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Impedance tuners are being employed within mobile handsets to improve radiated performance, compensate for environmental influences on antenna impedance, shrink antenna volumes and shorten design cycles. We present details on the specification, design, development and testing of the first production impedance tuner products utilizing RF-MEMS.
Impedance tuners are in evaluation within mobile handsets to improve radiated performance, compensate for environmental influences on antenna impedance, shrink antenna volumes and shorten design cycles. As a new component in the handset RF front end designer's toolkit, tuner specifications and value propositions are subjects of heated debate. A unified approach to specifying tuner RF performance remains...
A zero-level packaged, digitally switched, RF MEMS capacitor array has been developed within a mass production capable HV RF CMOS process. These RF MEMS capacitors are grouped in flip-chip cells that exhibit a high quality factor of 87 at 2 GHz, a tuning ratio of almost 10 to 1, a self resonant frequency greater than 5 GHz, and operate using a 3.3 V supply voltage. These arrays are ideally suited...
This article introduces a 20‐μm tall, 75‐μm wide rectangular polyimide core micro coaxial transmission line that can be realized using a simplified fabrication procedure. Measurements of a 4‐bend, meandered micro coaxial line demonstrate an 8% increase in the insertion loss and a 2% variation in the phase compared with a straight line of equivalent length. Cross‐coupling below 30 dB up to 65 GHz has...
Micro coaxial transmission lines are advantageous over planar counterparts such as microstrip and coplanar waveguides due to their shielded nature for use at mm-wave frequencies. This paper proposes micro coaxial transmission lines implemented on CMOS grade silicon wafers, suitable for integration with conventional MMIC circuitry. Lines of varying characteristic impedances were designed, fabricated...
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