CN107221761B - Smart Antenna and Wireless Communication Device - Google Patents

Abstract

A smart antenna and a wireless communication device. The smart antenna includes a dipole antenna, a first reflection unit, a first diode, a first radio frequency choke unit and a second radio frequency choke unit; the dipole antenna has a first radiation part and a second radiation part, the first radiation part is used to feed a radio frequency signal and a direct current voltage at the same time; the first reflection unit has a first section and a second section, which are arranged in parallel on a first side of the dipole antenna; the first diode is electrically connected between the first section and the second section, and the direct current voltage is used to control the conduction state of the first diode; the first radio frequency choke unit is electrically connected between the first radiation part and the first section of the first reflection unit; the second radio frequency choke unit is electrically connected between the second radiation part and the second section of the first reflection unit. The present invention can enhance the flexibility of product design and use.

Description

Smart Antenna and Wireless Communication Device

technical field

The present invention relates to an antenna and a wireless communication device having the antenna, and more particularly, to a smart antenna and a wireless communication device having the smart antenna.

Background technique

At present, the antennas used in general network communication products usually have an omnidirectional radiation pattern, such as a dipole antenna. However, when the position of the product is fixed, only fixed radiation characteristics can be provided to transmit and receive signals. Therefore, the problem of poor transmission and reception of signals across floors often occurs, which reduces the transmission speed.

In traditional antenna design, multiple fixed-position antennas are used, and switching components are used in conjunction with the circuit board of the wireless module (or the circuit board of the entire system) to control the overall radiation pattern. However, because the setting position of the antenna is a fixed position in the product, it is necessary to make a more complicated design for the antenna itself, or use a more complicated switch to achieve the purpose of controlling the radiation pattern. Antenna designers are thus limited by overall product considerations and encounter considerable design constraints on antenna design.

Therefore, it is necessary to provide a smart antenna and a wireless communication device to solve the above problems.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a smart antenna and a wireless communication device with the smart antenna. The driven switching element (diode) is moved from the circuit board of the wireless module to the antenna itself, and the switching element (diode) is integrated with the antenna. Design, the radiation pattern of the dipole antenna can be easily changed, thereby solving the problems of the traditional technology by using the overall design of the antenna with the selectivity of the radiation direction.

An embodiment of the present invention provides an intelligent antenna, including a dipole antenna, a first reflection unit, a first diode, a first radio frequency choke unit, and a second radio frequency choke unit. The dipole antenna has a first radiating part and a second radiating part, and the first radiating part is used for feeding a radio frequency signal and a DC voltage at the same time. The first reflection unit is arranged parallel to the first side of the dipole antenna. The first diode is electrically connected between the first section and the second section, and the direct current voltage is used to control the conduction state of the first diode. The first radio frequency choke unit is electrically connected between the first radiation part and the first section of the first reflection unit. The second radio frequency choke unit is electrically connected between the second radiation part and the second section of the first reflection unit.

An embodiment of the present invention also provides a smart antenna, the smart antenna includes: a dipole antenna, the dipole antenna has a first radiating part and a second radiating part, the first radiating part is used for feeding in simultaneously a radio frequency signal and a DC voltage; a first reflection unit, the first reflection unit has a first section and a second section, which are arranged in parallel on a first side of the dipole antenna; a first dipole tube, the first diode is electrically connected between the first section and the second section, the DC voltage is used to control the conduction state of the first diode; a first radio frequency choke unit , the first radio frequency choke unit is electrically connected between the first radiation part and the first section of the first reflection unit; and a second radio frequency choke unit, the second radio frequency choke unit is electrically connected connected between the second radiation part and the second section of the first reflection unit.

An embodiment of the present invention provides a wireless communication device, including a T-type bias circuit (Bias Tee), a DC voltage supply unit, a dipole antenna, a coaxial cable, a first reflection unit, a first diode, and a first radio frequency a choke unit and a second radio frequency choke unit. The T-shaped bias circuit has a first end, a second end and a third end. The first end of the T-shaped bias circuit receives a radio frequency signal, and the second end of the T-shaped bias circuit receives a DC voltage. The DC voltage supply unit is electrically connected to the second end of the T-shaped bias circuit to generate a DC voltage. The dipole antenna has a first radiating part and a second radiating part, and the first radiating part is used for feeding a radio frequency signal and a DC voltage at the same time. The coaxial cable has a feed end and a ground end, the feed end is electrically connected between the third end of the T-type bias circuit and the first radiation part of the dipole antenna, and the ground end is electrically connected to the dipole antenna. between the second radiation part and a system ground. The first reflection unit is arranged parallel to the first side of the dipole antenna. The first diode is electrically connected between the first section and the second section, and the direct current voltage is used to control the conduction state of the first diode. The first radio frequency choke unit is electrically connected between the first radiation part and the first section of the first reflection unit. The second radio frequency choke unit is electrically connected between the second radiation part and the second section of the first reflection unit.

An embodiment of the present invention also provides a wireless communication device, the wireless communication device includes: a T-shaped bias circuit, the T-shaped bias circuit has a first end, a second end and a third end, the T-shaped bias circuit has a first end, a second end and a third end. The first end of the setting circuit receives a radio frequency signal, and the second end of the T-type bias circuit receives a DC voltage; a DC voltage supply unit is electrically connected to the DC voltage supply unit of the T-type bias circuit The second end generates the DC voltage; a dipole antenna, the dipole antenna has a first radiating part and a second radiating part, the first radiating part is used to feed a radio frequency signal and a DC voltage at the same time; a A coaxial cable, the coaxial cable has a feed end and a ground end, the feed end is electrically connected to the third end of the T-shaped bias circuit and the first radiation portion of the dipole antenna the ground terminal is electrically connected between the second radiation part of the dipole antenna and a system ground; a first reflection unit, the first reflection unit has a first section and a second section , the first reflection unit is arranged in parallel on a first side of the dipole antenna; a first diode, the first diode is electrically connected between the first section and the second section, The DC voltage is used to control the conduction state of the first diode; a first radio frequency choke unit, the first radio frequency choke unit is electrically connected to the first radiation part and the first radiator of the first reflection unit between a section; and a second radio frequency choke unit, the second radio frequency choke unit is electrically connected between the second radiation part and the second section of the first reflection unit.

To sum up, the embodiments of the present invention provide a smart antenna and a wireless communication device having the smart antenna. The radiation pattern of the dipole antenna can be easily changed by switching the diodes on the reflection unit. Because of the easy adjustment mechanism, the smart antenna of the embodiment of the present invention can be easily installed in any required (or possible) position of the wireless communication device, thereby improving the flexibility of product design and use.

In order to further understand the features and technical content of the present invention, please refer to the following detailed descriptions and accompanying drawings of the present invention, but these descriptions and accompanying drawings are only used to illustrate the present invention, rather than to the scope of rights of the present invention make any restrictions.

Description of drawings

FIG. 1 is a functional block diagram of a wireless communication device with a smart antenna provided by an embodiment of the present invention.

FIG. 2 is a schematic diagram of a smart antenna provided by an embodiment of the present invention.

FIG. 3 is a schematic diagram of the smart antenna of FIG. 2 implemented on a microwave substrate.

FIG. 4 is a radiation pattern diagram of the diode of the reflection unit of the smart antenna of FIG. 2 in a non-conducting state.

FIG. 5 is a radiation pattern diagram of the diode of the reflection unit of the smart antenna of FIG. 2 in a conducting state.

FIG. 6 is a schematic diagram of a smart antenna provided by another embodiment of the present invention.

FIG. 7 is a radiation pattern diagram of the smart antenna of FIG. 6 when the DC voltage supplied to the two reflecting units is zero voltage.

FIG. 8 is a radiation pattern diagram of the smart antenna of FIG. 6 in which the DC voltage supplied to the two reflecting units is a positive voltage, so that the first diode is turned off and the second diode is turned on.

FIG. 9 is a radiation pattern diagram of the smart antenna of FIG. 6 when the DC voltage supplied to the two reflecting units is a negative voltage, so that the first diode is turned on and the second diode is turned off.

FIG. 10 is a schematic diagram of a smart antenna provided by another embodiment of the present invention.

FIG. 11 is a circuit diagram of a decoder of the DC voltage supply unit of FIG. 1 .

FIG. 12 is a functional block diagram of a wireless communication device with a smart antenna provided by another embodiment of the present invention.

Explanation of main component symbols:

1 Wireless communication device

100 System Boards

11, 551, 552…55n Smart Antenna

12, 541, 542…54n T-bias circuit

13 DC voltage supply unit

131, 51 Control unit

132, 531, 532…53n decoders

14 Wireless Module

RF, RF1, RF2…RFn RF Signals

DC, DC1, DC2…DCn DC voltage

111, 311 dipole antenna

111a, 311a The first radiation part

111b, 311b The second radiation part

111c, 311c signal source

112, 312, 315 Reflector

112a, 312a first section

112b, 312b Second section

112c diode

113 First RF choke unit

114 Second RF choke unit

20 Microwave substrate

4 coaxial cables

1131 First RF Choke Assembly

1132 Second RF Choke Assembly

1141 Third RF Choke Assembly

1142 Fourth Choke Choke Assembly

21, 22 wires

f1, f2 feed point

Z, Y axis

313, 314, 316, 317 RF Choke Units

312c first diode

315c second diode

S1, S2 SPDT switch

Bit1-1, Bit1-2, Bit2-1, Bit2-2, parallel signal

Bitn-1, Bitn-2

+Vdd positive voltage

-Vdd negative voltage

0V ground

52 Serial-Parallel Converters

315a Third paragraph

315b Fourth paragraph

data data

clock

Detailed ways

(Embodiment of Smart Antenna and Wireless Communication Device with Smart Antenna)

Please refer to FIG. 1. FIG. 1 is a functional block diagram of a wireless communication device with a smart antenna provided by an embodiment of the present invention. The wireless communication device 1 has a system circuit board 100 . Besides, the wireless communication device 1 further includes a smart antenna 11 , a T-type bias circuit 12 , a DC voltage supply unit 13 and a wireless module 14 . In addition, according to the main functions and types of the wireless communication device 1, the wireless communication device 1 should also have other functional blocks or related circuits, which are omitted in this embodiment. For example, the wireless communication device 1 may be a wireless router, and the wireless router has functional circuits or chips capable of performing routing functions according to network protocols and algorithms, but the present invention does not limit the type of the wireless communication device 1 accordingly.

In this embodiment, the T-type bias circuit 12 , the DC voltage supply unit 13 and the wireless module 14 are all disposed on the system circuit board 100 of the wireless communication device 1 , and the smart antenna 11 is independent of the system circuit of the wireless communication device 1 . Outside the board 100 , the smart antenna 11 can be electrically connected to the T-bias circuit 12 through a coaxial cable (shown in FIG. 3 ), so that the setting position of the smart antenna 11 is not limited to the system circuit board 100 itself.

The T-type bias circuit 12 has a first end, a second end and a third end, the first end is electrically connected to the wireless module 14 , the second end is electrically connected to the DC voltage supply unit 13 , and the third end is electrically connected to the smart antenna 11. The first end of the T-shaped bias circuit 12 receives the radio frequency signal RF from the wireless module 14 , and can block the DC voltage DC from the second end of the T-shaped bias circuit 12 from being transmitted to the wireless module 14 . The second end of the T-shaped bias circuit 12 receives the DC voltage DC from the DC voltage supply unit 13 , and can block the radio frequency signal RF from the first end of the T-shaped bias circuit 12 from being transmitted to the DC voltage supply unit 13 . The DC voltage supply unit 13 is electrically connected to the second end of the T-shaped bias circuit 12 and generates a DC voltage DC.

The T-type bias circuit 12 is a common three-port network, and its equivalent circuit is composed of an equivalent capacitance (C) and an equivalent inductance (L). The equivalent capacitance is connected to the first end of the T-type bias circuit 12, allowing the radio frequency signal RF to pass through and blocking the DC signal (DC voltage DC), and the equivalent inductance is connected to the second end of the T-type bias circuit 12, allowing the The direct current signal (direct current voltage DC) passes through, and the alternating current signal (radio frequency signal RF) is blocked. However, the present invention does not limit the implementation of the T-type bias circuit 12. The T-type bias circuit 12 is a well-known technology that is easily understood by those of ordinary skill in the art, and will not be described again.

The DC voltage supply unit 13 can generate at least two DC voltages to control the driven element of the smart antenna 11, so as to achieve radiation field switching. The driven components of the smart antenna 11 will be further described later. Here, the DC voltage generated by the DC voltage supply unit 13 will be described first. In one embodiment, the DC voltage supply unit 13 can generate two DC voltages, including a positive voltage +V (or a negative voltage -V) and a zero voltage (0V). In another embodiment, the DC voltage supply unit 13 may generate three DC voltages, including a positive voltage +V, a negative voltage, and a zero voltage (0V). However, the present invention is not limited thereto, for example, the DC voltage supply unit 13 can also generate more than three types of DC voltages. In practical applications, the DC voltage supply unit 13 may include, for example, a control unit 131 and a decoder 132 as shown in FIG. 1 . The decoder 132 outputs a specific DC voltage according to a control signal from the control unit 131 , but the invention is not limited thereto. Based on the DC voltage controlled by the DC voltage supply unit 13, the radiation pattern of the smart antenna 11 will be changed accordingly, and the details of the smart antenna of this embodiment will be further described below.

Please refer to FIG. 1 and FIG. 2 at the same time. FIG. 2 is a schematic diagram of a smart antenna provided by an embodiment of the present invention. The smart antenna includes a dipole antenna 111 , at least one reflection unit 112 , at least one diode 112 c , a first radio frequency choke unit 113 and a second radio frequency choke unit 114 . The dipole antenna 111 has a first radiation portion 111a and a second radiation portion 111b. The dipole antenna 111 is typically implemented as a half-wavelength dipole antenna. The reflection unit 112 has a first section 112a and a second section 112b, and a diode 112c is disposed between the first section 112a and the second section 112b. Since the diode 112c is controlled by the direct current voltage DC, the reflection unit 112 is opposite to The DC voltage supply unit 13 can be regarded as a driven component. In FIG. 2 , the reflection unit 112 is arranged parallel to one side of the dipole antenna 111 , for example, the right side in FIG. 2 . In a preferred embodiment, the distance between the reflection unit 112 and the dipole antenna 111 is between one eighth (0.125λ) to one quarter (0.25λ) of the wavelength corresponding to the operating frequency of the dipole antenna 11 However, the present invention is not limited thereby.

The first radiating portion 111a of the dipole antenna 111 has a first feeding point, which is a first feeding point (eg, a connection signal terminal), and the second radiating portion 111b has a second feeding point (eg, a grounding point). In 2, a signal source 111c is used to connect the first feeding point and the second feeding point to represent the electrical connection mode of signal transmission. The diode 112c is electrically connected between the first segment 112a and the second segment 112b, and the DC voltage DC is used to control the conduction state of the diode 112c. The first RF choke unit 113 is electrically connected between the first radiation portion 111 a and the first section 112 a of the reflection unit 112 . The second RF choke unit 114 is electrically connected between the second radiation portion 111 b and the second section 112 b of the reflection unit 112 .

The first radiating portion 111a of the dipole antenna 111 is used to feed the radio frequency signal RF and the DC voltage DC simultaneously. The radio frequency signal RF is used to excite the antenna to generate radiation. The direct voltage DC is used to control the conduction state of the diode 112c. When the DC voltage DC is fed through the first feeding point and the second feeding point of the dipole antenna 111 , assuming that the first feeding point is the signal terminal, the DC voltage DC will pass through the first radiating part 111 a and the first RF choke The unit 113 and the first section 112a of the reflection unit 112 are transmitted to the diode 112c (eg, the anode of the diode 112c of FIG. 2 ), and then (via the cathode of the diode 112c of FIG. 2 ) and then through the second section 112b of the reflection unit 112 , the second RF choke unit 114 and the second radiating part 111b are returned to the signal source 111c connected to the second feeding point to generate a loop. The DC voltage DC will generate a voltage across the first RF choke unit 113, the second RF choke unit 114, and the diode 112c. By appropriately determining the magnitude of the DC voltage DC, a sufficient voltage across the diode 112c can be generated (ie, greater than the forward voltage of the diode 112c) so that the diode 112c can be turned on, whereby the first section 112a and the second section 112b of the reflection unit 112 will be conductive with each other. The magnitude of the DC voltage DC capable of making the diode 112c conductive is, for example, 3V, but the present invention is not limited thereto. The direct current voltage DC may be provided by, for example, the working voltage in the wireless communication device 1, but the present invention is not limited thereto. Conversely, when the direct current voltage DC is zero or insufficient to make the diode 112c conduct, the first section 112a and the second section 112b of the reflection unit 112 are non-conductive with each other.

In a preferred embodiment, when the diode 112c is turned on under the control of the DC voltage DC, the sum of the lengths of the first section 112a, the diode 112c and the second section 112b of the reflection unit 112 is at least the length of the dipole antenna 111 One-half of the wavelength corresponding to the operating frequency. However, the present invention does not therefore limit the total length of the reflection unit 112 .

The first radio frequency choke unit 113 and the second radio frequency choke unit 114 allow the DC voltage DC to pass through, but do not allow the current generated by the radio frequency signal RF to pass through the first radiating portion 111 a and the second radiating portion 111 b of the dipole antenna 111 . The first RF choke unit 113 and the second RF choke unit 114 are transmitted to the reflection unit 112 . Each of the first radio frequency choke unit 113 and the second radio frequency choke unit 114 may include at least one radio frequency choke element, and the radio frequency choke element is, for example, an inductor, but the invention is not limited thereto. The number of inductors shown in FIG. 2 is for illustration only, and is not intended to limit the present invention.

Besides, the above-mentioned smart antenna may further include a coaxial cable 4 (shown in FIG. 3 ), the coaxial cable is used for electrically connecting the third end of the T-type bias circuit 12 and the dipole antenna 111 Therefore, the coaxial cable 4 can be used as the signal source 111 a of the dipole antenna 111 , so that the T-type bias circuit 12 can feed the radio frequency signal RF and the DC voltage DC to the dipole antenna 111 . The setting position of the smart antenna 11 can be easily changed by using the feeding method of the coaxial cable 4, thereby increasing the flexibility of use of the smart antenna.

Please refer to FIG. 2 and FIG. 3 at the same time. FIG. 3 is a schematic diagram of implementing the smart antenna of FIG. 2 on a microwave substrate. In the embodiment of FIG. 3 , the first radiating portion 111 a and the second radiating portion 111 b of the dipole antenna 111 , the first end 112 a and the second end 112 b of the reflection unit 112 can be fabricated on the microwave substrate 20 by etching technology. The microwave substrate 20 is, for example, a printed circuit board (PCB), but the present invention is not limited thereto. The coaxial cable 4 has a feed end and a ground end, the feed end is electrically connected to the feed point f1 of the first radiating portion 111a, and the ground end is electrically connected to the feed point f2 of the second radiator portion 111b. On the other hand, the coaxial cable 4 is also electrically connected to the aforementioned T-type bias circuit 12, so that the feeding end of the coaxial cable 4 is electrically connected to the third end of the T-type bias circuit 12 and the dipole Between the first radiating portion 111 a of the antenna 111 , the ground end of the coaxial cable 4 is electrically connected between the second radiating portion 111 b of the dipole antenna 111 and the system ground, which is the ground of the wireless communication device 1 . Grounding (ie, grounding of the system circuit board where the T-type bias circuit 12, the DC voltage supply unit 13 and the wireless module 14 of FIG. 1 are provided).

The first RF choke unit 113 , the second RF choke unit 114 and the diode 112c can be surface mount components (SMD) and are connected to the conductive contact terminals of the microwave substrate 20 by a surface mount process, but the present invention is not limited thereto. . Continuing to refer to FIG. 3 , the first radio frequency choke unit 113 includes a first radio frequency choke assembly 1131 and a second radio frequency choke assembly 1132 connected in series with each other. The first RF choke element 1131 and the second RF choke element 1132 can be directly connected by wires 21, and the wires 21 can also be fabricated on the microwave substrate 20 by etching technology. The first radio frequency choke assembly 1131 is directly connected to the first radiation portion 111 a , and the second radio frequency choke assembly 1132 is directly connected to the first section 112 a of the reflection unit 112 . In one embodiment, the first RF choke element 1131 is preferably disposed close to the edge of the first radiation portion 111 a, and the second radio frequency choke element 1132 is preferably disposed close to the first radiating portion 111 a. edge of end 112a. The second radio frequency choke unit 114 includes a third radio frequency choke assembly 1141 and a fourth radio frequency choke assembly 1142 connected in series with each other. The third RF choke element 1141 and the fourth RF choke element 1142 can be directly connected by wires 22, and the wires 22 can also be fabricated on the microwave substrate 20 by etching technology. The third radio frequency choke assembly 1141 is directly connected to the second radiation portion 111 b , and the fourth radio frequency choke assembly 1142 is directly connected to the second section 112 b of the reflection unit 112 . In one embodiment, the third RF choke element 1141 is preferably disposed close to the edge of the second radiation portion 111 b , and the fourth radio frequency choke element 1142 is preferably disposed close to the second radiating portion 112 . The edge of the segment 112b, but the present invention is not limited thereto.

Next, please refer to FIG. 2 and FIG. 4 at the same time. FIG. 4 is a radiation pattern diagram of the diode of the reflection unit of the smart antenna of FIG. 2 in a non-conducting state. When the direct current voltage DC is zero voltage, the diode 112c is non-conductive. The dipole antenna 111 is a half-wavelength dipole antenna, and its radiation pattern on the X-Y plane is approximately isotropic radiation in the frequency range of 5150MHz, 5450MHz to 5850MHz. Please refer to FIG. 5 again. FIG. 5 is a radiation pattern diagram of the diode of the reflection unit of the smart antenna of FIG. 2 in a conducting state. When the DC voltage DC is a positive voltage (eg +3V), and the voltage is large enough to make the diode 112c conduct, in the angle representation in FIG. 5, an angle of 0 degrees is the +X direction, and a positive angle of 90 degrees is the +Y direction, then It can be seen from Figure 5 that its radiation pattern on the X-Y plane changes to radiate to the left (negative Y direction is negative 90 degrees). In another embodiment, according to the above design concept, the reflection unit 112 in FIG. 2 can be reconfigured to the left side of the dipole antenna 111 , so that the effect of the radiation pattern switching will be just opposite.

Based on the design concept of the embodiment in FIG. 2 , the embodiment of adding two reflection units can be seen in FIG. 6 . Compared with the antenna in FIG. 2 , the antenna in FIG. Streaming units 316, 317. In detail, the smart antenna of FIG. 6 includes a dipole antenna 311 , a reflection unit 312 , a reflection unit 315 , a first diode 312 c , a second diode 315 c and radio frequency choke units 313 , 314 , 316 and 317 . The reflection unit 312 and the reflection unit 315 are respectively disposed on the first side and the second side of the dipole antenna 311 . As shown in FIG. 6 , the reflection unit 312 is arranged on the right side of the dipole antenna 311 , and the reflection unit 315 is arranged at the left side of the dipole antenna 311 , but the present invention is not limited thereto. The relationship between the first side where the reflection unit 312 is located and the second side where the reflection unit 315 is located can be set in a three-dimensional space, and the first side and the second side are not necessarily on the same plane.

The dipole antenna 311 has a first radiation portion 311a and a second radiation portion 311b. The anode of the first diode 312c is connected to one end of the first section 312a of the reflection unit 312 , and the cathode of the first diode 312c is connected to one end of the second section 312a of the reflection unit 312 . The RF choke unit 313 is electrically connected between the first radiation portion 311 a and the first segment 312 a of the reflection unit 312 , and the RF choke unit 314 is electrically connected between the second radiation portion 311 b and the second segment of the reflection unit 312 312b. The reflection unit 315 has a third section 315a and a fourth section 315b, the cathode of the second diode 315c is connected to one end of the third section 315a of the reflection unit 315, and the anode of the second diode 315c is connected to the reflection unit 315. One end of the fourth section 315b. The RF choke unit 316 is electrically connected between the first radiation portion 311 a and the third section 315 a of the reflection unit 315 , and the RF choke unit 317 is electrically connected between the second radiation portion 311 b and the fourth section of the reflection unit 315 315b. In a preferred embodiment, the respective distances of the reflection units 312 and 315 from the dipole antenna 311 are between one eighth (0.125λ) to one quarter (0.25) of the wavelength corresponding to the operating frequency of the dipole antenna 311 λ), and the total length of the reflection units 312 and 315 (when the diodes are turned on) is at least half of the wavelength corresponding to the operating frequency of the dipole antenna 311, but the invention is not limited thereto.

When the DC voltage DC is zero voltage, the first diode 312c and the second diode 315c are both non-conductive. At this time, the radiation pattern of the smart antenna in FIG. 6 is approximately isotropic radiation in the X-Y plane. See Figure 7. When the DC voltage DC is a positive voltage and the first diode 312c is turned on (the second diode 315c is not turned on at this time), the radiation pattern in the X-Y plane changes to radiate to the left (negative Y direction) , refer to Figure 8. When the DC voltage DC is a negative voltage and the second diode 315c is turned on (the first diode 312c is not turned on at this time), the radiation pattern in the X-Y plane changes to radiate toward the right (positive Y direction) , refer to Figure 9. According to the above design concept, in another embodiment, the first diode 312c of the reflection unit 312 and the second diode 315c of the reflection unit 315 in FIG. 6 can be exchanged, so that the radiation pattern switching effect will be just opposite.

Further, the shape of the dipole antenna used in the embodiment of the present invention is not limited. For example, the two radiating parts of the dipole antenna may be trapezoidal, as shown in FIG. 10 , but the present invention is not limited thereto. Each of the two radiating portions of the dipole antenna may also have at least one bend, or have other shapes.

Referring to FIG. 1 again, when the smart antenna of the embodiment of the present invention is applied to a wireless communication device, the DC voltage supply unit 13 is used to control the switching of the radiation pattern of the smart antenna 11, and the conduction of the diode of each reflection unit is determined by A DC voltage determines that when two reflective units are used (as in the design of Figure 6), two DC voltages may be required to determine the respective conduction of the two diodes. Please refer to FIG. 11 together. FIG. 11 is a circuit diagram of the decoder 132 of the DC voltage supply unit 13 of FIG. 1 . The decoder 132 of FIG. 11 can be applied to, for example, the design of the smart antenna with two reflection units of FIG. 6 . However, the present invention is not limited thereby. The decoder 13 of FIG. 1 includes two single-pole double-throw (SPDT) switches S1 and S2, and the control unit 131 of FIG. 1 generates control signals, such as parallel (ie, parallel) signals Bit1-1 and Bit1-2 respectively control the single-pole Double throw switches S1, S2. The SPDT switch S1 receives two non-zero DC voltages, which are a positive voltage +Vdd and a negative voltage -Vdd. The SPDT switch S1 is controlled by the parallel signal Bit1-1 to determine the output positive voltage +Vdd or negative voltage -Vdd to SPDT switch S2. SPDT switch S2 receives DC voltage (+Vdd or -Vdd) and zero voltage (ground, 0V) from SPDT switch S1, SPDT switch S2 is controlled by parallel signal Bit1-2 to determine output zero voltage Or the DC voltage (+Vdd or -Vdd) from the SPDT switch S1 to the T-bias circuit 12 .

Further, the embodiment in which the wireless communication device in FIG. 1 uses one smart antenna can be extended to an embodiment in which multiple (two or more) smart antennas are used. Referring to FIG. 12 , a plurality of DC voltages (DC1, DC2...DCn) to control the radiation pattern switching of the plurality of smart antennas 551, 552...55n, so as to adjust the overall radiation pattern of the entire smart antenna system. As shown in FIG. 12 , based on the design concept of FIG. 1 , the DC voltage supply unit is implemented with a control unit 51 , a serial-parallel converter 52 and a plurality of decoders 531 , 532 . . . 53n . The control unit 51 is electrically connected to the serial-parallel converter 52 , and transmits serial control signals (including data data and clock) to the serial-parallel converter 52 . The serial-parallel converter 52 is electrically connected to the decoders 531 , 532 . . . 53n , and converts the serial control signals into parallel control signals to control the decoders 531 , 532 . . . 53n respectively. The decoders 531, 532...53n are electrically connected to the T-bias circuits 541, 542...54n, respectively, to output corresponding DC voltages DC1, DC2...DCn. The T-bias circuit 541 transmits the radio frequency signal RF1 and the DC voltage DC1 to the smart antenna 551 . The T-bias circuit 542 transmits the radio frequency signal RF2 and the DC voltage DC2 to the smart antenna 552 . By analogy, the T-bias circuit 54n transmits the radio frequency signal RFn and the DC voltage DCn to the smart antenna 55n. The radiation pattern of each of the smart antennas 551 , 552 . . . 55n can be controlled by the corresponding DC voltages DC1 , DC2 . . . DCn, thereby facilitating the control of the overall radiation pattern.

To sum up, the smart antenna and the wireless communication device with the smart antenna provided by the embodiments of the present invention can use the T-type bias circuit to combine the DC voltage and the radio frequency signal, and use the voltage control diode to adjust the reflection unit. The electrical length makes it form the design concept of a reflector, thereby realizing a smart antenna. The smart antenna design of the embodiment of the present invention can control the radiation direction of the antenna, is easy to implement, has low cost, and has a small size of the antenna. The effect of the wireless communication device product using the smart antenna according to the embodiment of the present invention can be configured in different radiation directions of the antenna than that of the known product, and the gain can be enhanced by more than 2dB. In addition, by integrating the switching element (diode) with the antenna and using the coaxial cable feeder, the smart antenna can be easily installed in any required (or possible) position of the wireless communication device, improving product design and use. flexibility.

The above descriptions are merely embodiments of the present invention, which are not intended to limit the patent scope of the present invention.

Claims (10)

1. A smart antenna comprising: a dipole antenna, the dipole antenna has a first radiating part and a second radiating part, the first radiating part is used for feeding a radio frequency signal and a DC voltage at the same time; a first reflection unit, the first reflection unit has a first section and a second section, and is disposed parallel to a first side of the dipole antenna; a first diode, the first diode is electrically connected between the first section and the second section, and the DC voltage is used to control the conduction state of the first diode; a first radio frequency choke unit, the first radio frequency choke unit is electrically connected between the first radiation part and the first section of the first reflection unit; a second radio frequency choke unit, the second radio frequency choke unit is electrically connected between the second radiation portion and the second section of the first reflection unit; and a coaxial cable, the coaxial cable has a feed-in end and a ground end, the feed-in end is electrically connected to the first radiating part, the ground end is electrically connected to the second radiating part, wherein the coaxial cable is The cable simultaneously feeds the radio frequency signal and the DC voltage to the first radiation portion of the dipole antenna. 2 . The smart antenna of claim 1 , further comprising a second reflection unit and a second diode, wherein the first reflection unit is disposed parallel to the first side of the dipole antenna, and the first The anode of the diode is electrically connected to one end of the first section of the first reflection unit, and the cathode of the first diode is electrically connected to one end of the second section of the first reflection unit, wherein the first Two reflecting units are arranged in parallel on a second side of the dipole antenna, the second reflecting unit has a third section and a fourth section, and the cathode of the second diode is electrically connected to the second reflecting unit One end of the third section of the second diode is electrically connected to one end of the fourth section of the second reflection unit. 3. The smart antenna of claim 1, wherein the first RF choke unit comprises a first RF choke element and a second RF choke element connected in series with each other, the first RF choke element being directly connected The first radiation part, the second RF choke element is directly connected to the first section of the first reflection unit; wherein the second RF choke unit includes a third RF choke element and a fourth RF choke element connected in series with each other A radio frequency choke assembly, the third radio frequency choke assembly is directly connected to the second radiation portion, and the fourth radio frequency choke assembly is directly connected to the second section of the first reflection unit. 4 . The smart antenna of claim 1 , wherein when the first diode is turned on under the control of the DC voltage, the first section of the first reflection unit, the first diode The sum of the lengths of the second section is at least half the wavelength corresponding to the operating frequency of the dipole antenna. 5 . The smart antenna of claim 1 , wherein the distance between the first reflection unit and the dipole antenna is between one eighth to one quarter of the wavelength corresponding to the operating frequency of the dipole antenna. 6 . 6. A wireless communication device comprising: T-type bias circuit, the T-type bias circuit has a first end, a second end and a third end, the first end of the T-type bias circuit receives a radio frequency signal, the T-type bias circuit The second end of the receiving DC voltage; a DC voltage supply unit, the DC voltage supply unit is electrically connected to the second end of the T-type bias circuit to generate the DC voltage; a dipole antenna, the dipole antenna has a first radiating part and a second radiating part, the first radiating part is used for feeding a radio frequency signal and a DC voltage at the same time; a coaxial cable, the coaxial cable has a feed end and a ground end, the feed end is electrically connected to the third end of the T-type bias circuit and the first radiation of the dipole antenna between the two parts, the ground terminal is electrically connected between the second radiating part of the dipole antenna and a system ground, wherein the coaxial cable simultaneously feeds the radio frequency signal and the DC voltage to the dipole antenna the first radiation portion; a first reflection unit, the first reflection unit has a first section and a second section, and is disposed parallel to a first side of the dipole antenna; a first diode, the first diode is electrically connected between the first section and the second section, and the DC voltage is used to control the conduction state of the first diode; a first radio frequency choke unit, the first radio frequency choke unit is electrically connected between the first radiation part and the first section of the first reflection unit; and a second radio frequency choke unit, the second radio frequency choke unit is electrically connected between the second radiation part and the second section of the first reflection unit. 7. The wireless communication device according to claim 6, further comprising a second reflection unit, wherein the first reflection unit is disposed parallel to the first side of the dipole antenna, and the anode of the first diode is electrically One end of the first section of the first reflection unit is connected, and the cathode of the first diode is electrically connected to one end of the second section of the first reflection unit, wherein the second reflection unit is arranged parallel to the A second side of the dipole antenna, the second reflection unit has a third section and a fourth section, a cathode of a second diode is electrically connected to the third section of the second reflection unit At one end, the anode of the second diode is electrically connected to one end of the fourth section of the second reflection unit. 8. The wireless communication device of claim 6, wherein the first RF choke unit comprises a first RF choke element and a second RF choke element connected in series with each other, the first RF choke element being directly connected The first radiation part, the second RF choke element is directly connected to the first section of the first reflection unit; wherein the second RF choke unit includes a third RF choke element and a fourth RF choke element connected in series with each other A radio frequency choke assembly, the third radio frequency choke assembly is directly connected to the second radiation portion, and the fourth radio frequency choke assembly is directly connected to the second section of the first reflection unit. 9 . The wireless communication device according to claim 6 , wherein when the first diode is turned on under the control of the DC voltage, the first section and the first diode of the first reflection unit The sum of the lengths of the second section is at least half the wavelength corresponding to the operating frequency of the dipole antenna. 10 . The wireless communication device of claim 6 , wherein the distance between the first reflection unit and the dipole antenna is between one eighth to one quarter of a wavelength corresponding to an operating frequency of the dipole antenna. 11 .

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