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This paper presents a transmission‐line structure suitable for micromachining technology. The structure is an air‐filled square coaxial cable, which is very low loss and has been designed in order to utilise current manufacturing processes. This transmission line demonstrates that such a structure can be designed to cover very wide bandwidth. As the cable is air filled, the centre conductor needs to be supported and this is accomplished by attaching quarter‐wavelength stubs to the ground. The design method of such a cable is presented in detail and the results of an X‐band component are presented.
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Llamas‐Garro et al. (2004) studied this question.
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