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Advanced antenna arrays were designed for NASA's EcoSAR airborne radar instrument. EcoSAR is a beamforming synthetic aperture radar instrument designed to make polarimetric and "single pass" interferometric measurements of Earth surface parameters. EcoSAR's operational requirements of a 435MHz center frequency with up to 200MHz bandwidth, dual polarization, high cross-polarization isolation...
In Simultaneous Transmit and Receive (STAR) systems, antenna port isolation is important as it reduces coupling between transmit and receive chains. If the coupling is too high, the transmit signal can leak into the receive path and saturate the receiver. In this paper, we present a dual-polarized four-arm spiral array operating from 3 to 5 GHz for concurrent right hand and left hand circular polarizations...
Connecting the arms of spirals in a dual circularly-polarized array significantly increases the array bandwidth. The connections decreased the low frequency cutoff from 1 GHz (without connections) to 350 MHz of the original array without connections (1 GHz). In this paper, an analysis at even lower frequencies is carried out revealing that the array is still useful at the original low frequency cutoff...
This work presents the development of a low cross-polarization ultra-wideband end-fire notch array element, termed the Sliced Notch Antenna (SNA). The proposed element topology solves the long-standing problem of polarization purity degradation in typical end-fire notch arrays (Vivaldi arrays) when scanned in the non-principal planes by re-configuring the high-profile continuous metal Vivaldi fin...
A novel, substrate-free, Frequency-scaled Ultra-wide Spectrum Element (FUSE) antenna has been designed and built. Measured results from a 17×16 prototype demonstrate experimental validation for a scalable, low-profile, and dual-polarized phased array that has 7:1 bandwidth ratio, scanning 45 degrees in elevation at all azimuth with a VSWR lower than 2, and has better than −17 dB cross-polarization...
A design of broadband multiple-input and multiple-output(MIMO) millimeter wave transceiver system is developed in this paper. The millimeter wave(mm-wave) transceiver system includes the ultra-wide bandwidth baseband data processing unit (BAP), intermediate frequency module (IF), mm-wave frontend and the power module. The developed system can support 4×4 MIMO configuration. The mm-wave frequency of...
In this contribution, we discuss a possible antenna-based cloak for overcoming the intrinsic narrow frequency and angular bandwidths of conventional metasurface-based cloaks. The idea is to use a fully passive antenna array to mimic the reflection from a ground plane even in presence of an electrically large metallic bump. Here, a triangular bump over a ground plane is cloaked covering both sides...
The radiation characteristics of a diamond array (DA) of diamond elements are calculated using the method of moments. It is found that the maximum gain for the DA is higher than that for a conventional grid array antenna (GAA). It is also found that the frequency bandwidth of the gain for the DA is slightly narrower than that for the conventional GAA.
We present a 2 × 2 element array based on circularly polarized (CP) metasurface-based antennas fed by a sequential phase network. The single element consists of a microstrip-line-fed slot antenna coupled to a metasurface having 4 × 4 truncated corner square patches. The proposed array, with an overall size of 50 mm × 50 mm × 2.032 mm, resulted in an impedance bandwidth of 7.5 – 11.0 GHz (37.84%) for...
In this paper, a novel travelling-wave printed Frequency Scanning Antenna (FSA), which can be used for imaging purposes, is proposed. All sample designs scan the space symmetrically about the broadside direction. For different scanning ranges, two low profile antennas are designed on a 6.6 mils thick Rogers 4350 board substrate layer. Impedance bandwidth of the first one covers 6.5GHz, from 29.5GHz...
As fast development in communication field, sub-6 GHz spectrum band becomes ultra crowd. Even though Carrier Aggregation (CA) and higher order modulation used, available spectrum is still the bottleneck of communication speed and network latency. Nowadays, more and more companies and institutes are paying more attention to over 6GHz communication system research. Recently released news indicate frequency...
A dual-broadband 2G/3G/LTE (4G) array antenna is proposed in the paper. The prototype of the antenna is composed of a lower-band (dipole) and an upper-band radiation unit (a pair of two folded dipole). Four lower-bands and six upper-band units are interleaved to array on H-plane for roof mounting on car top, depending on the gain and coverage tradeoffs. In terms of the criterion of S11 less than −10dB,...
With the advent of recent trends like Internet Of Things(IOT) and Tera Hertz communication networks, design of hardware operable for short range communications with less power has become vital. As most of the such technologies employ wireless communication, antennas are to be designed accordingly. So, an antenna array which operates at 2.4 GHz and is useful to detect signals in ISM band is proposed...
Folded substrate integrated waveguide (FSIW) has been proposed for further size reduction, while keeping the advantages of traditional SIW. FSIW-based horn antennas are very promising in millimeter wave applications. To improve the bandwidth and efficiency of such antennas, a thick substrate is preferred but the microstrip feeding line becomes unacceptly wide to obtain a reasonable impedance. This...
Inspired by the development of electromagnetic band-gap (EBG) structures and metamaterials, Fabry-Perot resonator antennas (FPRAs) have been well studied in the recent decade. Such antennas are mainly composed of a Fabry-Perot resonant cavity and excited by a normal small antenna or an antenna array. A ground plane and a partially reflective surface (PRS) form the Fabry-Perot cavity. The advantages...
In this paper, a V-band low sidelobe and wideband series fed linear dielectric resonator antenna (DRA) array is proposed. Among many kinds of DRAs, the perforated rectangular dielectric resonator antenna (RDRA) is chosen as the antenna element in our design, which can enhance the impedance bandwidth by lowering down the quality factor. By optimizing the size of the slots and distance between adjacent...
Currently, the needs of communication system with a wide bandwidth is large enough. One antenna that can be used to realize communication with a wide bandwidth is log periodic antenna. To observe the effect of element length, the distance between elements, and the width of dipole elements used in log periodic antenna then do research to design and realize the antenna log periodic dipole array (LPDA)...
A novel low-profiled broadband multi-frequency double-layer patch antenna is proposed in this paper, which operates in GSM900, DCS1800 and Wifi. Considering the broadband, directivity, and low-profile of the antenna, seven patches with different resonant frequencies are placed together on one plane. These patches are arranged to have line polarization and are perpendicular to each other. By forming...
A simple E-shaped patch array antenna with low profile and high gain is proposed for the millimeter-wave wireless communication system. The proposed antenna can achieve the impedance bandwidth from 56.6 GHz to 64.5 GHz, which covers the unlicensed frequency of 60 GHz (57–64 GHz). The peak gain of the proposed array antenna is 17.92 dBi. The results show that the proposed antenna has great potential...
A dual-polarized horn antenna is proposed for K-band wireless communication in this paper. It has a common radiation aperture and two orthogonal wave ports. Hybrid feeding technology of waveguide and microstrip is adopted in the design. High isolation between the two ports can be achieved by adding the waveguide mode cut-off windows. The antenna is able to work well within the relative bandwidth of...
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