TY - JOUR
T1 - A tunable RF Front-End with Narrowband Antennas for Mobile Devices
AU - Bahramzy, Pevand
AU - Olesen, Poul
AU - Madsen, Peter
AU - Bøjer, Jørgen
AU - Barrio, Samantha Caporal Del
AU - Tatomirescu, Alexandru
AU - Bundgaard, Peter
AU - Morris, Art
AU - Pedersen, Gert F.
PY - 2015/9
Y1 - 2015/9
N2 - In conventional full-duplex radio communication systems, the transmitter (Tx) is active at the same time as the receiver (Rx). The isolation between the Tx and the Rx is ensured by duplex filters. However, an increasing number of long-term evolution (LTE) bands crave multiband operation. Therefore, a new front-end architecture, addressing the increasing number of LTE bands, as well as multiple standards, is presented. In such an architecture, the Tx and Rx chains are separated throughout the front-end. Addition of bands is solved by making the antennas and filters tunable. Banks of duplex filters are replaced by tunable filters and antennas, providing a duplexer function over the air between the Tx and the Rx. A hardware system has been designed and fabricated to demonstrate the performance of this front-end architecture. Measurements demonstrate how the architecture addresses inter-modulation and Rx desensitization due to the Tx signal. The filters and antennas demonstrate tunability across multiple bands. System validation is detailed for LTE band I. Frequency response, as well as linearity measurements of the complete Tx and Rx front-end chains, show that the system requirements are fulfilled.
AB - In conventional full-duplex radio communication systems, the transmitter (Tx) is active at the same time as the receiver (Rx). The isolation between the Tx and the Rx is ensured by duplex filters. However, an increasing number of long-term evolution (LTE) bands crave multiband operation. Therefore, a new front-end architecture, addressing the increasing number of LTE bands, as well as multiple standards, is presented. In such an architecture, the Tx and Rx chains are separated throughout the front-end. Addition of bands is solved by making the antennas and filters tunable. Banks of duplex filters are replaced by tunable filters and antennas, providing a duplexer function over the air between the Tx and the Rx. A hardware system has been designed and fabricated to demonstrate the performance of this front-end architecture. Measurements demonstrate how the architecture addresses inter-modulation and Rx desensitization due to the Tx signal. The filters and antennas demonstrate tunability across multiple bands. System validation is detailed for LTE band I. Frequency response, as well as linearity measurements of the complete Tx and Rx front-end chains, show that the system requirements are fulfilled.
U2 - 10.1109/TMTT.2015.2470237
DO - 10.1109/TMTT.2015.2470237
M3 - Journal article
SN - 0018-9480
VL - 63
SP - 3300
EP - 3310
JO - I E E E Transactions on Microwave Theory and Techniques
JF - I E E E Transactions on Microwave Theory and Techniques
IS - 10
ER -