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.
A band-pass filter with an extended operating frequency range based on composites - metamaterials is considered. Two design stages are presented, when, at the first stage, a two-stage microstrip filter on a resonator with a stepwise change in impedance, an SIR filter, is developed. At the second stage, the SIR-filter is remodified by adding to it a cell of mixed combined right-handed and left-handed transmission lines made of metamaterials. At lower frequencies, in the bandwidth, insertion loss is about 4 dB in the 3.1-4.2 GHz frequency range, due to the difficulty of meeting the impedance requirements of the mixed right-hand and left-hand transmission line, for all six phases throughout the ultra-wide frequency band is required. It was found that such methods are quite applicable for the design of other radio-electronic devices, in which impedance matching in an ultra-wide frequency band is required.
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