Patent ID: 11936408
Assignee: LANSUS TECHNOLOGIES INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A matching circuit, comprising:
a first impedance matcher;
a first bandpass filter;
a first wave trap; and
a first matching unit;
wherein an impedance of the first impedance matcher is a first preset impedance at a first frequency, the first bandpass filter is bridged between a front end of the first impedance matcher and ground, the first bandpass filter enables a signal of the first frequency to pass through, and suppresses at least one of a signal of a second frequency and a first harmonic signal of the signal of the first frequency; and the second frequency is lower than the first frequency;
the first bandpass filter comprises a first resonator and a second resonator, the first resonator and the second resonator are connected in series;
the first resonator comprises a first inductor and a first capacitor, the first inductor and the first capacitor are connected in parallel;
the second resonator comprises a second inductor and a second capacitor, the second inductor and the second capacitor are connected in series;
the first wave trap is bridged between a rear end of the first impedance matcher and the ground, to suppress a second harmonic signal of the signal of the first frequency;
the first matching unit is connected to the front end of the first impedance matcher;
the first matching unit comprises a third inductor, a fourth inductor, a fifth inductor, and a third capacitor, the third inductor, the fourth inductor, the fifth inductor, and the third capacitor are connected in series;
the first matching unit further comprises a sixth inductor, a seventh inductor, an eighth inductor, a fourth capacitor, a fifth capacitor, and a sixth capacitor;
the sixth inductor and the fourth capacitor are connected in series, and are bridged between a connection point, of the third inductor and the fourth inductor, and the ground;
the seventh inductor and the fifth capacitor are connected in series, and are bridged between a connection point, of the fourth inductor and the fifth inductor, and the ground;
the eighth inductor and the sixth capacitor are connected in series, and are bridged between a connection point, of the fifth inductor and the third capacitor, and the ground;
the first frequency is within a working frequency band ranged from 1.710 GHz-1.785 GHz and/or 1.850 GHz-1.910 GHz; and
the second frequency is within a frequency band ranged from 820 MHz-920 MHz.