Presentation 2006-07-27
RF Front End Circuits employing Reconfigurable Structures
Shoichi NARAHASHI, Hiroshi OKAZAKI, Atsushi FUKUDA, Kunihiro KAWAI,
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Abstract(in English) In a future mobile ubiquitous world, all kinds of things will be interconnected as needed to form wireless networks that should arise frequently and simultaneously while changing continuously. Future mobile terminals will operate in the wireless environment in which various kind of wireless systems co-exist and intermingle, and they will be expected to be available for all of those systems. For this purpose, multi-band radio frequency (RF) circuit has been researched to attain multiple frequency band operation because it is an essential element of a mobile terminal. It is, however, difficult for PA and filter to operate at multiple frequency bands with adequate performance. This paper describes a novel scheme for a multi-band power amplifier (PA) and a tunable filter. The PA employs a low-loss reconfigurable matching network with RF-MEMS (Micro-Electro-Mechanical-System) switches. By controlling the on/off status of each switch, the matching network functions as a band-switchable matching network. The tunable filter comprises tunable resonators and coupling circuits. The tunable resonator has a comb-shaped end-shorted transmission line and switches. Resonant frequency of the resonator changes in accordance with the state of the switches.
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Keyword(in English) Reconfigurable / RF circuits / Amplifiers / Filters / MEMS
Paper # SR2006-18
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Committee SR
Conference Date 2006/7/20(1days)
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Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) RF Front End Circuits employing Reconfigurable Structures
Sub Title (in English)
Keyword(1) Reconfigurable
Keyword(2) RF circuits
Keyword(3) Amplifiers
Keyword(4) Filters
Keyword(5) MEMS
1st Author's Name Shoichi NARAHASHI
1st Author's Affiliation NTT DoCoMo, Inc.()
2nd Author's Name Hiroshi OKAZAKI
2nd Author's Affiliation NTT DoCoMo, Inc.
3rd Author's Name Atsushi FUKUDA
3rd Author's Affiliation NTT DoCoMo, Inc.
4th Author's Name Kunihiro KAWAI
4th Author's Affiliation NTT DoCoMo, Inc.
Date 2006-07-27
Paper # SR2006-18
Volume (vol) vol.106
Number (no) 188
Page pp.pp.-
#Pages 4
Date of Issue