US 12,463,311 B2
RF filter assembly for antenna
Joung Hoe Kim, Hwaseong-si (KR); and Sang Yoong Kim, Hwaseong-si (KR)
Assigned to KMW INC., Hwaseong-si (KR)
Filed by KMW INC., Hwaseong-si (KR)
Filed on Feb. 25, 2023, as Appl. No. 18/114,228.
Application 18/114,228 is a continuation of application No. PCT/KR2021/011338, filed on Aug. 25, 2021.
Claims priority of application No. 10-2020-0109563 (KR), filed on Aug. 28, 2020; and application No. 10-2021-0111453 (KR), filed on Aug. 24, 2021.
Prior Publication US 2023/0223670 A1, Jul. 13, 2023
Int. Cl. H01P 1/20 (2006.01); H01P 1/203 (2006.01); H01P 1/208 (2006.01)
CPC H01P 1/203 (2013.01) [H01P 1/20 (2013.01); H01P 1/208 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An RF filter assembly for an antenna, comprising:
a bandpass filter (BPF);
a filter board stacked and disposed on a front surface of a main board and configured to mediate a coupling of the BPF with the front surface of the main board;
a low pass filter (LPF) in which a capacitor line serving as capacitance and an inductor line serving as an inductor are printed on a front surface of the filter board in an intaglio or embossed form; and
an air layer-forming pad disposed between the filter board and the BPF and configured to form a predetermined air layer between the front surface of the filter board and a rear surface of the BPF.