Prospects for design and construction development of integral circuits of LC–filters based on the modern dielectric materials

Abstract

An analysis of design and technological solutions related to the production of integrated microwave filters based on modern materials - liquid-crystalline polymers (LCP) and low-temperature ceramics (LTCC) is considered. An important factor in the design of integrated filters based on multilayer printed circuit boards is the limited choice of designs for inductive and capacitive elements. It is proposed to use dielectric materials with more stable parameters and a wide range of operating frequencies (LCP up to 20 GHz, and LTCC up to 40 GHz). The results of comparison of the manufacturing process of microwave filters based on LCP and LTCC technologies are shown. One of the possible schemes and designs of a bandpass filter with a cut-off frequency of 2.9 GHz, a bandwidth of 500 MHz, and an insertion loss of about 1 dB is demonstrated. Experimental characteristics based on computer simulation of the microwave filter are presented. It is concluded that the use of LTCC-technology is preferable for solving the problem of microminiaturization of microwave filters, and the use of LCP-technology is expedient for creating narrower-band filters intended for operation in a higher frequency range of microwave filters.

Thermal-Partial Compression Process: Bypass Route for Multilayer Lamination of Liquid Crystal Polymer-Based 5G Patch Antenna Fabrication

“…On the other hand, hydrophobic liquid crystal polymer (LCP) has high stability for the long time uses maintaining the original electrical properties (Figure S1). The LCP has been studied by many researchers as a thermoplastic material for flexible printed circuit board (FPCB) because of its multiple advantages in terms of low hygroscopicity, dielectric constant, loss tangent, chemical stability, flexible property, and high formability. − …”