US 11,990,666 B2
RFID reader/writer antenna device
Noboru Kato, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Nov. 2, 2021, as Appl. No. 17/517,008.
Application 17/517,008 is a continuation of application No. PCT/JP2020/021191, filed on May 28, 2020.
Claims priority of application No. 2019-193116 (JP), filed on Oct. 24, 2019.
Prior Publication US 2022/0059924 A1, Feb. 24, 2022
Int. Cl. H01Q 1/22 (2006.01); G06K 19/077 (2006.01); H01Q 1/38 (2006.01); H01Q 13/20 (2006.01)
CPC H01Q 1/2216 (2013.01) [G06K 19/07773 (2013.01); H01Q 1/38 (2013.01); H01Q 13/206 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An RFID reader/writer antenna device comprising:
a plurality of radiating elements that are balanced feeding radiating elements and that include at least a first radiating element and a second radiating element, with the plurality of radiating elements each comprising conductor patterns that extend in directions parallel to each other and that are constructed for reading or writing of RFID tags;
a distributor that connects the first radiating element and the second radiating element to a common input/output;
balance-unbalance converters connected between the distributor and the plurality of radiating elements, respectively; and
a phase shifter configured to cause a feeding phase of the second radiating element and a feeding phase of the first radiating element to have a phase difference of 90° or 90°±10° with respect to each other.