Search

In this paper, we propose and develop a partially shielded tunable filter structure using a varactor-loaded split-ring resonator. The novel physical topology of the filter is suitable for vertical stacking of filters and enables a compact multilayer tunable filter for applications requiring a very wide tuning range. The capacitance range and ratio needed to achieve the designated tuning range are presented, and analytical solutions are given for the second and third higher order modes for synthesis in the spurious-free filter operation range. Two prototypes are developed. A partially shielded tunable filter using varactor-loaded split-ring resonators is developed to verify the design method and to demonstrate the wide tuning range of a tunable filter. To further extend the tuning range, a filter bank with three stacked tunable filters at different frequency bands are designed and developed. With slight overlap between neighboring bands, a continuous tuning range of more than 6:1 is achieved. [ABSTRACT FROM AUTHOR]

Presents a novel broad-band planar antenna based on the classic Yagi-Uda dipole antenna. Dielectric-constant substrate; Planar arrays; Mutual-coupling characteristics; Passive and active arrays; Spatial power combining; Industrial applications of the antenna.

Presents a novel microstrip-to-waveguide transition utilizing a coplanar-strip Yagi-like antenna. Transition's broad-band characteristics; Optimization guidelines for individual components of the transition; Compatibility of the transition with microwave-integrated circuit technology.

Presents the novel broadband planar antenna based on the classic Yagi-uda dipole array. Use of finite-difference time-domain simulation; Emphasis of the optimization of the antenna; Applications of antenna in a wireless communication systems.