In this paper, we discuss how a holographic interference technique can be applied in the experimental determination of the phase centers of non-standard horn antennas in the millimeter-waveband. The phase center is the point inside the horn from which the radiation appears to emanate when viewed...
International Journal of HyperthermiaCamart JC, Dubois L, Fabre JJ, Vanloot D, Chive M. 915 MHz microwave interstitial hyperthermia. Part II: Array of phase- monitored antennas. Int J Hyperthermia 1993;9(3):445-454Prevost B, de Cordoue-Rohart S, Mirabel X, Camart JC, Fabre JJ, So...
Determination of the Phase Centers of Millimeter-Wave Horn Antennas Using a Holographic Interference Technique Article 15 January 2016 Experimental Study of the Scattering Properties of Microwave and Millimeter-Wave Horn Antennas Using the Inverse Aperture Synthesis Technique Article 01 June 2018 An ...
Digital phase shifters are used for the computer control of beam scanning in phased-array antenna systems [24]. At microwave frequencies, digital phase shifters can be designed using: 1) ferromagnetic materials for obtaining switchable phase shift, 2) semiconductor, or 3) MEMS devices. In ...
Other systems, such as microwave radio systems, usually have directional receive and transmit antennas facing each other from building roofs or mountaintops. Consequently, the interfering noise level is usually very low, and complex constellations such as 64-QAM or 256-QAM can be used. This ...
Figure 1(b) plots the simulated geometric phase shifts for the transmitted converted spin component from the nanoslit antennas at different rota- tion angles, showing that the phase shift variations of the converted spin component from the nanoslit antennas are twice as their rotation angles in...
4. Dual frequency microwave resolving apparatus in accordance with claim 3 wherein the radiating aperture is proportioned so as to place the phase center of the aperture comprising the tubular inner conductor and the phase center of the aperture comprising the coaxial waveguide formed by the tubular...
12.The phase-conjugate antenna system of claim 11, wherein the receive and transmit antenna elements are within the enclosure. 13.The phase-conjugate antenna system of claim 11, wherein for each pair of receive and transmit antenna elements, a midpoint between the phase centers of those receiv...
A plurality of antennas are arrayed in a direction parallel to the Z axis to form a vertical linear array antenna which rotates around the Z axis to acquire an echo signal reflected from the target object, and phase centers, in the array direction, of the antennas in the vertical linear ar...
Hybrid couplers are widely used in microwave circuits for coupling a portion of the electromagnetic energy in one waveguide to another waveguide. In some cases, the coupling ratio is one-half so as to produce an equal split of the power among the two waveguides. In other cases, a smaller am...