Phased array antennas, capable of forming multiple agile beams of radiation, are ever-increasing operating frequencies. Systems operating at being deployed at frequencies of 30 GHz and above, a range known as millimetre-waves, include military radar, commercial collision-avoidance radar, inter-satellite communication links, and future wideband mobile internet satellite communications services. Millimetre-wave phase shifters, the topic of this thesis, are key components of many phased array antennas.;A phase shifter refers to any device that can dynamically alter the phase, or the timing, of a signal. Although a number of concurrent millimetre-wave phase shifter designs presently exist, none simultaneously satisfies all of the desired requirements, including: light weight, small size, low cost, and good electrical performance. Phase shifters may be broadly categorised based on the material they use, either semiconductor or ferrite. Semiconductor shifters satisfy the former two requirements but suffer from high electrical losses. Conversely, traditional ferrite phase shifters have excellent electrical performance but are bulky and difficult to integrate with other components.;Given the superior electrical performance of ferrite phase shifters, a more compact means of fabricating these is proposed in this thesis. In addition, new types of ferrite phase shifters are devised, and these are subsequently made from a chip-packaging technology called low temperature cofired ceramic. The resulting phase shifters are easily fabricated, are simple to interconnect to other integrated circuits, are more compact and lightweight than their predecessors, and have excellent electrical performance at millimetre-wave frequencies. Prototype phase shifters have been successfully manufactured using an experimental ferrite ceramic material and have yielded a maximum phase shift of 53° at 36 GHz for bias currents of -500 to +500 mA.;Phased array antennas, capable of forming multiple agile beams of radiation, are being deployed at ever-increasing operating frequencies. Systems operating at frequencies of 30 GHz and above, a range known as millimetre-waves, include military radar, commercial collision-avoidance radar, inter-satellite communication links, and future wideband mobile internet satellite communications services. Millimetre-wave phase shifters, the topic of this thesis, are key components of many phased array antennas.;A phase shifter refers to any device that can dynamically alter the phase, or the timing, of a signal. Although a number of concurrent millimetre-wave phase shifter designs presently exist, none simultaneously satisfies all of the desired requirements, including: light weight, small size, low cost, and good electrical performance. Phase shifters may be broadly categorised based on the material they use, either semiconductor or ferrite. Semiconductor shifters satisfy the former two requirements but suffer from high electrical losses. Conversely, traditional ferrite phase shifters have excellent electrical performance but are bulky and difficult to integrate with other components.;Given the superior electrical performance of ferrite phase shifters, a more compact means of fabricating these is proposed in this thesis. In addition, new types of ferrite phase shifters are devised, and these are subsequently made from a chip-packaging technology called low temperature cofired ceramic. The resulting phase shifters are easily fabricated, are simple to interconnect to other integrated circuits, are more compact and lightweight than their predecessors, and have excellent electrical performance at millimetre-wave frequencies. Prototype phase shifters have been successfully.
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