CN207588838U - A kind of antenna rf circuit and radio-frequency unit - Google Patents
A kind of antenna rf circuit and radio-frequency unit Download PDFInfo
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- CN207588838U CN207588838U CN201721696259.XU CN201721696259U CN207588838U CN 207588838 U CN207588838 U CN 207588838U CN 201721696259 U CN201721696259 U CN 201721696259U CN 207588838 U CN207588838 U CN 207588838U
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Abstract
The utility model discloses a kind of antenna rf circuit, including：Multiple radio frequency branch ends；One radio frequency common end；The a plurality of radio frequency branch being respectively arranged between each radio frequency branch end and radio frequency common end；Lotus root is connected to the radio frequency branch switch combination between the multiple radio frequency branch end and the radio frequency common end；Lotus root is connected to the earthing switch combination between the multiple radio frequency branch end and ground terminal；Wherein：The radio frequency branch switch combination is controlled to enter a kind of RF switch assembled state, so that radio frequency common end is connected with a radio frequency branch end, radio frequency common end and remaining radio frequency branch end disconnect, synchronous, the earthing switch combination is controlled to enter a kind of earthing switch assembled state so that the radio frequency branch end and ground terminal connected with the radio frequency branch end that radio frequency common end disconnects with ground terminal, connected with radio frequency common end disconnects.The utility model sets earthing switch to improve the isolation between radio frequency branch to reduce the shutdown capacitance of radio frequency branch on radio frequency branch road.
Description
Technical field
The present invention relates to radio communication field, more particularly to a kind of antenna rf circuit and radio-frequency unit.
Background technology
With the rapid development of smart mobile phone technology, a mobile phone may have seven or eight even more antennas, averagely arrive
The installation space of each antenna is less and less.In addition, as 4G technologies develop, communication work frequency range increases, how narrow
Designed in space becomes to become increasingly complex with wide, efficient antenna for mobile phone.Antenna tuning switch efficiently solves
State problem.
When antenna tuning switch is closed, possess low conducting resistance (RON)；When antenna tuning switch disconnects, possess low
Shutdown capacitance (COFF) and high breakdown voltage (BV).Above-mentioned characteristic so that antenna tuning switch, which disclosure satisfy that, is inserted into damage
Three requirements of consumption, high-isolation and firing frequency proof voltage.Antenna tuning switch is operated in the near field induced electricity in antenna for mobile phone
When in pressure ring border, Q value of the antenna for mobile phone in tuning frequency range can be improved so that antenna for mobile phone is in the efficiency and band of frequency modulation frequency range
Width gets a promotion, so as to meet 4G cell phone communication to the total radiant powers (TRP) of multiple frequency ranges and total omnidirectional sensitivity (TIS)
It is required that.
At this stage, most of antenna tuning switch is prepared by silicon on RF isolation (RF SOI) technique.Such antenna
Tuning switch, the Low Medium Frequency insertion loss (L/MB Insertion Loss) that the conducting resistance (Ron) on conducting branches introduces
Q value of the antenna in nonresonant frequency range can be reduced；It turns off the parasitic shutdown capacitance (C in branch roadOFF) introduce medium-high frequency Insertion Loss
(M/HB Insertion Loss) can then reduce the isolation of full frequency band.Therefore, in order to ensure the high resonant Q value needed for antenna,
Need to reduce the conducting resistance (Ron) on its conducting branches and its shutdown capacitance (C of shutdown branch roadOFF), it is closed in addition, reducing
Shutdown capacitance (the C of disconnected branch roadOFF), additionally it is possible to the isolation between the different branch of antenna is promoted, so as to reduce different frequency range
Between interference.Conducting resistance (Ron) and shutdown capacitance (COFF) product it is smaller, it is meant that the transmitting-receiving effect of antenna is better.
At present, in order to reduce the conducting resistance of antenna (Ron), shutdown capacitance (COFF), main path in the art is excellent
Change semiconductor design and preparation process, so as to find optimal or half-way house.
The present inventor has found in long-term production practices, reduces the shutdown capacitance (C of antennaOFF), in addition to optimization
Except semiconductor technology, it can also be designed and be realized by circuit topology.
Invention content
For above-mentioned technical problem, one aspect of the present invention proposes a kind of antenna rf circuit, and specific technical solution is such as
Under：
A kind of antenna rf circuit, including：
Multiple radio frequency branch ends；
One radio frequency common end；
The a plurality of radio frequency branch being respectively arranged between each radio frequency branch end and the radio frequency common end；
Lotus root is connected to the radio frequency branch combinations switch between the multiple radio frequency branch end and the radio frequency common end；It is connect with lotus root
Earthing switch combination between the multiple radio frequency branch end and ground terminal；
Wherein：The radio frequency branch switch combination is controlled to enter a kind of RF switch assembled state so that described to penetrate
Frequency common end is connected with a radio frequency branch end, the radio frequency common end and remaining radio frequency branch end disconnect, synchronous, it is described to connect
Ground switch combination is controlled to enter a kind of earthing switch assembled state so that the radio frequency branch disconnected with the radio frequency common end
End is connected with ground terminal, the radio frequency branch end that is connected with the radio frequency common end and ground terminal disconnection.
Further, radio frequency branch switch combination is included there are many RF switch assembled state, different a variety of
RF switch assembled state, the radio frequency branch end for being communicated to the radio frequency common end are different.
Further, earthing switch combination includes that there are many RF switch assembled states, is opened in different a variety of ground connection
Assembled state is closed, it is different from the radio frequency branch end that ground terminal disconnects.
Further, the radio frequency branch switch combination includes multiple radio frequency branch switch, every radio frequency branch road
There are one the radio frequency branch switch for coupling.
Further, the radio frequency branch switch is combined as a single pole multiple throw.
Another aspect of the present invention provides a kind of antenna rf device, and specific technical solution is as follows：
A kind of antenna rf device, including：
RF signal transmitter；
Antenna rf circuit and antenna, the antenna rf circuit include：Multiple radio frequency branch ends；One radio frequency is public
End；The a plurality of radio frequency branch being respectively arranged between each radio frequency branch end and the radio frequency common end；Lotus root is connected to the multiple
Radio frequency branch combinations between radio frequency branch end and the radio frequency common end；The multiple radio frequency branch end and ground connection are connected to lotus root
Earthing switch combination between end；Wherein：The radio frequency branch switch combination is controlled to enter a kind of RF switch combination shape
State so that, the radio frequency common end is connected with a radio frequency branch end, the radio frequency common end and remaining radio frequency branch end are broken
It opens, synchronous, the earthing switch combination is controlled to enter a kind of earthing switch assembled state so that public with the radio frequency
The radio frequency branch end and ground terminal for the radio frequency branch end disconnected is held to be connected with ground terminal, connecting with the radio frequency common end disconnect；
Antenna；
The signal transmitting terminal of the RF signal transmitter connects each radio frequency branch of the antenna rf circuit respectively
Terminal, the radio frequency common end of the antenna rf circuit connect the signal receiving end of the antenna.
Compared with prior art, it is of the invention by setting radio frequency earthing switch on every radio frequency branch road of antenna, so as to
Shutdown capacitance (the C of each radio frequency branch road is greatly reducedOFF), it finally improves the isolation between different branch, reduce
Interference between different frequency range.
Description of the drawings
Fig. 1 is the schematic diagram of antenna rf circuit provided by the invention in a specific embodiment；
Fig. 2 is the schematic diagram of antenna rf device provided by the invention in a specific embodiment.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the schematic diagram of antenna rf circuit 200 provided by the invention in a specific embodiment.Refer to Fig. 1 institutes
Show, the antenna rf circuit 200 is including there are four radio frequency branch end and a radio frequency common end RFC, four radio frequency branch ends
Respectively the first radio frequency branch end RF1, the second radio frequency branch end RF2, third radio frequency branch end RF3 and the 4th radio frequency branch end
RF4。
The first radio frequency branch end RF1, the second radio frequency branch end RF2, the third radio frequency branch end RF3 and institute
State be respectively equipped between the 4th radio frequency branch end RF4 and the radio frequency common end RFC the first radio frequency branch, the second radio frequency branch,
Third radio frequency branch and the 4th radio frequency branch.
Through the first radio frequency branch, the second radio frequency branch, the third radio frequency branch and the 4th radio frequency branch
Road, the antenna rf circuit 200 in the present embodiment can realize the transmission of the radiofrequency signal to four kinds of different frequency ranges.Certainly, exist
In other embodiment, can according to the quantity of the radiofrequency signal of the different frequency range of required transmission, be correspondingly arranged two, three or
The radio frequency branch end of other numbers so as to be correspondingly formed the radio frequency branch of two, three or other numbers, realizes two kinds, three kinds
Or the tuning of the radiofrequency signal of the different frequency range of other numbers.
In the present embodiment, the first radio frequency branch road lotus root is connected to one first radio frequency branch switch SW1, first radio frequency
One first earthing switch SWsh1 is coupled between branch end RF1 and ground terminal.Lotus root is connected to one second for the second radio frequency branch road
Radio frequency branch switch SW2, is coupled with one second earthing switch SWsh2 between the second radio frequency branch end RF2 and ground terminal.Institute
It states third radio frequency branch road lotus root and is connected to a third radio frequency branch switch SW3, between the third radio frequency branch end RF3 and ground terminal
It is coupled with a third earthing switch SWsh3.The 4th radio frequency branch road lotus root is connected to one the 4th radio frequency branch switch SW4, described
One the 4th earthing switch SWsh4 is coupled between 4th radio frequency branch end RF4 and ground terminal.
The first radio frequency branch switch SW1, the second radio frequency branch switch SW2, the third radio frequency branch switch
SW3 and the four radio frequencies branch switch SW4 form a radio frequency branch switch combination, the first earthing switch SWsh1, described
Second earthing switch SWsh2, the third earthing switch SWsh3 and the 4th earthing switch SWsh4 then form a ground connection
Switch combination.Wherein：
The radio frequency branch switch combination includes four kinds of RF switch assembled states, in different RF switch assembled states
Under, the radio frequency branch end for being communicated to the radio frequency common end RFC is different.The earthing switch combination is also opened including four kinds of ground connection
Assembled state is closed, it is different from the radio frequency branch end that ground terminal disconnects under different earthing switch assembled states.Specifically：
When radio frequency branch switch combination is controlled enters a kind of RF switch assembled state, the radio frequency is public
End RFC is connected with a corresponding radio frequency branch end and (is realized by the radio frequency branch switch for being closed corresponding radio frequency branch road),
The radio frequency common end RFC is disconnected with its excess-three radio frequency branch end (by the radio frequency branch for disconnecting corresponding radio frequency branch road
Way switch is realized).Synchronously, the earthing switch combination is controlled enters a kind of corresponding earthing switch assembled state, makes
It obtains (real by being closed corresponding earthing switch with the radio frequency branch end that the radio frequency common end RFC is disconnected with ground terminal connection
Now), it disconnects and (being realized by disconnecting corresponding earthing switch) with the radio frequency branch end of radio frequency common end connection and ground terminal.
In the present embodiment, the first radio frequency branch switch SW1, the second radio frequency branch switch SW1, the third are penetrated
Frequency branch switch SW3 and the 4th radio frequency branch switch SW4 is in closed state there are one being at a time only capable of.Accordingly
, the first radio frequency branch, the second radio frequency branch, the third radio frequency branch and the 4th radio frequency branch are a certain
Moment only have one it is in the conduction state, so as to fulfill the transmission of the radiofrequency signal to four kinds of different frequency ranges.
Know as known to one skilled in the art, in other embodiments, can also be opened using a hilted broadsword four-throw
(SP4T) is closed to realize the switching logic of the RF switch combination, by controlling the moved end of four throw switch of hilted broadsword (SP4T),
Realize leading for the first radio frequency branch, the second radio frequency branch, the third radio frequency branch or the 4th radio frequency branch
It is logical, so as to fulfill the transmission to four kinds of radiofrequency signals to different frequency range.
Since the present invention patrols the radio frequency branch switch of every radio frequency branch road with closure/disconnection of corresponding earthing switch
It collects and is reversed, so as to effectively reduce the shutdown capacitance (C of each radio frequency branch roadOFF), improve different penetrate
Isolation between frequency branch finally reduces the interference between the radiofrequency signal of different frequency range.
By taking the first radio frequency branch in the present embodiment as an example, when the first radio frequency branch switch SW1 is disconnected, institute
The first earthing switch SWsh1 closures are stated, so that the residual radiofrequency signal of the first radio frequency branch road can be through described the
One earthing switch SWsh1 flows into the earth, eventually reduces the shutdown capacitance (COFF) at the first radio frequency branch switch SW1 both ends.
Fig. 2 is in an embodiment, and antenna rf device provided by the invention, the antenna rf device includes radiofrequency signal
Transmitter 100, antenna rf circuit 200 and antenna 300.The antenna rf circuit 200 is that the above antenna is penetrated
Frequency circuit.
What the signal transmitting terminal of the RF signal transmitter 100 connected the antenna rf circuit 200 respectively first penetrates
Frequency branch end RF1, the second radio frequency branch end RF2, third radio frequency branch end RF3 and the 4th radio frequency branch end RF4, the antenna are penetrated
The radio frequency common end RFC connections antenna 300 of frequency circuit 200.
In the present embodiment, the frequency range packet 850MHz, 900MHz for the radiofrequency signal that the RF signal transmitter 100 emits,
Four frequency ranges such as 1800MHz and 1900MHz.
The antenna 300 is a kind of converter, can be converted into the guided wave propagated on transmission line (logical in unbounded media
Often free space) in transmit electromagnetic wave or carry out vice versa.
In the present embodiment, the first radio frequency branch of the antenna rf circuit 200, the second radio frequency branch, third radio frequency branch
Road and the 4th radio frequency branch are respectively by 850MHz frequency band signals, 900MHz frequency band signals, 1800MHz frequency band signals and 1900MHz
Frequency band signals are transmitted to the antenna 300, are finally launched signal by the antenna 300.
As described above, due to the radio frequency branch switch of each radio frequency branch road of the antenna rf circuit and connecing
Closure/disconnection logic of ground switch is reversed, so as to improve the isolation of each radio frequency branch road.It is final to cause institute
Antenna rf device is stated in the transmission for carrying out radiofrequency signal, four road frequency band signals 850MHz/900MHz/1800MHz/
Interference between 1900MHz is relatively low.
The description with certain particularity detailed enough has been carried out to the present invention above.Ordinary skill in fields
Personnel are it should be understood that the description in embodiment is only exemplary, before without departing from true spirit and scope of the present invention
Put make it is all change should all belong to the scope of protection of the present invention.Scope of the present invention is by the power
It is that sharp claim is defined rather than limited by the foregoing description in embodiment.
Claims (6)
1. a kind of antenna rf circuit, which is characterized in that it includes：
Multiple radio frequency branch ends；
One radio frequency common end；
The a plurality of radio frequency branch being respectively arranged between each radio frequency branch end and the radio frequency common end；
Lotus root is connected to the radio frequency branch switch combination between the multiple radio frequency branch end and the radio frequency common end；Institute is connected to lotus root
State the earthing switch combination between multiple radio frequency branch ends and ground terminal；
Wherein：The radio frequency branch switch combination is controlled to enter a kind of RF switch assembled state so that the radio frequency is public
End is connected with a radio frequency branch end altogether, the radio frequency common end and remaining radio frequency branch end disconnect, synchronous, the ground connection is opened
Close combination it is controlled enter a kind of earthing switch assembled state so that with the radio frequency common end disconnect radio frequency branch end with
Ground terminal connection, the radio frequency branch end connected with the radio frequency common end and ground terminal disconnect.
2. antenna rf circuit as described in claim 1, which is characterized in that there are many radio frequency branch switch combination includes
RF switch assembled state in different a variety of RF switch assembled states, is communicated to the radio frequency branch of the radio frequency common end
Terminal is different.
3. antenna rf circuit as described in claim 1, which is characterized in that the earthing switch combination is included opens there are many radio frequency
Assembled state is closed, it is different from the radio frequency branch end that ground terminal disconnects in different a variety of earthing switch assembled states.
4. antenna rf circuit as described in claim 1, which is characterized in that the radio frequency branch switch combination includes multiple penetrate
Frequency branch switch, there are one the radio frequency branch switch for coupling for every radio frequency branch road.
5. antenna rf circuit as described in claim 1, which is characterized in that it is more that the radio frequency branch switch is combined as a hilted broadsword
Throw switch.
6. a kind of antenna rf device, which is characterized in that it includes：
RF signal transmitter；
Antenna rf circuit, the antenna rf circuit are antenna rf circuit described in claim 1；
Antenna；
The signal transmitting terminal of the RF signal transmitter connects each radio frequency branch end of the antenna rf circuit respectively,
The radio frequency common end of the antenna rf circuit connects the signal receiving end of the antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721696259.XU CN207588838U (en) | 2017-12-08 | 2017-12-08 | A kind of antenna rf circuit and radio-frequency unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721696259.XU CN207588838U (en) | 2017-12-08 | 2017-12-08 | A kind of antenna rf circuit and radio-frequency unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207588838U true CN207588838U (en) | 2018-07-06 |
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ID=62736269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721696259.XU Active CN207588838U (en) | 2017-12-08 | 2017-12-08 | A kind of antenna rf circuit and radio-frequency unit |
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| CN (1) | CN207588838U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289883A (en) * | 2019-07-31 | 2019-09-27 | 维沃移动通信有限公司 | A kind of radio circuit, terminal device and circuit control method |
| CN111082816A (en) * | 2019-12-20 | 2020-04-28 | 东莞宇龙通信科技有限公司 | Radio frequency front-end circuit and terminal |
-
2017
- 2017-12-08 CN CN201721696259.XU patent/CN207588838U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289883A (en) * | 2019-07-31 | 2019-09-27 | 维沃移动通信有限公司 | A kind of radio circuit, terminal device and circuit control method |
| CN110289883B (en) * | 2019-07-31 | 2021-09-28 | 维沃移动通信有限公司 | Radio frequency circuit, terminal equipment and circuit control method |
| CN111082816A (en) * | 2019-12-20 | 2020-04-28 | 东莞宇龙通信科技有限公司 | Radio frequency front-end circuit and terminal |
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