Communication antenna radio frequency circuit assembly with optimized anti-interference filtering

Abstract

The utility model relates to the technical field of communication antennas, and discloses an anti-interference filtering optimized communication antenna radio frequency circuit assembly, comprising a radio frequency amplifier responsible for amplifying an input radio frequency signal; the radio frequency mixer is used for mixing the signals with different frequencies and generating a new frequency; the radio frequency filter is used for suppressing out-of-band interference signals and allowing target frequency band signals to pass through; the radio frequency switch is used for controlling the on-off state of the radio frequency signal; the radio frequency antenna is used for converting radio frequency signals into electromagnetic waves for transmission, or receiving external electromagnetic waves and converting the external electromagnetic waves into radio frequency signals for processing; according to the utility model, the anti-interference capability, the signal gain and power, the filtering performance and the flexibility of a signal path of the radio frequency circuit assembly of the communication antenna are obviously improved, the radio frequency circuit assembly can work stably in an electromagnetic environment of a load, and high-quality communication service is provided.

Description

Technical Field

[0001] This utility model relates to the field of communication antenna technology, specifically to a communication antenna radio frequency circuit component with optimized anti-interference filtering. Background Technology

[0002] Communication antennas are a key component of wireless communication systems, responsible for converting radio waves into electrical signals or vice versa, thereby enabling wireless information transmission. Radio frequency (RF) circuits are another important part of wireless communication systems, responsible for processing RF signals and performing functions such as modulation, demodulation, amplification, and filtering.

[0003] A search revealed that patent application number CN202121681718.3 discloses an antenna radio frequency circuit, a communication module, and a terminal device. The antenna radio frequency circuit includes an input terminal and an output terminal, a signal detection circuit, at least two parallel filtering circuits, and a first switch. The signal detection circuit is connected between the input terminal and the output terminal to detect whether the antenna carrier signal contains interference signals and the frequency band of the interference signals. Various filtering circuits are used to filter out interference signals in their corresponding frequency bands. The first switch is located between the input terminal and the output terminal in each path through the various filtering circuits, selectively connecting the path through one of the filtering circuits and disconnecting the path through the remaining filtering circuits. This application allows for the connection of appropriate filtering circuits based on the actual situation of the interference signals, which helps reduce insertion loss.

[0004] Current communication antenna RF circuits suffer from insufficient signal strength and signal loss during transmission, as well as poor anti-interference capabilities. Furthermore, RF signals are not easily converted or modulated during transmission, preventing transmission and processing on different frequency bands. Therefore, we need to propose communication antenna RF circuit components with optimized anti-interference filtering. Utility Model Content

[0005] The purpose of this invention is to provide a communication antenna RF circuit component with optimized anti-interference filtering, which significantly improves the anti-interference capability, signal gain and power, filtering performance and signal path flexibility of the communication antenna RF circuit component, and can work stably in the electromagnetic environment of the load, providing high-quality communication services, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a communication antenna RF circuit assembly with optimized anti-interference filtering, comprising:

[0007] A radio frequency amplifier is responsible for amplifying the input radio frequency signal;

[0008] Radio frequency mixers are used to mix signals of different frequencies and generate new frequencies.

[0009] Radio frequency filters that suppress out-of-band interference signals and allow signals in the target frequency band to pass through;

[0010] Radio frequency switches used to control the switching state of radio frequency signals;

[0011] Radio frequency antennas are used to convert radio frequency signals into electromagnetic waves for transmission, or to receive external electromagnetic waves and convert them into radio frequency signals for processing.

[0012] The RF amplifier, RF mixer, RF filter, RF switch, and RF antenna are connected in sequence.

[0013] Preferably, the RF amplifier includes transistors Q1 and Q2. Inductors L2, L1, L3, and L5 are connected in series between the collectors of transistors Q1 and Q2. Resistor R1, capacitor C2, and a series-connected ferrite bead F1 and capacitor C1 are connected to the base of transistor Q1. Capacitors C10 and C12 are connected to the connection terminals of inductors L2 and L1, respectively. Resistor R1 is connected to the connection terminals of inductors L2 and L1.

[0014] Preferably, the emitter of transistor Q1 is connected to a resistor R2 and a capacitor C3 connected in parallel, the collector of transistor Q1 is connected in series with capacitors C4 and C5, the terminals of capacitors C4 and C5 are connected to the base of transistor Q2 with an inductor L4, the base of transistor Q2 is connected to a ferrite bead F2, and the collector of transistor Q2 is connected in series with an inductor L6, a capacitor C6, and a capacitor C7.

[0015] Preferably, the RF mixer includes a chip U1, connector P1, connector P2, connector P3, transistor N1, and transformer T1. A capacitor C12 is connected between pin 1 of connector P1 and pin 3 of chip U1. A capacitor C32 is connected between pin 1 of connector P3 and pin 6 of chip U1. A resistor R5, an inductor L12, and a capacitor C62 are connected in series between pin 2 of chip U1 and the base of transistor N1.

[0016] Preferably, the emitter of transistor N1 is connected to a resistor R9 and a capacitor C82 connected in parallel; the collector of transistor N1 is connected to pin 1 of transformer T1; a capacitor C52 is connected between pins 1 and 3 of transformer T1; a resistor R7 is connected between pin 2 of transformer T1 and the base of transistor N1; a capacitor E3 and a capacitor C42 are connected in parallel to pin 2 of transformer T1; and pin 4 of transformer T1 is connected to pin 1 of connector P2.

[0017] Preferably, the RF filter includes comparator U1A and comparator U1B. A capacitor C23 and a series resistor R13 and resistor R23 are connected to pins 2 and 3 of comparator U1A, respectively. A capacitor C13 is connected between the terminals of resistors R13 and R23 and pin 3 of comparator U1A. A resistor R43 and a capacitor C33 are connected in series between pins 2 and 3 of comparator U1B. A resistor R33 is connected between pin 3 of comparator U1A and the terminals of resistors R43 and capacitor C33.

[0018] Preferably, the RF switch includes MOSFETs Q6, Q7, and Q8. Pin 1 of MOSFET Q6 is connected to a capacitor C137 and a resistor R105 connected in parallel. Pin 1 of MOSFET Q7 is connected to a resistor R107 and a capacitor C139 connected in parallel. Pin 1 of MOSFET Q8 is connected to a resistor R112 and a capacitor C146 connected in parallel. Pin 3 of MOSFET Q6 is connected to pin 3 of MOSFET Q8. Pin 3 of MOSFET Q7 is connected to one end of resistor R105.

[0019] Preferably, the radio frequency antenna includes a chip U15. Pin 1 of the chip U15 is connected to an inductor L15 and a resistor R15 in series, and a capacitor C35 and an inductor L25 in series. Pin 6 of the chip U15 is connected to a resistor R25. A capacitor C15 and a capacitor C25 are connected in parallel between the resistor R15 and the resistor R25. A crystal oscillator Y1 is connected between pins 4 and 5 of the chip U15. A capacitor C65 and a capacitor C55 are connected between the two ends of the crystal oscillator Y1.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This utility model, through the design of radio frequency amplifier and radio frequency filter, can amplify the power of the transmitted signal, so that the signal has sufficient strength during transmission, overcome transmission loss and interference, filter out unwanted frequency band components, suppress radio frequency interference signals, retain the required communication signal, reduce signal interference, and improve the anti-interference capability of the communication antenna.

[0022] 2. This utility model achieves frequency conversion and signal modulation through the design of an RF mixer, enabling the communication antenna to operate on different frequency bands and adapt to different signal formats;

[0023] 3. This utility model, through the design of an RF switch, allows for switching between different RF signals, enabling flexible signal allocation, optimizing power usage, and reducing interference. Attached Figure Description

[0024] Figure 1 This is the circuit diagram of the radio frequency amplifier of this utility model;

[0025] Figure 2 This is a circuit diagram of the radio frequency mixer of this utility model;

[0026] Figure 3 This is the circuit diagram of the radio frequency filter of this utility model;

[0027] Figure 4 This is the circuit diagram of the radio frequency switch of this utility model;

[0028] Figure 5 This is the circuit diagram of the radio frequency antenna of this utility model. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-5 This utility model provides a technical solution: an anti-interference filtering optimized communication antenna radio frequency circuit assembly, comprising:

[0031] A radio frequency amplifier is responsible for amplifying the input radio frequency signal;

[0032] The RF amplifier includes transistors Q1 and Q2. Inductors L2, L1, L3, and L5 are connected in series between the collectors of transistors Q1 and Q2. Resistor R1, capacitor C2, and a series-connected ferrite bead F1 and capacitor C1 are connected to the base of transistor Q1. Capacitors C10 and C12 are connected to the connection terminals of inductors L2 and L1, respectively. Resistor R1 is connected to the connection terminals of inductors L2 and L1.

[0033] The emitter of transistor Q1 is connected to a resistor R2 and a capacitor C3 in parallel. The collector of transistor Q1 is connected in series with capacitors C4 and C5. The terminals of capacitors C4 and C5 are connected to the base of transistor Q2 with an inductor L4. The base of transistor Q2 is connected to a ferrite bead F2. The collector of transistor Q2 is connected in series with an inductor L6, a capacitor C6, and a capacitor C7.

[0034] Transistors Q1 and Q2 are used as amplifying devices for signal amplification. Capacitors C120 and C130 are used to remove high-frequency and low-frequency noise from the power supply. Capacitors C4, C5, C6, and C7 are used in the tuning circuit to adjust the resonant frequency of the circuit. Inductors L1-L6 and capacitors form an LC resonant circuit for frequency selection and impedance matching. Resistors R1 and R2 are used to set the bias voltage of transistors Q1 and Q2. Ferrite beads F1 and F2 are used to suppress high-frequency noise and prevent high-frequency signals from passing through.

[0035] The input signal passes through capacitor C1 and ferrite bead F1 and enters the first-stage amplifier circuit composed of transistor Q1. The appropriate bias is set by resistors R1 and R2 so that transistor Q1 operates in the amplification region. The amplified signal is then frequency-selected and impedance-matched by an LC network before entering the second-stage amplifier circuit composed of transistor Q2. After further amplification and processing by the LC network at the output end, the signal is output.

[0036] Radio frequency mixers are used to mix signals of different frequencies and generate new frequencies.

[0037] The radio frequency mixer includes a chip U1, connectors P1, P2, and P3, a transistor N1, and a transformer T1. A capacitor C12 is connected between pin 1 of connector P1 and pin 3 of chip U1. A capacitor C32 is connected between pin 1 of connector P3 and pin 6 of chip U1. A resistor R5, an inductor L12, and a capacitor C62 are connected in series between pin 2 of chip U1 and the base of transistor N1.

[0038] The emitter of transistor N1 is connected to a resistor R9 and a capacitor C82 connected in parallel. The collector of transistor N1 is connected to pin 1 of transformer T1. A capacitor C52 is connected between pins 1 and 3 of transformer T1. A resistor R7 is connected between pin 2 of transformer T1 and the base of transistor N1. A capacitor E3 and a capacitor C42 are connected in parallel to pin 2 of transformer T1. Pin 4 of transformer T1 is connected to pin 1 of connector P2.

[0039] Chip U1 mixes the input RF signal with the local oscillator signal to generate an intermediate frequency (IF) signal. The capacitors in the RF mixer are used for coupling, filtering, and blocking DC while allowing AC. Resistors R4 and R5 are used to set the bias voltage and limit current. Resistor R5, along with resistors R4 and R6, performs voltage division and impedance matching on the mixer's output signal. Inductor L12 is used for signal filtering and impedance matching. Transistor N1 amplifies the processed IF signal. Transformer T1 is used for signal coupling and impedance transformation to achieve IF signal output matching.

[0040] The RF input signal is coupled to the RF pin of chip U1 via connector P1 and capacitor C12. The local oscillator input signal is coupled to the LO pin of chip U1 via connector P3 and capacitor C32. Inside chip U1, the RF signal and the local oscillator signal are mixed to generate an intermediate frequency (IF) signal, which is output from the IF pin. The output IF signal passes through a voltage divider network composed of resistors R5, R4, and R6, and then through a filter network composed of inductor L12 and capacitors C62 and C72 to filter out noise. The filtered IF signal is amplified by transistor N1 and finally coupled to connector P2 via transformer T1 as the IF output signal.

[0041] Radio frequency filters that suppress out-of-band interference signals and allow signals in the target frequency band to pass through;

[0042] The radio frequency filter includes comparator U1A and comparator U1B. A capacitor C23 and a series resistor R13 and a resistor R23 are connected to pin 2 of comparator U1A, respectively. A capacitor C13 is connected between the terminals of resistor R13 and resistor R23 and pin 3 of comparator U1A. A resistor R43 and a capacitor C33 are connected in series between pin 2 and pin 3 of comparator U1B. A resistor R33 is connected between pin 3 of comparator U1A and the terminals of resistor R43 and capacitor C33.

[0043] Comparators U1A and U1B amplify and filter the input signal. Resistors R13 and R23 are used to set the gain and bias current of the operational amplifiers, and also act as voltage dividers and current limiters in the filter network. Capacitors C13 and C23, together with the resistors, form an RC filter network, which determines the filter's cutoff frequency and other characteristics.

[0044] Radio frequency switches used to control the switching state of radio frequency signals;

[0045] The RF switch includes MOSFETs Q6, Q7, and Q8. Pin 1 of MOSFET Q6 is connected to a capacitor C137 and a resistor R105 connected in parallel. Pin 1 of MOSFET Q7 is connected to a resistor R107 and a capacitor C139 connected in parallel. Pin 1 of MOSFET Q8 is connected to a resistor R112 and a capacitor C146 connected in parallel. Pin 3 of MOSFET Q6 is connected to pin 3 of MOSFET Q8. Pin 3 of MOSFET Q7 is connected to one end of resistor R105.

[0046] MOSFETs Q6, Q7, and Q8 are used as switching elements to control the on / off state of the signal path and switch between transmit (TX) and receive (RX) modes.

[0047] Capacitors C134 and C135 serve as filters and decouplers. Capacitors C134, C135, and C136 form a filter network to remove high-frequency noise from the power supply. Control signals TX_EN (transmit enable) and RX_EN (receive enable) switch the circuit's operating mode by controlling the on / off state of MOSFETs Q7 and Q8.

[0048] When the TX_EN signal is high, MOSFET Q7 is turned on and MOSFET Q8 is turned off. At this time, the power supply provides power to the transmitting circuit (TX28) through MOSFET Q6, allowing the transmitting signal to pass through.

[0049] When the RX_EN signal is high, MOSFET Q8 is turned on and MOSFET Q7 is turned off. At this time, the receiving circuit is activated, the power supply to the transmitting circuit is cut off, and the received signal is allowed to enter the corresponding circuit.

[0050] Radio frequency antennas are used to convert radio frequency signals into electromagnetic waves for transmission, or to receive external electromagnetic waves and convert them into radio frequency signals for processing.

[0051] The radio frequency antenna includes a chip U15. Pin 1 of the chip U15 is connected to an inductor L15 and a resistor R15 in series, and a capacitor C35 and an inductor L25 in series. One end of the inductor L25 is connected to the antenna ANT and a capacitor C45. Pin 6 of the chip U15 is connected to a resistor R25. A capacitor C15 and a capacitor C25 are connected in parallel between the resistor R15 and the resistor R25. Pins 4 and 5 of the chip U15 are connected to a crystal oscillator Y1. A capacitor C65 and a capacitor C55 are connected between the two ends of the crystal oscillator Y1.

[0052] The antenna ANT is used to transmit and receive wireless radio frequency signals. Inductor L15, capacitor C25, and capacitor C15 form a power supply filter network to filter out high-frequency noise in the power supply VCC. Inductor L25, capacitor C35, and capacitor C45 form an LC matching network to achieve impedance matching between the antenna ANT and the chip U15, thereby improving signal transmission efficiency.

[0053] Crystal Y1, together with capacitors C65 and C55, provides a stable clock signal for the chip, ensuring the normal operation of the chip's internal circuitry.

[0054] The RF amplifier, RF mixer, RF filter, RF switch, and RF antenna are connected in sequence.

[0055] Radio frequency (RF) signals are first received or transmitted through an antenna and enter the RF circuit system. The RF amplifier amplifies the received signal to improve its strength and coverage. The RF mixer performs frequency conversion and modulation on the amplified signal, loading information onto the RF signal. The RF filter filters the modulated signal, removing unwanted frequency components and interference signals to improve signal quality. The RF switch switches and distributes the filtered signal as needed to achieve multi-channel communication and signal distribution. Finally, the processed signal is transmitted through the antenna or enters subsequent circuits for further processing.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A communication antenna RF circuit assembly with optimized anti-interference filtering, characterized in that, include: A radio frequency amplifier is responsible for amplifying the input radio frequency signal; Radio frequency mixers are used to mix signals of different frequencies and generate new frequencies. Radio frequency filters that suppress out-of-band interference signals and allow signals in the target frequency band to pass through; Radio frequency switches used to control the switching state of radio frequency signals; Radio frequency antennas are used to convert radio frequency signals into electromagnetic waves for transmission, or to receive external electromagnetic waves and convert them into radio frequency signals for processing. The RF amplifier, RF mixer, RF filter, RF switch, and RF antenna are connected in sequence.

2. The communication antenna RF circuit assembly with anti-interference filtering optimization according to claim 1, characterized in that: The RF amplifier includes transistors Q1 and Q2. Inductors L2, L1, L3, and L5 are connected in series between the collectors of transistors Q1 and Q2. Resistor R1, capacitor C2, and a series-connected ferrite bead F1 and capacitor C1 are connected to the base of transistor Q1. Capacitors C10 and C12 are connected to the connection terminals of inductors L2 and L1, respectively. Resistor R1 is connected to the connection terminals of inductors L2 and L1.

3. The communication antenna RF circuit assembly with anti-interference filtering optimization according to claim 2, characterized in that: The emitter of transistor Q1 is connected to a resistor R2 and a capacitor C3 in parallel. The collector of transistor Q1 is connected in series with capacitors C4 and C5. The terminals of capacitors C4 and C5 are connected to the base of transistor Q2 with an inductor L4. The base of transistor Q2 is connected to a ferrite bead F2. The collector of transistor Q2 is connected in series with an inductor L6, a capacitor C6, and a capacitor C7.

4. The communication antenna RF circuit assembly with anti-interference filtering optimization according to claim 1, characterized in that: The radio frequency mixer includes a chip U1, connectors P1, P2, and P3, a transistor N1, and a transformer T1. A capacitor C12 is connected between pin 1 of connector P1 and pin 3 of chip U1. A capacitor C32 is connected between pin 1 of connector P3 and pin 6 of chip U1. A resistor R5, an inductor L12, and a capacitor C62 are connected in series between pin 2 of chip U1 and the base of transistor N1.

5. The communication antenna RF circuit assembly with anti-interference filtering optimization according to claim 4, characterized in that: The emitter of transistor N1 is connected to a resistor R9 and a capacitor C82 connected in parallel. The collector of transistor N1 is connected to pin 1 of transformer T1. A capacitor C52 is connected between pins 1 and 3 of transformer T1. A resistor R7 is connected between pin 2 of transformer T1 and the base of transistor N1. A capacitor E3 and a capacitor C42 are connected in parallel to pin 2 of transformer T1. Pin 4 of transformer T1 is connected to pin 1 of connector P2.

6. The communication antenna RF circuit assembly with anti-interference filtering optimization according to claim 1, characterized in that: The radio frequency filter includes comparator U1A and comparator U1B. A capacitor C23 and a series resistor R13 and a resistor R23 are connected to pin 2 of comparator U1A, respectively. A capacitor C13 is connected between the terminals of resistor R13 and resistor R23 and pin 3 of comparator U1A. A resistor R43 and a capacitor C33 are connected in series between pin 2 and pin 3 of comparator U1B. A resistor R33 is connected between pin 3 of comparator U1A and the terminals of resistor R43 and capacitor C33.

7. The communication antenna RF circuit assembly with anti-interference filtering optimization according to claim 1, characterized in that: The RF switch includes MOSFETs Q6, Q7, and Q8. Pin 1 of MOSFET Q6 is connected to a capacitor C137 and a resistor R105 connected in parallel. Pin 1 of MOSFET Q7 is connected to a resistor R107 and a capacitor C139 connected in parallel. Pin 1 of MOSFET Q8 is connected to a resistor R112 and a capacitor C146 connected in parallel. Pin 3 of MOSFET Q6 is connected to pin 3 of MOSFET Q8. Pin 3 of MOSFET Q7 is connected to one end of resistor R105.

8. The communication antenna RF circuit assembly with anti-interference filtering optimization according to claim 1, characterized in that: The radio frequency antenna includes a chip U15. Pin 1 of the chip U15 is connected to an inductor L15 and a resistor R15 in series, and a capacitor C35 and an inductor L25 in series. Pin 6 of the chip U15 is connected to a resistor R25. A capacitor C15 and a capacitor C25 are connected in parallel between the resistor R15 and the resistor R25. A crystal oscillator Y1 is connected between pins 4 and 5 of the chip U15. A capacitor C65 and a capacitor C55 are connected between the two ends of the crystal oscillator Y1.

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