A Small-Size High-Rejection LTCC Diplexer for WLAN Applications Based on a New Dual-Band Bandpass Filter.

This paper presents a new very small low temperature co-fired ceramic (LTCC) diplexer based on a dual-band bandpass filter for wireless LAN (IEEE 802.11 a/b/g) application. The diplexer and the dual-band filter design have been realized and demonstrated in this article. Measurement results agree quite well with simulation. The new type of such diplexer significantly reduces the number of components and the size of dual-band WLAN frontend modules.

I. INTRODUCTION

In the last few years a significant growth of WLAN based applications is observed. WLAN has become one of the most popular methods for Internet access. Every day the number of so-called, hotspots” are rapidly increasing. It is an usual situation nowadays that we have wireless access to Internet in such places as airports, hotels, universities, even in coffee shops and fast food restaurants.