Jennifer T. Bernhard

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This paper describes a proposed testbed named Illinois Wireless Wind Tunnel (iWWT). The goal of the testbed is to implement "scaled" versions of wireless networks for the purpose of accurate repeatable evaluation of wireless protocols. The testbed will be implemented in an electromagnetic anechoic chamber at the University of Illinois at Urbana-Champaign.(More)
Increasingly stringent design constraints imposed by compact wireless devices for telecommunications, defense, and aerospace systems require the miniaturization of antennas. Unlike most electronic components, which benefi t from decreased size, antennas suffer limitations in gain, effi ciency, system range, and bandwidth when their size is reduced below a(More)
This paper reviews the key technological advances and regulatory decisions over the past century that have helped to enhance the use of the radio spectrum, and Blessons learned,[ and concludes by offering a bold vision of future spectrum access technologies. ABSTRACT | This paper provides an overview of how our access to the electromagnetic spectrum has(More)
RF MEMS switches are used in many applications and also can be used to achieve reconfigurability of various RF systems and in particular, that of minute sized antenna structures and systems. In the case of micro machined antennas, which usually have low voltage signals, RF MEMS switches with low actuation voltage are highly required for achieving(More)
—This letter proposes a concept for frequency-recon-figurable slot antennas enabled by pressure-driven capacitive mi-crofluidic switches. The switches are operated by pneumatically displacing a plug of eutectic gallium indium alloy (EGaIn) within an air-filled microchannel that traverses the slot orthogonally. Frequency reconfigurability is achieved by(More)