TWI415329B - Multi-incoming and outgoing RF transmitter and receiver - Google Patents

Abstract

A MIMO (multiple-input multiple-output) communication system, which is characterized by using the multi-polarized antennas as a medium of a transmitter and a receiver. It is described having at least one of the antennas includes a feeding component and a plurality of radiation units. The feeding component includes a feeding point for the first feeding signal, and the radiation units are respectively electrically connected to the feeding component and radiated out the different linear polarized waves in different directions.

Description

Multiple input and output RF signal transmitter and receiver

The invention relates to a wireless communication system, in particular to a multi-input and multi-out communication system.

In recent years, wireless communication systems have been developing in both directions of high speed and large bandwidth. However, to improve the speed, bandwidth and quality of transmission, the area that each base station can cover will be reduced. Therefore, if the network provider wants to provide wireless broadband communication services for the same area, the number of base stations is necessarily higher than the current one. The problem is greatly increased. The problem that arises from it is not simply the cost. The distance between the base stations and the base station will cause serious multiple access interference problems, which will also affect the stability of data transmission. Therefore, in order to solve this dilemma, multiple in multiple out (MIMO) communication technology can provide more stable data transmission, and the network capacity and bandwidth can be more effectively used.

MIMO refers to a communication technology in which a plurality of transmitting antennas and a plurality of receiving antennas are respectively installed at a transmitting end and a receiving end, and is transmitted through a transmitting end and a receiving end in comparison with a conventional single input single output (SISO). Multiple antenna transmission and reception enables the system to transmit data at a higher rate within a limited bandwidth, which is a significant increase in data throughput.

However, most of the products currently using MIMO on the market focus on increasing the maximum data throughput or reducing the loss on the transmission. However, there are still many dead ends for the receiving capability in different directions, which means that with the product Different angles of placement may result in the failure to receive RF signals, and thus the problem of unstable data throughput.

Accordingly, it is an object of the present invention to provide a multi-input and multi-output RF signal transmitter that provides stable data throughput.

Therefore, the present invention multi-input and multi-output RF signal transmitter for transmitting a plurality of secondary signals, and includes a serial to parallel (S/P) processing unit, and a plurality of parallel processing units An antenna that is electrically connected; the sequence-to-parallel processing unit is configured to divide the information signal into a plurality of sub-signals, and output the sub-signals to the antennas respectively; the antennas are used to separately transmit the signals And at least one of the antennas includes a feedthrough member and a plurality of radiating portions, the feedthrough member has a feed point for feeding one of the signals, and the radiating portions are electrically connected to the antenna The feed member is fed, and the sub-signals are respectively radiated by linearly polarized waves of different polarization directions.

Preferably, the at least one antenna includes a first radiating portion and a second radiating portion, and the polarization directions of the linear polarized waves radiated by the first radiating portion and the second radiating portion are orthogonal to each other.

Another object of the present invention is to provide a multi-input and multi-output RF signal receiver that can provide stable data throughput.

Therefore, the present invention has an RF signal receiver for receiving a plurality of secondary signals, and includes a rake receiver, and a plurality of antennas respectively electrically connected to the UI receiving unit; The receiving unit is configured to integrate the secondary signals into an information signal and output the signals; the antennas are configured to respectively receive the secondary signals, and at least one of the antennas includes a plurality of radiating portions, and a Electrically connecting the feeding members of the radiating portions, each of the radiating portions respectively receiving the secondary signals propagating in the space with linear polarized waves of different polarization directions, and the feeding member has a feeding point. The feed point is used to output one of the signals received by the radiation portions.

Preferably, the at least one antenna comprises a first radiating portion and a second radiating portion, and the polarization directions of the linear polarized waves receivable by the first radiating portion and the second radiating portion are orthogonal to each other.

The invention has the advantages of using antennas with different polarization characteristics to enhance the transceiving capability of polarized waves for different polarization directions, improving the problem of signal reception dead angle of the original antenna, and thus allowing the product to have different angles of display. Stable data throughput.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Referring to FIG. 1 , FIG. 1 is a block diagram of a preferred embodiment of a multiple in multiple out communication (MIMO) system, including a MIMO RF signal transmitter 1 and a MIMO RF signal receiving unit. Device 2. The MIMO RF signal transmitter 1 has a serial to Parallel (S/P) processing unit 12 and a plurality of antennas 11 electrically connected to the S/P processing unit 12, and a data signal is processed by S/P. After processing, the unit 12 divides into a plurality of sub-signals that are marked to distinguish, and then distributes them to different antennas 11, and the antennas 11 respectively transmit the sub-signals. The MIMO RF signal receiver 2 has a 接收-type receiving unit 22 and a plurality of antennas 21 electrically connected to the 接收-type receiving unit 22, and the antennas 21 respectively receive linearly polarized waves with different polarization directions in space. The secondary signals are transmitted, and then the rake receivers 22 then integrate the secondary signals into an information signal output. Other detailed technical content in the MIMO communication system 10, including an Orthogonal Variable Spreading Factor (OVSF) and a complex mathematical conversion, are not the focus of the present invention and should be familiar. As far as the art is known, the details are not described here. It should be noted that the number of the antennas 11 and 21 of the transmitter 1 and the receiver 2 shown in the figure is only a schematic diagram, and the actual number of terminals is adjusted according to the required transmission speed and circuit complexity, and is not in this embodiment. That is, its corresponding figure is limited.

The present invention is focused on the use of antenna types. In view of the fact that electronic products having the MIMO communication system 10 installed in the past have a situation in which data throughput is unstable when placed at certain angles, the present invention A preferred embodiment of the multi-input and multi-out communication system 10 employs antennas 11, 21 having multiple polarization directions to address the problem of unstable data throughput.

Referring to FIG. 2 and FIG. 3, FIG. 2 and FIG. 3 are respectively a front view and a back view of one of the antennas 21 of the antennas 11, 21 of the present embodiment. Each antenna 11 and 21 is an antenna 21 as shown in the figure, and each includes a first radiating portion 31, a second radiating portion 32, and a feeding member 33 electrically connected to each of the radiating portions 31, 32. The first radiating portion The polarization directions of the linearly polarized waves transmitted and received corresponding to the second radiating portion 32 are orthogonal to each other, and the feeding member 33 has a feeding point 333 for feeding the secondary signal or outputting the received secondary signal. In the present embodiment, the antennas 11, 21 used are dual-polarized antennas that can transmit and receive linearly polarized waves of two polarization directions, and are applied to the specifications of 802.11n.

The antennas 11 and 21 used in this embodiment are actually slot type antennas, which mainly include a substrate 4 having an opposite first surface 41 and a second surface 42 and are respectively provided. An antenna body 3 and a feed member 33 of the first surface 41 and the second surface 42 of the substrate 4.

In the present embodiment, the antenna body 3 is a sheet-shaped conductor and has a short-circuit point 34 for grounding, and is further formed with a first radiating portion 31 and a second radiating portion 32 in a groove shape. The first radiating portion 31 has two first slots 311 that are not in communication with each other. Each of the first slots 311 has a first slot 312 extending along a first direction D1, and two are respectively connected to the first slot 312. The second slot section 313 at the opposite end. The first slot segments 312 of the first slots 311 are parallel and adjacent to each other. The second radiating portion 32 has two second slots 321 which are not in communication with each other, and each of the second slots 321 has a third slot 322 extending in a second direction D2 different from the first direction D1, and two The fourth slot segments 323 are respectively connected to opposite ends of the third slot segment 322. The third slot segments 322 of the second slots 321 are spaced parallel and adjacent to one another. In this embodiment, the first direction D1 is orthogonal to the second direction D2. The second slot segments 313 of the first slots 311 are perpendicular to the first slot segments 312, and the fourth slot segments 323 of the second slots 321 are perpendicular to the third slot segments 322. More specifically, each of the first slots 311 has a U-shaped extension path, and each of the second slots 321 The extension path is U-shaped.

The feed member 3 disposed on the second surface 42 is a microstrip line, and the feed member 3 has a feed point 333, a first line end 331 on the back side of the first radiating portion 31, and a bit The second line end 332 on the back side of the second radiating portion 32. More specifically, the first line end 331 is partially spaced apart from the first slot segments 312, and the second line end 332 is partially spaced apart from the third slot segments 322. The first line end 331 and the second line end 332 of the antenna 11 can respectively feed the sub-signal coupling into the first radiating portion 31 and the second radiating portion 32; the first line end 331 and the second line end 332 of the antenna 12 respectively The first signal is received by being coupled to the first radiating portion 31 and the second radiating portion 32.

It should be noted that the antennas 11 and 21 used in this embodiment have two orthogonal polarization characteristics, but an antenna having two or more polarization characteristics may also be used according to actual requirements. The examples are limited.

This embodiment is mainly applied to 802.11n (including the 2.4 GHz frequency band). The actual size of the antenna is shown in FIG. 4. FIG. 4 shows the substrate 4 of one of the plurality of antennas 11, 21 and the first thereof. For a front view of the various components on the surface 41, reference may be made to the various data in the figures to determine the actual size of the embodiment.

FIG. 5 is a measurement data of the return loss of the antenna 21 of the present embodiment. This embodiment is applied to the frequency band of 802.11n. It can be known from experiments that the return loss of the antenna 21 is measured. According to the data displayed by the various points in the figure, it is less than -10 dB in the frequency band containing 2.4 GHz, which meets the basic requirements of the radiation performance of the antenna.

Radiation Pattern of this embodiment, as shown in Figure 6 and Figure 7. As shown in Figure 8. 6 is a radiation field type measurement result of the antenna 21 operating at 2.4 GHz, FIG. 7 is a radiation field type measurement result of the antenna 21 operating at 2.45 GHz, and FIG. 8 is an antenna 21 operating at 2.5 GHz. Radiation field type measurement results. It can be observed that the antenna 21 has a radiation field type that is quite close to omnidirectional, which overcomes the problem of poor gain in some directions of the antenna of the conventional MIMO communication system (with a dead angle of reception), and is also suitable for application to less pointing. The consideration is in the MIMO communication system 10.

Referring to Table 1 below, the data throughput of the MIMO communication system of the present embodiment and the antenna using only a plurality of single polarization directions in the past is shown. The unit of each data listed in the table is (Mbps), in the test experiment. The conventional antennas and the antennas of the present embodiment are respectively placed at three different angles. Since the antennas 11 and 21 used in this embodiment can transmit and receive linearly polarized waves of two polarization directions, the transmission signals are not compared. The dead angle is observed by the following data. This embodiment does maintain a relatively stable data throughput.

In summary, the present invention has the advantages of using antennas 11 and 21 having different polarization characteristics to enhance the transmission and reception capability of polarized waves for different polarization directions, and to improve the problem of signal reception dead angle of the original antenna, thereby allowing Products using MIMO communication system 10 can have stable data throughput at different placement angles.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

10‧‧‧Multiple-in and multi-communication systems

32‧‧‧Second Radiation Department

1‧‧‧Multiple-in and extra-radio signal transmitters

321‧‧‧Second slot

322‧‧‧third trough section

2‧‧‧Multiple input and output RF signal receiver

323‧‧‧fourth slot

33‧‧‧Feed parts

11‧‧‧Antenna

331‧‧‧first line end

12‧‧‧Sequence to parallel processing unit

332‧‧‧second line

333‧‧‧Feeding point

21‧‧‧Antenna

34‧‧‧ Short circuit point

22‧‧‧耙 receiving unit

4‧‧‧Substrate

3‧‧‧Antenna body

41‧‧‧ first surface

31‧‧‧First Radiation Department

42‧‧‧ second surface

311‧‧‧ first slot

D1‧‧‧ first direction

312‧‧‧First trough section

D2‧‧‧ second direction

313‧‧‧Second trough section

1 is a block diagram of a preferred embodiment of a multiple in multiple out (MIMO) system; FIG. 2 and FIG. 3 are respectively a front view of one of the antennas of the antenna of the present embodiment; FIG. 4 is a front view of the substrate of the antenna and the first surface of the antenna; FIG. 5 is a measurement data of the return loss of the antenna of the embodiment; FIG. 6 is the antenna of the embodiment. The measurement results of the radiation field type at 2.4 GHz; Figure 7 shows the measurement results of the radiation field type of the antenna operating at 2.45 GHz; and Figure 8 shows the measurement results of the radiation field type of the antenna operating at 2.5 GHz.

10. . . Multiple input and multiple communication system

11. . . antenna

1. . . Multiple input and more RF signal transmitter

12. . . Sequence to parallel processing unit

twenty one. . . antenna

2. . . Multiple input and output RF signal receiver

twenty two. . .接收 receiving unit

Claims (12)

A multi-input and multi-output RF signal transmitter for transmitting a plurality of sub-signals, and comprising: a serial-to-parallel processing unit for dividing an information signal into the sub-signals and respectively outputting the sub-signals; And a plurality of antennas respectively electrically connected to the sequence and parallel processing unit, and configured to respectively transmit the respective signals, wherein at least one of the antennas comprises: a substrate having an opposite first surface and a second An antenna body disposed on the first surface of the substrate and having a first radiating portion and a second radiating portion, the first radiating portion having two first slots not communicating with each other, each of the first The slot has a first slot extending in a first direction, and two second slots respectively communicating with opposite ends of the first slot, the first slot of the first slot being parallel and adjacent to each other The second radiating portion has two second slots that are not in communication with each other, and each of the second slots has a third slot extending in a second direction different from the first direction, and the second slot is respectively connected to The third slot segment has opposite ends a fourth slot segment, the third slot segments of the second slot are parallel and adjacent to each other; and a feed member disposed on the second surface of the substrate and having a feed point for feeding one of the signals a first line end partially overlapping the first slot segments, and a second line end partially overlapping the third slot segments, the first line end and the second line The line ends respectively can couple the signal to the first radiating portion and the second radiating portion, wherein the first radiating portion and the second radiating portion can respectively use the linear poles of different polarization directions The wave is radiated. The multi-input and multi-output RF signal transmitter according to claim 1, wherein the first direction is orthogonal to the second direction, and the first radiating portion and the second radiating portion of each antenna radiate The polarization directions of the linearly polarized waves are orthogonal to each other. The multi-input and multi-output RF signal transmitter according to claim 2, wherein the first radiating portion can radiate the sub-signal with a linear polarized wave of a vertical polarization direction, and the second radiation The portion can radiate the signal with a linearly polarized wave of a horizontal polarization direction. The multi-input and multi-output RF signal transmitter according to claim 2, wherein the first radiating portion can radiate the sub-signal with a linear polarized wave of a +45° polarization direction, and the first The second radiating portion can radiate the sub-signal with a linear polarized wave of a polarization angle of -45°. According to the multi-input and multi-output RF signal transmitter of claim 1, wherein the second slot segments of each of the first slots are substantially perpendicular to the first slot segment, and the second slot is The fourth slot segments are substantially perpendicular to the third slot segment. The multi-input and multi-output RF signal transmitter according to claim 5, wherein each of the first slots has a U-shaped extending path, and each of the second slots has a U-shaped extending path. A multi-input and multi-output RF signal receiver for receiving a plurality of sub-signals Each of the signals propagates in space with a linearly polarized wave of different polarization directions, and includes: a plurality of antennas for respectively receiving the secondary signals, and at least one of the antennas includes: a substrate. Having an opposite first surface and a second surface; an antenna body disposed on the first surface of the substrate and having a first radiating portion and a second radiating portion, the first radiating portion having two a first slot that is connected to each other, the first slot has a first slot extending in a first direction, and two second slots respectively communicating with opposite ends of the first slot, the first slot The first slot segments of the holes are parallel and adjacent to each other, and the second radiating portion has two second slots that are not in communication with each other, and each of the second slots has a second direction extending in a direction different from the first direction. a third slot segment, and a second slot segment respectively communicating with opposite ends of the third slot segment, the third slot segments of the second slot are spaced parallel to each other and adjacent to each other; and a feed member disposed at the a second surface of the substrate and having a feed point, a first a first line end of the segment partially overlapping, and a second line end partially overlapping the third slot segment, the first line end and the second line end respectively being opposite to the first radiating portion and the second The radiant unit is coupled to receive the sub-signal; and a 接收-type receiving unit is electrically connected to the feeding points of the antennas and used to integrate the sub-signals into an information signal. Multi-input and multi-output RF signal reception as described in item 7 of the patent application scope The first direction is orthogonal to the second direction, and the polarization directions of the linearly polarized waves receivable by the first radiating portion and the second radiating portion of the antenna are orthogonal to each other. The multi-input and multi-output RF signal receiver according to claim 8, wherein the first radiating portion can receive a linearly polarized wave in a vertical polarization direction, and the second radiating portion can receive a horizontal electrode. A linearly polarized wave of the direction. The multi-input and multi-output RF signal receiver according to claim 8 , wherein the first radiating portion can receive a linearly polarized wave of a +45° polarization direction, and the second radiating portion can receive a Linearly polarized wave of -45° polarization direction. According to the multi-input and multi-output RF signal receiver of claim 7, wherein the second slot segments of each of the first slots are substantially perpendicular to the first slot segment, and the second slots are The fourth slot segments are substantially perpendicular to the third slot segment. The multi-input and multi-output RF signal receiver according to claim 11, wherein each of the first slots has a U-shaped extending path, and each of the second slots has a U-shaped extending path.