LTCC Front-end Modules for Multi-band Applications

Abstract

This paper presents LTCC front-end modules for multi-band applications. A dual-band module composed of a diplexer, a CDMA SAW duplexer, and a GPS SAW filter for CDMA/GPS applications and a tri-band module employing PIN diodes for CDMA/GPS/PCS applications are implemented based on LTCC substrates. The measured results of the dual-band module show that the insertion loss is less than 2.4 dB and 3.5 dB in CDMA Tx and Rx bands, respectively. The insertion of GPS path is about 1.8 dB. The tri-band module provides an insertion loss of less than 0.8 dB and 1.1 dB in CDMA and PCS bands, respectively. The insertion of GPS path is about 0.4 dB. The overall size of both modules is only 4.5 mm x 3.2 mm.

A LTCC-based Ku-band 3D bandpass filter using stepped-impedance hairpin resonators

“…Some high integrated technology such as LTCC has been used to realize light weight and high performance RF system by integrate microwave device and circuit module into one package [1]. It is precisely because of its low conductor loss, dielectric loss and reliable multilayer manufacturing technology, Low temperature co-fire ceramic (LTCC) technology allows designers to integrate varieties of MMICs, passive devices and components, such as antenna and filter [2].…”

Impact of post‐therapy positron emission tomography on prognostic stratification and surveillance after chemoradiotherapy for cervical cancer

“…Therefore, it is suited for compact wireless communication module realization. Reflecting these trends, several research groups have implemented compact and integrated RF front‐end modules (FEMs) using the LTCC technology [1–7].…”

High‐level integrated passive triplexer and quintplexer module in organic SOP technology

“…As mobile communication markets demand advanced wireless systems with small size/volume, low cost, excellent performance, and multi functionalities, much research is being performed to develop new packaging technologies enabling higherlevel integration of front-end modules (FEM). Triplexer and quintplexer module are being considered as crucial ones for current US CDMA mobile handsets [1][2][3][4][5][6]. The CDMA quintplexer module is comprised of two duplexers for DCN and PCS bands, band pass filter for GPS band, and active or passive triplexer to separate each band signal (DCN, PCS, and GPS band), as shown in Figure 1.…”

“…Unfortunately, the active triplexer module could not allow simultaneous operation of mobile radio and GPS reception. In addition, as the active switch was utilized to control the RF signal, power was consumed [2,3]. The passive triplexer offers simultaneous operations with high linearity and does not require any control bias voltage for switching operation.…”