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Showing 1 to 12 of 12 for “"Antenna Feed"”.
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GPR propagation simulation and fat dipole antenna design
… The first application is investigating how antennas propagate. reflect, and the difference in transmit and receive signals in various ground media. Results of the ground penetration simulations done in FEKO (MoM- Method of Moment) is compared to Finite Difference Time Domain (FDTD) results …
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Array antenna synthesis including element and feed coupling
Precise radiation pattern control for an array antenna requires precise control of array element excitations. One application is that of low side lobe patterns. Classical synthesis methods for the desired pattern may not be realized in practice due to coupling effects. Coupling occurs in two forms: …
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Design and Analysis of a Cylindrical Dielectric Resonator Antenna Array and Its Feed Network
… need for smaller, lighter, more efficient antennas for commercial and military applications. One such antenna that meets these requirements is the dielectric resonator antenna (DRA). In recent years there has been an abundance of research on the utilization of the DRA as a radiating …
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Thermal design and analysis of the SKA SA MeerKAT Digitiser
… located in the pedestal of the radio telescope antenna structure to shield the incoming radio signal from being contaminated by the electromagnetic interference (EMI)/radio frequency interference (RFI) noise created by the Digitiser electronics. However, if a Digitiser could be placed near the …
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A UHF Multimode Array Feed for the Westford Radio Telescope
A novel UHF Multimode Array Feed (MMAF) has been created for MIT’s Westford Radio Telescope. The MMAF is a dual-linear focal plane array installed concentrically with the existing QRFH feed on the telescope, enabling a combined system capable of transmit or receive on UHF radar and satcom …
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Multi- Gigabit Patch Antenna Wireless Links: An Experimental Investigation.
… this, a wide bandwidth suspended patch antenna was developed and modelled using Agilent ADS software. Difficulties with the antenna feed were overcome using an integrated stub tuning method. Three antennas were designed to operate at centre frequencies of 2.4 GHz, 4 GHz, and 6 GHz, these …
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Time-Offset Fractional-N PLLs for Heterodyne FMCW SAR
… homodyne counterparts, and enable certain inter-antenna feed-through suppression techniques. Despite these advantages, homodyne receivers are more prevalent owing to advantages in size, weight and cost. Designed to address this dilemma, the miloSAR is believed to be the only heterodyne FMCW SAR …
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Dual band monopole antenna with harmonic suppression capability
… the demand for high performance multi-purpose antenna systems. Monopole antenna are well known for their compact size and low profile applications. The use of GSM and the ISM band frequencies at the same time by different devices require multiple antenna to support more than two frequencies. …
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Alternative Power Transfer for Passive RFID Systems in Challenging Applications
… that a monostatic RFID system with two reader antennas, one on the LG main fitting and one in the wing bay allows up to 64 kbits of data to be associated with each LG component. A 7 dB system margin allows data on each LG component to be updated wirelessly and will also enable a passive UHF …
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Development of Integrated "Chip-Scale" Active Antennas for Wireless Applications
… data networks (WLANs). Integrated microstrip antennas coupled directly to the RF electronics, offer potential advantages of low cost, reduced parasitics, simplified assembly and design flexibility compared to systems based on discrete antennas. However, the size of such antennas is governed by …
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Construction of FASR subsystem testbed and application for solar burst trajectories and RFI study
… and observational results are described. Three antennas of Owens Valley Solar Array (OVSA) have been upgraded with newly designed, state of art technology. The 1-9 GHz RF signal from the antenna feed is transmitted via broadband (45 MHz-9.5 GHz) optical fiber links to the control room. The RF is …
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On the accuracy of estimating input impedance of probe-fed air-substrate microstrip patch antennas using the theory of characteristic modes
… coaxial probe-fed, microstrip patch antennas with arbitrarily shaped patches. Such an antenna with an L-shaped patch is fabricated and experimentally measured, and a case study performed comparing the accuracy of the two methods. The results of both methods require a downward …