CN103078174A - Multi-frequency antenna device - Google Patents

Abstract

The present invention discloses a multi-frequency antenna device. The multi-frequency antenna device comprises: a first antenna and a second antenna; the first antenna comprises a feeding portion and a first grounding portion; the second antenna is integrated with the first antenna and comprises the feeding portion and a second grounding portion; wherein the feeding portion is arranged between the first grounding portion and the second grounding portion, and the first antenna and the second antenna share the feeding portion when transmitting and receiving signals. The present invention combines two antennas using a feeding point and two grounding portions to achieve a larger bandwidth and good antenna efficiency.

Description

multi-frequency antenna device

technical field

The present invention relates to an antenna device, and in particular to a multi-frequency antenna device.

Background technique

In modern information life, the convenience of life can be increased by wireless communication equipment that does not need optical fiber or cable to transmit signals and obtain information in real time. With the evolution of technology, various portable wireless communication devices, such as smart phones, notebook computers, tablet computers, etc., have become important information communication tools for modern people due to their lightweight and convenient features.

In wireless communication equipment, the antenna used to transmit and receive radio waves to transmit and exchange data signals is also an essential component of communication equipment. In portable wireless communication equipment, not only the antenna should be thin and short, but the design should not occupy the space of the mechanism layout as far as possible, so as to meet the trend of shrinking the size of portable wireless communication equipment. Bandwidth also increases accordingly.

Due to the increasing demand for wireless data transmission of mobile communication products and the need to comply with the system specifications of various countries, in terms of antenna support, more operating frequency bands and bandwidths need to be covered to meet design requirements.

Therefore, an antenna that meets cost considerations and has multiple operating frequency bands and bandwidths needs to be developed.

Contents of the invention

Therefore, the object of the present invention is to provide a multi-frequency antenna device to solve the problem of insufficient frequency band and bandwidth.

One mode of the present invention is to provide a multi-frequency antenna device, the multi-frequency antenna device includes: a first antenna and a second antenna; the first antenna includes a feeding part and a first grounding part; the second antenna It is integrated with the first antenna, and includes the feed-in part and a second ground part; wherein the feed-in part is arranged between the first ground part and the second ground part, and the first antenna and the second antenna are in the This feed-in part is shared when sending and receiving signals.

According to an embodiment of the present invention, the first antenna further includes a first radiator and a second radiator. The first radiator is connected to the feeding part and the first grounding part, and is used for sending and receiving the first wireless signal. The second radiator is connected to the feed-in part and used for sending and receiving the second wireless signal.

According to an embodiment of the present invention, the first antenna further includes a slot which is at least surrounded by the first radiator and the second radiator, wherein the size of the slot corresponds to the frequency of the first wireless signal and the second wireless signal relevant.

According to an embodiment of the present invention, the second antenna further includes a radiator connected to the feeding part and the second grounding part and used for sending and receiving a wireless signal.

According to an embodiment of the present invention, the second antenna further includes a slot formed at least surrounded by the radiator, wherein the size of the slot is related to the frequency corresponding to the wireless signal.

According to an embodiment of the present invention, the distance between the feed-in portion and the first ground portion is substantially equal to the distance between the feed-in portion and the second ground portion.

According to an embodiment of the present invention, the first antenna further includes a first radiator and a second radiator, the second antenna further includes a third radiator, and the first radiator, the second radiator and the third radiator are all connected to In the feed-in part, the first radiator and the third radiator are used to send and receive the first high-frequency signal and the second high-frequency signal respectively, and the second radiator is used to send and receive a low-frequency signal.

According to an embodiment of the present invention, the first antenna further includes a first slot, at least surrounded by the first radiator and the second radiator, wherein the size of the slot corresponds to the frequencies of the first high-frequency signal and the low-frequency signal relevant.

According to an embodiment of the present invention, the second antenna further includes a second slot surrounded by at least the third radiator, wherein the size of the second slot is related to the frequency corresponding to the second high frequency signal.

According to an embodiment of the present invention, the first antenna is a planar inverted-F antenna, and the second antenna is a loop antenna.

To sum up the above, the present invention uses one feeding point and two grounding parts to combine the two antennas, and the mutual influence between the two antennas produces a multiplication effect to achieve a larger bandwidth and good antenna efficiency.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, the accompanying drawings are described as follows:

FIG. 1 is a schematic diagram of a multi-band antenna device according to an embodiment of the present invention.

FIG. 2A shows a back view of an embodiment of a multi-band antenna device according to the present invention.

FIG. 2B is a front view of the multi-band antenna device shown in FIG. 2A .

FIG. 3 is a schematic diagram showing the measured voltage standing wave ratio (VSWR) versus frequency of an embodiment of the multi-frequency antenna device.

FIG. 4 is a schematic diagram of a matching circuit in an embodiment of the multi-frequency antenna device according to the present invention.

Description of main component symbols:

100 Multi-frequency antenna device 110 First antenna

112 First grounding part 114 Feed-in part

116 first radiator 117 second radiator

118 Slots 119 Slots

120 second antenna 122 second grounding part

124 third radiator 126 slot

400 Matching circuits 410 Radio frequency communication equipment

420 Inductance 430 Capacitance

Detailed ways

In order to make the description of the present invention more detailed and complete, reference may be made to the attached drawings and various embodiments described below, and the same numbers in the drawings represent the same or similar components. On the other hand, well-known components and steps have not been described in the embodiments in order not to limit the invention unnecessarily.

In order to solve the problem of insufficient antenna working frequency band and bandwidth, two antennas are combined by using one feed point and two grounding parts. The first antenna structure includes a low-frequency structure and a high-frequency structure, and the second antenna structure contains a high-frequency structure. The design of this invention can optimize the bandwidth of the antenna and the influence of coexistence with other components through the position and size of the feed-in part and the two ground parts of the antenna, so as to achieve the purpose of improving the performance of the antenna.

Please refer to FIG. 1 , which shows a schematic diagram of a multi-frequency antenna device 100 according to an embodiment of the present invention. The multi-frequency antenna device 100 includes a first antenna 110 and a second antenna 120 . The first antenna 110 includes a first ground portion 112 and a feeding portion 114 . The second antenna 120 is integrated with the first antenna 110 and includes a feeding portion 114 and a second grounding portion 122 . The feed-in portion 114 is disposed between the first ground portion 112 and the second ground portion 122 , and the first antenna 110 and the second antenna 120 share the feed-in portion 114 when transmitting and receiving signals. By combining the two antennas, the effect of increasing the bandwidth can be achieved, and by using the same feed-in part, there is no need to bear more costs.

In actual operation, the distance between each grounding part and the feed-in part will affect the frequency offset or bandwidth change of the multi-frequency antenna device sending and receiving signals, and the design of different antenna structures and the actual antenna environment can determine the frequency to high frequency or high frequency. Low frequency offset, and determines the effect on bandwidth.

Next, please refer to FIG. 2A and FIG. 2B , FIG. 2A shows a back view of an embodiment of the multi-frequency antenna device 100 according to the present invention, and FIG. 2B shows a front view of the multi-frequency antenna device 100 in FIG. 2A . According to an embodiment of the present invention, the first antenna 110 further includes a first radiator 116 and a second radiator 117 . The first radiator 116 is connected to the feeding part 114 and the first ground part 112 and is used for sending and receiving the first wireless signal. The second radiator 117 is connected to the feeding part 114 and used for sending and receiving the second wireless signal. In practice, the first radiator 116 and the second radiator 117 can be metal. The first wireless signal and the second wireless signal can correspond to different frequencies, so as to achieve the multi-frequency effect.

According to an embodiment of the present invention, the first antenna 110 further includes a slot 118, which is at least surrounded by the first radiator 116 and the second radiator 117, wherein the size of the slot 118 is the same as that of the first wireless signal and the second wireless signal. The corresponding frequency is related, therefore, the frequency corresponding to the first wireless signal and the second wireless signal can be affected by adjusting the size of the slot 118, for example: adjusting the depth of the slot 118 (the depth is perpendicular to the first radiator 116 direction), when the depth of the slot 118 is not deep enough, the signal corresponding to the lower frequency frequency will deviate to the high frequency, if the depth is deep enough, it will be able to deviate to the low frequency, or when the slot spacing (the distance between the The direction refers to the direction in which the first radiator 116 is parallel to the second radiator 117 ) decreases to increase the layout area of the antenna, thereby increasing the bandwidth. In actual operation, it must be adjusted according to the size of the space on the mutual influence of the first wireless signal and the second wireless signal.

It is worth mentioning that, in one embodiment, the first antenna 110 further includes a slot 119, at least surrounded by the first radiator 116, for example: the first radiator 116 extends from the feeding part 114 around the slot 119 to the first ground portion 112 . The size of the slot 119 is related to the frequencies corresponding to the first wireless signal and the second wireless signal. For example, the deeper the slot 119, the wider the bandwidth of the lower frequency of the first wireless signal and the second wireless signal. In actual operation, the depth needs to be adjusted according to the requirements, and if the first antenna 110 is a planar inverted-F antenna (PIFA), the depth control must also match the basic working principle of the planar inverted-F antenna. In general, the slot 119 The layout area needs to be adjusted according to different environmental conditions.

According to an embodiment of the present invention, the second antenna 120 further includes a third radiator 124 connected to the feeding part 114 and the second grounding part 122 and used for sending and receiving a wireless signal.

According to an embodiment of the present invention, the second antenna further includes a slot 126, at least surrounded by the third radiator 124, wherein the size of the slot 126 is related to the frequency corresponding to the wireless signal, and can be adjusted by adjusting the size of the slot 126. The corresponding frequency and bandwidth of the wireless signal can be changed according to the size, and the slot 126 is similar to the slot 118 and the slot 119 , and the adjustment method is similar to the above, so it will not be repeated here.

According to an embodiment of the present invention, the distance between the feed-in portion 114 and the first ground portion 112 is substantially equal to the distance between the feed-in portion 114 and the second ground portion 122, for example, the distance is 1mm, and the distance is approximately equal for design convenience. However, the actual spacing must be coordinated with the antenna layout and the length of the antenna. As the aforementioned spacing can affect the frequency offset and bandwidth of the sending and receiving signals, those skilled in the art can adjust it according to the actual situation.

In addition, the design of the distance between the feeding part and the grounding part must also consider the mechanism of the communication product, because the communication product still has other components, such as: microphone, USB, oscillator, when these components are combined with the antenna to form a product, it may cause shielding effect And block radiation, so the design must pay special attention.

Furthermore, when designing the layout, the feeding part and the grounding part must be as close as possible. This has the advantage that the feeding part and the grounding part can be designed on the same printed circuit board, reducing interference with the mechanism.

According to an embodiment of the present invention, the first antenna 110 (including the first radiator 116 and the second radiator 117 ) and the second antenna 120 (including the third radiator 124 ) can be integrated to form a multi-frequency antenna device 100 . Here, the first radiator 116, the second radiator 117 and the third radiator 124 are all connected to the feed-in part 114, and the first radiator 116 and the third radiator 124 are used to send and receive the first high-frequency signal and the second high-frequency signal respectively. The second radiator 117 is used to send and receive a low frequency signal.

In actual operation, the frequencies corresponding to the first high-frequency signal, the second high-frequency signal and the low-frequency signal, for example: in the GSM900 system, the frequency corresponding to the low-frequency signal is 880MHz~960MHz; The frequency corresponding to the high frequency signal is 1710MHz~1990MHz; when used in the 3G WCDMABand1 system, the frequency corresponding to the second high frequency signal is 2110MHz~2170MHz. In one embodiment, the frequencies corresponding to the first high frequency signal and the second high frequency signal are respectively higher than the frequency corresponding to the low frequency signal, and the frequency corresponding to the first high frequency signal may be smaller than the frequency corresponding to the second high frequency signal .

In one embodiment, the first antenna 110 may also include a slot 118, at least surrounded by the first radiator 116 and the second radiator 117, for example: the first radiator 116 surrounds the slot 118 from the feeding part 114 extends to the first grounding part 112, and the second radiator 117 extends from the feeding part 114 to the other side of the first radiator 116 around the slot 118, as shown in FIG. 2A, wherein the size of the slot 118 is the same as that of the first The frequency correlation corresponding to the high-frequency signal and the low-frequency signal.

In one embodiment, the second antenna 120 further includes a slot 126 which is at least surrounded by the third radiator 124 , wherein the size of the slot 126 is related to the frequency corresponding to the second high frequency signal. For example: the third radiator 124 extends from the feed-in portion 114 to the second ground portion 122 around the slot 126 .

It should be noted that the second antenna 120 can also be controlled to receive low-frequency signals, but the size of the slot 126 must be adjusted. Therefore, the embodiment adopted here can achieve the effect of increasing multi-frequency at low cost.

In practice, the size of the slot 126 is smaller than the size of the slot 118 because the slot 118 mainly affects two signals (the first high frequency signal and the low frequency signal), while the slot 126 mainly affects only one signal (the second High-frequency signal), however, if different designs are made, the size of the slot 126 relative to the slot 118 is not limited here.

In one embodiment, the first antenna 110 may be a planar inverted-F antenna, and the second antenna 120 may be a loop antenna (loopantenna). In practical operation, the second antenna may also include antennas of different shapes with the same function.

As mentioned above, the distance between the ground part and the feeding part will affect the frequency offset or bandwidth of the antenna structure. When the second antenna 120 is a loop antenna, the loop antenna extends from the feeding part 114 and surrounds the slot 126. connected to the second ground portion 122 . In one embodiment, when the slot 126 in the loop coil is larger, the frequency of the signal affected by the slot 126 will shift to a lower frequency. In practice, the distance between the second grounding portion 122 and the feeding portion 114 is also related to the antenna layout, and those skilled in the art can select an appropriate distance according to the actual situation.

Next, please refer to FIG. 3 , which shows a schematic diagram of the measured VSWR versus frequency of an embodiment of the multi-frequency antenna device 100 . It can be seen from the figure that the frequency corresponding to the low-frequency signal is 880MHz-960MHz, the frequency corresponding to the first high-frequency signal is 1710MHz-1990MHz, and the frequency corresponding to the second high-frequency signal is 2110MHz-2170MHz. By combining the second high-frequency signal with the first The frequency matching of a high-frequency signal can achieve the effect of increasing the bandwidth and frequency band.

In addition, when the two antennas are combined according to the above, a matching circuit can be added to generate a more adaptive bandwidth, for example, capacitors and inductance components are arranged at the front end of the feed-in part to optimize the high-frequency bandwidth. That is to say, if the planar inverted-F antenna and the coil antenna are integrated, when the two antennas are close to each other, they can be matched by a circuit with capacitance and inductance components to optimize the bandwidth and frequency band. In one embodiment, the high-frequency antenna adopts a matching circuit with series inductors and parallel capacitors.

Next, please refer to FIG. 4 , which shows a schematic diagram of a matching circuit 400 in an embodiment of the multi-band antenna device 100 according to the present invention. In this embodiment, the matching circuit 400 includes an inductor 420 and a capacitor 430, the inductor 420 is connected between the feeding part 114 and the radio frequency (RF) communication device 410, and the capacitor 430 is connected between the feeding part 114 and the ground terminal, so that The multi-frequency antenna device 100 can achieve the effect of optimizing bandwidth and frequency band.

To sum up the above, the design of this antenna is to integrate the two antenna structures with one feed point and two ground points. The bandwidth of the antenna can be increased by combining the two antennas, for example: to generate a low frequency resonance and two high frequency resonance. The low-frequency resonance and high-frequency resonance in the antenna structure can use the size of the slot to adjust the operating frequency and impedance bandwidth to achieve the required operating frequency and impedance bandwidth.

In addition, the distance between the antenna feeding point and the two grounding points is the same distance, which reduces the complexity of manufacturing design. Secondly, the feeding part and the grounding part of the antenna can be narrowed so that they can be designed on the same printed circuit board, so that they can coexist with other functional components, and even on a metal plane, they can still have good impedance bandwidth and radiation efficiency.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Any person skilled in the art should be able to make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the scope of the appended claims.

Claims (10)

1. A multi-frequency antenna device, the multi-frequency antenna device comprising: a first antenna, the first antenna includes a feeding part and a first grounding part; and a second antenna, the second antenna is integrated with the first antenna, and includes the feeding part and a second grounding part; Wherein the feed-in portion is disposed between the first ground portion and the second ground portion, and the first antenna and the second antenna share the feed-in portion when transmitting and receiving signals. 2. The multi-frequency antenna device as claimed in claim 1, wherein the first antenna further comprises: a first radiator, the first radiator is connected to the feed-in part and the first ground part, and is used to send and receive a first wireless signal; and A second radiator, the second radiator is connected to the feed-in part, and is used for sending and receiving a second wireless signal. 3. The multi-frequency antenna device as claimed in claim 2, wherein the first antenna further comprises: A slot, the slot is at least surrounded by the first radiator and the second radiator, wherein the size of the slot is related to the frequency corresponding to the first wireless signal and the second wireless signal. 4. The multi-frequency antenna device as claimed in claim 1, wherein the second antenna further comprises: A radiator, the radiator is connected to the feed-in part and the second ground part, and is used for sending and receiving a wireless signal. 5. The multi-frequency antenna device as claimed in claim 4, wherein the second antenna further comprises: A slot, the slot is at least surrounded by the radiator, wherein the size of the slot is related to the frequency corresponding to the wireless signal. 6. The multi-frequency antenna device as claimed in claim 1, wherein a distance between the feeding portion and the first ground portion is substantially equal to a distance between the feeding portion and the second ground portion. 7. The multi-frequency antenna device as claimed in claim 1, wherein the first antenna further comprises a first radiator and a second radiator, the second antenna further comprises a third radiator, the first radiator , the second radiator and the third radiator are both connected to the feed-in part, the first radiator and the third radiator are respectively used to send and receive a first high-frequency signal and a second high-frequency signal, the first The two radiators are used for sending and receiving a low frequency signal. 8. The multi-frequency antenna device as claimed in claim 7, wherein the first antenna further comprises: A first slot, the first slot is at least surrounded by the first radiator and the second radiator, wherein the size of the first slot corresponds to the frequency corresponding to the first high-frequency signal and the low-frequency signal relevant. 9. The multi-frequency antenna device as claimed in claim 8, wherein the second antenna further comprises: A second slot, the second slot is at least surrounded by the third radiator, wherein the size of the second slot is related to the frequency corresponding to the second high frequency signal. 10. The multi-frequency antenna device as claimed in claim 1, wherein the first antenna is a planar inverted-F antenna, and the second antenna is a loop antenna.

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