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The radial line waveguide slot array antennas have two types of slot array arrangement. The rotational mode feed structure uses the concentrically arrangement slot array which is the same slot length. It is possible to reduce the computational resource because it is good in each division to calculate the shape of the radiating slots. This art makes it is possible to large scale analysis which includes...
Multi-band antenna elements consisting of a loop slot for lower-band and two slots for higher-band are designed for cellular base station antennas. This antenna is fed by Tri-plate line to eliminate feeding coaxial cables and connectors of feeding network circuits and its frequency bands are 0.8/0.9 GHz and 1.7/2.0 GHz. This paper discusses the design method of multi-band polarization diversity array...
An array antenna is composed antenna elements and feed circuit network, and different substrates are often used to suppress degradation of antenna performance. Conventionally, interconnecting structure such as connectors or jigs in order to connect these substrates to each other. ACP is suitable to connect antenna substrate and feed network. In this paper, a 16-element feed-circuit-integrated patch...
A 4×4 aperture-coupled water patch antenna array is proposed. The most difference between this water patch antenna array and traditional metallic patch antenna is that the radiation patch on top of substrate is replaced by pure water. The water antenna array uses H-shaped slot aperture coupled method to feed the structure. Simulation is conducted with a commercial solver and the results show that...
In recent years designing array antenna at microwave and millimeter wave frequencies for commercial and military purposes have become popular. The designed feed network causes losses. As frequency increases, losses caused by tangent losses of substrate and roughness of microstrip line increase drastically, especially in microstirp antenna array structures. In this study, we benefited from bandwidth...
We are presenting the design of a high gain printed antenna array consisting of 420 identical patch antennas intended for FMCW radar at Ku band. The array exhibits 3 dB-beamwidths of 2° and 10° in H and E plane, respectively, side lobe suppression better than 20 dB, gain about 30 dBi and VSWR less than 2 in the frequency range 17.1 – 17.6 GHz. Excellent antenna efficiency that is between 60 and 70...
The paper investigates the feeding structures for printed antenna arrays with parallel reflector and their influences on antenna parameters. Two printed antenna arrays are presented. The first consists of ten series fed symmetrical dipoles with tapered impedances. The second is the array of eight symmetrical dipoles that are fed by a tapered distribution. The feeding structures for both antennas are...
This paper presents design of an integrated lens antenna aimed for beam-steering applications at the E-band. A 95-mm lens antenna is designed and fabricated in order to provide high and almost constant gain in an angular beam steering range up to 16° off from the bore-sight. The radiation pattern of the lens antenna is measured at 75 GHz with an open-ended WR-10 waveguide as the lens antenna feed...
The design of a rectangular WR62 waveguide fed finline (tapered slot) antenna is presented. The antenna utilizes a tapered E-plane ridge within the rectangular waveguide to provide a smooth matched transition. This type of antenna is targeted for high power phased array applications where dielectric materials are prohibitive. Simulation shows wideband characteristics from covering the full WR62 bandwidth...
One panel of a deployable parallel plate slot array antenna fed by rectangular waveguide at its lower-edge side has been designed, fabricated and measured. This antenna operates in X-band with right handed circularly polarized radiation. The antenna system is entirely designed using HFSS simulator. From the measurement result, it is shown that at its center frequency (9.65 GHz), 80% aperture efficiency...
In this paper, the characteristics of Reflectarray Antennas printed on convex curved surfaces are analyzed. In particular, results on the radiation performances of different Reflectarrays designed to be mounted on cylinders with different radii of curvature are presented and discussed.
In general, the radiation pattern of an antenna array can be predicted by the array factor and the radiation pattern of the array element. However, the radiation pattern of a reconfigurable slot-ring antenna varies with ground plane size. To explore the reconfigurable slot-ring antenna array performance, the effects of the ground plane size on radiation pattern of the reconfigurable slot-ring antenna...
A candidate High Gain Antenna (HGA) architecture for NASA's Europa Clipper mission is presented. The HGA is a dual reflector antenna system composed of an Axially Displaced Ellipse (ADE) geometry with an X/Ka-band feed. In this investigation an array feed composed of four X-band horns surrounding a Ka-band feed is investigated as a low-cost feed option.
Efficient substrate integrated waveguide (SIW) to co-planar waveguide (CPW) transition junction implemented in a multi-layer structure is presented for phased array millimeter-wave applications. The coupling between the two different lines takes place via an aperture (slot) cut on the SIW top ground plane. The transition is simulated by the full-wave solver over the frequency band 29–30 GHz. It shows...
Measurement of land surface snow remains a significant challenge in the remote sensing arena. Developing the tools needed to remotely measure Snow Water Equivalent (SWE) is an important priority. The Wideband Instrument for Snow Measurements (WISM) is being developed to address this need. WISM is an airborne instrument comprised of a dual-frequency (X- and Ku-band) Synthetic Aperture Radar (SAR) and...
A novel design for large microstrip array antennas is presented. The design is based on combination of standing-wave and traveling-wave antennas. A standing-wave antenna provides a compact structure because it does not require quarter-wavelength transformers. However just with a standing-wave design, the array size has to remain relatively small. Thus the concept for traveling-wave antennas needs...
This paper proposes a signal processing method suitable for a dipole array and a loop antenna in a borehole (DALAB) that enables estimation of the polarization states of a wave incident on the DALAB in directional borehole radar. In the processing, we pick complex amplitudes of both a dipole signal and a loop signal in the time domain, and calculate a ratio of the two amplitudes. The polarization...
This paper provides details on the design of a beam steerable array antenna for mobile applications at 28 GHz frequency band. The array is designed using a Rogers RT/duroid 5880 substrate material of 0.254 mm thickness and dielectric constant of 2.2. The designed antenna is fed by a 2 × 2 Butler matrix (BM) which also serve as a beam former to obtain the beam scanning of from −16 to 16 degrees. The...
Leaky Feeder (LF) or radiating cables promises broadband wireless access in short range but being overlooked until now. The LF is a natural linear array transceiver ideal for micro and pico cells. In this work, we model the LF as a linear antenna array and derive the average bit error rate (BER) in Rayleigh fading channel considering quadrature phase shift keying (QPSK) modulation. We consider maximal...
The paper deals with a simulation of dipole antenna array. An omnidirectional antenna characteristic in the azimuthal plane is created. Vertical plane consists of antenna characteristics with cosecant beam shape. Efficient interconnection between program AWR and CST were used to optimize the antenna characteristics.
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