US 11,984,924 B2
Transmit/receive module
Seima Kondo, Kyoto (JP); Satoshi Tanaka, Kyoto (JP); Satoshi Arayashiki, Kyoto (JP); Hiroyuki Furusato, Kyoto (JP); Jin Yokoyama, Kyoto (JP); Toru Yamaji, Kyoto (JP); Akio Kaneda, Kyoto (JP); Kiwamu Sakano, Kyoto (JP); Junichi Yoshioka, Kyoto (JP); Tatsuya Tsujiguchi, Kyoto (JP); and Atushi Ono, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Dec. 12, 2019, as Appl. No. 16/711,898.
Claims priority of application No. 2018-234296 (JP), filed on Dec. 14, 2018.
Prior Publication US 2020/0195295 A1, Jun. 18, 2020
Int. Cl. H04B 1/48 (2006.01); H03F 3/21 (2006.01); H05K 1/02 (2006.01)
CPC H04B 1/48 (2013.01) [H03F 3/21 (2013.01); H05K 1/0243 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01); H05K 2201/10098 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A transmit/receive module comprising:
a plurality of duplexers, each of the plurality of duplexers being configured to operate in different frequency bands and comprising a transmit filter and a receive filter;
a power amplifier configured to amplify a signal having a frequency in a pass band of one of the transmit filters of the plurality of duplexers, and to output an amplified signal; and
a sending transmission line that is simultaneously connected to the plurality of transmit filters, the amplified signal output from the power amplifier being transmitted through the sending transmission line,
wherein the sending transmission line is simultaneously connected between the plurality of transmit filters and the power amplifier, and
wherein an input impedance of a second transmit filter, for frequencies in the pass band of the second transmit filter, is less than the characteristic impedance of the sending transmission line and greater than or equal to 0.8 times the characteristic impedance.