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A fully functional internal DTV diversity antenna has been designed and tested. The proposed internal balanced dipole antenna was integrated with a DTV module in a notebook computer. The results demonstrate that a balanced dipole antenna for noise suppression and diversity reception enable high quality reception of a DTV signal even though we trade-off some antenna performance after packaging in notebook...
A low-profile, wide-band antenna array with side-lobe control is presented. The array consists of tapered slot elements fed by a planar microstrip power divider. The power divider incorporates two- dimensional amplitude tapering through a series of unequal T- junctions which gives side-lobe levels of -20 dBi. The number of elements in the array is 8 by 8, and it operates from 12 GHz- 18 GHz. Measured...
The experimental results of the path loss characteristics for intra-car communications in the 2-GHz band and that for inter-car communications for the 5-GHz band in actual high-speed train cars using the THSR were presented. The measured results for intra-car communications indicated that the path loss in train cars is less than that in free space, and indicated a waveguide effect in a confined space...
This paper shows channel models on path loss and power delay profile for wireless body area networks. These models were derived from measured channel transfer functions by using a vector network analyzer. The path loss models were obtained for the frequency bands of 430, 611, 953, 2450 MHz, and UWB band. A power delay profile model was given only for the UWB band because typical symbol duration of...
A coplanar wave guide (CPW) fed semicircular slot antenna (SSA) with step impedance transformer is presented. Omni-directional radiation pattern in whole band with theoretical gain of 3 dBi with variation of plusmn0.5 dB is achieved. It has shown that this design of SSA gives experimental bandwidth of 10.7 GHz for VSWR < 2. Present results show suitability of structure for UWB communication.
In a communication satellite, multiple frequency bands are used for transmitting and receiving communication, data and tracking signals. In this paper we present design, analysis and test results of a dual-aperture coaxial multiband feed horn. The coaxial configuration is particularly useful for the frequency bands that are widely separated. Our design goal was to operate at S-, Ku-, K- and Ka- bands...
The Expanded Very Large Array (EVLA) project is currently under way to upgrade the Very Large Array (VLA) to improve the sensitivity, bandwidth, spectral resolution and frequency coverage of the existing array of 27 radio telescopes. The EVLA receivers will provide continuous frequency coverage from 1 GHz to 50 GHz. Three of the cryogenically cooled EVLA receivers will provide octave band coverage...
In this paper, we demonstrated that hallway propagation is driven by multiple wall reflections leading to high received field in both LoS case and non-LoS case at hallway junctions due to multiple corner diffraction. The result was verified by T-shaped hallway measurements. Based on the simulation results, it was shown that a repeater system with 30 dB total gain can enhance propagation around hallway...
The development, manufacturing and test of dual circular polarized probes with up to 1:2 bandwidth has been discussed. Preliminary measurements with ldquoidealrdquo BFN show that the design is compliant with the specification.
The requirements, design, and performance of the Juno Microwave Radiometer patch array antennas were discussed. The antennas meet both the electrical performance and environmental requirements. There is generally good agreement between measurements and calculations.
In this paper, the DVB-H antenna for the UHF band (470 ~ 862 MHz) is designed as an intenna for the potable media player (PMP) applications. The authors used 3-dimensional inverted L-shaped monopole for the wideband operation. Also, we used simple broadband matching circuit which is composed of the chip inductors and capacitors. The antenna peak gain is higher than 0.3 dBi in overall UHF bands (470...
The design, simulation and implementation of low frequency electromagnetic devices on planar structures are given. Planar devices and components are designed and built on a ceramic-based material that allowed a surface-mount (SMT) application. Method of moment based electromagnetic field solvers are used to verify the design of the devices. Planar devices and components are then implemented and tested...
This paper presents a detailed comparison of the results of a 3D FDTD numerical model and experimental measurements of the antenna response of a microwave tomography system. The FDTD algorithm uses the thin-wire approximation to model the antenna structure and a resistive voltage source is used to excite the signal. The algorithm was validated against experimental data obtained for an array of monopole...
Multi-band antenna covering GSM850/GSM900/DCS1800/PCS1900/UMTS2100 in mobile phones is presented. The proposed antenna is kind of a modified PIFA which consists of PIFA and T-branch. The bandwidth in low and high band is achieved using gap coupling between low and high band arm. And also bandwidth in low-band is improved by the coupling between T-branch and metal ring along the edge of the housing...
In this paper, the effects of parameters of substrate and ILH-MSA structure on radiation performances have been analyzed firstly, and then the available ranges of the parameters are given to ensure radiation performances of ILH-MSA. Secondly, an ILH-MSA operating at 1.6GHz is designed and fabricated as an example. Experiment results show that, the area of the present ILH-MSA is 49% of that of traditional...
In this paper, a complete set-up to subway radio propagation measurement at L and C Band is presented. This set-up has been tested at a real subway tunnel with a special structural characteristics allowing propagation path loss measurements and MIMO analysis in order to study the best system configuration working in subway environments. Therefore, the next step is to present a new measurement camping...
A compact linear pyramidal horn array for a personnel avoidance radar system for robotic vehicles was designed, fabricated and measured. The array will be used as the receive antenna in a system that is presented in a companion paper. The horn array is fed with a waveguide power divider that is designed to produce the required Taylor aperture distribution on the array front. The tapered aperture produces...
Circularly polarized (CP) antennas are attractive to wireless communications applications simply because less strict orientations are required for mobile stations (the end user) with respect to base stations. To achieve CP operation, many designs of patch antennas have been reported in the literature. However, for the designs utilizing dielectric substrates, single-feed, single-element patch antennas...
In this paper, we perform an experimental investigation of an UWB antenna. We have explored a modified shape antenna based on a binomial curve law. In simulation, this antenna achieved the desired UWB bandwidth. This paper is about experimental investigation of this modified monopole. Measurements reveal a frequency response from 3GHz to 10GHz with a return loss below -lOdB. Radiation patterns are...
Seven GHz bandwidth around 60 GHz frequencies has been released to develop high- rate short-range wireless data communication for a small area such as an office or a research lab. A regular propagation phenomenon in such environment is the shadowing of the Line-of-Sight (LOS) link caused by moving people. One research shows this phenomenon disconnects the LOS link for 2% of the time; however, the...
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