Miniaturized substrate integrated waveguide 5G LTCC bandpass filter exploiting capacitive loaded cavities

Abstract

In this article, a compact bandpass filter with a pair of transmission zeros exploiting capacitive loaded cavities is presented. The proposed filter structure is mainly composed of coplanar waveguide (CPW) feeding structures and four substrate integrated waveguide (SIW) resonators. The size of the filter has been greatly reduced due to the capacitive loaded circle metallic septum and the vertical coupling of stacked cavities in three dimensional structures by low temperature co-fired ceramic technology. The filter not only achieves the advantages of high-selectivity, a much wider upper stopband bandwidth, but also realizes a miniaturized volume of 3.35 × 2.10 × 0.66 mm 3 . The simulated and measured results show the bandpass filter achieves a center frequency of 28 GHz with 3 dB fractional bandwidth of 8%. The filter is suitable for application in 5G wireless communication.capacitive loaded, high-selectivity, LTCC, metallic septums, SIW, upper stopband

Systemic Overview of Microstrip Patch Antenna’s for Different Biomedical Applications

“…The radio wires endeavour limited cuts and holes as capacitors for detecting the permittivity of CSF. 107 Three receiving wires are structured dependent on the capacitively stacked circle (CLL), 108 corresponding split ring circle (CSRL), 109 and interdigital capacitor circle (IDCL). 110 To research if the dielectric properties of CSF are an element of age, in vitro estimations of various CSF from pigs with different ages are estimated in the sub-1-GHz band (0.1-1 GHz).…”

Analysis, Design, and Actual Fabrication of a Hybrid Microstrip-SIW Bandpass Filter Based on Cascaded Hardware Integration at X-Band

“…SIW structures, which act as highpass filters, are used in filter design due to their mentioned properties [5]. Different structures are used to obtain a bandpass filter in Manuscript received 11 August, 2020; accepted 23 December, 2020. some of the previous studies, such as microstrip structure [5], air-filled structure [6], symmetric inductive post structure [7], resonator structure [8], bent structure [9], Low Temperature Co-fired Ceramics (LTCC) structure [10], Through-Silicon Via (TSV) structure [11], cross-coupled structure [12], perturbed circular cavity structure [13], Fourier-varying via-vole walling structure [14], and GaAsbased chip filter structure [15], [16]. As the microstrip structure is easier, cheaper, and more comprehensible, it is preferred for the lowpass filter section of the bandpass filter [17].…”