CN212182535U - Novel butterfly-shaped slotted broadband terahertz antenna - Google Patents
Novel butterfly-shaped slotted broadband terahertz antenna Download PDFInfo
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- CN212182535U CN212182535U CN202020396776.0U CN202020396776U CN212182535U CN 212182535 U CN212182535 U CN 212182535U CN 202020396776 U CN202020396776 U CN 202020396776U CN 212182535 U CN212182535 U CN 212182535U
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Abstract
The utility model discloses a novel butterfly fluting broadband terahertz antenna belongs to the terahertz antenna field now. The antenna comprises a dielectric substrate, radiation patches and lumped port excitation, wherein each radiation patch comprises a central patch arranged in the center of the dielectric substrate, two patch wings respectively and symmetrically arranged on two sides of the central patch and a microstrip transmission line for connecting the central patch with the lumped port excitation, each central patch is circular, each patch wing is sector-shaped, a connecting line of the centers of the two patch wings penetrates through the center of the dielectric substrate, the microstrip transmission line is perpendicular to a connecting line of the centers of the two patch wings, a plurality of rectangular grooves are arranged on the sectors of the patch wings, openings are formed in the front ends of the sectors of all the rectangular grooves, and the rectangular grooves on the same patch wing are symmetrical about the symmetry line of the patch wing. The utility model discloses can realize the effect of dual-frenquency broadband, the frequency channel of design can satisfy terahertz frequency requirement now, and the range of application is wide, has simple structure, reasonable in design, miniaturized easy manufacturing's advantage.
Description
Technical Field
The utility model belongs to terahertz antenna field, specifically speaking relates to a novel butterfly fluting broadband terahertz antenna.
Background
Terahertz (THz) waves generally refer to electromagnetic waves having a frequency of 0.1 to 10THz (a wavelength in a range of 0.03 to 3 mm between microwave and infrared waves). Terahertz has characteristics of high frequency and ultrashort pulse (on the order of picoseconds), and thus has very high spatial resolution and temporal resolution. Terahertz energy is very small, and does not damage substances, so that the terahertz wave detector has more advantages than an X-ray technology in imaging and spectrum technologies. In addition, the vibration and rotational resonance frequencies of many biological macromolecules are also in the terahertz band. Therefore, the development of terahertz wave technology will have a profound impact on the technical development in a plurality of fields such as broadband communication, radar detection, electronic countermeasure, electromagnetic weapons, astronomy, and marker-free gene inspection.
Because the working frequency of the terahertz antenna is high, the requirements on the machining and assembling precision are strict, and the reasonable and effective antenna structure design is one of the technical problems to be solved urgently in terahertz antenna engineering. Due to the fact that terahertz wavelength in free space is small, radiation loss is large, requirements for dielectric materials and design structures of the antenna are high, and due to the fact that detection technology is not mature enough, the requirements for gain and directivity of the antenna are high.
In the case of antennas, reducing their size has become part of the research on communication devices. However, blindly reducing the size of the antenna can affect its index characteristics such as standing waves, gain, bandwidth, etc. The microstrip antenna has been widely researched and applied due to the advantages of light weight, small volume, low profile, easy conformality, low cost and the like, the bandwidth of the microstrip antenna is relatively narrow under the general condition, and the bandwidth of the common microstrip patch antenna is only about 20 MHz-30 MHz, so that the microstrip antenna is more limited in use.
The microstrip antenna also has a fixed multi-frequency characteristic, namely the same microstrip antenna can work on a plurality of discrete frequency working points, and the requirement of a plurality of communication frequency bands is met. The microstrip antenna has narrow bandwidth, so that the requirement on the accuracy of the working frequency point is more accurate, and any interference of the external environment can drift the frequency point of the microstrip antenna, so that the antenna cannot work normally.
At present, domestic and foreign researches find that the bandwidth of the microstrip antenna can be effectively widened by reducing an equivalent resonant circuit, adding a parasitic patch, adopting an LC resonant circuit, loading a short-circuit probe and adding an impedance matching network, and meanwhile, the bandwidth of the microstrip antenna can also be effectively widened by selecting a proper magnetic conductivity medium substrate and a corresponding dielectric constant to change different sizes and shapes or adopting a corresponding feeding method and a proper impedance matching. However, the above-mentioned method for increasing the bandwidth will affect the gain of the antenna at the same time, and cannot achieve both of them.
Disclosure of Invention
In order to solve the problems existing in the prior art, the utility model aims to provide a novel butterfly fluting broadband terahertz microstrip antenna has the butterfly characteristics, makes near the bandwidth of central frequency obtain expanding through special fluting, and the gain has obvious improvement simultaneously.
In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:
a novel butterfly slotted broadband terahertz antenna comprises a dielectric substrate, a radiation patch attached to the upper surface of the dielectric substrate and lumped port excitation arranged on the side surface of the dielectric substrate, the radiation patch comprises a central patch arranged in the center of the dielectric substrate, two patch wings respectively and symmetrically arranged on two sides of the central patch, and a microstrip transmission line connecting the central patch and the lumped port excitation, the central patch is circular, the patch wings are sector-shaped, the connecting line of the centers of the two patch wings passes through the center of the medium substrate, the microstrip transmission line is perpendicular to a connecting line of the centers of the two patch wings, a plurality of rectangular grooves are arranged on the sectors of the patch wings, openings are formed in the front ends of the sectors of all the rectangular grooves, and the rectangular grooves on the same patch wing are symmetrical about a symmetrical line of the patch wing.
Furthermore, the rectangular grooves are arranged along the direction perpendicular to the microstrip transmission line, and the bottom edges of the rectangular grooves on the same patch wing are positioned on the same straight line.
Furthermore, the number of the rectangular grooves on the same patch wing is five, including the first rectangular groove in the middle, and the two second rectangular grooves and the two third rectangular grooves on the two sides of the first rectangular groove.
Further, the first rectangular groove, the second rectangular groove and the third rectangular groove have different widths.
Furthermore, the dielectric substrate is in a cubic structure with the length of 0.8mm, the width of 0.8mm and the height of 0.1mm, and is made of silicon with the relative dielectric coefficient of 11.9.
Further, the radius of the central patch is 0.16 mm.
Further, the first rectangular groove has a length of 0.187mm and a width of 0.025mm, the second rectangular groove has a width of 0.02mm, and the third rectangular groove has a width of 0.01 mm.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses carry out corresponding expansion on butterfly-shaped basis, and combine together with the circular paster that the size is suitable, put respectively symmetrical 5 rectangular channels of 3 groups altogether of first rectangular channel, second rectangular channel, third rectangular channel that differ in width to radiation paster central point in both ends about radiation paster again, can improve the distribution and the reinforcing radiation intensity of electric current in the paster effectively, can improve the gain effectively when increasing the bandwidth, play the win-win effect.
(2) The utility model discloses a butterfly fluting broadband terahertz antenna adopts radiation paster, circular paster, opens the rectangular channel and lump port excitation isotructure to realize the effect of dual-frenquency broadband, and the frequency channel of design out can cover terahertz field now, has realized working at two frequency channels simultaneously, but also has simple structure, reasonable in design, miniaturized easy manufacturing's advantage, its range of application covers a great deal of fields such as communication, radar, medical treatment.
Drawings
Fig. 1 is a schematic structural diagram of the novel butterfly slotted broadband terahertz antenna of the present invention;
fig. 2 is a front schematic view of the novel butterfly-shaped slotted broadband terahertz antenna of the present invention (there is no design point on the back of the antenna, so the back schematic view is omitted);
in FIGS. 1 to 2: 1. a dielectric substrate; 2. a patch wing; 3. a central patch; 4. a rectangular groove; 401. a first rectangular groove; 402. a second rectangular groove; 403. a third rectangular groove; 5. lumped port excitation; 6. a microstrip transmission line.
FIG. 3 is a return loss simulation of the antenna;
FIG. 4 is a simulated voltage standing wave ratio diagram of the antenna;
FIG. 5 is a graph of gain versus frequency for an antenna;
FIG. 6 is a graph of the current intensity distribution on the surface of the antenna;
FIG. 7 is an E-plane and H-plane pattern for antenna 228.5 GHz;
FIG. 8 is a 3D gain pattern for antenna 228.5 GHz;
FIG. 9 is the E-plane and H-plane patterns of antenna 241.8 GHz;
fig. 10 is a 3D gain pattern for antenna 241.8 GHz.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
As shown in fig. 1 and 2, the novel butterfly-shaped slotted broadband terahertz antenna comprises a dielectric substrate 1, a radiation patch attached to the upper surface of the dielectric substrate 1, and a lumped port excitation 5 arranged on the side surface of the dielectric substrate 1, wherein the dielectric substrate 1 is a cubic insulating dielectric layer, the radiation patch comprises a central patch 3 arranged in the center of the dielectric substrate 1, two patch wings 2 respectively and symmetrically arranged on two sides of the central patch 3, and a microstrip transmission line 6 connecting the central patch 3 and the lumped port excitation 5, the central patch 3 is circular, the patch wings 2 are fan-shaped, and the whole butterfly-shaped terahertz antenna is formed. The connecting line of the centers of the two patch wings 2 passes through the center of the dielectric substrate 1, and the microstrip transmission line 6 is perpendicular to the connecting line of the centers of the two patch wings 2.
The sector of the patch wing 2 is provided with a plurality of rectangular grooves, the front ends of the sectors of all the rectangular grooves are provided with openings, and the rectangular grooves on the same patch wing 2 are symmetrical about the symmetry line of the patch wing. The rectangular groove is arranged along the direction vertical to the microstrip transmission line 6, and the bottom edge of the rectangular groove on the same patch wing 2 is positioned on the same straight line which is parallel to the microstrip transmission line 6. For any patch wing 2, one rectangular groove is located on the symmetry line of the patch wing 2, and a plurality of rectangular grooves with different widths are symmetrically formed from the rectangular groove to two sides respectively.
Examples
In this embodiment, a PCB is used as a dielectric substrate, and then an SMA connector is soldered. The dielectric substrate is a cubic structure with the length of 0.8mm, the width of 0.8mm and the height of 0.1mm, and is made of silicon with the relative dielectric coefficient of 11.9.
The longest dimension of the radiating patch (i.e., the distance between the farthest ends of the two patch wings) is 0.754mm, the widest dimension (i.e., the distance between the "head" and "tail" of the butterfly shape) is 0.561mm, and the radiating patch is made of copper.
In this embodiment, the radius of the central patch 3 is 0.16 mm. The number of the rectangular grooves on the same patch wing 2 is five, including a first rectangular groove 401 in the middle, two symmetrical second rectangular grooves 402 and two symmetrical third rectangular grooves 403 respectively on two sides of the first rectangular groove 401, the length of the first rectangular groove 401 is 0.187mm, the width of the first rectangular groove is 0.025mm, the width of the second rectangular groove 402 is 0.02mm, and the width of the third rectangular groove 403 is 0.01 mm.
The working principle is as follows: the main body part of the butterfly-shaped slotted broadband terahertz antenna is an insulating medium layer far smaller than the working wavelength, a central patch and a patch wing combined with the central patch are arranged in the center of the upper surface of the medium layer, the patch wing and the central patch feed jointly, the patch wing is combined in the central patch, and the double-frequency effect is achieved. 3 groups of 5 rectangular grooves with different widths are symmetrically formed in the patch wing respectively, so that the current distribution on the surface of the radiation patch is changed, the return loss of the radiation patch is reduced, and the ultra-wideband effect is realized. In thatIn the terahertz antenna, the obtained effect is very reasonable and has good usability, the return loss and the directivity have good effects, and the terahertz antenna is excited by adopting the lumped port under the condition of only considering the main mode excitation, and the input impedance matching is set to be 50 ohms so as to obtain good matching characteristics11<And when the power is minus 10dB, each frequency point can realize the double-frequency effect, namely the effect of double-frequency broadband is realized at the same time, and 228.5GHz and 241.8GHz can generally cover the terahertz field.
By carrying out HFSS simulation on the designed structure, various performance indexes of the terahertz antenna are tested, and the return loss, the current distribution, the directional diagram and the 3D gain diagram of the antenna are derived (see figures 3-10).
As shown in fig. 3, the return loss and the vswr of the antenna are in one-to-one correspondence, and in general, the return loss is-10 dB corresponding to the vswr of 2, and the vswr is less than 2, so that the return loss is lower than-10 dB. The return loss of the antenna is lower than-10 dB, which is a frequency band suitable for the antenna to work. And meanwhile, the lowest point of the antenna is lower than-20 dB, which shows that the antenna has the best performance in the working frequency band. Fig. 4 is a graph of the vswr simulation of the antenna.
The butterfly slotted broadband terahertz antenna adopts the patch wing and the central patch to feed, and combines the patch wing and the central patch properly, so that the double-frequency effect is realized, and then the rectangular grooves are formed in the patch wing. At S11When equal to-10 dB, fL＝219.08GHz，fH246.38GHz at fLAnd fHM, S11<-10dB, absolute bandwidth of antenna B ═ fH-fLThe terahertz antenna has the advantages that the bandwidth is remarkably increased compared with the prior art when the bandwidth is 27.3GHz and the relative bandwidth Br is 31%, the effect of the terahertz antenna can be realized in the broadband, meanwhile, the terahertz frequency band structure is covered, the application range of the terahertz frequency band structure covers a plurality of fields such as communication, radar and medical treatment, and the operation in two frequency bands is realized.
As shown in fig. 5, which is a graph of the gain of the antenna changing with frequency, the terahertz antenna obtains the maximum gain at about 242Ghz, and completely meets the design precision requirementWhile satisfying broadband characteristics; as shown in fig. 6, which is a surface current distribution diagram of the antenna radiation patch, the current radiation intensity is mainly concentrated at the left and right ends of the antenna and the rectangular slot, the current distribution is obviously improved, the current intensity is obviously improved, and the gain is improved at the same time; as shown in fig. 7 and 8, the return loss frequency is 228.5GHz, and the gain is maximum at 4.564dB at-40 ° for the main radiation; as shown in fig. 9 and 10, the return loss frequency is 241.8GHz, and the gain is maximum at-46 ° for main radiation, which is 5.9865dB, and the radiation effect is good. The 3D gain directional diagram of the two central frequency points can intuitively show that the radiation intensity of the antenna is obviously enhanced, the radiation range can realize fixed-point directional radiation, the range is larger, the main radiation area is positioned above 45 degrees of the antenna, and the size of the antenna has the characteristic of miniaturization, so that the antenna is very reasonable and practical in design and is S-shaped11<The dual-frequency antenna has the advantages of-10 dB, realization of dual-frequency effect at each frequency point, good working performance, excellent return loss and directivity, high practicability, simple structure, reasonable design and easiness in miniaturization.
Claims (5)
1. A novel butterfly slotted broadband terahertz antenna comprises a dielectric substrate (1), a radiation patch pasted on the upper surface of the dielectric substrate (1) and a lumped port excitation (5) arranged on the side surface of the dielectric substrate (1), and is characterized in that the radiation patch comprises a central patch (3) arranged in the center of the dielectric substrate (1), two patch wings (2) respectively and symmetrically arranged on two sides of the central patch (3) and a microstrip transmission line (6) connecting the central patch (3) and the lumped port excitation (5), the central patch (3) is circular, the patch wings (2) are sector-shaped, a connecting line of the centers of the two patch wings (2) penetrates through the center of the dielectric substrate (1), and the microstrip transmission line (6) is perpendicular to a connecting line of the centers of the two patch wings (2), the sector of the patch wing (2) is provided with a plurality of rectangular grooves, the front ends of the sectors of all the rectangular grooves are provided with openings, and the rectangular grooves on the same patch wing (2) are symmetrical about the symmetry line of the patch wing;
the rectangular grooves are arranged along the direction vertical to the microstrip transmission line (6), and the bottom edges of the rectangular grooves on the same patch wing (2) are positioned on the same straight line;
five rectangular grooves are formed in the same patch wing (2), and the five rectangular grooves comprise a first rectangular groove (401) in the middle, two second rectangular grooves (402) and two third rectangular grooves (403) which are respectively formed in two sides of the first rectangular groove.
2. The novel butterfly slotted broadband terahertz antenna of claim 1, wherein the widths of the first rectangular groove (401), the second rectangular groove (402) and the third rectangular groove (403) are different from each other.
3. The novel butterfly-shaped slotted broadband terahertz antenna as claimed in claim 1, wherein the dielectric substrate (1) is a cubic structure with a length of 0.8mm, a width of 0.8mm and a height of 0.1mm, and is made of silicon with a relative dielectric coefficient of 11.9.
4. The novel butterfly slotted broadband terahertz antenna according to claim 1, characterized in that the radius of the central patch (3) is 0.16 mm.
5. The novel butterfly slotted broadband terahertz antenna according to claim 4, wherein the length of the first rectangular slot (401) is 0.187mm, the width is 0.025mm, the width of the second rectangular slot (402) is 0.02mm, and the width of the third rectangular slot (403) is 0.01 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020396776.0U CN212182535U (en) | 2020-03-25 | 2020-03-25 | Novel butterfly-shaped slotted broadband terahertz antenna |
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| CN202020396776.0U CN212182535U (en) | 2020-03-25 | 2020-03-25 | Novel butterfly-shaped slotted broadband terahertz antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446538A (en) * | 2020-03-25 | 2020-07-24 | 昆山盛创科技有限公司 | Novel butterfly-shaped slotted broadband terahertz antenna |
| CN113113768A (en) * | 2021-03-22 | 2021-07-13 | 南京林业大学 | Symmetric multi-slot terahertz 6G communication application frequency band antenna based on butterfly-like structure |
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2020
- 2020-03-25 CN CN202020396776.0U patent/CN212182535U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111446538A (en) * | 2020-03-25 | 2020-07-24 | 昆山盛创科技有限公司 | Novel butterfly-shaped slotted broadband terahertz antenna |
| CN113113768A (en) * | 2021-03-22 | 2021-07-13 | 南京林业大学 | Symmetric multi-slot terahertz 6G communication application frequency band antenna based on butterfly-like structure |
| CN113113768B (en) * | 2021-03-22 | 2022-07-01 | 南京林业大学 | Symmetric multi-slot terahertz 6G communication application frequency band antenna based on butterfly-like structure |
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