Miniature 310μm tall copper-air rectangular coaxial lines (RCL) with the inner conductor supported by periodic dielectric straps are demonstrated in this paper. The measured line loss is about 0.2dB/cm at 26GHz, while the isolation between two parallel lines with a center-to-center separation of 700μm is better than 60dB. Several quasi-planar components are designed and fabricated on the same w...

Novel plasmonic power splitters constructed from a rectangular ring resonator with direct-connected input and output waveguides are presented and numerically investigated. An analytical model and systematic approach for obtaining the appropriate design parameters are developed by designing an equivalent lumped circuit model for the transmission lines and applying it to plasmonic waveguides. Thi...

Bacterial foraging optimization algorithm (BFOA) has attracted a lot of attention as a high performance optimizer because of its faster convergence and global search approach. Since its inception, BFOA has been applied successfully to wide variety various applications leading to faster convergence with higher accuracy. This paper presents one such application of the algorithm i.e. optimization ...

In this paper, a new four element rectangular dielectric resonator antenna (RDRA) for 5.0 GHzWLAN/WiMAX band is proposed. The simulation results for its radiation characteristics and the specific absorption rate (SAR) distribution in a homogenous bio-medium (muscle layer) for different antenna-to-muscle layer spacings are presented at different frequencies in 4.9–5.9 GHz band. The input charact...

The design and operation of a proof-of-principle rectangular He-Ne ring laser resonator with a cavity perimeter of 77.0 m and an area of approximately 367 m2 are described. With unevacuated beam lines this device gave an Earth-induced Sagnac frequency of 1513 Hz, with a relative Allan deviation over 1000 s down to 3 parts per million. The Earth's rotation provided a bias that eliminated the loc...

An L-shaped dual-band multiple-input multiple-output (MIMO) rectangular dielectric resonator antenna (RDRA) for long term evolution (LTE) applications is proposed. The presented antenna can transmit and receive information independently using fundamental TE111 and higher order TE121 modes of the DRA. TE111 degenerate mode covers LTE band 2 (1.85-1.99 GHz), 3 (1.71-1.88 GHz), and 9 (1.7499-1.784...

Design of a compact microstrip band reject filter is proposed. The device consists of an Open Loop Rectangular Resonator (OLRR) coupled to a microstrip line. The transmission line has a Ubend which enhances the coupling with the OLRR element and reduces the size of the filter. The filter can be made tunable by mounting variable capacitance to the system. Simulated and experimental results are p...

The accuracy of an amendment theory on the cavity perturbation technique for microwave dielectric properties measurements has been studied. The accuracy was confirmed by comparisons of experimental results with those measured by another well known measurement method – post resonance technique. Based on the conventional circular aperture coupling structure, a new equation is proposed to determin...

This paper presents a dimensional synthesis method for designing wide-band quarter-wavelength resonator bandpass filters. In this synthesis method, an alternative lowpass prototype filter and the edge frequency mapping method are proposed and applied. The improved Kand J-inverter model with the exponent-weighted turns ratio is also proposed in order to incorporate the frequency dependence of in...

This paper presents a microwave reflectometer using self-mixing oscillator antennas. A unique characteristic of the proposed reflectometer is its simple structure without a circulator and a directional coupler. Each self-mixing oscillator antenna utilizes a Gunn diode as an active device and a rectangular waveguide as a resonator and a radiator. The determination of dielectric properties of mat...