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ChipDesign's tunable antenna for mobile devices consists of a low-profile electronically-tunable electrically-small (18.5 cm long) slot antenna, which allows for improved receiver selectivity1. The tunable antenna can be used in conjunction with software defined radios (SDRs) such as for example the Ettus/NI USRP, the FlexRadio, the FUNcube Dongle, the HackRF and the RTL-SDR.
Tunable elements: 3 RF varactor diodes integrated in the radiating aperture for improved antenna match tuning. The tuning time is limited by the RC constant of the low pass filter on the PWM outputs. The RF varactor diodes do generate spurious emission.
Seeed version - Test hardware influencing the antenna match: Seeeduino Lotus micro-controller board and 10 cm U.FL to SMA adapter.
1. UWB antennas, such as the log-periodic and the Archimedean spiral antenna, are electrically-large and therefore do not allow for MIMO on the handset, and offer no selectivity.↩
2. 3.3 V mbed micro-controller boards will require 3.3 V to 5 V level shifters to be inserted to bias the varactors up to 5 V and cover the entire tunable frequency range of the tunable antenna.↩
If you have any technical problem, please contact info [at] chipdesign.be.