TWI553962B - Multimode monopole antenna - Google Patents

Description

Multimode monopole antenna

The present invention relates to a multi-modal monopole antenna, and more particularly to an antenna conforming to WLAN 2.45 GHz, 5.2 GHz, 5.8 GHz multi-band and WiMAX 2.5 GHz, 5.25 GHz applications, mainly by simple planar printing design. And the passive component characteristic path is effectively applied to miniaturized wireless devices to achieve good gain and radiation field characteristics.

According to the rapid development of communication technology and the increasing popularity of electronic products, wireless signal transmission has developed many communication protocols and technologies, and the demand for wireless communication is increasing day by day, and all the handheld mobile devices are desired. For example, PDAs, smart phones or tablets can transmit and receive signals in different frequency bands for more powerful communication functions. Generally, dual- or tri-band antennas are usually installed in handheld mobile devices. Effectively realizes the function of transmitting and receiving signals of different frequency bands, and the form of antennas is ever-changing, and can be divided into four categories. One is wire antennas, and the common ones are monopoles, dipoles, and circuits. Antennas, etc.; second, aperture antennas, common horn antennas and slotted antennas; third, printed antennas, such as microstrip antennas ( Micro-strip) with printed dipoles, etc.; finally, reflector antennas; in addition, today's handheld operations Communication band based on the low-frequency counter is used LTE700MHz, GSM850/900MHz, and high-frequency DCS1800MHz, PCS1900MHz and LTE2300/2500MHz, etc.; however, the above-mentioned conventional antenna can only be used for transmitting and receiving signals in two or three frequency bands, and cannot cover other common frequency bands.

Moreover, although many monopole antennas used in multi-bands have been developed today, in order to meet the requirements of multi-band, single-frequency antennas are usually designed to increase the bending and floating metal structures to reduce the antenna. Size and increase the current path on the antenna; however, the use of the bending design in the antenna technology can increase the current path, and can also achieve the miniaturization demand, but has no small impact on the gain of the antenna and the floating field type. The radiation field type and gain will be forced to change due to the increase in the number of bends, and the better omnidirectional radiation pattern and gain cannot be achieved; therefore, how to effectively achieve the better by simple multi-band antenna design and architecture Radiation pattern and gain are still the subject of continuous improvement and resolution by researchers such as wireless communication developers and related academic institutions.

Nowadays, the inventor has made many improvements in the actual implementation of the existing antenna. It is a tireless spirit and is improved by its rich professional knowledge and years of practical experience. The present invention was developed.

The main object of the present invention is to provide a multi-modal monopole antenna, especially an antenna conforming to WLAN 2.45 GHz, 5.2 GHz, 5.8 GHz multi-band and WiMAX 2.5 GHz, 5.25 GHz applications, mainly by simple planar printing. Design and passive component characteristic paths are effectively applied to miniaturized wireless devices to achieve good gain and radiation field characteristics.

In order to achieve the above implementation, the inventors propose a multi-modal monopole antenna comprising at least one dielectric substrate, a ground plane, a feed end, and a metal loop radiation portion; the dielectric substrate has a first The grounding surface is disposed on the first surface for signal grounding, wherein the grounding surface is extended with an L-shaped first extending portion, and the first extending portion is further connected with a second extension of the L shape. Ministry, in the second a third extending portion is formed in the longitudinal direction of the extending portion, and a lateral protruding portion is further disposed on the third extending portion, and the grounding surface is recessed on the other side of the corresponding first extending portion. a feeding end point is disposed on the first surface and connected to the corresponding slot of the grounding surface; the metal loop radiating portion is connected to the feeding end point, wherein the metal loop radiating portion is provided with a braided shape The fourth extending portion extends from the end of the fourth extending portion away from the first extending portion to form a fifth extending portion.

The multi-modal monopole antenna as described above, wherein the multi-mode monopole antenna occupies an area of 45 x 5 mm ² .

A multi-modal monopole antenna as described above, wherein the dielectric substrate is an FR4 epoxy glass fiber substrate.

The multimodal monopole antenna as described above, wherein the FR4 epoxy glass fiber substrate has a thickness of 1.6 mm, a relative permittivity of 4.4, and a loss tangent of 0.0245.

The multi-modal monopole antenna as described above, wherein the area occupied by the ground plane is 35 × 5 mm ² .

The multi-modal monopole antenna as described above, wherein the metal loop radiating portion is formed on the first surface in one of printing or etching manner.

The multi-modal monopole antenna as described above, wherein the metal loop radiating portion occupies an area of 10 × 5 mm ² .

Therefore, the multi-modal monopole antenna of the present invention can effectively reduce the manufacturing cost and the difficulty of the manufacturing process by using a simple planar printed antenna design, and can be applied to various small-sized miniaturized mobile devices. Achieving good gain and radiation field characteristics; in addition, the multi-modal monopole antenna of the present invention effectively meets the requirements of a miniaturized wireless mobile device by using an overall antenna area of only 45 × 5 mm ² , and the present invention has many The modal monopole antenna has a path of passive component characteristics, so that it is possible to achieve excellent characteristics without using any active and passive components at the antenna end. Finally, the multimode monopole antenna of the present invention is made of FR4 epoxy. The design of the glass fiber substrate uses a ground plane to resonate with a low frequency mode, and the ground plane extension path is designed to increase the low frequency mode to adjust the impedance matching of the low frequency and ground resonance to conform to the wireless local area network IEEE 802.11 a/ b/g and WiMAX 2.5GHz, 5.25GHz required operating frequency band, with a simple structure, and easy to manufacture, can be effectively applied to USB dongle or other micro-no On the mobile device of the line communication.

(1) ‧‧‧ dielectric substrate

(11) ‧‧‧ first surface

(2) ‧‧‧ ground plane

(21) ‧‧‧First Extension

(22) ‧‧‧Second extension

(23) ‧‧ Third Extension

(24) ‧‧‧lateral convex

(25) ‧‧‧ slotted slot

(3)‧‧‧Feed in the endpoint

(4) ‧‧‧Metal Loop Radiation Department

(41) ‧ ‧ Fourth Extension

(42) ‧ ‧ Fifth Extension

(211)‧‧‧First straight segment

(212) ‧‧‧ first horizontal segment

(221) ‧‧‧Second straight segment

(222)‧‧‧Second horizontal section

(231) ‧‧‧ third horizontal segment

(232) ‧‧‧ third straight segment

(411) ‧‧‧4th straight segment

(412) ‧‧‧fourth horizontal segment

(413) ‧‧‧5th straight segment

(421) ‧‧‧ sixth straight segment

(422) ‧‧‧ fifth horizontal segment

(423) ‧‧‧ seventh straight segment

First: A schematic diagram of an antenna architecture of a preferred embodiment of a multi-modal monopole antenna of the present invention

Second Figure: Return loss/frequency response diagram of a preferred embodiment of the multimode monopole antenna of the present invention

Third: impedance/frequency response diagram of a preferred embodiment of the multimode monopole antenna of the present invention

Fourth: Return loss/frequency response diagram of shortening the ground plane length of a preferred embodiment of the multi-modal monopole antenna of the present invention

Figure 5 is a diagram showing the impedance/frequency response of the shortened ground plane length of a preferred embodiment of the multimode monopole antenna of the present invention.

Figure 6: Return loss/frequency response diagram of a fifth extension without a preferred embodiment of the multimode monopole antenna of the present invention

Figure 7 is a diagram showing the impedance/frequency response of a fifth extension of a preferred embodiment of the multimode monopole antenna of the present invention.

Figure 8: Return loss/frequency response diagram of a fourth extension without a preferred embodiment of the multimode monopole antenna of the present invention

Ninth view: impedance/frequency response diagram of a fourth extension portion of a preferred embodiment of the multimode monopole antenna of the present invention

Figure 10: The unconfigured first embodiment of the multimode monopole antenna of the present invention Return loss/frequency response diagram of three extensions and lateral projections

Figure 11: Impedance/frequency response diagram of a third extension portion and a lateral protrusion portion of a preferred embodiment of the multimode monopole antenna of the present invention

Twelfth Embodiment: Return loss/frequency response diagram of a first extension portion and a second extension portion of a preferred embodiment of the multimode monopole antenna of the present invention

Thirteenth embodiment: impedance/frequency response diagram of a first embodiment and a second extension portion of a multi-mode monopole antenna according to a preferred embodiment of the present invention

The object of the present invention and its structural design and advantages will be explained in the light of the preferred embodiments shown in the following drawings, so that the reviewing committee can have a more in-depth and specific understanding of the present invention.

First, referring to the first figure, a schematic diagram of an antenna structure of a multi-mode monopole antenna according to the present invention, wherein the multi-mode monopole antenna of the present invention occupies an area of 45×5 mm ^{2 .} The method further comprises: a dielectric substrate (1) having a first surface (11), wherein the dielectric substrate (1) is an FR4 epoxy glass fiber substrate, and the thickness of the FR4 epoxy glass fiber substrate is 1.6 mm. The dielectric constant is 4.4, and the loss tangent is 0.0245. A ground plane (2) is disposed on the first surface (11) for signal grounding, wherein the ground plane (2) is extended with a first An extension portion (21) is further provided with a second extension portion (22) at the first extension portion (21), and a third extension portion (23) is coupled to the longitudinal upper portion of the second extension portion (22). A lateral protrusion (24) is further disposed on the third extension portion (23), and the grounding surface (2) is recessed with a slot (25) on the other side of the corresponding first extension portion (21); In a preferred embodiment of the present invention, the ground plane (2) occupies an area of 35×5 mm ² ; a feed end point (3) is disposed on the first surface (11) and connected to the ground plane ( 2) Corresponding a slit groove (25); and a metal loop radiation portion (4) connected to the feed end point (3), wherein the metal loop radiation portion (4) is provided with a fourth extension portion (41), A fifth extension portion (42) extends from an end of the fourth extension portion (41) away from the first extension portion (21); in a preferred embodiment of the invention, the metal loop radiation portion (4) is It is formed on the first surface (11) by one of printing or etching, and the area of the metal loop radiating portion (4) is 10 × 5 mm ² .

The first extension portion (21) extends longitudinally from the ground plane (2) to a first straight segment (211), and then extends from the first straight segment (211) to the first lateral segment (212). )form.

The second extension portion (22) is terminated by a first lateral section (212) of the first extension portion (21), and a second straight section (221) extending in the direction of the ground plane (2) is connected. The second straight segment (221) terminal is formed by laterally extending the second lateral segment (222) to the first straight segment (211).

The third extension portion (23) is mainly connected to the first straight segment (211) on the second straight segment (221) of the second extension portion (22) and away from the ground plane (2). a third lateral section (231) extending, and a third straight section (232) extending longitudinally in the direction of the third lateral section (231) to the ground plane (2); the lateral protrusion (24) is The third straight segment (233) terminal protrudes away from the first straight segment (211).

Wherein, the fourth extending portion (41) extends from the ground plane (2) to the upper longitudinal direction by a fourth straight segment (411), and the fourth straight segment (411) terminates in the direction of the first straight segment (211). The transition laterally extends a fourth transverse section (412), and is then formed by the fourth transverse section (412) terminal extending longitudinally in the direction of the ground plane (2) by a fifth straight section (413).

The fifth extension portion (42) extends from the fourth straight segment (411) to the second straight segment (221) in a direction of the second straight segment (221), and is in a sixth straight segment (421). To the segment (421) terminal, the direction of the first straight segment (211) is laterally extended to a fifth lateral segment (422), and finally by the fifth lateral segment (422) for the longitudinal direction of the ground plane (2). Delay Extend a seventh straight section (422).

In addition, referring to the second and third figures, the return loss/frequency response diagram of the preferred embodiment of the multi-modal monopole antenna of the present invention, and the impedance/frequency response diagram are shown by the S-parameter diagram of the second figure. It can be seen from the actual measurement of the Z-parameter map of the third figure and the simulation result of the high-frequency electromagnetic simulation software (HFSS) of Ansoft that the multi-modal monopole antenna of the present invention conforms. WLAN 2.45 GHz, 5.2 GHz, 5.8 GHz, and WiMAX 2.5 GHz, 5.25 GHz band bandwidth requirements, and the results of the simulation and simulation results are quite close on the modal surface.

Furthermore, please refer to the fourth and fifth figures, which are diagrams showing the return loss/frequency response diagram of the shortened ground plane length and the impedance/frequency response diagram of a preferred embodiment of the multi-modal monopole antenna of the present invention. The "proposed structure" is the structure of a preferred embodiment of the present invention, and the other two are the structure in which the length of the ground plane (2) is reduced by 5 mm (mm) and 10 mm, and the fourth is As can be seen from the results in the five-two graph, the second mode of the return loss of the multi-modal monopole antenna of the present invention is required by the ground path resonance to reach the bandwidth.

In addition, please refer to the sixth and seventh figures, which are diagrams showing the return loss/frequency response diagram of the fifth extension portion and the impedance/frequency response diagram of a preferred embodiment of the multi-modal monopole antenna of the present invention. The "proposed architecture" is the architecture of a preferred embodiment of the present invention, and the other is the architecture without the fifth extension (42). The comparison result of the two figures shows that the metal loop radiating portion is not configured. (4) In the case of the fifth extension (42), it has an influence on the first mode of the low frequency, and the influence of the high frequency mode is used as a match; further, please refer to the eighth and ninth figures together. A return loss/frequency response diagram of the fourth extension (41) and an impedance/frequency response diagram of a preferred embodiment of the multi-modal monopole antenna of the present invention, as compared with the comparison of the two figures, no configuration In the case of the fourth extension (41) of the metal loop radiating portion (4), the effect on the overall modality is matched.

In addition, referring to the tenth and eleventh figures, the return loss/frequency response diagram of the third extension portion and the lateral protrusion portion, and the impedance are not configured in a preferred embodiment of the multi-modal monopole antenna of the present invention. / frequency response diagram, wherein the "proposed architecture" is the architecture of a preferred embodiment of the invention, and the other is the architecture of the third extension (23) and the lateral projection (24) without configuration. It can be seen that, without the third extension (23) and the lateral projection (24) of the ground plane (2), it can be found that the first mode of the low frequency is connected to the first mode of the high frequency. More high-frequency movement, so it can be determined that the path is the resonant low-frequency mode, and the high-frequency part is the high-order mode of this path; further, please refer to the twelfth and thirteenth pictures as shown in the figure. A preferred embodiment of the multimode monopole antenna is provided with a return loss/frequency response map of the first extension and the second extension, and an impedance/frequency response diagram, wherein the "proposed architecture" is the present invention The structure of a preferred embodiment, and the other is a frame without a first extension (21) and a second extension (22) According to the comparison between the two figures, in the case where the first extension portion (21) and the second extension portion (22) of the ground plane (2) are not disposed, the low frequency mode matching is affected, and the high frequency influence is affected. Larger.

It can be seen from the above description that the multimode monopole antenna of the present invention has the following advantages compared with the prior art:

1. The multi-modal monopole antenna of the present invention is designed to reduce the manufacturing cost and the difficulty of the manufacturing process by using a simple planar printed antenna design, and can be applied to various small-sized miniaturized mobile devices to achieve Good gain and radiation pattern characteristics.

2. The multi-modal monopole antenna of the present invention effectively meets the requirements of a miniaturized wireless mobile device by an overall antenna area of only 45 x 5 mm ² , and the multi-modal monopole antenna of the present invention has a path of passive component characteristics. Therefore, it is not necessary to use any active and passive components at the antenna end to achieve excellent performance.

3. The multi-modal monopole antenna of the present invention is designed by the FR4 epoxy glass fiber substrate, and uses a ground plane to resonate to a low frequency mode, and the ground plane extends the path. Designed to increase the low frequency mode to adjust the impedance matching of low frequency and ground resonance to meet the required frequency band of wireless local area network IEEE 802.11 a/b/g and WiMAX 2.5GHz, 5.25GHz, with simple architecture and easy fabrication The advantage can be effectively applied to USB dongle or other mobile devices of micro wireless communication.

In summary, the multi-modal monopole antenna of the present invention can achieve the intended use efficiency by the above-disclosed embodiments, and the present invention has not been disclosed before the application, and has completely complied with the provisions of the Patent Law. With requirements.爰Issuing an application for a patent for invention in accordance with the law, and asking for a review, and granting a patent, is truly sensible.

The illustrations and descriptions of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; those skilled in the art, which are characterized by the scope of the present invention, Equivalent variations or modifications are considered to be within the scope of the design of the invention.

(1) ‧‧‧ dielectric substrate

(11) ‧‧‧ first surface

(2) ‧‧‧ ground plane

(21) ‧‧‧First Extension

(22) ‧‧‧Second extension

(23) ‧‧ Third Extension

(24) ‧‧‧lateral convex

(25) ‧‧‧ slotted slot

(3)‧‧‧Feed in the endpoint

(4) ‧‧‧Metal Loop Radiation Department

(41) ‧ ‧ Fourth Extension

(42) ‧ ‧ Fifth Extension

Claims (10)

A multi-modal monopole antenna includes at least: a dielectric substrate having a first surface; a grounding surface disposed on the first surface for signal grounding, wherein the grounding surface is upward Longitudinally extending a first straight segment and extending a first extending portion of the first lateral segment laterally at the first straight segment end, and connecting to the first lateral segment of the first extending portion a second straight section extending in the direction of the ground plane, a second extension connecting the second straight section end to the second lateral section extending laterally to the first straight section, and a second extension at the second extension a third straight section extending in the direction of the first straight section and a third straight section extending longitudinally extending in the direction of the grounding plane are connected to the end of the straight section and away from the ground plane a third extending portion of the third extending portion of the third extending portion is further laterally connected to a lateral convex portion protrudingly connected away from the first straight portion, and the side of the grounding surface is especially Referring to the other side of the side on which the first extension is provided a slot having an opening facing outward; a feed end disposed on the first surface and coupled to the ground surface, disposed opposite the first extension and located above the slot; a metal loop radiation portion is connected to the feed end point, wherein the metal loop radiation portion includes a fourth extension portion and a fifth extension portion, the fourth extension portion is attached to Extending a fourth straight section in the longitudinal direction, extending a fourth lateral section in the direction of the first straight section toward the first straight section, and then extending from the fourth lateral section to the ground plane Extending a fifth straight segment, the fifth extending portion extends from the fourth straight segment end to the second straight segment to a sixth straight segment, and the sixth straight segment end faces the first segment The fifth transverse section extends laterally in the direction of the segment, and finally forms a seventh straight section extending longitudinally from the terminal of the fifth transverse segment toward the ground plane. The multi-modal monopole antenna according to claim 1, wherein the multi-modal monopole antenna occupies an area of 45 × 5 mm ² . The multi-modal monopole antenna of claim 1, wherein the dielectric substrate is an FR4 epoxy glass fiber substrate. The multi-modal monopole antenna according to claim 3, wherein the FR4 epoxy glass fiber substrate has a thickness of 1.6 mm, a dielectric constant of 4.4, and a loss tangent of 0.0245. The multi-modal monopole antenna according to claim 1, wherein the ground plane has a size of 35 × 5 mm ² . The multi-modal monopole antenna of claim 1, wherein the metal loop radiation portion is formed on the first surface in one of printing or etching. The multi-modal monopole antenna according to claim 1, wherein the metal loop radiating portion occupies an area of 10 × 5 mm ² . The multi-modal monopole antenna according to any one of claims 1 to 7, wherein the second straight segment, the fourth straight segment, and the sixth straight segment are the first straight direction The segment, the third straight segment, the fifth straight segment, and the seventh straight segment are parallel to each other. The multi-modal monopole antenna of claim 8, wherein the first lateral segment, the second lateral segment, the third lateral segment, the fourth lateral segment, and the fifth lateral segment are parallel to each other. The multi-modal monopole antenna according to any one of claims 1 to 7, wherein the first lateral segment, the second lateral segment, the third lateral segment, the fourth lateral segment, and the first The five lateral segments are parallel to each other.