Abstract: A circularly polarized antenna includes a main board, a radiator, a feed structure, and a perturbation structure. The radiator is in a ring shape. The feed structure is arranged between the main board and the radiator. The main board is electrically connected to the radiator through the feed structure. The perturbation structure is arranged between the main board and the radiator and configured to disturb a resonant electromagnetic field generated by the radiator.

Abstract: An antenna structure includes a first arc-shaped radiator and a frequency modulation component. A first end of the first arc-shaped radiator is configured to be electrically connected with a position determination component, a second end of the first arc-shaped radiator is configured to be grounded, and the first arc-shaped radiator is configured to receive a first frequency signal and a second frequency signal. The frequency modulation component is electrically connected with the first arc-shaped radiator, and the frequency modulation component is configured to adjust a frequency of the first frequency signal to a first target frequency and a frequency of the second frequency signal to a second target frequency. The first frequency signal includes a first satellite positioning signal, and the second frequency signal includes a second satellite positioning signal.

Abstract: A dual-band antenna includes a radiator, a feed apparatus, and a first tuning module. The radiator includes a radiator element. The feed apparatus includes a feed point. The radiator element is electrically connected to the feed apparatus through the feed point. The first tuning module is electrically connected to the radiator element and configured to receive a first signal of a first frequency and a second signal of a second frequency. An effective length of the radiator element is 1/4 of a wavelength corresponding to a frequency between the first frequency and the second frequency.

Abstract: The present disclosure discloses an acoustic output device. The acoustic output device may include a speaker assembly, configured to convert audio signals into vibration signals; a functional assembly electrically connected to the speaker assembly; and a supporting structure, configured to be connected to the speaker assembly and the functional assembly, wherein the supporting structure includes a metal body therein, and the metal body may be electrically connected to the functional assembly.

Abstract: An antenna structure and a wearable electronic device. The antenna structure includes a ring radiator provided with a feeding point, a first grounding point and a second grounding point, the feeding point is used for an electrical connection to a location determination element, and the first grounding point and the second grounding point are used for grounding respectively; a first antenna configured to receive a first satellite positioning signal of a first frequency, the first antenna includes a radiator between the feeding point and the first grounding point; and a second antenna configured to receive a second satellite positioning signal of a second frequency, the second antenna includes a radiator between the first grounding point and the second grounding point.

Abstract: Disclosed in the embodiments of the present application is a headset communication system. The headset communication system comprises: a bone conduction headset, comprising a first Bluetooth module; an intercom device, comprising a first external interface; an external communication module, comprising a second external interface and a second Bluetooth module. The external communication module is detachably provided in the intercom device and being coupled to the intercom device by means of the first external interface and the second external interface, and the bone conduction headset and the intercom device perform Bluetooth pairing by means of the first Bluetooth module and the second Bluetooth module so as to establish a Bluetooth connection.

Abstract: The present disclosure discloses an acoustic output device. The acoustic output device may include a speaker assembly, configured to convert audio signals into vibration signals; a functional assembly electrically connected to the speaker assembly; and a supporting structure, configured to be connected to the speaker assembly and the functional assembly, wherein the supporting structure includes a metal body therein, and the metal body may be electrically connected to the functional assembly.

Abstract: The present disclosure discloses an acoustic output device. The acoustic output device may include a speaker assembly, configured to convert audio signals into vibration signals; a functional assembly electrically connected to the speaker assembly; and a supporting structure, configured to be connected to the speaker assembly and the functional assembly, wherein the supporting structure includes a metal body therein, and the metal body may be electrically connected to the functional assembly.

Abstract: Disclosed in the embodiments of the present application is a headset communication system. The headset communication system comprises: a bone conduction headset, comprising a first Bluetooth module; an intercom device, comprising a first external interface; an external communication module, comprising a second external interface and a second Bluetooth module. The external communication module is detachably provided in the intercom device and being coupled to the intercom device by means of the first external interface and the second external interface, and the bone conduction headset and the intercom device perform Bluetooth pairing by means of the first Bluetooth module and the second Bluetooth module so as to establish a Bluetooth connection.

Abstract: The present disclosure discloses an acoustic output device. The acoustic output device may include a speaker assembly, configured to convert audio signals into vibration signals; a functional assembly electrically connected to the speaker assembly; and a supporting structure, configured to be connected to the speaker assembly and the functional assembly, wherein the supporting structure includes a metal body therein, and the metal body may be electrically connected to the functional assembly.

Abstract: The present disclosure discloses an acoustic output device. The acoustic output device may include a speaker assembly, configured to convert audio signals into vibration signals; a functional assembly electrically connected to the speaker assembly; and a supporting structure, configured to be connected to the speaker assembly and the functional assembly, wherein the supporting structure includes a metal body therein, and the metal body may be electrically connected to the functional assembly.

Abstract: A method for determining improved disease resistance in animals is disclosed. The method assays for a novel genetic alleles of the BPI gene of the animal. The alleles are correlated with superior disease resistance. Novel nucleotide sequences, assays and primers are disclosed for the methods of the invention.

Abstract: A method for determining improved disease resistance in animals is disclosed. The method assays for a novel genetic alleles of the BPI gene of the animal. The alleles are correlated with superior disease resistance. Novel nucleotide sequences, assays and primers are disclosed for the methods of the invention.

Abstract: A method for determining improved disease resistance in animals is disclosed. The method assays for a novel genetic alleles of the BPI gene of the animal. The alleles are correlated with superior disease resistance. Novel nucleotide sequences, assays and primers are disclosed for the methods of the invention.