Abstract: Disclosed is a substrate-integrated circularly polarized electromagnetic radiation structure. A plurality of connection points are provided between an upper metal radiation structure and a lower metal backplane; the upper metal radiation structure consists of a metal ring and two metal branches disposed within the metal ring; the metal branches are bent structures; the metal ring is a rectangular ring structure; the two metal branches are rotational symmetric by 180 degrees relative to a feeder center, and a serpentine structure composed of the two metal branches enables same to achieve circular polarization (comprising left-hand circular polarization and right-hand circular polarization) within broadband and to achieve beam directivity.

Abstract: Disclosed in the present invention is a filter circuit. A first PCB layer consists of a power line, a power interface, a second filter capacitor, and a first filter capacitor; the power line comprises a power supply network and a GND network; the second PCB layer is provided with a conductor plane; the power interface is connected to the GND network and is further connected to the conductor plane; the GND network, the second filter capacitor, and the conductor plane are sequentially connected; the power supply network, the first filter capacitor, and the conductor plane are sequentially connected. The circuit design of the circuit structure and the overall layout design idea in the present invention have a good suppression effect on common-mode noise, differential mode noise, radiation noise and conduction noise.

Abstract: Disclosed is a substrate-integrated circularly polarized electromagnetic radiation structure. A plurality of connection points are provided between an upper metal radiation structure and a lower metal backplane; the upper metal radiation structure consists of a metal ring and two metal branches disposed within the metal ring; the metal branches are bent structures; the metal ring is a rectangular ring structure; the two metal branches are rotational symmetric by 180 degrees relative to a feeder center, and a serpentine structure composed of the two metal branches enables same to achieve circular polarization (comprising left-hand circular polarization and right-hand circular polarization) within broadband and to achieve beam directivity.

Abstract: The invention relates to the technical field of wireless sensing, in particular to a non-contact breathing or heartbeat detection method, which comprises the following steps: S1, acquiring channel state information of a wireless signal according to an output wireless signal and a wireless signal reflected by a measured target; S2, extracting a vital sign waveform signal from the channel state information of the wireless signal; S3, performing filtering on the vital sign waveform signal based on Huber-Kalman filtering algorithm to obtain the filtered vital sign waveform signal; S4, extracting vital sign parameters from the filtered vital sign waveform signal. In the method, the Huber objective function is used to improve the classical Kalman filtering algorithm, and the Huber-Kalman filtering algorithm is used for filtering processing, so that the human vital sign detection method is more robust, and the extracted vital sign parameters can reflect the human vital signs more accurately.