TWI655805B - Folded slot antennas - Google Patents

Abstract

The main body of the present disclosure discloses a folded slot antenna comprising a first radiating strip having a first slot for supporting a first predetermined frequency band and a second predetermined frequency band. The folded slot antenna further includes a second radiating strip having a second slot, and one end of the second slot is connected to the first slot. The folded slot antenna also includes a third radiating strip having a third slot connected to the other end of the second slot. The first slot, the second slot and the third slot are coupled to form a continuous folded slot for supporting a third predetermined frequency band. A dielectric portion disposed between the first radiation strip and the third radiation strip is adapted to receive an antenna feed structure for the first radiation strip and the third radiation strip.

Description

Folded slot antenna

The present invention relates to a folded slot antenna.

The communication device includes a slot antenna for communication purposes. Such slot antennas typically include a long straight slot that operates in a predetermined harmonic resonance mode to allow the slot antennas to operate in different frequency bands. These different frequency bands allow the communication device to operate and support different standards of wireless communication. As wireless communication standards continue to evolve and evolve, slot antennas have also been modified to support additional frequency bands for wireless communications that are updated to the new standard.

According to an embodiment of the present invention, a folded slot antenna is specifically provided, comprising: a first radiating strip having a first slot for supporting a first predetermined frequency band and a second predetermined frequency band; a second radiant strip having a second slot, wherein one end of the second slot is connected to the first slot; and a third radiant strip having a third slot, the third slot is connected The other end of the second slot, wherein the first slot, the second slot, and the third slot are connected to form a continuous folded slot for supporting a third predetermined frequency band; a dielectric portion disposed between the first radiation strip and the third radiation strip, the dielectric portion for receiving an antenna feed for the first radiation strip and the third radiation strip structure.

This body is about a folded slot antenna. Communication devices typically include slot antennas for communicating with other devices, such as communication devices and network devices. Such slot antennas typically include a long straight slot that operates in a predetermined harmonic resonance mode to allow the slot antenna to operate in different frequency bands. The slot antennas support first and third harmonic resonance modes allowing the slot antennas to operate in the low frequency band (approximately 704 megahertz (MHz) to 960 MHz) and the high frequency band (approximately 2500 MHz to 2690 MHz) operating. However, such slot antennas may not support the second harmonic resonance mode and may therefore not operate in a mid-band (approximately 1710 MHz to 2170 MHz).

An exemplary embodiment of a slot antenna supporting one of a first harmonic resonance mode, a second harmonic resonance mode, and a third harmonic resonance mode is described. According to one of the main contents of the present case, the slot antenna is a folded slot antenna. In this example, the folded slot antenna includes a first radiant strip having a first slot, a second radiant strip having a second slot, a third radiant strip having a third slot, and a dielectric portion disposed between the first radiation strip and the third radiation strip. In an exemplary embodiment, one end of the second slot is connected to the first slot, and the other end of the second slot is connected to the third slot to form a continuous folded slot. The continuous folded slot provides a resonant length adapted to support the second harmonic resonance mode, thereby allowing the folded slot antenna to operate in the mid-band. Moreover, the first slot supports the operation of the folded slot antenna to operate in a low frequency band and a high frequency band.

In one example, the third strip of radiation is disposed substantially parallel to the first strip of radiation such that a bottom surface of the dielectric portion is attached to the first strip of radiation and a top surface of the dielectric portion is attached to The third radiation strip. The second radiation strip is disposed substantially perpendicularly between the first radiation strip and the third radiation strip such that one side of the dielectric portion is attached to the second radiation strip. And, the dielectric portion houses an antenna feeding structure for the first radiation strip and the third radiation strip.

In an exemplary embodiment of the subject matter of the present disclosure, the first radiant strip includes a first metal layer having a first slot and a first printed circuit board (PCB) attached to one side To the first metal layer and to the antenna feed structure on the other side. In one example, the first metal layer can be a back cover member of the device housing of one of the communication devices having the folded slot antenna. The second radiating strip includes a second metal layer formed along a first side of the first PCB and a first side of the dielectric portion. The third radiating strip may include a third metal layer having a third slot and a second PCB attached to the third metal layer on one side and coupled to the other side on the other side Electrical part and antenna feed structure.

The main content of the case thus facilitates operation of a slot antenna in the low frequency band, the medium frequency band and the high frequency band. The first slot is energized in the first harmonic resonance mode and the third harmonic resonance mode to allow the folded slot antenna to operate in the low frequency band and the high frequency band, respectively. This continuously folded slot is energized in the second harmonic resonance mode to allow the folded slot antenna to operate in the mid-band. A communication device with a folded slot antenna can thus support different standards of wireless communication.

The main content of the present case is further described with reference to FIGS. 1 to 5. It should be understood that the description and drawings only illustrate the principles of the subject matter of the present invention. Although not explicitly described or shown herein, various configurations may be invented to cover the principles of the subject matter of the present disclosure. In addition, all the statements, principles, examples and examples of the subject matter of the subject matter listed herein are intended to cover their equivalents.

FIG. 1 is a block diagram of a folded slot antenna 102 according to an exemplary embodiment of the subject matter of the present disclosure. The folded slot antenna 102 can be found in a communication device such as a desktop computer, a laptop computer, a smart phone, a personal digital assistant (PDA), a tablet computer, a notebook computer, and an all-in-one computer. In one example, the folded slot antenna 102 can be incorporated into one of the device housings of the communication device.

According to an exemplary embodiment of the subject matter of the present disclosure, the folded slot antenna 102 includes a first radiating strip 104, a second radiating strip 106, and a third radiating strip 108. The first radiant strip 104 includes a first slot 110. The second radiating strip 106 includes a second slot 112. The third radiant strip 108 includes a first slot 114. In one example, one end of the second slot 112 is coupled to the first slot 110 and the other end of the second slot 112 is coupled to the third slot 114 to form a continuous folded slot. The folded slot antenna 102 further includes a dielectric portion 116 disposed between the first radiating strip 104 and the third radiating strip 108. The dielectric portion 116 houses an antenna feed structure 118 for the first radiating strip 104 and the third radiating strip 108.

The antenna feed structure 118 can provide input feeds to the first and second radiating strips 104 and 108 to operate the folded slot antennas over a plurality of predetermined frequency bands. In one example, the antenna feed structure 118 can provide an input feed to the first radiant strip 104 to energize the first slot 110 to support a first predetermined frequency band and a second predetermined frequency band. The antenna feed structure 118 can further provide an input feed to the second radiating strip 104 to energize the continuous folded slot to support a third predetermined frequency band. In an example, the first predetermined frequency band is a low frequency band in the range of about 704 megahertz (MHz) to 960 MHz. This second predetermined frequency band is a high frequency band in the range of approximately 2500 MHz to 2690 MHz. This third predetermined frequency band is a mid-band in the range of 1710 MHz to 2170 MHz.

FIG. 2 illustrates a communication device 200 incorporated into a folded slot antenna 102 in accordance with an exemplary embodiment of the subject matter of the present disclosure. In one example, communication device 200 is depicted as a laptop. As mentioned previously, examples of the communication device 200 may further include, but are not limited to, a desktop computer, a smart phone, a personal digital assistant (PDA), a tablet computer, a notebook computer, and an all-in-one computer.

In one example, communication device 200 includes a device housing 202. The device housing 202 can support and hold a variety of components, such as a display of the communication device 200. In one example, the folded slot antenna 102 can be disposed on the device housing 202 such that the first radiating strip 104 is disposed on one surface 204 of the device housing 202. The first radiating strip 104 includes a first slot 110 that supports a first predetermined frequency band and a second predetermined frequency band.

The folded slot antenna 102 can further include a second radiant strip 106 having a second slot 112. In one example, one end of the second slot 112 is coupled to the first slot 110. The folded slot antenna 102 also includes a third radiating strip 108 having a third slot 114 that is coupled to the other end of the second slot 112. The first slot 110, the second slot 112, and the third slot 114 can thus be joined to form a continuous folded slot for supporting a third predetermined frequency band.

Also, the dielectric portion 116 can be disposed between the first radiation strip 104 and the third radiation strip 108. As previously described, the dielectric portion 116 can house the antenna feed structure 118 for the first and second radiating strips 104, 108.

FIG. 3 illustrates a block diagram of a device housing 300 having a folded slot antenna 102, according to one of the main contents of the present disclosure. The device housing 300 can support and hold a variety of components, such as a display of a communication device. For example, device housing 300 can be device housing 202 of communication device 200. The device housing 300 can include a metal cover member 302 disposed on one side of one of the surfaces of the device housing 300, such as an outer surface. In an example, the metal cover 302 can be disposed on an outer side of an outer surface of the device housing 300. For example, the metal cover member 302 can be disposed on an outer side of the surface 204 of the device housing 202 depicted in FIG. In an example, the metal cover 302 can include a first slot 110.

The device housing 300 can further include a first printed circuit board (PCB) 304 attached to the first slot 110 to form a first radiant strip 104. The device housing 300 further includes a second radiant strip 106 having a second slot 112. In one example, one end of the second slot 112 is coupled to the first slot 110. Moreover, the second slot 112 is perpendicular to the first slot 110. The device housing 300 can further include a second PCB 306 that is coupled to the second radiant strip 106. In one example, a metal layer 308 is attached to the second PCB 306 to form a third radiant strip 108. The metal layer 308 includes a third slot 114 disposed parallel to the first slot 110 and perpendicular to the second slot 112. Moreover, the third slot 114 is coupled to the other end of the second slot 112 such that the first slot 110, the second slot 112, and the third slot 114 are interconnected to form a continuous folded slot. As described previously, this continuous folded slot supports a third predetermined frequency band.

FIG. 4 illustrates a block diagram of the folded slot antenna 102 in accordance with another exemplary embodiment of the subject matter of the present disclosure. As previously described, the folded slot antenna 102 can be incorporated into a communication device for wireless communication via a plurality of predetermined frequency bands. In an example, the plurality of predetermined frequency bands may include, but are not limited to, a low frequency band in the range of approximately 704 MHz to 960 MHz, a medium frequency band in the range of approximately 1710 MHz to 2170 MHz, and a frequency range of approximately 2500 MHz to 2690 MHz. High frequency band within range.

As previously described, the folded slot antenna 102 can include a first radiant strip 104 having a first slot 110, a second radiant strip 106 having a second slot 112, and a third having a third slot 114 Radiation strip 108. As shown in FIG. 4, the first radiant strip 104 is disposed parallel to the third radiant strip 108, and the second radiant strip 106 is disposed substantially perpendicular to the first strip 104 and the third strip 108.

The folded slot antenna 102 can further include a dielectric portion 116 disposed between the first radiating strip 104, the second radiating strip 106, and the third radiating strip 108. The dielectric portion 116 can be disposed such that one of the bottom surfaces 402 of the dielectric portion 116 is attached to the first radiant strip 104 and one of the top surfaces 404 of the dielectric portion 116 is attached to the third radiant strip 108. In one example, the dielectric portion 116 can be a dielectric portion having a predetermined dielectric constant such that the dielectric portion 116 can avoid dielectric loss during operation of the folded slot antenna 102. For example, the dielectric portion 116 can be a sponge or a piece of plastic having a dielectric constant of about 2.2.

In one example, the first radiant strip 104 includes a first PCB 304 that is attached to the first slot 110 and that is disposed on a first metal layer 406. The first metal layer 406 can be, in one example, a metal cover member 302 disposed on the surface of the device housing 300 of the communication device having the folded slot antenna 102. This first metal layer 406 is in another example a portion of the metal cover 302. Moreover, the first slot 110 extends up to a first predetermined resonant length to support the first predetermined frequency band and the second predetermined frequency band. In one example, the length of the first slot 110 can be equal to 90 millimeters (mm) for supporting the first predetermined frequency band and the second predetermined frequency band in the communication device 200, such as a laptop computer and a notebook computer.

The first PCB 304 is attached to the first metal layer 406 on one side, covering a substantial length of one of the first slots 110. In one example, the first PCB has a length of 70 millimeters (mm). In addition, the first PCB 304 includes an antenna feed structure 118 on the other side in contact with the bottom surface 402 of the dielectric portion 116.

The second strip 106 includes a second metal layer 408 formed along the first side 410 of the first PCB 304 and the first side 412 of the dielectric portion 116. This second metal layer 408 includes a second slot 112 that extends through the entire length of the second strip 106. In one example, the length of the second slot 112 on the second radiating strip 106 and the second metal layer 408 is equal to about 2.5 mm. In one example, the second metal layer 408 can be formed by providing a metal coating such as copper over the first side 410 of the first PCB 304 and the first side 412 of the dielectric portion 116. In this example, the metal coating can be etched to form the second slot 112.

In one example, the third radiant strip 108 includes a third metal layer, such as a metal layer 308 that is attached to the second PCB 306. As previously described, the third metal layer 308 includes a third slot 114 that extends along the length of the third radiating strip 108. In one example, the length of the third radiant strip 108 and the third slot 114 is equal to about 30 mm. The second PCB 306 is attached to the third metal layer 308 on a first side and to the antenna feed structure 118 on a second side in contact with the top surface 404 of the dielectric portion 116. In one example, the third metal layer 308 can be formed by providing a metal coating such as copper over the first side of the second PCB 306. In this example, the metal coating can be etched to form a third slot 114. In another example, a single sheet of metal layer can be used as the third radiant strip 108 in place of the second PCB 306 plated with a metal layer.

Moreover, as previously described, one end of the second slot 112 is coupled to the first slot 110 and the other end of the second slot 112 is coupled to the third slot 114. The first slot 110, the second slot 112, and the third slot 114 are thus joined together to form a continuous folded slot. In one example, the length of the continuous folded slot may be equal to a second predetermined resonant length that supports the third predetermined frequency band. For example, the length of the continuously folded slot can be equal to about 122.5 mm to support a third predetermined frequency band in the communication device 200, such as a laptop and notebook.

The first PCB 304 and the second PCB 306 can be composed of any suitable circuit board material, such as a dielectric material. By way of example, the PCB can be composed of SR4 materials. In other examples, the PCB can be made of prepreg materials such as FR-2 (phenolic tissue), FR-3 (cotton and epoxy), and FR-4 (woven glass and epoxy). Several variations of FR-4 can also be used, such as FR-408 and Polyclad 370HR.

Moreover, as previously described, the first PCB 304 includes an antenna feed structure 118. This antenna feed structure 118 can be housed within the dielectric portion 116. In one example, the antenna feed structure 118 can be a double-sided flex print circuit (FPC) feed line such that a single antenna feed structure 118 can be used for the first radiation strip 104 and the third radiation strip 108 Provide input feeds. For example, the antenna feed structure 118 is coupled to the first metal layer 406 to provide a first input feed to the first radiant strip 104 to drive the continuous folded slots at a first frequency and a second frequency. This first input feed provides current on the first metal layer 406 to cause the magnetic current to flow in the first slot 110. The first slot 110 of the continuously folded slot can thus operate in a base first resonant mode and a third resonant mode to support the first predetermined frequency band and the second predetermined frequency band.

The antenna feed structure 118 is further coupled to the second PCB 306 to provide a second input feed to the third radiant strip 108 to drive the continuous folded slot at a third frequency. This second input feed provides a current on the second metal layer 308 to cause the magnetic current to flow in the continuous folded slot. In one example, the magnetic flow may flow in a predetermined region within the continuous folded slot. This continuously folded slot can thus operate in the second resonant mode to support a third predetermined frequency band.

FIG. 5 illustrates a block diagram 100 of the antenna feed structure 116 in accordance with another example of the subject matter of the present disclosure. As previously described, the antenna feed structure 118 can be a double-sided FPC feed line such that a single antenna feed structure 118 can be used to provide input feed to the first and second radiating strips 104, 108. In an example, the first feed line 502 of the antenna feed structure 118 can provide input feed to the first radiant strip 104. The second feed line 504 of the antenna feed structure 118 can provide an input feed to the third radiant strip 108. As shown, the first feed line 502 and the second feed line 504 can intersect and be joined to a common feed junction 506.

In an example, the first feed line 502 can include a first lateral feed line 508 and a first longitudinal feed line 510. This first transverse feed line 508 can be about 20 mm long, while the first longitudinal feed line 510 can be about 7 mm long. The second feed line 504 can include a second lateral feed line 512 and a second longitudinal feed line 514. This second transverse feed line 512 can be about 35 mm long, while the second longitudinal feed line 514 can be about 5 mm long.

Antenna feed structure 116 can further include an inductor 516 coupled to first metal layer 406. In one example, the inductor 516 can have an inductance of about 5.8 Nai Henry (nH).

Although the examples of the subject matter of the present invention have been described in terms of structural features and/or methods, it should be understood that the scope of the appended claims is not limited to the specific features and methods. These specific features and methods are merely disclosed and explained as examples of the subject matter of the present disclosure.

100‧‧‧block map

102‧‧‧Folding slot antenna

104‧‧‧First radiation strip

106‧‧‧second (radiation) strip

108‧‧‧ Third radiation strip

110‧‧‧first slot

112‧‧‧Second slot

114‧‧‧ third slot

116‧‧‧Dielectric Department

118‧‧‧Antenna feed structure

200‧‧‧Communication device

202, 300‧‧‧ device housing

204‧‧‧ surface

302‧‧‧Metal cover

304‧‧‧First printed circuit board (PCB)

306‧‧‧second PCB

308‧‧‧metal layer

402‧‧‧ bottom surface

404‧‧‧ top surface

406‧‧‧First metal layer

408‧‧‧Second metal layer

410, 412‧‧‧ second side

502‧‧‧first feed line

504‧‧‧second feed line

506‧‧‧Shared feed joints

508‧‧‧First horizontal feed line

510‧‧‧First vertical feed line

512‧‧‧second horizontal feed line

514‧‧‧second longitudinal feed line

516‧‧‧Inductors

The detailed description is discussed with reference to the drawings. It should be noted that the description and drawings are merely examples of the subject matter of the present invention and are not representative of the subject matter itself.

FIG. 1 is a block diagram showing a folded slot antenna according to an example of the main content of the present application.

2 is a block diagram of a communication device of one of the folded slot antennas according to another example of the subject matter of the present disclosure.

FIG. 3 illustrates a block diagram of a device housing having a folded slot antenna, according to one of the main contents of the present disclosure.

4 is a block diagram of a folded slot antenna according to another example of the subject matter of the present disclosure.

FIG. 5 is a block diagram showing an antenna feeding structure of a folded slot antenna according to another example of the main content of the present disclosure.

Claims (15)

A folded slot antenna comprising: a first radiating strip having a first slot to support a first predetermined frequency band and a second predetermined frequency band; and a second radiating strip having a second slot One end of the second slot is connected to the first slot; a third strip has a third slot, and the third slot is connected to the other end of the second slot, wherein the first slot The slot, the second slot, and the third slot are connected to form a continuous folded slot for supporting a third predetermined frequency band; and a dielectric portion disposed on the first radiating strip The dielectric portion is configured to receive an antenna feeding structure for the first radiation strip and the third radiation strip. The folded slot antenna of claim 1, wherein the first radiating strip comprises: a first metal layer having one of the first slots; and a first printed circuit board (PCB) attached to one side Up to the first metal layer, and having the antenna feed structure on the other side, wherein the antenna feed structure is configured to provide a first input feed to the first radiation strip to be at a first frequency And driving the continuous folded slot at a second frequency. The folded slot antenna of claim 2, wherein the second radiating strip comprises a second metal layer formed along a first side of the first PCB and a first side of the dielectric portion, and wherein the second metal layer The two radiation strips are disposed perpendicular to the first radiation strip and the third radiation strip. The folded slot antenna of claim 1, wherein the third radiating strip comprises: a third metal layer having the third slot; and a second PCB attached to the third metal on one side a layer coupled to the dielectric portion and the antenna feed structure on the other side, wherein the antenna feed structure is configured to provide a second input feed to the third radiation strip for use in a third The continuous folded slot is driven at a frequency. The folded slot antenna of claim 1, wherein the first slot is about 90 mm long, and wherein the second slot is about 2.5 mm long, and wherein the third slot is about 30 mm long . The folded slot antenna of claim 1, wherein the first predetermined frequency band is a low frequency band in a range of about 704 megahertz (MHz) to 960 MHz, and the second predetermined frequency band is in a range of about 2500 MHz to 2690 MHz. A high frequency band, and the third predetermined frequency band is a mid-band in the range of about 1710 MHz to 2170 MHz. The folded slot antenna of claim 1, wherein a bottom surface of the dielectric portion is attached to the first radiation strip, a top surface of the dielectric portion is attached to the third radiation strip, and the medium One side of the electrical portion is attached to a metal layer of the second radiation strip. A communication device includes: a device housing; and a folded slot antenna disposed on the device housing, the folded slot antenna comprising: a first device disposed on a surface of the device housing Radiation belt a first radiant strip having a first slot for supporting a first predetermined frequency band and a second predetermined frequency band; a second radiant strip having a second slot, wherein the second slot One end is connected to the first slot; a third radiating strip has a third slot connected to the other end of the second slot, such that the first slot, the second slot, and the The third slot is connected to form a continuous folded slot for supporting a third predetermined frequency band; and a dielectric portion disposed between the first radiating strip and the third radiating strip, wherein the dielectric The portion is configured to receive an antenna feeding structure for the first radiation strip and the third radiation strip. The communication device of claim 8, wherein the first radiation strip comprises: a first metal layer having the first slot, wherein the first metal layer is the surface of the device housing; and a first a printed circuit board (PCB) attached to the first metal layer on one side and the antenna feed structure on the other side, wherein the antenna feed structure is for the first radiation strip A first input feed is provided to drive the continuous folded slot at a first frequency and a second frequency. The communication device of claim 9, wherein the second radiation strip comprises a second metal layer formed along a first side of the first PCB and a first side of the dielectric portion, and wherein the second radiation The strip is disposed perpendicular to the first strip and the third strip. The communication device of claim 8, wherein the third radiation The strip includes: a third metal layer having the third slot; and a second PCB attached to the third metal layer on one side and coupled to the dielectric portion on the other side The antenna feed structure, wherein the antenna feed structure is configured to provide a second input feed to the third radiating strip to drive the continuous folded slot at a third frequency. The communication device of claim 8, wherein the first slot has a first predetermined resonant length for supporting the first predetermined frequency band and the second predetermined frequency band, and wherein the continuous folded slot has a a second predetermined resonant length of the predetermined frequency band. A device housing comprising a folded slot antenna for wireless communication, the device housing comprising: a metal cover member disposed on a side of a surface of the device housing, wherein the metal cover member comprises a a first slot; a first printed circuit board (PCB) attached to the first slot to form a first radiant strip; a second radiant strip having a second slot, wherein the second One end of the slot is connected to the first slot, and wherein the second slot is perpendicular to the first slot; and attached to the second PCB connected to one of the second radiating strips to form a third a metal layer of the radiant strip, the metal layer having a third slot connected to the other end of the second slot, wherein the first slot, the second slot and the third slot are connected Forming a continuous folded slot for supporting a third predetermined frequency band, and wherein the third slot is parallel to the first slot And perpendicular to the second slot. The device housing of claim 13, wherein the first PCB comprises: an antenna feed on one side, configured to: provide a first input feed to the first radiant strip to Driving the continuous folded slot at a frequency and a second frequency; and providing a second input feed to the third radiating strip to drive the continuous folded slot at a third frequency. The device housing of claim 13 further comprising a dielectric portion having a predetermined height mounted on the first PCB to receive the antenna feed structure, wherein a bottom surface of the dielectric portion is coupled to The first radiating strip, a top surface of the dielectric portion is coupled to the third radiating strip, and one side of the dielectric portion is coupled to a metal layer of the second radiating strip.