Tunable duplex filter for adaptive duplexers of advanced LTE handsets

Author

Pourakbar, Mohammadreza ; Linton, Lance ; Tormanen, Markus ; Faulkner, Michael

Author_Institution

Coll. of Eng. & Sci., Victoria Univ., Melbourne, VIC, Australia

fYear

2013

fDate

2-7 June 2013

Firstpage

1

Lastpage

4

Abstract

The new generation mobile handsets must support a large number of frequency bands and duplex offsets. Traditionally, an adaptive duplexing technique makes use of a wideband circulator to create initial isolation. A tunable duplex filter is presented in this paper, achieving the required tuning range for LTE Band 1. The demonstrated circuit is implemented in a 250nm Silicon on Sapphire (SOS) process, it provides an isolation of 19dB and 14dB at the transmit and the receive frequencies, respectively. The measured insertion loss from PA to antenna port is better than 3.8dB. The measured third-harmonic suppression is 45.9dB at an input of 24.5dBm. The implemented circuit occupies an area of 3.0mm×2.2mm.

Keywords

Long Term Evolution; circuit tuning; elemental semiconductors; filters; harmonics suppression; multiplexing equipment; next generation networks; silicon; silicon-on-insulator; LTE band; SOS process; Si; adaptive duplexing technique; advanced LTE handsets; antenna port; duplex offsets; frequency bands; insertion loss; isolation; new generation mobile handsets; receive frequencies; silicon on sapphire process; size 250 nm; third-harmonic suppression; transmit frequencies; tunable duplex filter; tuning range; wideband circulator; Antenna measurements; Capacitors; Inductors; Insertion loss; Loss measurement; Semiconductor device measurement; Telephone sets; Digitally-tuned capacitors; Duplexer; LTE; Mobile phones; SOS process; Tunable filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest (IMS), 2013 IEEE MTT-S International

Conference_Location

Seattle, WA

ISSN

0149-645X

Print_ISBN

978-1-4673-6177-4

Type

conf

DOI

10.1109/MWSYM.2013.6697448

Filename

6697448