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This paper presents design, fabrication and measurement results of a novel broadband, circularly polarized, planar helix antenna operating at X-band that is fabricated using printed circuit techniques. The conventional circular helix antenna is modified into a planar helix antenna, and the effect of various parameters like pitch angle, dimensions, feed and substrate, etc. on the impedance and radiation...
Modifications to a slow-wave structure (SWS) consisting of a planar helix with straight-edge connections are proposed so as to avoid dielectric charging problem when it is used in a traveling-wave tube (TWT). The planar helix SWS is suitable for microfabrication using materials such as silicon (Si) and silicon dioxide (SiO2). First, through a simple dielectric slab model, it is shown that the phenomenon...
A planar helix slow-wave structure which has straight-edge connections has been studied for traveling-wave tube applications. The effects of coplanar ground planes, on the dielectric surfaces which also contain the top and bottom inclined helix strips, are examined. The phase velocity and interaction impedance are studied for two possible planar helix configurations. The coplanar ground planes reduce...
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