Abstract: A resonance device including a plurality of resonators arranged in a state of being spaced apart from each other; and a notch resonator formed above the plurality of resonators, wherein the notch resonator includes: a transverse layer having an area overlapping with at least three resonators of the plurality of resonators; and a plurality of short-ended layers connecting the transverse layer to a first ground surface.

Abstract: A resonance device including a plurality of signal input/output ports, further including: a plurality of resonators arranged in a state of being spaced apart from each other; and a notch resonator formed at a side of the plurality of resonators, wherein the notch resonator includes: a laminated part having a laminated structure formed by layering a plurality of conductive layers; a first transmitting layer connected to one of the plurality of conductive layers; and a bridge connected between the first transmitting layer and one of the plurality of resonators, wherein one of the plurality of signal input/output ports is connected to the bridge.

Abstract: A multi-band filter is disclosed. The multi-band filter includes: a housing including an antenna connector connected to an antenna and a plurality of input/output connectors inputting/outputting signals transmitted and received through the antenna depending on a preset frequency band; a plurality of band pass filter units provided in the housing and passing the signals in the preset frequency band therethrough between the antenna connector and the input/output connectors; and a coupling unit including a plurality of feeding parts so as to couple the antenna connector and each of the plurality of band pass filter units to each other.

Abstract: A multiplexer with a common port feeding structure is disclosed. The multiplexer with a common port feeding structure of the present invention comprises: a housing comprising an antenna connector connected to an antenna for bidirectional transmitting and receiving and a plurality of input/output connectors bidirectionally inputting and outputting a specific frequency band of wireless signals which are input/output through the antenna; a plurality of band-pass filter units mounted inside the housing to transmit wireless signals at between the antenna connector and the input/output connector to pass a specific frequency band; and a coupling unit having a plurality of feeding members to couple the antenna connector and each of the plurality of band-pass filter units.

Abstract: A resonance device is disclosed. The resonance device in accordance with an embodiment of the present invention includes: a case including a first ground surface and a second ground surface which face each other; a stacked part formed inside the case by stacking a first conductive layer and a second conductive layer, wherein the first conductive layer is grounded to the first ground surface and the second conductive layer is separated from the first conductive layer without being grounded to the first ground surface; and a transmission layer connecting the second conductive layer to the second ground surface.