3d Lumped Components and Miniaturized Bandpass Filter in an Ultra-thin M-lcp for Sop Applications

In this work, a library of 3D lumped components completely embedded in the thinnest, multilayer liquid crystal polymer (M-LCP) stack-up with four metallization layers and 100μm of total thickness, is reported for the first time. A vertically and horizontally interdigitated capacitor, realized in this stack-up, provides higher self resonant frequency as compared to a similarly sized conventional parallel plate capacitor. Based on the above mentioned library, a miniaturized bandpass filter is presented for the GPS application. It utilizes mutually coupled inductors and is the smallest reported in the literature with a size of (0.035 × 0.028 × 0.00089)λg. The M-LCP module presented in this work is inherently flexible and offers great potential for wearable and conformal applications.