US 12,323,121 B2
Tunable filtering using conductively coupled resonances
Mahmoud Musbah Ahmad Abdelfattah, Simi Valley, CA (US)
Assigned to SKYWORKS SOLUTIONS, INC., Irvine, CA (US)
Filed by SKYWORKS SOLUTIONS, INC., Irvine, CA (US)
Filed on Sep. 20, 2022, as Appl. No. 17/948,566.
Claims priority of provisional application 63/247,578, filed on Sep. 23, 2021.
Prior Publication US 2023/0088761 A1, Mar. 23, 2023
Int. Cl. H03H 7/01 (2006.01)
CPC H03H 7/0115 (2013.01) 26 Claims
OG exemplary drawing
 
1. A filter circuit comprising:
a first node;
a second node;
a variable reactance coupled to the first node, the variable reactance including at least one impedance of a first type;
a first impedance coupled to the first node, the first impedance being of a second type of impedance different than the first type;
a second impedance of the second type coupled between the variable reactance and the first impedance; and
a third impedance of the second type coupled at a first end to the first impedance and the second impedance, and coupled at a second end to the second node, the variable reactance being configured to operate in a plurality of resonant modes that each correspond to a resonant frequency, the resonant frequency being based on a reactance of the variable reactance and reactances of one or more elements of a set including the first impedance, the second impedance, and the third impedance.