Radio-frequency switching circuit and method for operating the same

Abstract

A radio frequency (RF) switching circuit includes a first antenna, a second antenna, a power divider, and a frequency divider unit. The first antenna is adjacent to an RF interference source. The second antenna is positioned outside the interference distance of the RF interference source. The first and second input ports of the power divider are coupled to the first antenna and the second antenna, respectively. The frequency divider unit is coupled to the output port of the power divider.

Description

[Technical Field]

[0001] This disclosure relates to a radio frequency switch circuit and its operation method, and more particularly to a radio frequency switch circuit and its operation method that operate effectively under radio frequency interference. [Previous Technology]

[0002] In electronic devices, due to chip specifications, antennas must be placed in specific locations. However, these specific locations may be unsuitable for receiving certain frequency bands due to the influence of nearby radio frequency interference sources, resulting in a poor user experience. For example, a common problem is the inability to receive signals from global navigation satellite systems (GNSS), such as the US Global Position System (GPS), Russia's GLONASS, China's BeiDou Navigation Satellite System (BDS), and the EU's Galileo satellite navigation system.

[0003] In this information age, location services are used for both outdoor activities (such as finding a location) and indoor internet browsing (such as using food delivery services). Navigation systems have become almost indispensable in everyone's daily life. Therefore, it is necessary to solve the problem of not being able to receive GPS signals due to chip specification limitations.

[0004] Overcoming the above problems by directly changing the chip specifications would result in high costs. Therefore, this disclosure provides a lower-cost solution. [Summary of the Invention]

[0005] This disclosure provides a radio frequency (RF) switching circuit, which includes a first antenna, a second antenna, a power divider, and a frequency divider unit. The first antenna is adjacent to an RF interference source. The second antenna is positioned outside the interference distance of the RF interference source. The first input port and the second input port of the power divider are coupled to the first antenna and the second antenna, respectively. The frequency divider unit is coupled to the output port of the power divider.

[0006] This disclosure provides a method for operating a radio frequency switching circuit, comprising the following steps: receiving multiple input signals by multiple antennas and transmitting these input signals to multiple input ports of a power divider respectively; the power divider further combining these input signals into an integrated signal and outputting the integrated signal to a frequency divider unit; and the frequency divider unit further dividing the integrated signal into multiple signal components with different frequency bands.

[0007] In summary, the display method disclosed herein can switch the user interface of an application from a window or widget to the status bar, thereby avoiding obscuring the content of other windows below and thus improving the user experience.

Implementation Method

[0009] The following detailed description is based on embodiments and accompanying drawings. However, the provided embodiments are not intended to limit the scope of this disclosure, and the description of the structural operation is not intended to limit the order of execution. Any structure resulting from the recombination of elements and producing a device with equivalent functionality is within the scope of this disclosure. Furthermore, the illustrations are for illustrative purposes only and are not drawn to their original dimensions. For ease of understanding, the same or similar elements will be labeled with the same symbols in the following description.

[0010] Unless otherwise specified, the terms used throughout the specification and the scope of the patent application generally have the ordinary meaning of each term in the context of the field, the content disclosed herein, and the specific content.

[0011] As used herein, “about,” “approximately,” “approximately,” or “substantially” generally mean within 20%, 10%, or 5% of a given value or range. The numerical quantities given herein are approximate, meaning that in the absence of explicit specification, the terms “about,” “approximately,” “approximately,” or “substantially” may be speculative.

[0012] Spatial relative terms such as “below,” “under,” “lower,” “above,” “upper,” etc., may be used herein for descriptive purposes to describe the relationship between one element or feature as shown in the accompanying drawings and another element or feature. Spatial relative terms are intended to cover different orientations of the device in use or operation other than those shown in the accompanying drawings. The device may be oriented in other ways (rotated 90 degrees or otherwise) and the spatial relative descriptors used herein may be interpreted accordingly.

[0013] The term “coupled” or “connected” as used herein can refer to two or more components making direct physical or electrical contact with each other, or making indirect physical or electrical contact with each other, or to two or more components operating or moving with each other.

[0014] Please refer to Figure 1. Figure 1 is a schematic diagram of an electronic device 100 according to some embodiments of the present disclosure. As shown in Figure 1, the electronic device 100 includes an edge 110 and a body 120. Specifically, the electronic device 100 may be a tablet computer, a laptop computer, a desktop computer, an in-vehicle computer, a mobile phone, and a game console, etc. The edge 110 includes spaces 111-114. The electronic device 100 extends along directions X and Y. Directions X and Y are perpendicular to each other.

[0015] In direction X, each of spaces 111 and 112 is located on one side of body 120, and space 114 is located on the other side of body 120. Space 113 is located on one side of body 120 in direction Y. Spaces 111-114 can be used to accommodate antennas or connectors, wherein the connectors can be USB connectors, HDMI connectors, HML connectors, DisplayPort connectors, and Thunderbolt connectors, etc. In other words, in some embodiments, the size of edge 110 is at least larger than the size of the antenna and / or connector so that the antenna and / or connector can be placed in spaces 111-114. When the connector is transmitting data, the connector will cause radio frequency interference to the reception of the antenna near the connector.

[0016] For example, when a USB connector is transmitting data, the antenna near the USB connector may experience poor reception quality or even no signal at all for a specific frequency band, such as the L1 band of GPS (1575.42±30.69MHz). Therefore, a USB connector transmitting data can be considered a source of radio frequency interference, and the USB connector is one of the most common sources of radio frequency interference for electronic device 100. As another example, a USB connector is located in space 111 and an antenna is located in space 112 adjacent to space 111. When the USB connector in space 111 is transmitting data, the antenna in space 112 will experience interference.

[0017] However, when the antenna is beyond an interference distance from the radio frequency interference source, the antenna's reception is considered unaffected by the radio frequency interference source. In some embodiments, the radio frequency interference distance is determined based on the signal-to-noise ratio (SNR). For example, as the antenna moves outward from the center of the radio frequency interference source, the SNR gradually increases. When the SNR equals 20 dB, the distance between the antenna and the center of the interference source is considered the interference distance.

[0018] In some embodiments, the radio frequency interference distance is determined based on the carrier-to-noise ratio (CN value). For example, as the antenna moves outward from the center of the radio frequency interference source, the CN value gradually increases. When the CN value is 30 dB, the distance between the antenna and the center of the interference source is considered the interference distance. In some embodiments, when the distance between the antenna and the center of the radio frequency interference source is approximately 15 cm, the CN value is approximately 30 dB, while when the distance between the antenna and the center of the radio frequency interference source is less than 1.5 cm, the CN value is almost zero. Therefore, 15 cm can be used as the interference distance.

[0019] In some embodiments, the interference distance is determined based on the type of radio frequency interference source. Specifically, when the radio frequency interference source is a USB connector, HDMI connector, HML connector, DisplayPort connector, or Thunderbolt connector, the interference distance may be less than 15 cm. In some embodiments, in addition to the type of connector, the interference distance is also determined based on the adapter cable and control cable.

[0020] Furthermore, the length L of a typical tablet computer is approximately 7 to 12.9 inches, or 17.8 to 32.8 centimeters. The length L of a typical notebook computer is approximately 10 to 17 inches, or 25.4 to 43.2 centimeters. The length L of a typical desktop computer is approximately 24 to 30 centimeters. Here, length L is the length of the electronic device 100 minus edge 110, approximately the vertical distance between spaces 112 and 114. In other words, the interference distance can be less than the length L of the tablet computer, notebook computer, and desktop computer. Therefore, at least for tablet computers, notebook computers, and desktop computers, the inadequacy of the antenna located in space 112 can be compensated by setting up another antenna for receiving signals in the aforementioned specific frequency band.

[0021] Please refer to Figures 1 and 2 together. Figure 2 is a schematic diagram of an RF switch circuit 200 according to some embodiments of the present disclosure. In some embodiments, the RF switch circuit 200 is disposed in an electronic device 100. As shown in Figure 2, the RF switch circuit 200 includes an antenna 210, an antenna 220, a power divider 230, and a frequency division unit 240. The antenna 210 is adjacent to an RF interference source rfo (not shown). In other words, the antenna 210 is the antenna in the RF switch circuit 200 most affected by the RF interference source rfo. In some embodiments, the antenna 210 is determined according to the CN value. Specifically, the antenna with the smallest CN value is the antenna 210. In some embodiments, in the absence of an RF shield, the antenna 210 is the antenna in the RF switch circuit 200 closest to the RF interference source rfo.

[0022] In some embodiments, as previously described, the antenna 210 and the radio frequency interference source (RFF) are disposed in two adjacent spaces 111 and 112, as shown in Figure 1, for accommodating the antenna or connector. Specifically, the antenna 210 is disposed in space 111, and the RFF is disposed in space 112. For ease of explanation, this arrangement will be used as an example in the following paragraphs, but it is not intended to limit the scope of this disclosure. In some embodiments, the RFF may be located outside the electronic device 100. The RFF is not limited to a connector. In some embodiments, the RFF may be a base station, a radio device, or a wireless transmitter.

[0023] Antenna 220 is positioned outside the interference distance of the radio frequency interference source rfo. Thus, unlike antenna 210, antenna 220 is not affected or is almost unaffected by the radio frequency interference source rfo, and therefore can serve as an auxiliary antenna for receiving the interfered frequency band. In some embodiments, antenna 220 is positioned in space 114. In other words, antennas 210 and 220 are located on two opposite sides of electronic device 100 separated by a length L. In some embodiments, antenna 220 is positioned in space 113. In other words, antennas 210 and 220 are located on two adjacent sides of electronic device 100, and as shown in Figure 1, when antenna 210 is located on the right side of electronic device 100, antenna 220 is closer to the upper left corner of electronic device 100 (conversely, when antenna 210 is located on the left side of electronic device 100, antenna 220 is closer to the upper right corner of electronic device 100). Therefore, the distance between antenna 220 and the radio frequency interference source rfo located in space 111 can be greater than the length L to avoid radio frequency interference.

[0024] The power divider 230 has an input port 231, an input port 232, and an output port 233. As shown in Figure 2, input port 231 is coupled to antenna 210 to receive an input signal S1 from antenna 210. Input port 232 is coupled to antenna 220 to receive an input signal S2 from antenna 220. Specifically, taking the reception of GPS signals as an example, antenna 210 receives the GPS signal and the noise RFno from the radio frequency interference source rfo, while antenna 220 receives the GPS signal but not the noise RFno. In some embodiments, antennas 210 and 220 also receive signals from other frequency bands.

[0025] For example, antennas 210 and 220 receive signals in the low-frequency band (L-band), mid-frequency band (M-band), high-frequency band (H-band), and / or ultra-high-frequency band (UH-band). The frequency range of L-band is 698~960MHz; the frequency range of M-band is 1427~960MHz; the frequency range of H-band is 1710~2690MHz; and the frequency range of UH-band is 3400~3600MHz, 3600~3800MHz, and 5150~5850MHz. The GPS frequency bands include the L1 band (1575.42±30.69MHz) and the L5 band (1176.60±1.023MHz).

[0026] Therefore, signal S1 includes a GPS signal and noise RFno, while signal S2 includes a GPS signal but does not include noise RFno. After antennas 210 and 220 receive signals S1 and S2, they transmit signals S1 and S2 to input ports 231 and 232, respectively. In this way, power divider 230 can combine signals S1 and S2 into a combined signal So and output the combined signal So to output port 233.

[0027] In some methods, input ports 231 and 232 are used to output signals, while output port 233 is used to input signals; this is referred to as the forward operation of the power divider 230. In the forward operation, the power divider 230 is used to split the energy of an input signal into two parts for output. However, in the above-disclosed embodiments, the configuration of the power divider 230 corresponds to the reverse operation, which is the opposite of the forward operation. In the reverse operation, the power divider 230 is used to combine the energy of the two signals for output. The power divider 230 in the reverse operation is also referred to as a power combiner.

[0028] Furthermore, in some embodiments, the power divider 230 may include input ports other than input ports 231 and 232. In other words, a multi-channel power divider other than a two-channel power divider, such as a three-channel, four-channel, or eight-channel power divider, is used as the power divider 230. The number of input ports of the power divider 230 can be determined according to usage requirements. For example, BDS has the advantage of SMS communication over GPS. If GPS positioning and SMS communication functions are to be used, in addition to the two antennas used to receive GPS signals, a third antenna needs to be added to the RF switching circuit 200 to receive BDS signals. Accordingly, the power divider 230 is a three-channel power divider.

[0029] The frequency divider unit 240 is coupled to the output port 233 of the power divider 230 to receive the integrated signal S1 and divide the integrated signal S1 to filter out the desired signal, such as a GPS signal. In some methods, the on-chip RF switching circuit has only a single antenna 210, which directly transmits the received signal S1 to the input terminal 240a of the frequency divider unit 240 for frequency division. In other words, the input terminal 240a of the frequency divider unit 240 serves as the sole entry point for the antenna signal.

[0030] However, as mentioned above, the RF switch circuit 200 disclosed herein can have two antenna signal inputs, namely the input ports 231 and 232 of the power divider 230, by introducing the power divider 230. Therefore, in addition to the antenna 210, a new antenna 220 can be provided in the RF switch circuit 200. Furthermore, the power divider 230 is coupled between the two antennas and the input terminal 240a of the frequency divider unit 240. Therefore, the signals S1 and S2 of the two antennas can be integrated into a combined signal So, and the combined signal So can also be fed into the input terminal 240a of the frequency divider unit 240 on the chip. In this way, without changing the chip specifications, as long as the newly added antenna 220 is outside the interference distance, the aforementioned RF interference problem can be solved, and the antenna 210 can still be used to receive other frequency bands besides the interfered frequency band.

[0031] Furthermore, in some embodiments, the frequency division unit 240 divides the integrated signal So into multiple signal components with different frequency bands, such as L-band, M-band, H-band, and UH-band. These signal components are included in the signal component Sc output from the output terminal 240b of the frequency division unit 240. In some embodiments, the frequency band of one of these signal components is a GNSS band, such as a GPS band. In some embodiments, the frequency band of one of these signal components is the GPS L1 band.

[0032] In detail, in some embodiments, the frequency division unit 240 includes a duplexer 241 and an extractor 242. The duplexer 241 and the extractor 242 are connected in series between the input terminal 240a and the output terminal 240b. As shown in Figure 2, one end of the duplexer 241 is coupled to the output port 233 of the power divider 230 at the input terminal 240a, while the other end of the duplexer 241 is coupled to the extractor 242. Furthermore, the duplexer 241 is used to receive the integrated signal So from the output port 233 and perform a first frequency division to separate the signal component Sm from the integrated signal So. In some embodiments, the duplexer 241 filters out the signal component with a UH-band, thus the remaining signal component Sm is transmitted to the extractor 242.

[0033] Furthermore, extractor 242 is used to receive signal component Sm and perform a second frequency division to separate signal component Sc from signal component Sm. In some embodiments, duplexer 241 filters out signal components having L-band, M-band, and H-band, so the remaining signal component Sc is transmitted to amplifier 250.

[0034] In other words, the frequency division performed by the frequency division unit 240, which includes a duplexer 241 and an extractor 242, includes a first frequency division and a second frequency division. In some embodiments, the first frequency division filters out the signal with the UH-band. The second frequency division then filters out the signal components with the L-band, M-band, and H-band. The remaining signal component Sc is then transmitted to the input of the amplifier 250. In some embodiments, the signal component Sc has the GPS L1 band.

[0035] Furthermore, in some embodiments, the RF switching circuit 200 further includes an amplifier 250. The amplifier 250 is coupled to the output terminal 240b of the frequency divider unit 240 to receive the signal component Sc. When the signal component Sc is not strong enough, the amplifier 250 is needed to amplify the signal component Sc to generate a sufficiently strong signal Sa. The type of amplifier 250 can be determined according to the application requirements. In some embodiments, as shown in Figure 2, the amplifier 250 is a low noise amplifier (LNA). Regarding the current problem of RF interference with GPS signals, using an LNA can avoid excessive noise after the GPS signal is amplified. In other words, when the signal component Sc output by the frequency divider unit 240 is a GNSS signal, such as a GPS signal, an LNA can be used as the amplifier 250 to minimize the impact of noise.

[0036] Furthermore, in some embodiments, the RF switching circuit 200 further includes a switching unit 260, an antenna 270, and a signal processing unit 280. As shown in Figure 2, the switching unit 260 is coupled to the output terminal 240b of the amplifier 250, the antenna 270, and the signal processing unit 280. The antenna 270 is used to output signal S3. In some embodiments, a frequency divider unit (not shown) different from the frequency divider unit 240 is coupled between the antenna 270 and the switching unit 260 to extract the signal component with a specific frequency band from signal S3 into the switching unit 260.

[0037] As shown in Figure 2, the switching unit 260 is used to receive signals Sa and S3. Specifically, in some embodiments, the switching unit 260 may be a single-pole double-throw (SPDT) switch. The receiving switching unit 260 switches to determine whether to transmit signal Sa or signal S3 to the signal processing unit 280. In some embodiments, the switching unit 260 connects the amplifier 250 and the signal processing unit 280. Accordingly, the switching unit 260 disconnects the antenna 270 from the signal processing unit 280. Therefore, signal Sa is transmitted to the signal processing unit 280. In some embodiments, the switching unit 260 connects the antenna 270 to the signal processing unit 280. Accordingly, the switching unit 260 disconnects the amplifier 250 from the signal processing unit 280. Therefore, signal S3 is transmitted to the signal processing unit 280.

[0038] In some embodiments, antenna 270 is an external antenna, while antennas 210 and 220 are internal antennas. An external antenna refers to a removable antenna located outside the electronic device 100. Conversely, an internal antenna refers to a clamp-on antenna located inside the electronic device 100. Since the internal antennas of mobile devices, such as mobile phones and tablets, are usually small and easily affected by the surrounding environment, an external antenna is needed as a backup antenna to maintain signal strength and stability. Under the configuration of the aforementioned switching unit 260, when the internal antennas 210 and 220 receive signals well, the signals continue to be received using the internal antennas 210 and 220; when the internal antennas 210 and 220 receive signals poorly, the signals can be received by the external antenna 270.

[0039] Furthermore, the signal processing unit 280 is used to process the signal Sa or signal S3 from the switching unit 260. The signal processing may include extracting, analyzing, or performing calculations on the signal.

[0040] In some embodiments, amplifier 250, switching unit 260, antenna 270 may be omitted, and frequency division unit 240 may be directly coupled to signal processing unit 280. In other words, signal component Sc is directly transmitted to signal processing unit 280. This configuration is suitable when signal component Sc is strong enough.

[0041] In some embodiments, the RF switching circuit 200 further includes a signal processing unit 290 and a switching unit 260 including switching elements 261 and 262. In some embodiments, the signal processing unit 290 and the signal processing unit 280 are used to perform different signal processing. For example, the signal processing unit 280 is used to extract signals, and the signal processing unit 280 is used to perform calculations on the signals. In some embodiments, the signal processing unit 290 and the signal processing unit 280 are used to perform signal processing for signals in different frequency bands. For example, the signal processing unit 280 is used to perform signal processing for signals in the GPS L1 band, and the signal processing unit 290 is used to perform signal processing for signals in the GPS L5 band.

[0042] Furthermore, as shown in Figure 2, switching elements 261 and 262 are connected in series between the output of amplifier 250 and node n. Specifically, switching element 261 is coupled to amplifier 250 and antenna 270. Switching element 262 is coupled to signal processing unit 280 and signal processing unit 290 at node n. In other words, switching unit 260 is coupled to amplifier 250 and antenna 270 via switching element 261, and to signal processing unit 280 and signal processing unit 290 via switching element 262. In some embodiments, each of switching elements 261 and 262 may be implemented using an SPDT.

[0043] Switching element 261 switches to determine whether to process signal Sa or signal S3. In some embodiments, switching element 261 connects amplifier 250 and switching element 262. Correspondingly, switching element 261 disconnects antenna 270 and switching element 262. Therefore, signal Sa is transmitted to switching element 262. In some embodiments, switching element 261 connects antenna 270 and switching element 262. Correspondingly, switching element 261 disconnects amplifier 250 and switching element 262. Therefore, signal S3 is transmitted to switching element 262.

[0044] Switching element 262 switches to determine whether to use signal processing unit 280 or signal processing unit 290 for signal processing. In some embodiments, switching element 262 connects switching element 261 and signal processing unit 280. Correspondingly, switching element 262 disconnects switching element 261 from signal processing unit 290. Therefore, switching element 262 transmits signal Sa or signal S3 from switching element 261 to signal processing unit 280 for signal processing. In some embodiments, switching element 262 connects switching element 261 and signal processing unit 290. Correspondingly, switching element 262 disconnects switching element 261 from signal processing unit 280. Therefore, switching element 262 transmits signal Sa or signal S3 from switching element 261 to signal processing unit 290 for signal processing.

[0045] Please refer to Figures 2, 3, and 4 together. Figure 3 is a flowchart of a method 300 for operating an RF switch circuit 200 according to some embodiments of this disclosure. Figure 4 is a flowchart of operation 340 in Figure 3 according to some embodiments of this disclosure. It should be understood that additional operations may be provided before, during, and after the process shown in Figure 3, and some operations described below may be substituted or eliminated for additional embodiments of the method. The order of operations / processes may be interchangeable. In the various figures and illustrative embodiments, the same reference numerals are used to denote the same elements. Method 300 includes the following operations 310, 320, 330, 340, and 350 with reference to Figure 3.

[0046] In operation 310, the size of the power divider 230 is determined based on the internal space of the electronic device 100 in which the RF switch circuit 200 is installed. Specifically, an external power divider is first used for experimentation to confirm that the preset configuration of the RF switch circuit 200, such as the position of the antenna 220, yields good signal reception. Then, a power divider 230 is manufactured to fit into the electronic device 100 based on its internal space. This avoids cost waste due to the preset configuration not meeting expectations. Furthermore, the criteria for determining whether the preset configuration of the RF switch circuit 200 yields good signal reception may include, but are not limited to, return loss, insertion loss, and isolation.

[0047] In operation 320, the antennas 210 and 220 receive input signals S1 and S2, and transmit the input signals S1 and S2 to the input ports 231 and 232 of the power divider 230, respectively. Furthermore, the input signals S1 and / or S2 do not contain noise from the radio frequency interference source (rfo).

[0048] In operation 330, the power divider 230 further combines the input signals S1 and S2 into an integrated signal So, and outputs the integrated signal So to the frequency divider unit 240.

[0049] In operation 340, the frequency division unit 240 further divides the integrated signal So into multiple signal components with different frequency bands, such as L-band, M-band, H-band, and UH-band. In some embodiments, operation 340 includes sub-operations 341 and 342.

[0050] As shown in Figure 4, in operation 341, the duplexer 241 divides the integrated signal So into a first signal component group containing signal component Sm. In some embodiments, the first signal component group further includes a signal component having a UH-band. In operation 342, the extractor 242 further divides the signal component Sm into a second signal component group containing signal component Sc. In some embodiments, the second signal component group further includes signal components having an L-band, an M-band, and an H-band.

[0051] In operation 350, signal processing unit 280 performs signal processing on a signal associated with one of these signal components, signal component Sc. Specifically, this signal is the signal transmitted to node n. In some embodiments, this signal is an amplified signal of signal component Sc amplified by amplifier 250. In some embodiments, amplifier 250, switching unit 260, and antenna 270 are omitted, and this signal can be signal component Sc. In other words, this signal contains signal component Sc.

[0052] In summary, by adding an antenna outside the interference distance, the radio frequency interference circuit 200 and its operation method 300 disclosed herein solve the aforementioned radio frequency interference problem due to chip specification limitations.

[0053] Although the present disclosure has been disclosed above with reference to embodiments, it is not intended to limit the present disclosure. Any person with ordinary knowledge in the art may make various modifications and alterations without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the appended claims. [Simplified Explanation of the Diagram]

[0008] To make the above and other objects, features, advantages and embodiments of this disclosure more apparent and understandable, the accompanying drawings are described below: Figure 1 is a schematic diagram of an electronic device according to some embodiments of this disclosure. Figure 2 is a schematic diagram of a radio frequency switch circuit according to some embodiments of this disclosure. Figure 3 is a flowchart of a method for operating the radio frequency switch circuit according to some embodiments of this disclosure. Figure 4 is a flowchart of further details of operation 340 in Figure 3 according to some embodiments of this disclosure. [Biomaterial Storage]

[0055] Domestic storage information (please note in order of storage institution, date, and number): None. International storage information (please note in order of storage country, institution, date, and number): None.

Claims

1. A radio frequency (RF) switch circuit, comprising: a first antenna adjacent to and subject to RF interference from a radio frequency interference source; a second antenna disposed at an interference distance from the RF interference source and not subject to interference from the RF interference source; a power divider having a first input port and a second input port coupled to the first antenna and the second antenna, respectively; and a frequency divider unit coupled to an output port of the power divider.

2. The radio frequency switch circuit as claimed in claim 1, wherein the interference distance is less than the length of an electronic device in which the radio frequency switch circuit is disposed.

3. The radio frequency switching circuit as claimed in claim 2, wherein the first antenna and the second antenna are located on two opposite sides of the electronic device separated by the length.

4. The radio frequency switch circuit as claimed in claim 2, wherein the first antenna and the second antenna are located on two adjacent sides of the electronic device, and the distance between the second antenna and the radio frequency interference source is greater than the length.

5. The radio frequency switch circuit as claimed in claim 2, wherein the radio frequency interference source is a connector of the electronic device, and the interference distance is determined according to the type of the connector.

6. The radio frequency switching circuit as claimed in claim 1, wherein the interference distance is less than 20 cm.

7. The radio frequency switching circuit of claim 1, wherein the frequency divider unit is used to divide an integrated signal from the output port into a plurality of signal components having different frequency bands, and one of the signal components has a global navigation system frequency band.

8. The radio frequency switching circuit of claim 1, wherein the frequency divider unit comprises: a duplexer coupled to the output port of the power divider for receiving an integrated signal from the output port and performing a first frequency division to separate a first signal component from the integrated signal; and an extractor coupled to the duplexer for receiving the first signal component and performing a second frequency division to separate a second signal component from the first signal component.

9. The radio frequency switching circuit of claim 1, wherein the frequency divider unit is used to divide an integrated signal from the output port into a plurality of signal components, and wherein the radio frequency switching circuit further includes: an amplifier coupled to the frequency divider unit for receiving and amplifying one of the signal components to generate a first signal.

10. The radio frequency switching circuit of claim 9, wherein the signal component of the signal components has a global navigation system frequency band, and the amplifier is a low noise amplifier.

11. The radio frequency switching circuit of claim 9 further comprises: a switching unit coupled to the amplifier; a third antenna coupled to the switching unit for outputting a second signal, wherein the third antenna is an external antenna and the first antenna and the second antenna are internal antennas; and a first signal processing unit coupled to the switching unit for signal processing of the first signal or the second signal from the switching unit, wherein the switching unit switches to determine whether to transmit the first signal or the second signal to the first signal processing unit.

12. The radio frequency switching circuit of claim 11 further comprises: a second signal processing unit, the second signal processing unit and the first signal processing unit performing signal processing for signals in different frequency bands, wherein the switching unit includes a first switching element and a second switching element, wherein the switching unit is coupled to the amplifier and the third antenna via the first switching element, and coupled to the first signal processing unit and the second signal processing unit via the second switching element, wherein the first switching element switches to determine whether to perform signal processing on the first signal or the second signal, and the second switching element switches to determine whether to use the first signal processing unit or the second signal processing unit for signal processing.

13. A method of operating a radio frequency switching circuit, comprising: receiving a plurality of input signals by a plurality of antennas and transmitting the input signals to a plurality of input ports of a power divider, wherein at least one of the input signals does not contain noise from a radio frequency interference source; further combining the input signals into an integrated signal by the power divider and outputting the integrated signal to a frequency divider unit; and further dividing the integrated signal into a plurality of signal components with different frequency bands by the frequency divider unit.

14. The method of claim 13 further comprises: determining the size of the power divider based on the internal space of an electronic device in which the radio frequency switching circuit is configured.

15. The method of claim 13, wherein further dividing the integrated signal into the plurality of signal components having different frequency bands by the frequency divider unit comprises: dividing the integrated signal into a first signal component group including a first signal component by a duplexer; and further dividing the first signal component into a second signal component group including a second signal component by an extractor.

16. The method of claim 13 further comprises: performing signal processing on a signal associated with a signal component of the signal components by a signal processing unit, wherein the signal includes the signal component.

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