TW201417401A - Multi-frequency resonant antenna - Google Patents

Abstract

The present invention is a multi-frequency resonant antenna, including a dielectric substrate, a system ground plane disposed on the dielectric substrate, a clearance region at the non-corner and an antenna body disposed in the clearance region. The antenna body includes a capacitive chip and a plurality of radiation sections, wherein the radiation sections constitute a first resonance mode component and a second resonance mode component to provide different first and second resonant frequency respectively, satisfying multiple frequency band using requirements of communication products.

Description

Multi-frequency resonant antenna

The present invention relates to a wireless communication component, and more particularly to a multi-frequency resonant antenna.

In today's communication products, in addition to the desired size and lightness, it is expected to be versatile, so that not only the circuit design becomes more complicated, but also the number of components used is relatively increased. When the size of the communication product is reduced, the internal space in which the electronic component can be placed is also reduced, so the internal component must also be continuously reduced in size.

Antennas are indispensable components in communication products, and are currently dominated by built-in antennas. Generally, the monopole antenna is mainly placed at the corner of the communication product. With the development and demand of communication, the antenna design of the non-corner interval must be considered in space, that is, the position of the antenna element is no longer limited to the corner.

Although the slot antenna can be no longer limited to the corner section, it is still a single-frequency resonance mechanism in terms of operation function. The function of multi-frequency operation in the case where the position and space are limited remains to be developed.

In view of the limitations of the design of existing antenna elements, such as functions, placement locations, etc., the primary object of the present invention is to provide a multi-frequency resonant antenna that can be no longer limited to the corners of the substrate and that can provide multi-band applications.

To achieve the foregoing objective, the multi-frequency resonant antenna of the present invention comprises: a dielectric substrate having a first side and an opposite second side; a system ground plane formed on a surface of the dielectric substrate, the system A clearing area is disposed at a non-corner of the grounding surface; an antenna body is disposed on the dielectric substrate and located inside the clearing area, wherein the antenna body comprises: a first radiating section having a position in the clearing area a starting end of the first radiating section extending from a first side toward the first side of the dielectric substrate, the starting end as a feeding end; and a second radiating section from the first radiating section relative to the starting end The other end extends along the first side of the dielectric substrate and is perpendicularly connected to the first radiating section; a third radiating section is L-shaped and includes a horizontal portion and a vertical portion, the horizontal portion is tied a first side of the dielectric substrate extending in a direction opposite to the second radiating section and connecting the first radiating section, the vertical portion extending perpendicularly from the end of the horizontal portion and parallel to the second radiating section; a capacitive wafer, Connected between the system ground plane and the second radiating section; a feeding component, the positive end of the feeding component is connected to the feeding end of the first radiating section, and the negative end of the feeding component is connected to System ground plane.

The antenna structure described above respectively provides a lower and a higher resonant mode, and the resonant principle of the first resonant mode of the lower frequency is that the current signal is fed from the feed end via the first radiating section and the second radiating section and The capacitive chip is coupled to the ground plane to achieve a resonance mechanism with a quarter-wave current path; in addition, the resonance principle of the second resonance mode of the higher frequency flows through the first radiation segment from the feed end by the current signal and a third radiating section that achieves a resonance mechanism with a current path of a quarter-wavelength of the monopole antenna; wherein the capacitive mode on the first resonant path The efficiency of the chip, the third radiant section of the second resonant path, and the ground plane of the system can be a capacitive coupling adjustment mechanism.

The clearance area of the invention is no longer limited to the corners of the substrate, and the finite substrate area can be effectively utilized, and the design flexibility is higher when other electronic parts are disposed; in addition, the complete clearance area can be accommodated in a small range. The antenna body will contribute to the volume reduction of the product; the first resonant frequency and the second resonant frequency can satisfy the multi-band requirement communication product, and the appropriate components can be easily obtained when fine-tuning the constituent elements in the antenna main body Resonance frequency.

Referring to FIGS. 1 and 2, an overall plan view of the multi-frequency resonant antenna of the present invention includes a dielectric substrate 10, a system ground plane 20, and an antenna body 30.

The system ground plane 20 is formed on the surface of the dielectric substrate 10, and a clearing region is formed at a non-corner edge of the system ground plane 20, and the clearance region extends from one side of the dielectric substrate 10 to the middle of the system ground plane 20. That is, facing the opposite sides of the dielectric substrate 10. The entire clearance area is divided into a first clearance portion 21 and a second clearance portion 22 by using a short-circuiting wire 25, and the short-circuiting wire 25 is formed with a plurality of slits to form a curved wire, and each slit is used as a slit. The slot has a first slot 23 and a second slot 24, and the first slot 23 is parallel to the second slot 24.

One side of the first clearance portion 21 communicates with the first slot 23, the first slot 23 extending from the first clearance portion 21 toward the second clearance portion 22; and one from the second clearance portion 22 The second slot 24 is communicated with the second slot 24, and the second slot 24 extends from the second clearance portion 22 toward the first clearance portion 21.

The antenna body 30 is disposed on the dielectric substrate 10 and is located in the clearance area. The antenna body 30 includes a first radiating section 31, a second radiating section 32, a third radiating section 33, and a capacitive wafer 34. The first to third radiant sections 33 are all formed in the clearance area and are not connected to the system ground plane 20; a first conductive contact 351 and a second conductive contact 352 are disposed in the clearance area, and two conductive The spacing between the contacts 351 and 352 is matched with the size of the capacitive chip 34 for electrically connecting the capacitive chip 34. The first conductive contact 351 is also connected to one end of the short-circuiting wire 26, and the short-circuiting wire 26 is connected. The other end is connected to the system ground plane 20, and the second conductive contact 352 is electrically connected to the system ground plane 20.

The first radiant section 31 extends from the clearance area in a direction toward the first side of the dielectric substrate 10 and is formed in the first clearance portion 21; the second radiant section 32 is from the first radiant section 31 The end extends along the first side of the dielectric substrate 10 and is perpendicularly connected to the first radiating section 31. The second radiating section 32 is also located within the first clearance 21, and the end of the second radiating section 32 is electrically connected to the first a conductive contact 351; the third radiating section 33 is L-shaped and includes a horizontal portion and a vertical portion, wherein the horizontal portion is connected to the first radiating portion 31 to face away from the second radiating portion 32. The direction extends along a first side of the dielectric substrate 10, the vertical portion extending perpendicularly from the end of the horizontal portion and parallel to the first radiant section 31.

The capacitive chip 34 is located in the second clearance portion 22 and is connected between the other end of the second radiating portion 32 and the system ground plane 20. Specifically, the capacitive wafer 34 is connected to the first conductive contact. Between 351 and the second conductive contact 352.

Referring to FIG. 1 and FIG. 3, the starting end of the first radiating section 31 is taken as a feed end for connection to a feed element 40 having a positive end and a negative end, wherein the positive end of the feed element 40 is coupled to the feed end of the first radiating section 31, and the feed element 40 The negative terminal is connected to the system ground plane 20. The feed element 200 in this embodiment is a single feed line, and other elements for signal feed function can also be applied to the present invention.

The first radiating section 31 and the second radiating section 32 form an L-shaped radiating plane segment. As the first resonant mode component of the present invention, the capacitive chip 34 can provide low frequency resonance, and the current signal is fed by the feeding end. Via the first radiant section 31, the second radiant section 32, and the capacitive wafer 34 coupled to the ground plane 20, a resonant mechanism is achieved with a quarter wavelength current path. On the other hand, the first radiating section 31 and the L-shaped third radiating section 33 constitute an inverted U-shaped radiating plane section. As the second resonant mode component of the present invention, the current signal is transmitted from the feeding end via the first radiation. The segment 31 and the third radiant section 33 achieve a higher frequency resonance mechanism with a quarter-wavelength current path of the monopole antenna.

When the present invention uses the capacitive wafer 34 of different capacitance values, the frequency of the low frequency resonance point (F1) and the frequency of the high frequency resonance point (F2) can be adjusted, and the frequency ratio of the two frequencies (F1, F2) can be adjusted. Please refer to the table below. The table provides the corresponding low frequency and high frequency resonance frequency values when the capacitance value changes from 0.75 to 0.3.

Referring to FIG. 4, if the length L1 of the second clearance portion 22 is changed, the frequency of the low frequency resonance of the present invention can be adjusted. When the length value L1 is gradually decreased, the frequency point is gradually increased in an inverse relationship.

Referring to FIG. 5 again, if the width L2 of the second clearance portion 22 is changed, the frequency of the low frequency resonance of the present invention can be adjusted as well. When the width value L2 is gradually decreased, the frequency point is gradually increased in an inverse relationship.

Referring to FIG. 6, if the length of the second slot 24 is changed, the purpose of adjusting the low frequency resonance frequency can be achieved. When the length of the second slot 24 is gradually decreased, the frequency will gradually increase.

As shown in FIG. 7, when the present invention changes the length of the vertical portion of the third radiating section 33, the inductivity of the antenna can be increased, thereby adjusting the frequency point of the present invention at the high frequency resonance, when the length L3 of the vertical portion is increased, The frequency is relatively low.

In addition, referring to FIG. 2, the vertical portion of the third radiating section 33 is maintained at a horizontal interval L4 from the edge of the system ground plane 20. When the horizontal spacing L4 is adjusted, the capacitance of the antenna can be controlled, and the effect of changing the high frequency resonant frequency can also be achieved. Referring to FIG. 8, when the horizontal spacing L4 is smaller, the corresponding high frequency resonant frequency will be The higher.

In summary, the multi-frequency resonant antenna of the present invention can provide multi-frequency operating frequency to meet the design requirements of modern communication products, whether it is a low-frequency resonant frequency or high, compared with the conventional single-frequency operation of the capacitive coupling antenna. The frequency resonance frequency can be flexibly adjusted, and has better circuit design flexibility. For example, different resonant wafers, length of the radiant section or spacing between the radiant section and the system ground plane can be used to change the resonant frequency of the present invention. In addition, the antenna body of the present invention occupies only a small area, which helps to reduce the volume of the communication product. In a preferred embodiment, the clearance area is only used. 10mm x 6mm can accommodate the complete antenna body, which can bring about obvious improvement in the development of communication applications.

10‧‧‧Media substrate

20‧‧‧System ground plane

21‧‧‧First Clearance Department

22‧‧‧Second clearance department

23‧‧‧First slot

24‧‧‧Second slot

25‧‧‧Short wire

30‧‧‧Antenna body

31‧‧‧First radiant section

32‧‧‧second radiant section

33‧‧‧third radiant section

34‧‧‧Capacitive chip

351‧‧‧First conductive contact

352‧‧‧Second conductive contacts

40‧‧‧Feed components

Figure 1: A plan view of a multi-frequency resonant antenna of the present invention.

Figure 2 is a partially enlarged plan view of the multi-frequency resonant antenna of the present invention.

Fig. 3 is a partially enlarged plan view showing the multi-frequency resonant antenna of the present invention when the feed line is not connected.

Figure 4: The present invention changes the second clearance width L1, thereby changing the waveform of the low frequency resonance point.

Fig. 5: The present invention changes the second clearance portion width L2, thereby changing the waveform diagram of the low frequency resonance point.

Figure 6: The present invention changes the length of the second slot, thereby changing the waveform of the low frequency resonance point.

Figure 7: The present invention changes the length of the third radiant section, thereby changing the waveform of the high frequency resonant point.

Figure 8: The present invention changes the horizontal spacing L4 of the third radiant section from the system ground plane, thereby changing the waveform of the high frequency resonance point.

20‧‧‧System ground plane

21‧‧‧First Clearance Department

22‧‧‧Second clearance department

23‧‧‧First slot

24‧‧‧Second slot

25‧‧‧Short wire

30‧‧‧Antenna body

31‧‧‧First radiant section

32‧‧‧second radiant section

33‧‧‧third radiant section

34‧‧‧Capacitive chip

351‧‧‧First conductive contact

352‧‧‧Second conductive contacts

40‧‧‧Feed components

Claims (10)

A multi-frequency resonant antenna includes: a dielectric substrate having a first side and an opposite second side; a system ground plane formed on a surface of the dielectric substrate, the edge of the system being non-edge A clearing area is disposed at the corner; an antenna body is disposed on the dielectric substrate and located inside the clearing area, wherein the antenna body comprises: a first radiating section having a starting end located in the clearing area, The first radiating section extends from a first side toward the first side of the dielectric substrate, the starting end as a feeding end; and a second radiating section from the other end of the first radiating section with respect to the starting end a first side of the dielectric substrate extends and is perpendicularly connected to the first radiating section; a third radiating section is L-shaped and includes a horizontal portion and a vertical portion, the horizontal portion is along the dielectric substrate a first side extending in a direction opposite to the second radiating section and connecting the first radiating section, the vertical portion extending perpendicularly from the end of the horizontal portion and parallel to the second radiating section; a capacitive wafer connected to the system ground plane And the second Between the radiant sections; a feed element connected to the feed end. The multi-frequency resonant antenna of claim 1, wherein: the first empty conductive contact and the second conductive contact are disposed in the clearance area, and the first capacitive contact is connected to the first conductive contact and the second Between the conductive contacts, the second conductive contact is electrically connected to the system ground point; The clearance area is divided into a first clearance portion and a second clearance portion by a short-circuited conductor; a section of the short-circuited conductor is connected to the first conductive contact, and the other end is connected to the system ground plane; the first radiating section and the second The radiant section and the third radiant section are located in the first clearance portion, and the end section of the second radiant section is connected to the first conductive joint. The multi-frequency resonant antenna according to claim 2, wherein the short-circuiting wire is formed with a plurality of parallel slits to form a curved wire, and the slit serves as a first slot and a second slot, respectively; One side of a clearance portion is connected to the first slot, the first slot extends from the first clearance portion toward the second clearance portion; and one side of the second clearance portion is connected to the second slot The second slot extends from the second clearance portion toward the first clearance portion. The multi-frequency resonant antenna according to claim 1, 2 or 3, wherein the feeding element has a positive end and a negative end, wherein the positive end of the feeding element is connected to the feeding end of the first radiating section, and the feeding element The negative terminal is connected to the system ground plane. The multi-frequency resonant antenna according to claim 4, wherein the first radiating section and the second radiating section form an L-shaped radiating plane segment as a first resonant mode component to provide a first resonant frequency; The first radiating section and the third radiating section form an inverted U-shaped radiating plane segment as a second resonant mode component to provide a second resonant frequency; wherein the second resonant frequency is higher than the first resonant frequency . The multi-frequency resonant antenna of claim 3, wherein the first resonant frequency is adjustable according to at least one of a length of the second clearance portion, a width of the second clearance portion, or a length of the second slot; The second resonant frequency may be adjusted according to the length of the vertical portion of the third radiating segment or the spacing distance between the vertical portions and the system ground plane. The multi-frequency resonant antenna of claim 4, wherein the ratio of the first resonant frequency to the second resonant frequency is adjustable by changing a capacitance of the capacitive chip. The multi-frequency resonant antenna of claim 5, wherein the ratio of the first resonant frequency to the second resonant frequency is adjustable by changing a capacitance of the capacitive chip. The multi-frequency resonant antenna of claim 6, wherein the ratio of the first resonant frequency to the second resonant frequency is adjustable by changing a capacitance of the capacitive chip. The multi-frequency resonant antenna of claim 4, wherein the feed element is a single feed line.