Compact and low-loss diplexer design and fabrication for WLAN/WiMAX application

ABSTRACT

In this paper, a compact and low-loss diplexer is designed and fabricated using integrated passive device (IPD) technique. This IPD-based diplexer can be utilized in antenna system for WLAN and WiMAX applications. It is composed of a low-pass filter and a high-pass filter, built on the GaAs substrate with the overall size of 0.95 × 0.95 mm². The IPD diplexer realizes a dual-mode operation of 2.4 GHz for WLAN and 3.3 GHz to 3.8 GHz for WiMAX, respectively. The measurement results match well with the simulation results, in which the insertion loss at operation bands are below 0.5 dB (2.4 GHz) and 0.64 dB (3.3 GHz to 3.8 GHz), and the stopband suppression keeps higher than 20 dB.

KEYWORDS:

• Integrated passive device
• diplexer
• compact size
• low-loss
• WLAN
• WiMAX

ORCID

Jun-Ge Liang http://orcid.org/0000-0003-1289-6513

Additional information

Funding

This research is supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX18_1856), Natural Science Foundation of China [grant number 61801146], General Financial Grant from the China Postdoctoral Science Foundation (2017M611367, 2018M641813), the Heilongjiang Postdoctoral Fund (LBH-Z17056), and a great supported by the Fundamental Research Funds for the Central Universities (JUSRP51726B, JUSRP51510).