CN210274079U

CN210274079U - Miniaturized multifrequency section LTE 4G antenna

Info

Publication number: CN210274079U
Application number: CN201921792402.4U
Authority: CN
Inventors: 梁伟其; 徐培文
Original assignee: Shenzhen Duowei Communication Technology Co Ltd
Current assignee: Shenzhen Duowei Zhilian Technology Co.,Ltd.
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-04-07
Anticipated expiration: 2029-10-23

Abstract

The utility model discloses a miniaturized multifrequency section LTE 4G antenna, including the radio frequency transceiver, power amplifier, first switch, second switch, main collection module, diversity module, main collection antenna and the diversity antenna that connect gradually, the diversity antenna includes the diversity submodule piece that the resistance capacitance inductance filtering matching circuit of a plurality of pi types or L types is constituteed, and resistance capacitance inductance filtering matching circuit is parallelly connected to form by 0.1uF nonpolar electric capacity and 10uF electrolytic capacitor. The diversity sub-module replaces a diversity filter by the filtering effect of the resistance-capacitance-inductance filtering matching circuit, so that the installation space is saved; a DPDT double-pole double-throw change-over switch is arranged between the diversity submodule and the main set module, so that the main set module and the diversity module can be flexibly switched to be communicated with the diversity antenna and the main set antenna internal circuit in the same working frequency band, and the wiring space of a circuit transmission line is saved. The antenna can support multiple frequency bands of FDD B1/4, B13/20/28, B5/8/12/17/18/19/26, B7, B2/3/34/39/25 and TDD B38/40/41, the frequency band range covers 1700-1900 MHz, and the effect of global communication is achieved.

Description

Miniaturized multifrequency section LTE 4G antenna

Technical Field

The utility model relates to the field of communication technology, in particular to miniaturized multifrequency section LTE 4G antenna.

Background

With the continuous development of communication technology, various mobile terminal devices with communication functions are in a wide range, which brings great convenience to daily communication of people. The fourth generation mobile communication technology is widely applied to mobile terminals because of its ultra-high data transmission speed, and includes two systems, TD-LTE and FDD-LTE. Generally, a main set of the LTE 4G antenna is connected with a plurality of diversity sets with different frequency bands, each diversity set is provided with a diversity filter, the diversity filters separate useful signals from noise, the anti-interference performance and the noise-to-performance ratio of the signals are improved, meanwhile, useless frequency components are filtered, the analysis precision is improved, and the purposes of improving the data transmission capacity and the signal receiving sensitivity of the LTE 4G antenna are achieved. The diversity filters are intensively arranged on the mobile phone mainboard, and the mobile phone mainboard has limited space, is easy to reduce the diversity performance and has high application cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides a miniaturized multifrequency section LTE 4G antenna aims at optimizing the connected mode of LTE 4G antenna owner collection and diversity on the mobile phone motherboard, under the stable circumstances of assurance signal reception, reduces mainboard owner collection module and diversity module and walks the line space.

In order to achieve the above object, the utility model provides a miniaturized multifrequency section LTE 4G antenna, including the radio frequency transceiver and the power amplifier that connect gradually, still including the change over switch that is used for switching over the signal trend, and with main collection module, diversity module, main collection antenna and the diversity antenna that change over switch connects.

The switch comprises a first switch and a second switch which are connected with each other, the power amplifier is connected with the main set module through the first switch, the second switch comprises a first port and a second port which are fixed and unchangeable, and a third port and a fourth port which are used for switching the connection direction of signals, the first port and the second port are respectively connected with the main set antenna and the diversity antenna, the third port is connected with the radio frequency signal input end of the main set module, the radio frequency signal output end of the main set module is connected with the first radio frequency signal input end of the radio frequency transceiver, the fourth port is connected with a diversity switch which is used for separating radio frequency signals in different ranges, the diversity module comprises a plurality of diversity sub-modules which are used for receiving the radio frequency signals in different ranges, and the radio frequency signal input end and the radio frequency signal output end of any one of the diversity sub-modules are respectively connected with the diversity switch, And the second radio-frequency signal input end of the radio-frequency transceiver is connected, and any diversity sub-module is a pi-type or L-type resistance-capacitance-inductance filtering matching circuit, wherein the resistance-capacitance-inductance filtering matching circuit is formed by connecting a 0.1uF nonpolar capacitor and a 10uF electrolytic capacitor in parallel.

Preferably, the second switch is a double-pole double-throw DPDT switch.

Preferably, the transmission line impedance of the main set module and any of the diversity sub-modules is 50 Ω.

Preferably, the LTE 4G antenna supports a frequency range of 1700-1900 MHz.

Compared with the prior art, the beneficial effects of the utility model are that: the diversity submodule realizes a filtering effect by adopting a pi-shaped or L-shaped resistance-capacitance-inductance filtering matching circuit, a DPDT double-pole double-throw change-over switch is arranged between the diversity submodule and the main set module, the main set module and the diversity module are conveniently and flexibly switched to be connected with a diversity antenna and a main set antenna in the same working frequency band, and a diversity filter is cancelled to save the installation space. The antenna can support multiple frequency bands of FDD B1/4, B13/20/28, B5/8/12/17/18/19/26, B7, B2/3/34/39/25 and TDD B38/40/41, the frequency band range covers 1700-1900 MHz, and the effect of global communication is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a block diagram of a miniaturized multi-band LTE 4G antenna of the present invention;

FIG. 2 is a schematic diagram of a main integrated module circuit according to the present invention;

fig. 3 is a schematic diagram of a first switching circuit of the present invention;

fig. 4 is a schematic diagram of a second switching circuit of the present invention;

fig. 5 is a schematic diagram of the diversity switch circuit of the present invention;

fig. 6 is a schematic circuit diagram of the FDD 1/4 frequency band diversity submodule of the present invention;

fig. 7 is a schematic circuit diagram of the frequency band diversity submodule of TDD 38/40/41 according to the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The utility model provides a miniaturized multifrequency section LTE 4G antenna, as shown in fig. 1, including radio frequency transceiver 1 and the power amplifier 2 that connects gradually, still including the change over switch that is used for switching over the signal trend, and with the owner collection module 4, the diversity module 8, the owner collection antenna 6 and the diversity antenna 7 that change over switch connects. The radio frequency transceiver 1 is connected to an external data connector, and is configured to receive a digital signal sent by the data connector and convert the digital signal into a radio frequency signal, and send the radio frequency signal to the power amplifier 2, or receive a radio frequency signal sent by the main set module 4 and the diversity module 8 and convert the radio frequency signal into a digital signal, and send the digital signal to the data connector.

The switch includes a first switch 31 and a second switch 32 connected to each other, the power amplifier 2 is connected to the main set module 4 through the first switch 31, the second switch 32 includes a first port and a second port that are fixed and unchangeable, and a third port and a fourth port for switching signal connection direction, the first port and the second port are respectively connected to the main set antenna 6 and the diversity antenna 7, the third port is connected to the radio frequency signal input end of the main set module 4, the radio frequency signal output end of the main set module 4 is connected to the first radio frequency signal input end of the radio frequency transceiver 1, the fourth port is connected to a diversity switch 5 for separating radio frequency signals in different ranges, the diversity module 8 includes a plurality of diversity sub-modules for receiving radio frequency signals in different ranges, and any one of the radio frequency signal input ends of the diversity sub-modules is connected to the main set module 4, The output end of the power supply is respectively connected with the diversity switch 5 and the second radio frequency signal input end of the radio frequency transceiver 1, and any diversity submodule is a pi-shaped or L-shaped resistance-capacitance-inductance filtering matching circuit, wherein the resistance-capacitance-inductance filtering matching circuit is formed by connecting a 0.1uF nonpolar capacitor and a 10uF electrolytic capacitor in parallel.

Specifically, the second switch 32 is a double-pole double-throw DPDT switch.

When transmitting signals, the power amplifier 2 receives radio-frequency signals sent by the radio-frequency transceiver 1, amplifies the power of the radio-frequency signals and transmits the amplified radio-frequency signals to the first switch 31, the first switch 31 switches internal connection points to be conducted with corresponding frequency bands inside the master set module 4, the radio-frequency signals are sent to the master set module 4, then enter through the third port of the second switch 32 and are sent out through the first port, and finally the radio-frequency signals are sent out from the master set antenna 6 to finish signal transmission. When receiving signals, the diversity antenna 7 assists the main set antenna 6 to receive radio frequency signals, the main set antenna 6 and the diversity antenna 7 respectively enter the second switch 32 through the first port and the second port, the second switch 32 switches the internal connection point, so that the input end of the main set module 4 is connected with the output end of the diversity antenna 7, the input end of the diversity module 8 is connected with the output end of the main set antenna 6, the connection paths of the main set module 4 and the diversity module 8 with the diversity antenna 7 and the main set antenna 6 are conveniently switched, the main set module 4 is connected with the diversity antenna 7 in the same working frequency band, the diversity module 8 is connected with the main set antenna 6 in the same working frequency band, and flexible switching is realized.

Generally, each frequency band of the LTE 4G antenna needs to be connected with a corresponding diversity filter, and a switch corresponding to the diversity filter needs to switch each frequency band. The utility model discloses the resistance capacitance inductance filter matching circuit of pi type or L type is chooseed for use to the diversity submodule piece, and the filter is realized to the direct current resistance big, alternating current frequency with the characteristics that the higher impedance is more small, the filtering mixes the alternating current in the direct current. After filtering, alternating current returns to a power supply through the capacitor, pure direct current without fluctuation is left on two sides of the capacitor, and based on the same principle, alternating current signals can be screened out by the capacitor, direct current components are filtered out, and the antenna is fed by coupling. Generally, the electrolytic capacitor has large parasitic inductance and poor high-frequency ripple elimination capability, the non-polar capacitor has small parasitic inductance and good high-frequency ripple filtering capability, the embodiment uses a mode of connecting the 0.1uF non-polar capacitor and the 10uF electrolytic capacitor in parallel to reduce the impedance between a power line and a ground line, and filters the ripple generated by the current change of a nearby chip, so that other chips are not influenced, the filtering effect is further optimized, a low-pass, band-pass and high-pass filtering circuit is combined, the external frequency band and the electromagnetic interference are effectively inhibited, a diversity filter is not needed, the data and the received signal can be stably transmitted, and the space is saved.

The utility model discloses, LTE 4G antenna supports FDD B1/4, B13/20/28, B5/8/12/17/18/19/26, B7, B2/3/34/39/25, TDD B38/40/41 a plurality of frequency channels, and the frequency channel scope is 1700 ~ 1900MHz, and the frequency channel scope is wider, realizes the effect of global communication.

The chip model of the radio frequency transceiver 1 is MT6177, the chip model of the power amplifier 2 is AP7219M, as shown in fig. 2-5, the chip models are respectively a main set module 4, a first switch 31, a second switch 32, and a diversity switch 5 circuit schematic diagram, and each diversity sub-module and the main set module are connected with the radio frequency transceiver 1 through an RFIC interface. As shown in fig. 6 and 7, taking the schematic diagrams of FDD 1/4 and TDD 38/40/41 frequency band diversity sub-module circuits as examples, under the condition of ensuring the circuit routing specification of the main set module 4, it is required to optimize the impedance line to be as short as possible, and the ground coverage protection is good, and set the impedance of the transmission line of the main set module 4 and any one of the diversity sub-modules to be 50 Ω optimal, so as to reduce the electromagnetic interference and crosstalk near the circuit and improve the transmission efficiency. Meanwhile, under the condition of limited installation space, the line width design of the transmission line with the impedance of 50 omega is more flexible, and the applicability of the transmission line is further improved.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A miniaturized multiband LTE 4G antenna comprises a radio frequency transceiver and a power amplifier which are sequentially connected, and is characterized by further comprising a change-over switch used for changing over the trend of signals, and a main set module, a diversity module, a main set antenna and a diversity antenna which are connected with the change-over switch;

2. The miniaturized multiband LTE 4G antenna of claim 1, wherein the second switch is a double pole double throw DPDT switch.

3. The miniaturized multi-band LTE 4G antenna of claim 1, wherein the transmission line impedance of the main set module and any of the diversity sub-modules is 50 Ω.

4. The miniaturized multi-band LTE 4G antenna of claim 1, wherein the LTE 4G antenna supports a frequency band range of 1700-1900 MHz.