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The design and performance of X-band high power 3-bit phase shifter which has been fabricated in 0.25µm GaN HEMT technology are presented.

Each bit of this phase shifter design is based on high-pass/low-pass topology.

For all eight states, the insertion loss is 12.5 ± 2.5 dB from 8-10 GHz and the input return loss is better than 9 dB over 8-10 GHz. The 3-bit phase shifter achieves a RMS phase error of 1o at 8.5 GHz and a RMS amplitude error less than 1.1dB. The measured continuous wave power data demonstrates typical input RF power handing capability of 32 dBm at 8 GHz.

This is to the authors’ knowledge the first published results of 3-bit AlGaN/GaN phase shifter.

LAST year Instron Ltd announced major moves towards a full digital product range with the introduction of the 8500 series servo‐hydraulic and the 4500 Series electro‐mechanical test instruments. Both types of machine are now installed at the Banbury Laboratories of Alcan International Ltd, joining other advanced Instron test equipment already in use. This laboratory is one of the premier materials R & D facilities in Europe, supporting the technological activity of the world's largest aluminium company, Alcan Aluminium Ltd, headquartered in Montreal.

Six new material specifications for re‐melting stock and castings have been published in the aerospace HC series of British Standards. They specify the requirements, including inspection and testing procedure, chemical composition, condition of supply, heat treatment and mechanical properties for steel castings as follows: HC 1–6 respectively — Carbon steel castings (500N/mm2); Carbon manganese steel castings (550N/mm2); 1% chromium‐molybdenum low alloy steel castings (700N/mm2): 3% chromium‐molybdenum castings (620–770N/mm2); 3% nickel case‐hardening steel castings (700N/mm2); 3% chromium‐molybdenum nitriding steel castings (850–1000 N/mm2). Publisher: British Standards Institution. Price: 15p each.

ENDEVCO UK has introduced a new microprocessor‐based instrument for conditioning and display of signals derived from vibration transducers on rotating machines.

The purpose of this paper is to review of the sensor technology at the combined manufacturing‐related shows which included quality, design and manufacturing, assembly, electronics, medical, and green manufacturing.

This paper provides in‐depth interviews with exhibitors of sensor products.

Sensor technology is advancing rapidly to keep up with manufacturing trends such as nanotechnology, automated testing, greater interest in 100 percent testing, and the need for better product quality.

Sensor users must try to keep up with the rapid advances being made by device suppliers.

All the new products are of recent introduction.