US 10,892,539 B2
Branch-line coupler
Yu-Chih Chueh, New Taipei (TW)
Assigned to NANNING FUGUI PRECISION INDUSTRIAL CO., LTD., Nanning (CN)
Filed by NANNING FUGUI PRECISION INDUSTRIAL CO., LTD., Nanning (CN)
Filed on Mar. 20, 2020, as Appl. No. 16/824,904.
Application 16/824,904 is a continuation of application No. 16/190,403, filed on Nov. 14, 2018, granted, now 10,644,375.
Prior Publication US 2020/0220246 A1, Jul. 9, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. H01P 5/12 (2006.01); H01P 5/18 (2006.01); H01P 5/22 (2006.01)
CPC H01P 5/184 (2013.01) 15 Claims
OG exemplary drawing
 
1. A branch-line coupler, comprising:
an input port, a transmission port, a coupled port, and an isolated port;
a first angular transmission line, a second angular transmission line, and a first long strip transmission line, wherein the first angular transmission line is electrically connected between the input port and the transmission port, the second angular transmission line is electrically connected to a first end of the first angular transmission line, and the first long strip transmission line is electrically connected to a second end of the first angular transmission line;
a third angular transmission line, a fourth angular transmission line, and a second long strip transmission line, wherein the third angular transmission line is electrically connected between the coupled port and the isolated port, the fourth angular transmission line is electrically connected to a first end of the third angular transmission line, and the second long strip transmission line is electrically connected to a second end of the third angular transmission line;
a third long strip transmission line electrically connected between the input port and the isolated port; and
a fourth long strip transmission line electrically connected between the transmission port and the coupled port.