Changzhou Hua

UWB Heart-Shaped Planar Monopole Antenna with a Reconfigurable Notched Band

This paper presents a heart-shaped planar monopole antenna for ultra-wideband (UWB) applications. To increase the impedance bandwidth of the antenna and achieve UWB coverage, we use a heart-shaped radiating patch fed by a microstrip line and an elliptical curved ground plane. Based on this structure, by etching an annular slot loaded with a capacitor in the heart-shaped radiating patch, a planar band-notched UWB antenna can also be obtained. Specifically, to demonstrate the potential application of the proposed structure, a UWB antenna design with a reconfigurable notched band is presented by using a varactor to replace the capacitor. Commercial software ANSYS HFSS is used to analyze and design this antenna. Measured results of the fabricated antenna show good agreement with simulated ones.

A novel dual-band bandpass filter with C-section loaded resonators

A novel dual-band bandpass filter with C-section loaded resonators is presented in this paper. The resonance characteristics are simply analyzed by using odd-/even-mode method. Based on the new resonator structure, an experimental dual-band filter is demonstrated with center frequencies of 1.5 and 2.5 GHz. The measured results exhibit good agreement with the full-wave simulation results, validating the proposed design concept.

MM-wave cylindrical lens antenna for maritime high-speed wireless communications

A novel cylindrical lens antenna operating at millimeter-wave (mm-wave) frequencies has been designed for maritime high-speed wireless communications. It is composed of a cylindrical modified Luneberg lens and a planar feed linearly-tapered slot antenna (LTSA). The cylindrical modified Luneberg lens consists of two parallel plates which are partially filled with Polytetrafluoroethylene (Teflon). The lens antenna is designed, fabricated and tested at 30 GHz. Measurements show clean and symmetrical fan-beam patterns. The measured 3-dB E- and H-plane beamwidths are 6.6° and 52.5°, respectively, and the E-plane sidelobe is -19.9 dB. In addition, an impedance bandwidth of 17.3% is observed.