# US 2023/0065531 A1 · Single-ended test method for wave-absorbing characteristic of material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0065531 A1 - Document ID: US20230065531A1 - Status: Published application - Kind: A1 - Application number: 17/874,937 - Filed: 2022-07-27 - Published: 2023-03-02 - Earliest claimed: 2021-08-25 - Assignees: Lanzhou University - Applicants: Lanzhou University - Inventors: Xiling LI; Liang QIAO; Jianbo WANG - Web page: https://patentgrep.com/patent/US20230065531A1 ## CPC - G01N 22/00: Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more (G01N3/00 - G01N17/00, G01N24/00 take precedence) - G01R 27/04: in circuits having distributed constants {, e.g. having very long conductors or involving high frequencies} - G01R 27/2623: {Measuring-systems or electronic circuits (G01R27/2635, G01R27/2682 take precedence)} - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract Disclosed is a single-ended test method for the wave-absorbing characteristic of a material. The device comprises a sample cavity, a microwave transmission rod, spring needles, an SMA joint and a vector network analyzer, wherein one end of the sample cavity is provided with a test fixture; the microwave transmission rod is arranged in the sample cavity and is connected with the test fixture in a penetrating mode; the spring needles are arranged in the microwave transmission rod; the SMA joint is arranged at the other end of the sample cavity; the receiving end of the vector network analyzer is electrically connected with a coaxial cable, and the other end of the coaxial cable is electrically connected with the other end of the SMA joint. ## Claims ### Claim 1 A single-ended test device for the wave-absorbing characteristic of a material, comprising: a sample cavity (1), one end of the sample cavity (1) being provided with a test fixture; a microwave transmission rod (3), the microwave transmission rod (3) being arranged in the sample cavity (1) and being connected with the test fixture in a penetrating mode; spring needles, the two spring needs being respectively arranged at the two ends of the microwave transmission rod (3), and one of the spring needles being connected with the test fixture in a penetrating mode; an SMA joint (5), the SMA joint (5) being arranged at the other end of the sample cavity (1) and being connected with the other spring needle in a penetrating mode; and a vector network analyzer (7), the receiving end of the vector network analyzer (7) being electrically connected with a coaxial cable (6), and the other end of the coaxial cable (6) being electrically connected with the wiring end of the SMA joint (5). ### Claim 2 (depends on 1) The single-ended device method for the wave-absorbing characteristic of a material according to claim 1, wherein embedding grooves are formed in the two ends of the microwave transmission rod (3) respectively, and the two spring needles are connected into the two embedding grooves in a penetrating mode respectively. ### Claim 3 (depends on 1) The single-ended test device for the wave-absorbing characteristic of a material according to claim 1, wherein the test fixture comprises a short-circuit joint (2), a non-magnetic metal block (201) is arranged on the front face of the short-circuit joint (2), a first contact hole (202) is formed in the middle of the front face of the non-magnetic metal block (201), one end of the spring needle is connected with the first contact hole (202) in a penetrating mode, the inner wall of one end of the sample cavity (1) is provided with an internal thread, the outer wall of the non-magnetic metal block (201) is provided with an external thread, and the internal thread is matched with the external thread. ### Claim 4 (depends on 1) The single-ended test device for the wave-absorbing characteristic of a material according to claim 1, wherein a second contact hole (501) is formed in the back face of the SMA joint (5), and the other end of the spring needle is connected with the second contact hole (501) in a penetrating mode. ### Claim 5 (depends on 1) The single-ended test device for the wave-absorbing characteristic of a material according to claim 1, wherein the spring needle comprises a metal needle (4) and a telescopic spring (401), the telescopic spring (401) is arranged in the embedding groove, one of the metal needles (4) is slidably connected with the first contact hole (202) in a penetrating mode, and the other metal needle (4) is slidably connected with the second contact hole (501) in a penetrating mode. ### Claim 6 A single-ended test method for the wave-absorbing characteristic of a material, comprising the following steps: step one, firstly placing a to-be-tested sample in a sample cavity (1); step two, enabling a short-circuit joint (2) and the sample cavity (1) to be in tight threaded connection through a non-magnetic metal block (201), and meanwhile embedding one end of the spring needle into a first contact hole (202); step three, pushing the to-be-tested sample to the bottom of the sample cavity (1) through a Teflon push rod, so that the to-be-tested sample is in contact with the non-magnetic metal block (201); and step four, embedding the other end of the spring needle into a second contact hole (501), and starting sample detection by matching with a vector network analyzer (7).