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.     

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.     

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.     

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.     

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.     

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.     

Dominant mode characteristics of circular groove guide

Circular groove guide is a kind of waveguide for millimeter waves with low loss, large dimensions, and low dispersion. In this paper, the dominant mode characteristics of it is analysed. The technique that mode macthing method combines with point matching method is used to derive the Nth-order characteristic equation of the guide. The 1st order, 2nd order and 3rd order approximate curves that the normalized cutoff wavelength of circular groove guide varies with c/a are given. The attenuation curves are given at 1mm, 1.5mm and 3mm wavelength. The numerical results are in well agreement with the experimental results published.     

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.     

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.     

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.     

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.     

A variable-gain radiating horn using groove guide

A radiating horn of continuously variable gain using groove-guide is proposed. The beam width in both planes is varied. Some experimental measurements at 100 GHz confirm the behaviour.     

IMPATT oscillator for groove guide at 95 GHz

An oversized-cavity millimetre-wave IMPATT oscillator has been constructed which can be easily coupled to a groove guide via a simple transformer. A resonant-cap structure is used to determine the frequency of oscillation. The oversized-cavity results in the Q of the oscillator being greater than that of a conventional impatt oscillator, but the output power and frequency are nevertheless stable. The tuning characteristic is discussed and a frequency spectrum presented.     

Conformal mapping analysis of a type of groove guide

A waveguide, limited by two parallel metallic plates with two symmetric opposite grooves of properly chosen shape, is analysed. A conformal mapping of the transverse cross-section into a rectangular region has been utilised; only modes with symmetric electric field are considered. Numerical results are obtained for a particular case.