A 2.4‐GHz bandpass filter for flexible RF applications

• DOI: 10.1002/mop.26588
• Publication Date: 2011-12-15T06:08:13Z
• Authors: Jin‐Sup Kim; Kyu‐Bok Lee; Jae‐Young Lee; Ho‐Jun Lee; Hyunchol Shin
• Keywords: Passband; Return loss

Abstract A 2.4‐GHz bandpass filter is implemented on a flexible printed circuit board with thickness of 127 μm for wearable RF applications.The realized in double‐sided structure, which the top side provides main filtering characteristics using two coupled resonators and bottom efficient signal feeding coupling mixed scheme. The scheme combining broadside‐ cross‐coupling structures advantageous to improve insertion loss. when bended by up 90° are simulated three‐dimensional electromagnetic simulation tool experimentally verified. Measurement results show that loss less than 1 dB return 26 across total passband from 2.4 2.5 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:384–387, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26588