TW201832411A - Antenna structure - Google Patents

Abstract

An antenna structure includes a signal source, a first radiation element, a layout, and a second radiation element. The first radiation element includes a ceramic antenna element and at least one passive element. The first radiation element is coupled through the layout to the signal source. The second radiation element is coupled to the layout. The first radiation element is excited to generate a first frequency band. The second radiation element is excited to generate a second frequency band.

Description

 Antenna structure  

The present invention relates to an antenna structure, and more particularly to a multiband antenna structure.

With the development of mobile communication technologies, mobile devices have become more and more popular in recent years, such as portable computers, mobile phones, multimedia players, and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-range wireless communication range, for example, mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz bands used for communication, and Some cover short-range wireless communication ranges, such as Wi-Fi, Bluetooth systems using 2.4GHz, 5.2GHz and 5.8GHz bands for communication.

The antenna is an indispensable component in mobile devices that support wireless communication. However, due to the limited internal space of the mobile device, there is often not enough area to configure the required antenna elements. Therefore, how to design a new antenna with a small size and a wide frequency band has become a major challenge for today's designers.

In a preferred embodiment, the present invention provides an antenna structure including: a signal source; a first radiating portion including a ceramic antenna element and at least one passive component; a circuit layout, wherein the first radiating portion is a circuit arrangement coupled to the signal source; and a second radiating portion coupled to the circuit layout; wherein the first radiating portion is excited to generate a first frequency band, and the second radiating portion is excited to generate a second frequency band .

In some embodiments, the first frequency band is a GPS (Global Positioning System) band located at 1575 MHz, and the second frequency band is a WLAN (Wireless Local Area Network) 2.4 GHz band between 2400 MHz and 2484 MHz.

In some embodiments, the antenna structure further includes: a feed matching circuit embedded in the circuit layout, wherein the signal source is coupled to the first radiating portion via the feed matching circuit and the circuit layout, respectively And the second radiating portion.

In some embodiments, the passive component includes one or more capacitors or (and) one or more inductors.

In some embodiments, the second radiating portion is substantially a C-shaped metal portion or an L-shaped metal portion.

In some embodiments, the antenna structure further includes: a system circuit board including a ground plane area and a non-metal area, wherein the ground plane area at least partially surrounds the non-metal area, and the first radiating portion and The second radiating portion is disposed on the non-metallic region.

In some embodiments, the non-metallic region is located intermediate one of the edges of the system board.

In some embodiments, the ceramic antenna element is of a loop type, and the circuit layout is coupled to the ceramic antenna element, the passive element, the second radiating portion, and the ground plane region.

In some embodiments, the non-metallic region is located at a corner of the system board.

In some embodiments, the ceramic antenna element is monopolar, and the circuit layout is coupled to the ceramic antenna element, the passive element, and the second radiating portion.

100, 300‧‧‧ antenna structure

110, 310‧‧‧ Signal source

120, 320‧‧‧ First Radiation Department

130, 330‧‧‧Ceramic antenna elements

142, 144, 342‧‧‧ Passive components

150, 350‧‧‧ circuit layout

160, 360‧‧‧Second Radiation Department

161, 361‧‧‧ the first end of the second radiation department

162, 362‧‧‧ second end of the second radiation department

170, 370‧‧‧ feed matching circuit

180, 380‧‧‧ system board

182, 382‧‧‧ ground plane area

184, 384‧‧‧ non-metallic areas

FB1‧‧‧ first frequency band

FB2‧‧‧second frequency band

1 is a schematic view showing an antenna structure according to an embodiment of the present invention; FIG. 2 is a diagram showing a return loss of an antenna structure according to an embodiment of the present invention; and FIG. 3 is a view showing another according to the present invention. A schematic diagram of an antenna structure as described in an embodiment.

In order to make the objects, features and advantages of the present invention more comprehensible, the specific embodiments of the invention are set forth in the accompanying drawings.

Certain terms are used throughout the description and claims to refer to particular elements. Those skilled in the art will appreciate that a hardware manufacturer may refer to the same component by a different noun. The scope of the present specification and the patent application do not use the difference in the name as the means for distinguishing the elements, but the difference in function of the elements as the criterion for distinguishing. The words "including" and "including" as used throughout the specification and the scope of the patent application are open-ended terms and should be interpreted as "including but not limited to". The term "substantially" means that within the acceptable error range, those skilled in the art will be able to solve the technical problems within a certain error range to achieve the basic technical effects. In addition, the term "coupled" is used in this specification to include any direct and indirect electrical connection means. Therefore, if a first device is coupled to a second device, the first device can be directly electrically connected to the second device, or indirectly connected to the second device via other devices or connection means. Two devices.

1 is a schematic diagram showing an antenna structure 100 in accordance with an embodiment of the present invention. The antenna structure 100 can be applied to a mobile device, such as a smart phone, a tablet computer, or a notebook computer. In the embodiment of FIG. 1 , the antenna structure 100 includes at least a signal source 110 , a first radiating portion 120 , a circuit layout 150 , and a second radiating portion 160 . The signal source 110 can be a radio frequency (RF) module for exciting the antenna structure 100. Signal source 110 can be considered as one of the inputs or an output of antenna structure 100. The first radiating portion 120 includes a ceramic antenna element 130, a first passive component 142, and a second passive component 144. The first passive component 142 and the second passive component 144 are used to fine tune the impedance of the ceramic antenna component 130. In some embodiments, each of the first passive component 142 and the second passive component 144 includes one or more capacitors or (and) one or more inductors (Inductors), such as: wafer capacitors or ( And) the chip inductor. The circuit layout 150 can be a transmission line or a conductor connection having an impedance value of about 50 ohms. The ceramic antenna element 130, the first passive component 142, and the second passive component 144 of the first radiating portion 120 can be coupled to the signal source 110 via the circuit layout 150. The second radiating portion 160 may be a C-shaped metal portion. The second radiating portion 160 has a first end 161 and a second end 162. The first end 161 of the second radiating portion 160 is coupled to the circuit layout 150, and the second end 162 of the second radiating portion 160 is a Open End.

In some embodiments, the antenna structure 100 further includes a feeding matching circuit (Feeding Matching Circuit) 170. The feed matching circuit 170 can be embedded in the circuit layout 150, wherein the signal source 110 is coupled to the first radiating portion 120 and the second radiating portion 160 via the feed matching circuit 170 and the circuit layout 150, respectively. The feed matching circuit 170 may also include one or a plurality of capacitors or (and) one or more inductors, so that Impedance Matching of the first radiating portion 120 and the second radiating portion 160 may be simultaneously adjusted.

In some embodiments, the antenna structure 100 further includes a system circuit board 180. The system board 180 includes a Ground Plane Region 182 and a Non-metal Region 184, wherein the ground plane region 182 at least partially surrounds the non-metallic region 184. For example, the non-metallic region 184 can assume a rectangular shape and can be located intermediate the short edge of one of the system circuit boards 180. Both the first radiating portion 120 and the second radiating portion 160 may be disposed on the non-metallic region 184, wherein the second radiating portion 160 is formed in a printed manner and printed directly on the non-metallic region 184.

As shown in Fig. 1, the ceramic antenna element 130 of the first radiating portion 120 is of a loop type. In a loop-type design, circuit layout 150 is coupled to ceramic antenna element 130, first passive component 142, second passive component 144, second radiating portion 160, and ground plane region 182. In addition, one of the circuit layout 150, the first passive component 142, and the ceramic antenna component 130 can form a closed loop structure to increase the low frequency bandwidth of the antenna structure 100.

2 is a diagram showing a Return Loss diagram of an antenna structure 100 in accordance with an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). According to the measurement result of FIG. 2, the antenna structure 100 can cover a first frequency band FB1 and a second frequency band FB2, wherein the first radiation portion 120 can excite the first frequency band FB1, and the second radiation portion 160 can be excited to generate The aforementioned second frequency band FB2. In detail, the first frequency band FB1 may be a GPS (Global Positioning System) band located at 1575 MHz, and the second frequency band FB2 may be a WLAN (Wireless Local Area Network) 2.4 GHz band between 2400 MHz and 2484 MHz. . Therefore, the antenna structure 100 will simultaneously support multi-frequency bandwidth operation of GPS and WLAN 2.4 GHz.

In terms of the antenna principle and component size of the embodiments of Figures 1 and 2, the total length of the second radiating portion 160 may be substantially equal to 0.25 times the wavelength (λ/4) of the second frequency band FB2. Additionally, the first passive component 142 and the second passive component 144 may resonate with the ceramic antenna component 130 such that the equivalent resonant length of the first radiating portion 120 may be substantially equal to 0.5 times the wavelength (λ/2) of the first frequency band FB1. If the component size of the antenna structure 100 is appropriately adjusted, it may cover other frequency bands, for example, the LTE (Long Term Evolution) band.

Figure 3 is a schematic diagram showing an antenna structure 300 in accordance with another embodiment of the present invention. Figure 3 is similar to Figure 1. In the embodiment of FIG. 3, the antenna structure 300 includes at least a signal source 310, a first radiating portion 320, a circuit layout 350, and a second radiating portion 360. The first radiating portion 320 includes a ceramic antenna element 330 and a passive element 342. Passive component 342 can include one or more capacitors or (and) one or more inductors. Circuit layout 350 can be a transmission line or a conductor connection. Both the ceramic antenna element 330 and the passive element 342 of the first radiating portion 320 can be coupled to the signal source 310 via the circuit layout 350. The second radiating portion 360 may be an L-shaped metal portion. The second radiating portion 360 has a first end 361 and a second end 362, wherein the first end 361 of the second radiating portion 360 is coupled to the circuit layout 350, and the second end 362 of the second radiating portion 360 is a Open the road.

In some embodiments, antenna structure 300 further includes a feed matching circuit 370. The feed matching circuit 370 can be embedded in the circuit layout 350, wherein the signal source 310 is coupled to the first radiating portion 320 and the second radiating portion 360 via the feed matching circuit 370 and the circuit layout 350, respectively. Feed matching circuit 370 can also include one or more capacitors or (and) one or more inductors.

In some embodiments, antenna structure 300 further includes a system circuit board 380. The system board 380 includes a ground plane region 382 and a non-metal region 384, wherein the ground plane region 382 at least partially surrounds the non-metal region 384. For example, the non-metallic region 384 can assume a rectangle and can be located at a corner of the system board 380. Both the first radiating portion 320 and the second radiating portion 360 may be disposed on the non-metallic region 384.

As shown in FIG. 3, the ceramic antenna element 330 of the first radiating portion 320 is of a monopole type. In a unipolar design, the circuit layout 350 is coupled to the ceramic antenna element 330, the passive element 342, and the second radiating portion 360 (but the circuit layout 350 is not connected to the ground plane region 382, which is similar to the loop type Different design). In addition, one of the circuit layout 350, the passive component 342, and the ceramic antenna component 330 can form a straight strip structure to increase the low frequency bandwidth of the antenna structure 300.

Similarly, the antenna structure 300 may also cover the first frequency band FB1 and the second frequency band FB2 (ie, the GPS band and the WLAN 2.4 GHz band) according to actual measurement results. In terms of the antenna principle and component size of the embodiment of Fig. 3, the length of the second radiating portion 360 may be substantially equal to 0.25 times the wavelength (λ/4) of the second frequency band FB2. Additionally, the passive component 342 can resonate with the ceramic antenna component 330 such that the equivalent resonant length of the first radiating portion 320 can be substantially equal to 0.25 times the wavelength (λ/4) of the first frequency band FB1. If the component size of the antenna structure 300 is appropriately adjusted, it may cover other frequency bands, for example, the LTE (Long Term Evolution) band. The remaining features of the antenna structure 300 of FIG. 3 are similar to those of the antenna structure 100 of FIG. 1, so that the second embodiment can achieve similar operational effects.

Briefly stated, the present invention provides a novel antenna structure that has at least the following advantages: (1) miniaturized design; (2) can cover both GPS and WLAN bands; (3) has a larger bandwidth; (4) Easy to mass produce; and (5) lower manufacturing costs. Therefore, the present invention is well suited for use in various miniaturized mobile communication devices.

It is to be noted that the above-described component sizes, component shapes, and frequency ranges are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. The antenna structure of the present invention is not limited to the state illustrated in Figures 1-3. The present invention may include only any one or more of the features of any one or a plurality of embodiments of Figures 1-3. In other words, not all illustrated features must be simultaneously implemented in the antenna structure of the present invention.

The ordinal numbers in this specification and the scope of the patent application, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to indicate that two are identical. Different components of the name.

The present invention has been described above with reference to the preferred embodiments thereof, and is not intended to limit the scope of the present invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

Claims (10)

 An antenna structure comprising: a signal source; a first radiating portion comprising a ceramic antenna element and at least one passive component; a circuit arrangement, wherein the first radiating portion is coupled to the signal source via the circuit layout; a second radiating portion is coupled to the circuit layout; wherein the first radiating portion is excited to generate a first frequency band, and the second radiating portion is excited to generate a second frequency band.    The antenna structure according to claim 1, wherein the first frequency band is a GPS (Global Positioning System) band located at 1575 MHz, and the second frequency band is a WLAN between 2400 MHz and 2484 MHz (Wireless Local) Area Network) 2.4 GHz band.    The antenna structure of claim 1, further comprising: a feed matching circuit embedded in the circuit layout, wherein the signal source is coupled to the circuit through the feed matching circuit and the circuit layout, respectively a first radiating portion and the second radiating portion.    The antenna structure of claim 1, wherein the passive component comprises one or more capacitors or (and) one or more inductors.    The antenna structure of claim 1, wherein the second radiating portion is substantially a C-shaped metal portion or an L-shaped metal portion.    The antenna structure of claim 1, further comprising: a system circuit board comprising a ground plane area and a non-metal area, wherein the ground plane area at least partially surrounds the non-metal area, and the A radiation portion and the second radiation portion are disposed on the non-metal region.    The antenna structure of claim 6, wherein the non-metallic region is located at an edge of one of the edges of the system board.    The antenna structure of claim 7, wherein the ceramic antenna element is a loop type, and the circuit layout is coupled to the ceramic antenna element, the passive component, the second radiating portion, and the ground plane region.    The antenna structure of claim 6, wherein the non-metallic region is located at a corner of the circuit board of the system.    The antenna structure of claim 9, wherein the ceramic antenna element is monopolar, and the circuit layout is coupled to the ceramic antenna element, the passive element, and the second radiating portion.