We present the results of a molecular survey comet 46P/Wirtanen undertaken with IRAM 30-m and NOEMA radio telescopes in December 2018. Observations at during 12-18 Dec. period comprise 2 mm spectral covering 25 GHz 1 62 GHz. The gas outflow velocity kinetic temperature have been accurately constrained by observations. derive abundances 11 molecules, some being identified remotely for first time...

This paper defines the issues required for the development of successful visualisation sensors for use in open cut and underground mines. It examines the mine environment and considers both the reflectivity of the rock and attenuation effects of dust and water droplets. Millimetre wave technology, as an alternative to the more commonly used laser and sonar implementations, is selected due to it...

Broadband wireless access networks that operate in the millimetre-wave frequency band are envisaged to fulfil the bandwidth requirements of broadband multimedia services. At these frequencies, temporary obstacles and adverse meteorological conditions may drastically impair on the system performance by intercepting the required line-of-sight radio wave propagation, which results in degrading the...

When planning the link budget for millimetre and sub-millimetre wave telecommunications links, the attenuation by atmospheric gasses is taken into account. However, at millimetric frequencies above 50 GHz, it may become necessary to account for the temporal variations in absorption when calculating fade margins. Attenuation due to atmospheric absorption varies with temperature, barometric press...

The recent success of smart-phones such as the iPhone and the transition from voice to mobile video, gaming and other data-hungry applications is driving unprecedented growth in wireless data traffic worldwide. A recent survey predicts that by 2014 there will be 5 billion personal devices connected to mobile networks generating 3.6 exabytes of data traffic per month, a 39-fold increase in four ...

A broadband millimetre-wave passive spatial combiner using a microstrip probe array and an oversized coaxial waveguide is successfully designed and tested. The equivalent circuit approach of transverse electromagnetic (TEM) lines is adopted to synthesise the coaxial stepped impedance transformer from a K connector with the oversized coaxial waveguide and to analyse the microstrip probe array. T...

A 65-GHz Class-C LC oscillator designed in 65nm CMOS technology by ST Microelectronics is presented. A three spiral transformer has been used to achieve low phase noise and low power consumption. Post-layout simulations show a phase noise is equal to -88.4 dBc/Hz at 1-MHz offset from the carrier (65.8 GHz). The power consumption is 14 mW with 1.2-V supply voltage. The oscillator is capable to o...

We present a novel design of a waveguide to microstrip or coplanar waveguide transition using a unilateral finline taper. The transition from the unilateral finline mode to the TEM microstrip mode is done directly, avoiding the antipodal finline tapers that have commonly been employed. This results in significant simplification of the design and fabrication, and shortening of the chip length, t...

This paper presents an overview of the work being conducted by the Australian Centre for Field Robotics (ACFR) and the CRC for Mining Technology and Equipment (CMTE) into sensors and systems for real-time environment imaging. Radar is perhaps the only sensor capable of performing imaging tasks in environments where high levels of dust, water vapour, and rain must be contended with. Methods of v...