Broadband and miniaturization of tilted beam antenna using CSRR splits and flower‐spiral structure

Abstract

A miniaturized broadband circularly polarized antenna with tilted beam is designed and fabricated using the complementary split ring resonator (CSRR) splits and flower-spiral (FS) structure. This antenna is composed of a FS structure, helix feed line, and ground plane loaded five CSRR splits. The voltage standing wave ratio is improved through the FS structure based on the Archimedean spiral arm. And the axial ratio is improved due to the five CSRR splits and FS structure. Simulated and measured results both confirm that the ground plane is reduced about 75.2% and the bandwidth significantly broadened from about 10.5% to about 27.6%. Experimental data show a reasonably good agreement between the simulation and measured results.ABSTRACT: A wide locking range and low phase noise injectionlocked frequency divider has been developed by CMOS 0.13-lm technology. The proposed differential complementary injection-locked frequency divider (CILFD) consists of five-stage complementary inverter type connection. The differential input and output are implemented using auxiliary cross-coupled inverters. The measurement results show a divide-by-5 division ratio and a locking range from 1.5 to 4.5 GHz with an input power lower than 25 dBm. The power consumption of CILFD is 1.0 mA from 1.4-V power supply when it locked at 3-GHz input signal.

Bandwidth enhancement metamaterial antenna based on transmission line approach

“…Recently, several researchers have been investigated bandwidth enhancement of MTM antennas using zero‐order resonant antennas (ZORAs) using zeroth‐order mode , Although ZORAs offers advantage of size reduction, but they suffers from narrow bandwidth . Bandwidth enhancement method by combining two or more resonant modes have also been reported in .…”

Wideband, thin, and polarization-insensitive perfect absorber based the double octagonal rings metamaterials and lumped resistances

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