TW201315019A - Coupling feed-in loop antenna - Google Patents

Abstract

The invention relates to a coupling feed-in loop antenna. Primarily, it comprises a dielectric substrate, a ground plane, a radiation division of a metal loop, at least one chip inductor, a microstrip-fed transmission line and a planar metal plate. A broadband effect can be achieved by a single resonant path of the radiation division of the metal loop. Then the resonance mode of 1 λ and 1.5 λ for the single resonant path can be adjusted by the chip inductor, combining the effect of reducing frequency for planar metal plate, the resonance of 0.5 λ , 1 λ and 1.5 λ for the single resonant path can be formed as broadband at a low frequency band. Accordingly, such antenna can be operated under the frequency bands of LTE 700, GSM 850/900, PCS, DCS, UMTS, LTE 2300 and LTE 2500 without any addition of antenna volume.

Description

Coupled feed loop antenna

The present invention relates to a coupled feed-through loop antenna, and more particularly to a frequency band suitable for LTE 700 (698-787 MHz), GSM850 ∕ 900 (824-960 MHz), PCS (1880~) without increasing the antenna size. 1990MHz), DCS (1710 ~ 1880MHz), UMTS (1920 ~ 2170MHz), LTE2300 (2305 ~ 2400MHz) and LTE 2500 (2500 ~ 2690MHz), and the process is simple, coupled with the manufacturing cost advantage of the feed-in loop antenna.

According to the rapid development of communication technology and the increasing popularity of electronic products, wireless signal transmission has developed a variety of communication protocols and technologies, and the demand for wireless communication is increasing day by day, and all the handheld electronic products are used. (For example, mobile phones, PDAs, etc.) can send and receive signals in different frequency bands to have more powerful communication functions.

In general, dual- or tri-band antennas are usually installed in handheld electronic products to transmit and receive signals in different frequency bands. The form of antennas is ever-changing and can be roughly classified into four categories: (a) wire antennas (wire) Antennas): common monopoles, dipoles, and loops; (b) aperture antennas: horn antennas and slotted antennas (slots) (c) printed circuit antennas: for example, micro-strips and printed dipoles; and (d) reflector antennas; Today, the communication frequency bands used in handheld electronic products are commonly low-frequency LTE700MHz, GSM850∕900MHz, High-frequency DCS1800MHz, PCS1900MHz, and LTE2300∕2500MHz, etc.; however, the above-mentioned conventional antennas can only transmit and receive signals in two or three frequency bands, and cannot cover other common frequency bands, for example, U.S. Patent No. 6,727,854 A "planar inverted-F antenna" that operates only in the frequency band covering GSM850 ∕ 900 MHz.

Furthermore, please refer to "a dual-frequency inverted-F antenna" disclosed in the Republic of China Invention Patent Publication No. I254493, which uses a dual resonance path to adjust the bandwidth, impedance matching and gain of the antenna to achieve dual or multiple frequency. Operation; however, the frequency band used today is lower than the conventional one. Increasing the frequency band of the antenna in this way not only leads to an increase in the size of the antenna, but also fails to meet the demand for the current thinness and shortness of the handheld electronic product, and the method of using multiple path resonance also makes The antenna structure is relatively complicated, resulting in cumbersome process and high manufacturing cost.

Nowadays, the inventor is still in the light of the insatiable spirit of the existing antennas in the actual implementation, and is improved by the rich professional knowledge and years of practical experience. Based on this, the present invention has been developed.

The main object of the present invention is to provide a frequency band suitable for LTE 700 (698 to 787 MHz), GSM850 ∕ 900 (824 to 960 MHz), PCS (1880 to 1990 MHz), DCS (1710 to 1880 MHz), UMTS without increasing the antenna size. (1920 ~ 2170MHz), LTE2300 (2305 ~ 2400MHz) and LTE2500 (2500 ~ 2690MHz), and the process is simple, coupled with the manufacturing cost advantage of the feed-in loop antenna.

In order to achieve the above-mentioned implementation, the inventors have developed the following implementation techniques, which mainly include a dielectric substrate, a ground plane, a metal loop radiation portion, at least one chip inductor, a feed microstrip transmission line, and a planar metal sheet; The dielectric substrate has a first surface and a second surface corresponding thereto, and the ground surface is disposed on the first surface for signal grounding, and the metal loop radiation portion is formed on the first by printing or etching. The surface is connected to one side edge of the ground plane, wherein the metal loop radiation portion has a plurality of bends; then, the two wafer inductors are respectively disposed at the bend of the metal loop radiation portion, and are fed into the microstrip transmission line The corresponding metal loop radiation portion is laid flat on the second surface, one end of which is the signal feeding end of the antenna, and the other end is a coupling end; wherein the coupling end is composed of a rectangular main body portion and five rectangles connected with the rectangular main body portion The extension portion is formed; and the rectangular extension portion is respectively a first extension portion located at the upper right end of the rectangular body portion, located below the first extension portion and connected thereto a second extension portion, a third extension portion located below the second extension portion, a fourth extension portion relative to the first extension portion, and a fifth extension portion located below and connected to the fourth extension portion; finally, a planar metal piece Soldering on the dielectric substrate and the ground plane, and being orthogonal to it.

Thereby, the broadband resonant effect can be formed through a single resonant path of the metal loop radiating portion, so that it can operate under the LTE700, GSM850∕900, PCS, DCS, UMTS, LTE2300, and LTE2500 bands without increasing the antenna volume. The process is simple and has the advantage of manufacturing cost; in addition, the chip inductance at the bend of the two sides of the metal loop radiation portion can be used to adjust the 1λ and 1.5λ resonance modes of the single path of the metal loop radiation portion. Therefore, 0.5λ, 1λ, and 1.5λ can be formed by a single path to form a wide frequency band in a low frequency band, which is different from the traditional use of a chip inductor as a fundamental frequency mode for frequency reduction; in addition, a planar metal piece can also be provided. The efficiency of down-conversion and impedance matching allows the antenna to have the best impedance operating bandwidth in the low frequency range.

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 to fifth figures, a preferred embodiment of the coupled feed-through loop antenna of the present invention mainly includes:

a dielectric substrate (1) having a first surface (11) and a second surface (12) corresponding to the first surface (11); wherein the dielectric substrate (1) is an FR4 epoxy fiberglass board;

a ground plane (2) is disposed on the first surface (11) for signal grounding;

a metal loop radiation portion (3) is formed on the first surface (11) by printing or etching and connected to one side edge of the ground plane (2), and the metal loop radiation portion (3) has a plurality of Bend

At least one chip inductor (4) is disposed at a bend of the metal loop radiating portion (3). In this embodiment, two chip inductors (4) are placed on the metal loop radiating portion (3). Bending place;

a feeding microstrip transmission line (5) corresponding to the metal loop radiation portion (3) and lying on the second surface (12), one end of which is the signal feeding end (51) of the antenna, and the other end is a coupling end (52), the coupling end (52) is composed of a rectangular body portion (6) and five rectangular extensions (7) connected to the rectangular body portion (6); and the rectangular extensions (7) are respectively located a first extension portion (71) at the upper right end of the rectangular body portion (6), a second extension portion (72) located below the first extension portion (71) and connected thereto, and a third portion located below the second extension portion (72) An extension (73), a fourth extension (74) relative to the first extension (71), and a fifth extension (75) located below and coupled to the fourth extension (74);

a planar metal piece (8) soldered to the dielectric substrate (1) and the ground plane (2) such that the planar metal piece (8) simultaneously exhibits an orthogonal state with the dielectric substrate (1) and the ground plane (2); In this embodiment, the horizontal and longitudinal lengths of the planar metal sheets (8) are 50 mm and 5 mm, respectively.

In addition, referring to the first to third figures, the metal loop radiation portion (3) in the embodiment has a connecting portion (31) adjacent to the planar metal sheet (8), and the connecting portion (31) The first and second radiating sections (33) are connected to the first and second radiating sections (33) by a first bending section (32). (34) The distance between the systems is 2 mm, and the chip inductors (4) having an inductance value of 15 nH are respectively placed in the first bending section (32); further, the first and second radiation sections (33), (34) The distance between the first and second radiant sections (33) and (34) after the second bending section (35) is 2 mm, and the distance between the first and second radiant sections (33) and the third bending section (35) is 1mm; it is worth noting that the metal loop radiating portion (3) on the side of the fourth extension portion (74) has a feeding pitch of 2 mm at the junction with the ground plane (2) (please refer to the fifth diagram together) Shown).

Referring to FIG. 6 , it is a return loss ∕ frequency response diagram of a preferred embodiment of the present invention; in this embodiment, a connector for grounding the ground plane ( 2 ) and the dielectric substrate ( 1 ) is further disposed ( 9), and connected to the signal feeding end (51) of the microstrip transmission line (5) for signal feeding; please refer to the first figure, wherein the connector (9) can be a 50 ohm SMA connector (9); and the lateral and longitudinal lengths of the ground plane (2) are 50 mm and 100 mm, respectively, and the lateral and longitudinal lengths of the metal loop radiating portion (3) are 50 mm and 14 mm, respectively, and the metal loop radiating portion (3) The total length of the path is 262mm, so that the path can generate half-wavelength resonance of about 570MHz. In addition, please refer to the fifth figure, the horizontal and vertical lengths of the rectangular main body part (6) are 4mm and 10.5mm respectively. The length of the first extending portion (71) is 1-4 mm and 3 mm, respectively, and the length of the second extending portion (72) is 3. ～10.5 mm and 3 mm, the lateral and longitudinal lengths of the third extension (73) are respectively 0.1 to 5 mm and 2 mm, and the lateral and longitudinal lengths of the fourth extension (74) are respectively 2.5 to 9.5 mm. And 2mm, the longitudinal and longitudinal lengths of the fifth extension (75) are 2.5-7mm and 0.5mm respectively; the actual measurement in the figure and the high frequency electromagnetic simulation software (HFSS, Highsoft Structure Simulator) using Ansoft The results obtained by the analog analysis show that the low-band bandwidth is about 338MHz (693~1031MHz) and the impedance bandwidth is about LTE700 (698~787MHz) and GSM850. ∕900 (824-960MHz) system, while the high-band part is covered by high-order modes of low-band 0.5, 1 and 1.5-wavelength resonant modes, and its high frequency band is operable DCS (1 The 10 ~ 1880MHz), PCS (1880 ~ 1990MHz), UMTS (1920 ~ 2170MHz), LTE2300 (2305 ~ 2400MHz), and LTE2500 (2500 ~ 2690MHz) system, the impedance bandwidth of approximately 1113MHz (1668 ~ 2781MHz).

Please refer to the seventh to eighth figures, which are radiation field diagrams of 740 MHz and 925 MHz respectively according to a preferred embodiment of the present invention. It can be seen from the graphical display that the x-y plane has omnidirectional radiation (Omni-directional). Radiation), the radiation field characteristics of the y-z plane and the x-z plane also have a good performance; please refer to the ninth to eleventh figures, which are respectively at 1785MHz, 2025MHz and The 2400MHz radiation field pattern can be seen from the graphical display results. The x-y plane also has good radiation performance, and the radiation field type has similar characteristics, which makes the antenna have stable characteristics in communication transmission.

From the above-described coupled feed-through loop antenna and the implementation description, the present invention has the following advantages:

1. The invention realizes the effect of wide frequency by a single resonance path of the metal loop radiation portion, and the invention can achieve the method of multi-channel or multi-frequency by the method of using the multi-path resonance to achieve the dual-frequency or multi-frequency method. At the same time, it operates in the LTE700, GSM850∕900, PCS, DCS, UMTS, LTE2300 and LTE2500 frequency bands, and the process is simple and has the advantage of manufacturing cost.
2. The invention adopts a 1λ and 1.5λ resonance mode which is reinforced by a single path of the metal loop radiating portion of the chip inductor, so that 0.5λ, 1λ and 1.5λ can be formed in a low frequency band by resonance of a single path. Broadband is different from the traditional use of chip inductors as the fundamental frequency mode of the frequency reduction.
3. The invention utilizes the planar metal piece to achieve the functions of frequency reduction and impedance matching, so that the antenna has the best impedance operation bandwidth in the low frequency band.

In summary, the coupled feed-in loop 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 patent law. Regulations and 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

(12). . . Second surface

(2). . . Ground plane

(3). . . Metal loop radiation

(31). . . Connection segment

(32). . . First bend

(33). . . First radiant section

(34). . . Second radiant section

(35). . . Second bend

(4). . . Chip inductance

(5). . . Feed into the microstrip transmission line

(51). . . Signal feed

(52). . . Coupling end

(6). . . Rectangular body

(7). . . Rectangular extension

(71). . . First extension

(72). . . Second extension

(73). . . Third extension

(74). . . Fourth extension

(75). . . Fifth extension

(8). . . Plane metal sheet

(9). . . Connector

First Figure: Appearance perspective view of an embodiment of the present invention

Second Figure: Appearance side view of an embodiment of the present invention

Third: a plan view of a first surface of a dielectric substrate according to an embodiment of the present invention

Fourth: plan view of the second surface of the dielectric substrate of the embodiment of the present invention

Figure 5: Partial enlarged plan view of the coupling end of the embodiment of the present invention

Figure 6: Return loss ∕ frequency response diagram of an embodiment of the present invention

Figure 7: Radiation pattern at 740 MHz of an embodiment of the present invention

Figure 8: Radiation pattern diagram of the embodiment of the present invention at 925 MHz

Ninth diagram: radiation pattern diagram of the embodiment of the present invention at 1785 MHz

Figure 11: Radiation pattern diagram of the embodiment of the present invention at 2025 MHz

Eleventh figure: radiation pattern diagram of the embodiment of the present invention at 2400 MHz

(1). . . Dielectric substrate

(11). . . First surface

(12). . . Second surface

(3). . . Metal loop radiation

(31). . . Connection segment

(32). . . First bend

(33). . . First radiant section

(34). . . Second radiant section

(35). . . Second bend

(4). . . Chip inductance

(5). . . Feed into the microstrip transmission line

(51). . . Signal feed

(52). . . Coupling end

(6). . . Rectangular body

(8). . . Plane metal sheet

(9). . . Connector

Claims (10)

A coupled feed-in loop antenna includes:
a dielectric substrate having a first surface and a pair of second surfaces that should be the first surface;
a grounding surface is disposed on the first surface for use as a signal grounding;
a metal loop radiation portion is disposed on the first surface and connected to one side edge of the ground plane, and the metal loop radiation portion has a plurality of bends;
At least one chip inductor is disposed at a bend of the metal loop radiation portion;
a feeding microstrip transmission line corresponding to the metal loop radiation portion and lying on the second surface, one end of which is a signal feeding end of the antenna, and the other end is a coupling end, the coupling end is a rectangular body part And a rectangular extension portion connected to the rectangular body portion, wherein the rectangular extension portion is a first extension portion located at an upper right end of the rectangular body portion, and a second extension below the first extension portion and connected thereto a third extension portion located below the second extension portion, a fourth extension portion opposite to the first extension portion, and a fifth extension portion located below and connected to the fourth extension portion; and a planar metal piece And is orthogonal to and connected to the dielectric substrate and the ground plane. The coupled feed-in loop antenna according to claim 1, wherein a joint of the ground plane and the dielectric substrate is further disposed, and the joint is connected to the signal feeding end of the feeding microstrip transmission line. For signal feed, and the connector is a 50 ohm SMA connector. The coupled feed-in loop antenna of claim 1, wherein the dielectric substrate is an FR4 epoxy fiberglass board. The coupled feed-in loop antenna of claim 1, wherein the metal loop radiating portion is formed on the first surface by printing or etching. The coupled feed-in loop antenna according to claim 1, wherein the metal loop radiating portion has a connecting portion adjacent to the planar metal piece, and the connecting portion has a first bending portion at each end The first radiant section and the second radiant section are connected, and the distance between the connecting section and the first and second radiating sections is 2 mm, and the first bending section is used for respectively placing the chip inductor, and the inductance value thereof It is 15nH. The coupled feed-in loop antenna according to claim 5, wherein the first and second radiating segments are formed in a distance of 2 mm between the front and the back of the second bent portion, and the first and second radiating segments are The bending distance formed after the second bending section is 1 mm. The coupled feed-in loop antenna according to claim 1, wherein the metal loop radiating portion on the side of the fourth extending portion has a feeding pitch of 2 mm at a joint with the ground plane. The coupled feed-in loop antenna according to claim 1, wherein the lateral and longitudinal lengths of the ground plane are 50 mm and 100 mm, respectively, and the lateral and longitudinal lengths of the metal loop radiating portion are 50 mm and 14 mm, respectively. And the total length of the path of the metal loop radiation portion is 262 mm. The coupled feed-in loop antenna of claim 1, wherein the planar metal sheet has a lateral and longitudinal length of 50 mm and 5 mm, respectively. The coupled feed-in loop antenna according to claim 1, wherein the rectangular body portion has a lateral and longitudinal length of 4 mm and 10.5 mm, respectively, and the first and second longitudinal portions have a length of 1 and a length, respectively. ～4 mm and 3 mm, the lateral and longitudinal lengths of the second extension are respectively 3.5 to 10.5 mm and 3 mm, and the lateral and longitudinal lengths of the third extension are 0.1 to 5 mm and 2 mm, respectively. The lateral and longitudinal lengths of the extension are 2.5 to 9.5 mm and 2 mm, respectively, and the lateral and longitudinal lengths of the fifth extension are 2.5 to 7 mm and 0.5 mm, respectively.