Qiuyue Xie

A novel miniaturized wideband bandpass filter using LTCC technology

A new method for implementing the wideband bandpass filter utilizing low temperature co-fired ceramic(LTCC) multilayered technology has been proposed. The circuit of this filter is composed of 9-order resonators by inductance coupling. Based on the improved structure of the tapped combline filter, combined with circuit simulation and 3D EM simulation, a wideband filter with the bandwidth from 4GHz to 11GHz is realized with the help of DOE. The fractional bandwidth is more than 93.3%. The group delay is less than 0.6ns in the bandwidth. The implemented filter exhibits a good frequency response, low insertion loss, and especially very compact size. The final size of the fabricated filter is only 3.2mm×2.5mm×1.5mm.

6∼18 GHz GaAs PHEMT 6-bit MMIC digital phase shifter

A 6~18 GHz GaAs PHEMT monolithic microwave integrated circuit(MMIC) digital phase shifter is presented. Based on our special design of both the series Pseudomorphic High Electron Mobility Transistor (PHEMT) and shunt PHEMT control feeders, the MMIC possesses the feature of excellent return loss characteristic. Amplitude compensation techniques are used in the MMIC design to make sure high phase shift precision when the phase shift state varies. Performance redundancy optimization strategy is used to get the best performance. On-wafer measurement results of the developed MMIC chip in the 6-18-GHz band shows that the phase shift error is less than 5.625°±2°, 11.25°±2°, 22.5°±3°, 45°±4°, 90° ±7°, 180°±6.5°, the insertion loss is within the range of 8.6 dB~12.3 dB, input and output VSWR of 64 phase shift states is less than 2.1. The chip size is only 3.555 mm×4.055 mm×0.1 mm. To ensure high yield, Performance redundancy optimization strategy is used in design, and PCM (Process Control Map) and SPC(Statistics Process Control) technology are used in fabrication. The yield is more than 85%.

A novel compact LTCC UWB bandpass filter using semi-lumped highpass filter

A new method for implementing the wide band bandpass filter utilizing low-temperature co-fired ceramic(LTCC) multilayered technology has been proposed. By using the optimum semi-lumped highpass filter structure, an ultra-wideband(UWB) filter with the operation frequency band from 3.1 GHz to 11.5 GHz is realized. The implemented filter exhibits a good frequency response, low insertion loss, suppressed spurious passband, and especially very compact size with simple structure. The final size of the fabricated filter is only 3.2mm×1.6mm×0.94mm.

A miniaturized millimeter-wave bandpass filter with LTCC technology

This paper presents the design and simulation result of a miniaturized millimeter-wave bandpass filter realized by low temperature co-fired ceramic (LTCC) technology. The bandpass filter with a central frequency of 60 GHz and a 6 GHz pass-band is designed as a three-dimensional (3-D) structure based on distributed components. A distinct feature of this filter is the smaller size and lower in sertion loss than conventional filter at such a high frequency. With the assistance of the cross coupling which is implemented by a Z-shaped metal layer, a transmission zero is produced above the pass-band. The insertion loss is 1.6 dB and return loss is better than 20 dB within the pass-band. The overall size of the miniaturized filter is only 1.6mm×0.8mm×0.6mm.