Abstract: A four-notch flexible wearable ultra-wideband antenna fed by coplanar waveguide, includes a flexible base. A ground plane, a radiation patch and a feeder are arranged on the flexible base. There are several resonant tanks on the feeder and the radiation patch. The flexible base is made of insulating flexible material, and the feeder, the radiation patch and the ground plane are made of conductive flexible material. The four-notch flexible wearable ultra-wideband antenna fed by coplanar waveguide of the present application can be prepared by layer-by-layer assembly technology, spray printing or printed circuit board technology, and has the advantages of miniaturization and low profile, compact structure, convenient production, good conformality, wearable and other advantages.

Abstract: The disclosure provides an electronic device with a Universal Serial Bus (USB) interface and a method for starting USB communication for a USB interface, so as to solve the problem that a mobile phone terminal device can be damaged easily when a charger shares one interface with USB communication in the conventional art. A control pin of the control circuit of the device is connected with a VCHG pin of a power management chip; an output pin of the control circuit is connected with a USB_VBUS pin of a USB interface chip; a power pin of the control circuit is connected with a fixed voltage input end which inputs a high level; and the control circuit is configured to output a fixed voltage from the output pin of the control circuit when detecting that the voltage of the control pin is more than a set threshold and output a low level from the output pin of the control circuit when detecting that the voltage of the control pin is less than the set threshold.

Abstract: The disclosure provides an electronic device with a Universal Serial Bus (USB) interface and a method for starting USB communication for a USB interface, so as to solve the problem that a mobile phone terminal device can be damaged easily when a charger shares one interface with USB communication in the conventional art. A control pin of the control circuit of the device is connected with a VCHG pin of a power management chip; an output pin of the control circuit is connected with a USB_VBUS pin of a USB interface chip; a power pin of the control circuit is connected with a fixed voltage input end which inputs a high level; and the control circuit is configured to output a fixed voltage from the output pin of the control circuit when detecting that the voltage of the control pin is more than a set threshold and output a low level from the output pin of the control circuit when detecting that the voltage of the control pin is less than the set threshold.