# US 2014/0197993 A1 · Feeding matching apparatus of multiband antenna, multiband antenna, and radio communication device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197993 A1 - Document ID: US20140197993A1 - Status: Published application - Kind: A1 - Application number: 14/143,367 - Filed: 2013-12-30 - Published: 2014-07-17 - Earliest claimed: 2013-01-16 - Assignees: Huawei Device Co., Ltd. - Applicants: Huawei Device Co., Ltd. - Inventors: Yuanpeng Li; Hanyang WANG; Yafang YU; Meng HOU - Web page: https://patentgrep.com/patent/US20140197993A1 ## CPC - H01Q 5/328: between a radiating element and ground - H01Q 1/241: {used in mobile communications, e.g. GSM (H01Q1/247, H01Q1/248 take precedence)} - H01Q 1/48: Earthing means; Earth screens; Counterpoises - H01Q 5/314: using frequency dependent circuits or components, e.g. trap circuits or capacitors - H01Q 5/335: at the feed, e.g. for impedance matching - H01Q 9/04: Resonant antennas - H01Q 13/08: Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines - H04B 1/0057: {using diplexing or multiplexing filters for selecting the desired band} - H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)} - H04B 1/18: Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H) - H01P 1/2039: {Galvanic coupling between Input/Output} - H01P 1/2135: {using strip line filters (H01P1/2131 takes precedence)} - H01P 5/12: Coupling devices having more than two ports (H01P5/04 takes precedence) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H04B: TRANSMISSION - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) ## Abstract The present disclosure relates to the field of antenna technologies and discloses a feeding matching apparatus of a multiband antenna, a multiband antenna, and a radio communication device to improve a bandwidth and efficiency of a lower frequency band. The feeding matching apparatus of a multiband antenna includes: a grounding portion; a feeding portion connected to a signal source, where a signal of the signal source is input into the feeding portion; and two or more ground cable branches with different lengths, where one end of each ground cable branch is electrically connected to the feeding portion, the other end is electrically connected to the grounding portion, at least one ground cable branch is connected in series to a signal filtering component, and the signal filtering component is capable of preventing a signal lower than a frequency point corresponding to the signal filtering component from passing through it. ## Claims ### Claim 1 A feeding matching apparatus of a multiband antenna, comprising: a grounding portion; a feeding portion connected to a signal source, wherein a signal of the signal source is input into the feeding portion; and two or more ground cable branches with different lengths, wherein one end of each ground cable branch is electrically connected to the feeding portion, the other end is electrically connected to the grounding portion, at least one ground cable branch is connected in series to a signal filtering component, and the signal filtering component is capable of preventing passing of a signal having a frequency lower than a frequency point corresponding to the signal filtering component. ### Claim 2 (depends on 1) The feeding matching apparatus of a multiband antenna according to claim 1, wherein the signal filtering component is a high-pass filter. ### Claim 3 (depends on 2) The feeding matching apparatus of a multiband antenna according to claim 2, wherein the high-pass filter is an inductor. ### Claim 4 (depends on 1) The feeding matching apparatus of a multiband antenna according to claim 1, wherein the signal filtering component is a band-pass filter. ### Claim 5 (depends on 4) The feeding matching apparatus of a multiband antenna according to claim 4, wherein the band-pass filter is an open-circuit line led from the ground cable branch. ### Claim 6 (depends on 1) The feeding matching apparatus of a multiband antenna according to claim 1, wherein the at least two ground cable branches are separately connected in series to one signal filtering component, a frequency point corresponding to a signal filtering component in a ground cable branch with a shorter length is higher than a frequency point corresponding to a signal filtering component in a ground cable branch with a longer length, and signal filtering components to which the at least two ground cable branches are connected in series are high-pass filters or band-pass filters. ### Claim 7 (depends on 1) The feeding matching apparatus of a multiband antenna according to claim 1, wherein the multiband antenna is a dual-band antenna, the feeding portion is electrically connected to two ground cable branches with different lengths, a shorter ground cable branch is connected in series to one signal filtering component, so that the shorter ground cable branch matches one frequency band of the dual-band antenna, and simultaneously, a longer ground cable branch matches the other frequency band of the dual-band antenna. ### Claim 8 (depends on 1) The feeding matching apparatus of a multiband antenna according to claim 1, wherein each ground cable branch is connected in series to one signal filtering component, and each signal filtering component lets a different frequency band pass through, so that each of the multiple ground cable branches separately and simultaneously matches one frequency band of the multiband antenna. ### Claim 9 (depends on 1) A multiband antenna, comprising one or more radiating portions with different lengths and the feeding matching apparatus of a multiband antenna according to claim 1, wherein each radiating portion is configured to transmit a signal to a feeding portion in the feeding matching apparatus of a multiband antenna and receive a signal transmitted from the feeding portion. ### Claim 10 (depends on 9) The multiband antenna according to claim 9, wherein a radiating portion with a shorter length matches one or more ground cable branches with a shorter length, and a radiating portion with a longer length matches one or more ground cable branches with a longer length. ### Claim 11 (depends on 9) A radio communication device, comprising the multiband antenna according to claim 9.