5mm, line width 0.9mm, Ls2 length Central symmetry point for 5.1mm, line width 0.8mm, cross gap is overlapped with the central symmetry of medium block point.

L shape feeding microstrip line meets medium by the path length that a gap in cross gap reaches another gap Substrate dielectric constant is 3.5, with a thickness of 0.5mm, centre frequency be 10GHz in the case of generate 90 degree of phase differences needed for microstrip line Length, wherein Lf1 length is 6mm, line width 1.1mm, Lf2 length is 50.9mm, line width 1.1mm, with cross gap The distance sp2 of central point is 0.95mm.

The present invention feeds antenna by L shape feeding microstrip line, and energy passes through coupling through microstrip line from feed port In slot-coupled to dielectric resonator, cause the resonance of dielectric resonator, thus outside radiated electromagnetic wave.

The present invention increases antenna impedance bandwidth and axis by diging up four with size medium block in medium block bottom four corners Than bandwidth, cross-shaped structure and cross the coupling gap of medium block bottom are easy to the generation of orthogonal modes.

Fig. 3 is the impedance bandwidth simulation result of this example, as seen from the figure, antenna impedance bandwidth (< -10dB) range are as follows: 8.9-11.6GHz, relative bandwidth are as follows: 26.3%, therefore, which 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, which increases Beneficial range can guarantee that antenna works normally.Antenna gain maximum value is 6dBi, appears in the corresponding resonance point of diectric antenna size Near.

Fig. 5 is the axial ratio bandwidth simulation result of this example, as seen from the figure, antenna Circular polarization ratio bandwidth (< 3dB) range Are as follows: 9.16-10.69GHz, relative bandwidth are as follows: 15.4%, therefore, which has very wide 3dB axial ratio bandwidth.

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

In conclusion the performance indicator of inventive antenna is able to satisfy actual use demand, with very strong practical Value.

Claims

1. A wide-bandwidth beam circularly polarized dielectric resonator antenna suitable for X-band, comprising a dielectric substrate covered with a layer of metal patches on the front, a rectangular dielectric resonator arranged on the metal patches, and a dielectric substrate arranged on the back of the dielectric substrate; The L-shaped feeding microstrip line is characterized in that: the four corners of the bottom of the dielectric resonator are dug with four rectangular notches of the same size;

The center of the metal patch is etched with a cross-shaped coupling slot, and the side of the cross-shaped coupling slot is parallel to the side corresponding to the dielectric resonator;

The L-shaped feeding microstrip line deviates from the geometric center of the cross-shaped slot, its feeding port is located at the edge of the dielectric substrate, and the length of the path from one slot of the cross-shaped slot to the other slot is sufficient to make the cross-shaped slot reach. The two coupled branches produce a length that is 90 degrees out of phase.