Differential feeder power synthesis transceiving integrated antenna

Abstract

The utility model relates to a differential feeder power synthesis transmit-receive integrated antenna. The antenna is of a back-fed structure, and the antenna is provided with a transmitting interface TX1 which is connected with a differential signal TXN arranged on a chip of the transceiver; the transmitting interface TX2 is connected with the other path of differential signal TXP arranged on the chip of the transceiver; the receiving port RX is connected with a radio frequency signal input port arranged on a chip of the transceiver; and the grounding end GND of the antenna is connected with the grounding end GND of the transceiver in a common ground connection mode. The differential power amplifier has the beneficial effects that the output of the differential power amplifier can be simplified, the module size is reduced, the transmitting power can be effectively improved, and the power consumption and the cost of a system can be reduced. The method can be applied to multiple scenes such as low-cost millimeter wave radars, Wi-Fi transceivers, 5G client transceivers and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic equipment and electronic devices, in particular to a differential feeder power synthesis transceiver integrated antenna, which can be used in multiple scenarios such as low-cost millimeter wave radar, Wi-Fi transceiver, 5G client transceiver, etc. The differential feeding power synthesis transceiver integrated antenna simplifies the output of the differential power amplifier, not only reduces the module size, but also effectively increases the transmission power, which can reduce system power consumption and cost. Background Art

[0002] Using the common-mode suppression capability of differential circuits to reduce external interference is often used in SOC chips with integrated radio frequency. While providing convenience, it also brings some other problems.

[0003] The use of differential receiving circuit is to improve the anti-interference ability by converting the input single-ended signal into differential signal. In the RF transmitting circuit, what is ultimately needed is a single-ended output signal. In order to realize the conversion of differential signal to single-ended signal, balun or transformer is often used to complete this function. In theory, after the balun is used for transformation, the transmission power is equal to the power sum of two separate differential signals. However, if the balun or transformer is made inside the chip, because the balun or transformer is made of inductor, the inductor device itself will occupy a relatively large chip area. On the other hand, the inductor has eddy current effect, so the other corresponding metal layers below it are not suitable for wiring, which further increases the demand for chip area and increases chip cost. If an external method is used, it is necessary to select a matching balun or transformer according to the chip frequency and power, which increases the difficulty for customers in using the chip and raises the material cost.

[0004] Another way is to connect one of the two differential outputs to a 50 ohm load and the other to an antenna. Although this application simplifies the use of the chip, the output power is only one signal, and the other signal is consumed by the load in the form of heat, which reduces the efficiency of energy use.

[0005] If both differential output ports of the chip are connected to antennas, the requirement of transmitting all the transmission power can be met. However, since the signal is located on two antennas and one antenna is also required for reception, the PCB area and module size are increased, which is not conducive to the miniaturization of the equipment and increases the cost. Summary of the invention

[0006] The purpose of the utility model is to provide a differential feeder power synthesis transceiver integrated antenna and application thereof.

[0007] The utility model is realized by the following technical scheme: a differential feeder power synthesis transceiver integrated antenna, which is a back-feed structure antenna, and the antenna is provided with

[0008] The transmitting interface TX1 11 is connected to a differential signal TXN provided in the chip of the transceiver;

[0009] The transmitting interface TX2 12 is connected to another differential signal TXP provided in the chip of the transceiver;

[0010] A receiving port RX13 connected to a radio frequency signal input port provided on the chip of the transceiver; and

[0011] The ground terminal GND14 of the antenna is connected to the ground terminal GND14 of the transceiver in a common ground connection manner.

[0012] Compared with the previous technology, the beneficial effects of the utility model are:

[0013] 1. The utility model can simplify the output of the differential power amplifier, which not only reduces the module size, but also effectively improves the transmission power and reduces the system power consumption and cost.

[0014] 2. The utility model can realize power synthesis directly on the antenna without the need for a balun or a transformer, and transmit the signal. At the same time, the reception is also completed by the antenna, achieving the unity of combined output, integrated transmission and reception, and module miniaturization.

[0015] 3. It can be used in multiple scenarios such as low-cost millimeter-wave radar, Wi-Fi transceiver, 5G client transceiver, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the connection between the utility model and the transceiver;

[0017] Figure 2 It is a schematic diagram of the structure of the information layer;

[0018] Figure 3 It is a schematic diagram of the structure of the stratum;

[0019] Figure 4 It is a schematic diagram of the structure of the radiation layer;

[0020] Figure 5 It is a partial cross-sectional view of the utility model along the connecting line of the transmitting interface TX1, the ground terminal GND, and the transmitting interface TX2.

[0021] Explanation of reference numerals: 11 transmitting interface TX1, 12 transmitting interface TX2, 13 receiving port RX, 14 ground terminal GND, 21 radiation layer, 22 second dielectric layer, 23 ground layer, 24 first dielectric layer, 25 signal layer, 26 via. DETAILED DESCRIPTION

[0022] The utility model is described in detail below in conjunction with the accompanying drawings:

[0023] like Figure 1-5 As shown: a differential feeder power synthesis transceiver integrated antenna, which is a back-feed structure antenna, the antenna is provided with

[0024] The transmitting interface TX1 11 is connected to a differential signal TXN (i.e., a complementary end TXN path) of a differential transmitting port of a transceiver in the chip;

[0025] The transmitting interface TX2 12 is connected to another differential signal TXP of the differential transmitting port of the transceiver in the chip (i.e., the same phase end TXP path);

[0026] A receiving port RX 13 connected to a radio frequency signal input port of a chip of a transceiver; and

[0027] The ground terminal GND 14 is connected to the ground terminal GND 14 of the transceiver in a common ground connection manner.

[0028] In order to better illustrate the specific connection relationship, the two differential signals in the transceiver chip are named TXN and TXP. The two differential signals TXN and TXP in the chip are output through the same distance transmission line and connected to the two transmitting interfaces TX1 and TX2 of the antenna.

[0029] The structure of the antenna is, from bottom to top, a radiation layer 21 (generally the bottom layer of a PCB board), a second dielectric layer 22, a ground layer 23, a first dielectric layer 24, and a signal layer 25 (generally the top layer of a PCB board); the radiation layer 21, the ground layer 23, and the signal layer 25 are all metal dielectrics, and an antenna vibrator is provided on the radiation layer 21 as a radiation unit (that is, an antenna in the usual sense, in which the dielectric layer material and the distance between the antenna vibrator and the ground layer affect the antenna parameters).

[0030] Among them, vias 26 are provided at the positions corresponding to the transmitting interface TX1 11, the transmitting interface TX2 12, the receiving port RX 13 and the ground terminal GND14 of the antenna; so that the ground layer 23 is connected to the radiation unit through the hole 26; the RF signal of the signal layer 25 is connected to the radiation unit through the via 26, completing the signal feeding in and out.

[0031] The via 26 corresponding to the ground terminal GND 14 is located at the center of the antenna;

[0032] The corresponding via holes 26 of the transmitting interface TX1 11 and the transmitting interface TX2 12 are located on both sides of the via hole 26 corresponding to the ground terminal GND14 and are centrally symmetrical;

[0033] The receiving port is located on the perpendicular bisector of the center of the line connecting the corresponding vias 26 of the RX13 transmitting interface TX1 11 and the transmitting interface TX2 12.

[0034] The via hole 26 is a through hole that passes through the antenna from top to bottom. In order to save costs, the via hole connecting the ground layer and the radiation unit is made into a through hole instead of a blind hole.

[0035] The antenna element is a quasi-symmetrical polygon or a symmetrical polygon structure or a circle. The antenna element is generally on the bottom layer, and the bottom layer is generally facing outwards toward the moving object or unit to be measured.

[0036] Different antenna structures, shapes and feeding point positions will result in different antenna performances. The structure described in the utility model is applicable to other forms of symmetrical antennas (mainly referring to the shape of the antenna vibrator, because in general, the stratum and dielectric layer can be considered as infinite planes). Of course, if the requirements are not high, it can also be a quasi-symmetrical polygon.

[0037] An application of a differential feeder power synthesis transceiver integrated antenna in a chip, wherein the chip is a SOC chip with integrated radio frequency. Specifically, it can be used in multiple scenarios such as low-cost millimeter wave radar, Wi-Fi transceiver, 5G client transceiver, etc.

[0038] Here’s how it works:

[0039] The present invention is described below in conjunction with specific embodiments.

[0040] Take the 5.8GHz motion-triggered radar module as an example. The motion-sensing radar trigger chip designed and manufactured using CMOS technology is small in size, low in cost and low in power consumption. It is made into a radar module with a PCB board antenna and can be installed in LED lamps to realize intelligent lighting that turns on the light when people come and turns off the light when people leave, saving overall electricity consumption in society. At present, the infrared sensing automatic lights installed in the corridors of buildings rely on Fresnel lenses to partition the space and use differential input thermopiles to identify human infrared thermal radiation. Although the cost is low, the infrared sensing probe needs to be installed independently because the LED emits light and heat, which interferes with the work of the infrared detector. Infrared sensing lamps are only suitable for installation when new houses and buildings are renovated, and it is not convenient to enter thousands of households. In addition, the Fresnel lens made of organic glass is prone to aging over time, which will reduce the sensitivity of the infrared sensor. In addition, the ambient temperature in southern buildings in summer is close to the human body temperature, which can easily lead to the inability to recognize human movement, resulting in the difficulty of not turning on the light when people come. The motion sensing chip using the Doppler speed measurement principle to manufacture the radar sensing module has the advantage of working all day and can be placed directly in the lamp. In particular, the radar module is placed inside the bulb, which greatly facilitates the use of it by thousands of households in their own corridors, cloakrooms, storage rooms and even kitchens and toilets.

[0041] However, in order to adapt to low-cost home use, radar chips need to be very low cost. The 5.8GHz motion sensing radar chip contains a voltage-controlled oscillator that generates a radio frequency source, a power amplifier, a receiving low-noise amplifier, a receiving mixer, an intermediate frequency amplifier with a very low operating frequency, and an analog-to-digital converter, an MCU or equivalent digital logic to determine the radar trigger signal. With such a high degree of integration, a SOC chip of course requires a differential design to reduce the interference inside the chip. However, because the size of the balun inside the chip is relatively large, integrating the balun inside the chip to convert the differential into a single-ended output increases the chip cost. The cost of using a balun on a PCB board is relatively high. When radar module manufacturers use a radar sensing chip with differential output, they actually only send the in-phase end of the RF output to the transmitting end of the transceiver antenna, and the complementary output end with the same transmission power is directly connected to a 50-ohm matching resistor, which wastes this part of the RF power. In order to obtain the same detection distance, the chip's transmission gain is actually increased, so the chip's operating current increases.

[0042] Now, according to the principle provided by the utility model, on the basis of the original hexagonal transceiver antenna, the receiving RX and the center ground point GND are used as the symmetry axis, the transmission power feed point is mirrored to generate another transmission power feed point, and the differential output end of the chip power amplifier is connected to these two RF feed points by a strictly equal-length microstrip line routing method. On the PCB board, the transceiver antenna is generally located in the center of the transceiver pins of the chip. The actual lengths of the in-phase end and the complementary end of the differential output to the antenna are not equal, so the differential routing method is used to first send them to a position close to the antenna and then separate them. Therefore, the differential feeding method increases the transmission power by nearly 3dB compared to the single-ended feeding method without a balun. Compared with the method using a balun, the cost of a balun is saved. Purchasing radar sensor chips with differential outputs without a balun is cheaper because the chip area is smaller than that of the chip with a balun.

[0043] Because the 1 / 4 wavelength of 5.8GHz is about 13mm, even if the circuit board size is only 20mmx20mm, there is enough space to make the PCB board antenna, so that the motion sensing radar module is small enough to be directly placed in the bulb. If it is a 10GHz or 24GHz radar, the wavelength is shorter, the PCB antenna size is smaller, and the entire radar module area is smaller. In short, the use of a differential feed-type transceiver antenna can reduce costs, reduce power consumption, and has commercial value. The widespread use of automatic lights with motion sensing radar chips can save electricity, reduce carbon emissions, and contribute to green environmental protection.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A differential feeder power synthesis transceiver integrated antenna, characterized in that: It is a back-feed antenna. The transmitting interface TX1 (11) is connected to a differential signal TXN provided in the chip of the transceiver; The transmitting interface TX2 (12) is connected to another differential signal TXP provided in the chip of the transceiver; A receiving port RX (13) connected to a radio frequency signal input port provided on a chip of the transceiver; and The ground terminal GND (14) of the antenna is connected to the ground terminal GND (14) of the transceiver in a common ground connection manner; The structure of the antenna comprises, from bottom to top, a radiation layer (21), a second dielectric layer (22), a ground layer (23), a first dielectric layer (24), and a signal layer (25); the radiation layer (21), the ground layer (23), and the signal layer (25) are all metal dielectrics, and an antenna vibrator is provided on the radiation layer (21) as a radiation unit; Wherein, via holes (26) are provided at positions corresponding to the transmitting interface TX1 (11), the transmitting interface TX2 (12), the receiving port RX (13) and the ground terminal GND (14) of the antenna; so that the ground layer (23) is connected to the radiation unit through the hole (26); the radio frequency signal of the signal layer (25) is connected to the radiation unit through the via hole (26), thereby completing the signal feeding in and out; The via hole (26) corresponding to the ground terminal GND (14) is located at the exact center of the antenna; The corresponding via holes (26) of the transmitting interface TX1 (11) and the transmitting interface TX2 (12) are located on both sides of the via hole (26) corresponding to the ground terminal GND (14) and are centrally symmetrical; The receiving port RX (13) is located on a perpendicular bisector of the center of the line connecting the corresponding via holes (26) of the transmitting interface TX1 (11) and the transmitting interface TX2 (12).

2. The differential feeder power synthesis transceiver integrated antenna according to claim 1, characterized in that: The via hole (26) is a through hole that passes through the antenna vertically.

3. The differential feeder power synthesis transceiver integrated antenna according to claim 1, characterized in that: The antenna element is a symmetrical polygonal structure or a circle.

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