The dominant mode in closed circular groove guide

The structure of closed circular groove guide is similar to that of open circular groove guide, but it can prevent energy from leaking out of the guide. In this paper, the dominant mode in closed circular groove guide is considered. The characteristic equation is derived and solved and the results are discussed.     

Study of coupling between circular groove guide and rectangular groove guide

On the basis of the studies of single circular groove guide and single rectangular groove guide, the coupling of the two waveguides has been researched and the characteristic equation of circular—rectangular groove guide has been given in this paper.     

Wide-band circular groove guide horn antenna

A novel horn antenna based on a circular groove guide is analyzed and measured at Ku-band and Ka-band, respectively. This horn antenna can cover a frequency range from 14 to 40 GHz. Its optimum dimension was obtained according to the maximum directivity. The antenna can be matched efficiently to free space through its large aperture. Moreover, its input VSWR is low. The theoretical radiation patterns are close to the measured ones.     

Theoretical analysis of double circular groove guide

On the basis of the analysis of single circular groove guide, the field configuration of double circular groove guide has been investigated, its characteristic equation has been derived and its theoretical performances have also been discussed.     

Studies on the closed circular groove guide

When the circular-groove guide is closed at the two side ends by metal, its dispersion characteristic is studied in this paper, and theoretical values are presented. The eigen-weighted boundary integral equation method was used here.     

Coupling performance of closed double circular groove guide

Double circular groove guide is a simple structure which can be used to construct directional coupler. In this paper, the coupling property of two uniformly coupled circular groove guides is studied based on the transverse resonance analysing results of closed double circular groove guide.     

The wide band property of circular groove guide

According to the analyses of the moding properties of circular groove guide, the guide dimension for single mode operation is determined. Our results show that circular groove guide has the advantage of wide band.     

Theoretical characteristic of asymmetric double circular groove guide

In order to get a better understanding of the coupling properties of asymmetric double circular groove guide, the characteristic equation of this structure has been solved and its theoretical curves has been given and discussed.     

Further analysis of asymmetric double circular groove guide

As the development of our previous discussion on asymmetric double circular groove guide, the second-order approximate characteristic equation of this structure has been derived. This analysis will give more accurate result.     

An improvement on analytic accuracy of circular groove guide

In this paper, an Nth order approximate eigenequation of circular groove guide is presented. Using the sixth order approximate results, some propagation properties of the TE₁₁ mode of circular groove guide are recalculated. The results are more accurate than before and in good agreement with the measurements     

A study of radiation from circular groove guide horn

A novel horn antenna for millimeter waves based on circular groove guide is presented and investigated in this paper. Its radiation patterns are calculated by employing the aperture field method. The patterns obtained by experiment show agreement with calculated results.     

Dominant mode reflection at circular horn junctions

Reflection of TE11waves at the junction between a circular waveguide and a conical horn was measured. The results were compared with theoretical results of Piefke [4] and Unger [6], and agreed closely with those of Piefke.     

The effect of tolerance on characteristic of circular groove guide

The variations in propagating characteristic of circular groove guide due to tolerance are analyzed by using eigen-weighted boundary integral equation method (EWBIEM). Theoretical analysis and experimental results show that as long as the tolerance of circular groove guide is not very large the variations in characteristic of circular groove guide are very small.     

The characteristic equations of higher-order modes in circular groove guide

The characteristic equations of higher-order modes, including TE mode and TM mode, are derived in this paper. These equations are very useful for us to understand the mode distribution in circular groove guide.     

Analysis of the leaky antenna based on the circular groove guide

Journal of Infrared, Millimeter, and Terahertz Waves - The circular groove guide is one of several waveguides that will widely be used at millimeter and submillimeter waveband. The leaky antenna...     

A simple method improving the analyzing accuracy of circular groove guide

A simple method is introduced to improve the analysing accuracy of circular groove guide. With this method, the characteristic equation of circular groove guide is derived and its solution is given and discussed.     

Leakage characteristics of groove guide having a conductor strip

A full-wave characterization of the groove guide having a conductor strip is made based on the mode-matching procedure. All of the constituents of the structure, including a coupling strip, grooves and a radiating open end, are treated in a concise and rigorous way by using the generalized scattering matrix technique. Numerical results show that a set of channel guide leaky modes is also present in this structure in addition to the groove guide leaky mode. The complex propagation behaviors of both the groove guide leaky mode and the channel guide leaky mode are illustrated for various waveguide geometric parameters, and some conclusions regarding the design of leaky wave antennas using this structure are drawn     

Finite-element analysis of dispersion and loss characteristics of groove guide with arbitrary shapes

The dispersion and loss characteristics of groove guide with arbitrary shapes are analyzed with high-order finite element method. The effectiveness and the reliablity of the method are verified by the experiments and the results obtained by other methods. Groove guides with various groove shapes, such as rectangular, triangular, parabolic, elliptic and cosine functions, are investigated systematically. The calculating results show that the dispersion of groove guide with different groove shape is almost the same, however, the loss characteristics is rather different; among them, V-shape groove guide has the lowest loss which is about half of the rectangular one. All the curves and the data given in this paper can be used in designing elements and circuits of the groove guide.     

Millimetrewave groove guide with V-shaped grooves

The use of a V-groove guide has been investigated and compared with rectangular-groove guide. The V-groove guide is found to be superior. It has lower attenuation and rejects higher-order modes more effectively. Connection losses are small, and guide losses are around 0.4 dB/m at 96 GHz for an aluminium machined guide even with intermediate connections. For a 90° V-groove of depth equal to 0.4 of the plane separation, the guide wavelength is about 1% larger than the free-space wavelength. It is expected that the V-groove guide will provide a valuable single-mode low-loss and wideband waveguide for millimetrewave propagation.     

Solid-state devices in H-guide, groove guide and fence guide

A novel concept of integrating solid-state devices with H-groove and fence guides at millimetre wavelengths is described. Microstrip circuits containing beam-lead diodes are inserted parallel to the sidewalls in the centre of the guides. As an example an integrated detector circuit is shown and results of experiements presented.