Patent ID: 11876544
Assignee: NANJING CONGJING BIOTECHNOLOGY CO., LTD
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A two-group portable same-frequency or different-frequency control radio frequency circuit, comprising two groups of radio frequency circuits and a control circuit (300) for controlling the two groups of radio frequency circuits, wherein each group of radio frequency circuit comprises a power filter circuit (1), a quartz crystal oscillator (2), a harmonic suppression circuit (3), an input end bias circuit (4), an input matching inductor (5), an amplifier (6), an output end bias circuit (7), an output matching circuit (8), a detection circuit (9), an antenna matching circuit (10), and an antenna (11);
the power filter circuit (1) is electrically connected to the quartz crystal oscillator (2); the power filter circuit (1) includes a current limiting resistor R8, a sixteenth capacitor C16, a seventeenth capacitor C17, and an eighteenth capacitor C18; an output end of the current limiting resistor R8 is connected to a power input end VCC of the quartz crystal oscillator (2); one end of the sixteenth capacitor C16, one end of the seventeenth capacitor C17, and one end of the eighteenth capacitor C18 are electrically connected to the output end of the current limiting resistor R8; the other end of the sixteenth capacitor C16, the other end of the seventeenth capacitor C17, and the other end of the eighteenth capacitor C18 are all grounded; the sixteenth capacitor C16, the seventeenth capacitor C17, and the eighteenth capacitor C18 filter out ripples with different frequencies in power and provide small-ripple and stable power for the quartz crystal oscillator (2); the quartz crystal oscillator (2) is electrically connected to the harmonic suppression circuit (3), and the quartz crystal oscillator (2) is used for generating a stable frequency for the circuit; the harmonic suppression circuit (3) is electrically connected to the input matching inductor (5), and the harmonic suppression circuit (3) is used for filtering out unnecessary frequency components for the circuit; the harmonic suppression circuit (3) comprises an eleventh capacitor C11, a twelfth capacitor C12, a nineteenth capacitor C19, a second inductor L2, and a third inductor L3; the eleventh capacitor C11, the second inductor L2, the third inductor L3, and the twelfth capacitor C12 are connected in series; one end of the nineteenth capacitor C19 is electrically connected to an output end of the second inductor L2, and the other end of the nineteenth capacitor C19 is grounded; an input end of the eleventh capacitor C11 is connected to the output end of the quartz crystal oscillator (2), and an output end of the twelfth capacitor C12 is connected to an input end of the input matching inductor (5); the input end bias circuit (4) is electrically connected to the harmonic suppression circuit (3), and the input end bias circuit (4) is used for providing a bias voltage for the amplifier (6) and playing a role in starting and regulating a power output; the input matching inductor (5) is electrically connected to the amplifier (6) to complete input impedance matching of the amplifier (6); the amplifier (6) is electrically connected to the output matching circuit (8); the amplifier (6) is used for amplifying a signal generated by the quartz crystal oscillator (2) to meet needs of the circuit; the output end bias circuit (7) is connected in parallel between the amplifier (6) and the output matching circuit (8) and is used for providing a suitable power supplying voltage for the amplifier (6), ensuring stable and reliable operations of the circuit; the output matching circuit (8) is electrically connected to the detection circuit (9), and the output matching circuit (8) is used for completing output impedance matching of the amplifier (6); the detection circuit (9) is electrically connected to the antenna matching circuit (10); the detection circuit (9) is used for performing incidence and reflection detection on the signal, and the signal is collected in the form of a direct current voltage output; the antenna matching circuit (10) is connected in series with the antenna (11) to complete impedance matching; the antenna (11) outputs the power generated by the amplifier (6); the output end bias circuit (7) comprises a first capacitor C1, a fourth capacitor C4, a fifth capacitor C5, a seventh capacitor C7, and a first inductor L1; one end of the first capacitor C1, one end of the fourth capacitor C4, one end of the fifth capacitor C5, and one end of the seventh capacitor C7 are connected to the first inductor L1, and the other end of the first capacitor C1, the other end of the fourth capacitor C4, the other end of the fifth capacitor C5, and the other end of the seventh capacitor C7 are grounded; an output end of the first inductor L1 is connected to the output matching circuit (8); the detection circuit (9) comprises a first detection diode J1, a second resistor R2, a second capacitor C2, a fourth resistor R4, a third capacitor C3, a second detection diode J2, a fifth resistor R5, a ninth capacitor C9, a sixth resistor R6, and a tenth capacitor C10; the first detection diode J1 and the fourth resistor R4 are connected in series in the circuit; one end of the second resistor R2 and one end of the second capacitor C2 are connected to an intersection point of the first detection diode J1 and the fourth resistor R4; the other end of the second resistor R2 and the other end of the second capacitor C2 are grounded; one end of the third capacitor C3 is connected to the fourth resistor R4, and the other end of the third capacitor C3 is grounded; the second detector diode J2 and the resistor R6 are connected in series in the circuit; one end of the resistor R5 and one end of the capacitor C9 are connected to an intersection point of the detection diode J2 and the sixth resistor R6; the other end of the fifth resistor R5 and the other end of the ninth capacitor C9 are grounded; one end of the tenth capacitor C10 is connected to the sixth resistor R6, and the other end of the tenth capacitor C10 is grounded; the antenna matching circuit (10) comprises a sixth inductor L6, a seventh inductor L7, and a fifteenth capacitor C15; the sixth inductor L6 is connected in series with the seventh inductor L7; one end of the fifteenth capacitor C15 is connected to the seventh inductor L7, and the other end of the fifteenth capacitor C15 is grounded; the antenna (11) comprises four copper rings; every two copper rings form a group of antenna emitters, and the corresponding antenna emitters are connected to the corresponding radio frequency circuits;
wherein the two groups of radio frequency circuits are switched by the control circuit (300) and then start to work in turn in a time-sharing manner, and frequencies of the two groups of radio frequency circuits are set as different frequencies for outputting, that is, working frequencies of the two groups of radio frequency circuits are set as different frequencies for outputting, including 40.68 MHz, 27.12 MHz, and 13.56 MHz.