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A novel wrist conformal dual-band antenna structure is proposed for application in watch-type wireless devices. Simulation results show that this structure can achieve good performance in dual GSM bands and high efficiency when worn on hand. Based on this structure, a dual-element diversity antenna is also proposed. More research regarding this novel structure will be done in the future.
A three port triple band aperture coupled microstrip antenna has been designed, manufactured and measured. Effective impedance matching has been achieved in desired bands of operation in good agreement with the simulated results.
An X-band conformal array antenna designed for the use of unmanned aerial vehicles with polarimetric radars/sensors is presented. The array antennas mounted on the cylinder with various curvature radii are experimentally studied. The array can be easily placed on the aircraft fuselage or payload due to its ultra-thin and ultra-lightweight characteristics. It should have potential applications in radar...
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...
We present the idea of a simple frequency reconfigurable patch antenna that operates at multiband from 2 GHz to 4.5 GHz in this paper. By changing the position of the microstrip connecting elements on the antenna patches, the operating frequency will shift with fixed radiation patterns. Both simulated and measured results are provided and shown in good agreement.
A new multiband antenna based on the traditional fractal equilateral Sierpinski monopole is presented in this paper. Sierpinski monopoles are resonant, log-periodic and multi-band antennas. For example, a traditional two-stage Sierpinski monopole provides three bandwidths. In this work, two of these bandwidths are increased adding four conductor triangles to a traditional two-stage Sierpinski monopole...
This paper presents the design of a multi-band, closed spaced Yagi antenna which consists of a folded driver and multiple helical-shaped directors. If one or more straight directors are added to the folded driver, more than one resonant frequency is observed. However, the maximum realized gain and the front-to-back ratio at each resonant frequency are not good because radiation from directors interfere...
A novel tunable antenna is proposed to provide ultra-wide tunable range with a high selectivity. A reconfigurable matching network is implemented to achieve impedance matching at desired frequency of semi-ultra wideband (S-UWB) antennas, which can be designed in a straight forward manner. The L-C series matching network is chosen to demonstrate the performance by simulations. The simulation results...
In conclusion, a novel planar PCB multiband antenna with parasitic element is proposed in this paper. Using only two simple radiating elements, the antenna operates with three separate resonant modes, covering six popular communication bands. The antenna area only occupies a small physical space (18 times 37 times 0.6 mm3). This simple planar PCB structure makes the antenna fabrication very cost effective...
We have proposed and validated through simulations the possibility to interleave two pyramidal multi-band antennas. This new design enables to overcome bandwidth limitation problems as only one trap is now needed per radiating element on the radio navigation antenna. The feeding network is simplified as the two applications are now separated and polarizations can be defined independently for the two...
In this paper, a compact CRLH antenna which consists of an LH line and an RH line which have different frequencies is presented. Thus dual band operation is possible, and the frequencies can be easily changed by altering LH or RH line parameters. Impedance matching can be adjusted using the stub length. Because of its small size, printed form, dual band operation, this antenna can be utilized in mobile...
The geometry and numerical results of a dual-band circularly polarized microstrip antenna with two isolated outputs have been presented in this paper. Good return loss has been obtained for both frequency bands. Moreover, a gain response with a strong suppression in the frequency range located between both Galileo bands has been achieved. Due to its high level of integration and high of out-of-band...
The proposed LCP MMMB Wibro MIMO antenna has a good bandwidth (VSWR 3:1) performance at the band of Wibro1/Bluetooth and GPS/Wibro2. It is also got the average radiation efficiency more than 30% except Wibro1. However, it could be improved by a little antenna matching tuning on the mobile handset. This antenna can be also used switchable because of two signal lines.
Printed reflectarray applications are significantly increasing in recent years, because they represent an ideal antenna solution, having the same radiating performances of the standard parabolic reflector, but with reduced thickness, since the reflecting surface is planar. Here, we present the preliminary analysis of a prototype dual band planar antenna, realized using the reflectarray technology...
This paper presents a reflectarray configuration which supports the operation of six frequency bands. The proposed reflectarray has two substrate layers and each layer accommodates array elements of three frequency bands. Reflection phase curves of the array elements of different frequency bands are simulated. Interactions among elements are also explored.
A printed dipole antenna with a parasitic element of dual-band operation is proposed for WiMAX applications. The lower-operating band is obtained from dipole arms. By using the technique of coupling dipole arms and a parasitic element is proved to form a dual-band operation. The proposed antenna was successfully implemented and verified. It also has a compact size and good radiation performances.
Multiple-input multiple-output (MIMO) technology is a technique which can increase capacity by exploiting multiple antennas in transceivers without the need for extra spectrum or transmit power. This technique is expected to be employed in handheld devices as high bit rate intensive applications become more popular, such as internet access, high definition signal transmission or on-line gaming. However,...
This paper presents a single feed small size multi-frequency band antenna. The antenna is composed of several folded conducting strips and an L-shaped ground plane. Simulated and measured results show that in addition to a lower frequency band for 700 MHz band wireless applications, the antenna can operate at higher frequency bands of GSM/800/900/1800/1900 and UMTS 2100 and the antenna feature high...
This paper describes the development of a dual frequency, circular polarized feed which operates over the S/X frequency bands. The feed is incorporated into a 12 meter Cassagrain reflector system for use in radio astronomy applications. The selected design consists of two separate feeds assembled in a coaxial configuration. The inner circular waveguide is used for X-band and the outer coaxial circular...
The design of a novel dual-band PIFA of compact size for WLAN application has been presented. This new miniaturized PIFA is capable to operate in dual-band that cover 2.4-2.4835 GHz band for 802.11/b/g and 5.15-5.825 GHz band for 802.11a (indoor and outdoor) for application. The operation in the upper band is achieved by the introduction of a ground slot which is excited by the same feed used for...
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