A compact high-resolution THz time-domain waveguide spectrometer that is operated inside a cryostat is demonstrated. A THz photo-Dember emitter and a ZnTe electro-optic detection crystal are directly attached to a parallel copper-plate waveguide. This allows the THz beam to be excited and detected entirely inside the cryostat, obviating the need for THz-transparent windows or external THz mirro...

The plane wave diffraction by a terminated, semi-infinite parallel-plate waveguide with four-layer material loading is rigorously analyzed using the Wiener-Hopf technique. Introducing the Fourier transform for the unknown scattered field and applying boundary conditions in the transform domain, the problem is formulated in terms of the simultaneous Wiener-Hopf equations satisfied by the unknown...

The diffraction by a finite parallel-plate waveguide with four-layer material loading is rigorously analyzed by means of the Wiener-Hopf technique for the H-polarized plane wave incidence. Taking the Fourier transform for the unknown scattered field as well as the Helmholtz equation and applying boundary conditions in the transform domain, the problem is formulated in terms of the simultaneous ...

A high gain vertically polarised travelling-wave frequency scanning array antenna fed by a meander rectangular waveguide is presented for Ku-band operation. The proposed used in radar demonstrator setup to detect and monitor birds direct proximity the wind farms. goal prevent collisions of with consists 34 inclined dumbbell-shaped radiating slots integrated parallel-plate waveguide. meandered f...

The resolution of a frequency diverse compressive metamaterial aperture imager is investigated. The aperture consists of a parallel plate waveguide, in which an array of complementary, resonant metamaterial elements is patterned into one of the plates. Microwaves injected into the waveguide leak out through the resonant metamaterial elements, forming a spatially diverse waveform at the scene. A...

Radial line slot antennas (RLSAs) are well known as high-efficiency planar antennas in high-gain region for the circular polarization [1]. Figure 1 shows the structure of a general RLSA. A radial waveguide is composed of two parallel circular metal plates. An electromagnetic power is fed from the center and excites a slot array on the top plate. To obtain a pencil beam, the radiating elements a...

The center-feed structure is applied to the post-wall waveguide fed parallel plate slot array to widen the frequency bandwidth. The center-feed antenna has a blocking area at its center. This blocking makes the sidelobe level high in the Eplane, therefore the width of the blocking area should be reduced. The authors propose a novel center-feed waveguide consisting of -junctions for this reducti...