# US 2021/0242592 A1 · Dual band antenna > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242592 A1 - Document ID: US20210242592A1 - Status: Published application - Kind: A1 - Application number: 17/116,730 - Filed: 2020-12-09 - Published: 2021-08-05 - Earliest claimed: 2019-12-10 - Assignees: UIF (University Industry Foundation), Yonsei University - Applicants: UIF (University Industry Foundation), Yonsei University - Inventors: Young Joong YOON; Jang Hwan BAE - Web page: https://patentgrep.com/patent/US20210242592A1 ## CPC - H01Q 9/045: {with particular feeding means (for circular polarisation H01Q9/0428)} - H01Q 21/064: {using horn or slot aerials (slotted waveguides arrays H01Q21/005)} - H01Q 5/378: Combination of fed elements with parasitic elements - H01Q 5/40: Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements - H01Q 9/065: {Microstrip dipole antennas (patch antenna H01Q9/0407)} - H01Q 13/16: Folded slot antennas - H01Q 13/18: the slot being backed by, or formed in boundary wall of, a resonant cavity (longitudinally slotted cylinder H01Q13/12 ){; Open cavity antennas} - H01Q 21/065: {Patch antenna array} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract The present embodiments provide a dual band antenna which divides a feed signal into two levels by a feed layer in which two layers are stacked and disposes an antenna slot in an antenna layer connected to a feed layer in a dual mode to minimize a space for an antenna. ## Claims ### Claim 1 A dual band antenna, comprising: an antenna layer which radiates an electromagnetic wave in a dual frequency band through a dual slot; and a feed layer which applies a feed signal to the antenna layer, wherein the antenna layer and the feed layer are stacked. ### Claim 2 (depends on 1) The dual band antenna according to claim 1, wherein the feed layer includes a first layer including a transmission slot and a second layer including a feed slot, the antenna layer includes a third layer including a cavity slot and a fourth layer including an antenna slot, and the first layer and the second layer are stacked, the second layer and the third layer are stacked, and the third layer and the fourth layer are stacked. ### Claim 3 (depends on 2) The dual band antenna according to claim 2, wherein the cavity slot of the third layer is disposed as a pair and the cavity slot pair is located at upper left and right in a diagonal direction of the feed slot of the second layer. ### Claim 4 (depends on 3) The dual band antenna according to claim 3, wherein the antenna slot of the fourth layer is disposed in a position corresponding to the cavity slot of the third layer. ### Claim 5 (depends on 3) The dual band antenna according to claim 3, wherein the antenna slot includes a lower band antenna slot which radiates an electromagnetic wave in a first frequency band and an upper band antenna slot which radiates an electromagnetic wave in a second frequency band, the upper band antenna slot is disposed as a pair in the lower band antenna slot and an interval antenna slot is disposed between the upper band antenna slot pair. ### Claim 6 (depends on 5) The dual band antenna according to claim 5, wherein the lower band antenna slot radiates an electromagnetic wave corresponding to a frequency band of 26.5 GHz to 29.5 GHz and the upper band antenna slot radiates an electromagnetic wave corresponding to a frequency band of 37.0 GHz to 40.0 GHz. ### Claim 7 (depends on 5) The dual band antenna according to claim 5, wherein when the dual band antenna operates in the first frequency band, distributions of an electric field are different and the arrangement of the polarities are different with respect to an imaginary reference line connecting the cavity slot pair so that dual resonance is formed. ### Claim 8 (depends on 5) The dual band antenna according to claim 5, wherein the third layer includes vias and a via which separates the electric field in the middle of the cavity slot pair is disposed and an inclined step shaped via is disposed at a lower end of the cavity slot pair. ### Claim 9 (depends on 8) The dual band antenna according to claim 8, wherein when the dual band antenna operates in the second frequency band, distributions of an electric field are different and the arrangement of the polarities are different with respect to an imaginary reference line connecting inner corners of the cavity slot pair at a curved upper end or lower end with the inclined step shape so that dual resonance is formed. ### Claim 10 (depends on 2) The dual band antenna according to claim 2, wherein the transmission slots of the first layer are symmetrically disposed to be spaced apart from each other to divide the feed signal received from the second layer. ### Claim 11 (depends on 10) The dual band antenna according to claim 10, wherein the Feed slots of the second layer are symmetrically disposed to be spaced apart from each other to divide the feed signal received from the first layer again. ### Claim 12 (depends on 2) The dual band antenna according to claim 2, wherein a plurality of matching vias for impedance matching is disposed to be close to the transmission slot of the first layer. ### Claim 13 (depends on 2) The dual band antenna according to claim 2, wherein a plurality of matching vias which matches the impedance is disposed to be close to a corner of a guide via which is disposed with an L shape in the first layer. ### Claim 14 (depends on 2) The dual band antenna according to claim 2, wherein a plurality of matching vias which matches the impedance is disposed in the center and a middle branch of a guide via which is disposed with an T shape in the first layer. ### Claim 15 (depends on 14) The dual band antenna according to claim 14, wherein when the dual band antenna operates in a dual frequency band, a feed signal is divided by a matching via disposed in the middle of the guide via disposed with a T shape in the first layer to be transmitted to the plurality of transmission slots located in the first layer and the transmitted feed signal is divided again to be transmitted to a plurality of feed slots located in the second layer from the plurality of transmission slots in phase. ### Claim 16 (depends on 2) The dual band antenna according to claim 2, wherein the second layer includes an inclined step structure transition structure connected to the feed connector.