A study on a multilayer diplexer using LTCC technology for ultra-wideband wireless modules

Abstract

Abstract:A multilayer diplexer in a low temperature co-fired ceramic substrate for compact ultra-wideband (UWB) wireless modules is presented. This diplexer can separate the band group 1 (3.168-4.752 GHz) of multiband orthogonal frequency-division multiplexing UWB systems from the band groups 3 and 4 (6.336-9.504 GHz) of the same systems. The basic characteristics of the diplexer are simulated with a circuit simulator and an electromagnetic simulator. The fabrication and measurement of the presented diplexer are also carried out. The measured results of the fabricated diplexer agree well with the simulated results. The insertion losses are less than 2.0 dB and the isolation characteristics are higher than 30 dB. The diplexer achieves a compact size (7.2 x 3.6 x 0.384 mm 3 ). Keywords: diplexer, low temperature co-fired ceramic (LTCC) substrate, matching circuits, ultra-wideband (UWB) Classification: Microwave and millimeter wave devices, circuits, and systems References[1] Y.-S. Lin, C.-C. Liu, K.-M. Li, and C. H. Chen, "Design of an LTCC tri-band transceiver module for GPRS mobile applications," IEEE Trans.

A Design Method of Compact Lumped-Element Matching Circuits for Diplexers Using SAW Filters

“…[3][4][5][6] Diplexers based on low temperature co-fired ceramic (LTCC) technology are useful for a compact size and low insertion losses. [7,8] Many planar diplexers use transmission lines for the matching circuits. [1] An open stub can also be used for the impedance matching.…”

“…[6] Matching circuits based on LTCC technology have also been reported. [7,8] In [8], the matching circuits of the wideband diplexer consist of three lumped elements. This diplexer is designed by modifying the three elements and a part of the filter for impedance matching.…”

Microstrip diplexer based on common dual-band filter

“…This kind of diplexers, however, is large in size from the junction. In [10,11,12], compact diplexers and multiplexer are proposed using Low Temperature Co-fired Ceramic (LTCC) technology. In [13,14], the common resonator technology is proposed to replace the junction in the diplexer designs and reduces the diplexer circuit size.…”

A design method of matching circuits for a compact diplexer using SAW filters

“…Therefore, the frequency bands are specified by manufactures. The diplexers based on a low temperature co-fired ceramic (LTCC) technology realize a compact size and wideband characteristics [3] [4]. For a design method of the matching circuits, lumped elements are applied to the LTCC diplexers.…”