A novel integration design of an internal UMTS patch antenna with an inset shielding metal case for a mobile device has been proposed. Prototypes of the proposed design applied to a PDA phone have been successfully implemented. Although the internal patch antenna is integrated with the inset shielding metal case, good impedance and radiation performances of the internal antenna have been obtained. In addition, it is expected that with the presence of the inset shielding metal case, a compact integration of the internal antenna and the nearby associated components in the mobile device can be achieved. The proposed design can thus lead to effective usage of the available circuit-board space in a mobile device.
A new dielectric resonator antenna (DRA) is proposed in this article for ultra‐wideband (UWB) application. A larger annular‐ring DRA is placed concentrically outside a smaller one to form a double annular‐ring DRA. The antenna is operating at the end‐fire mode. The effects of antenna parameters, such as the radiuses and heights of the dielectric resonators as well as the probe length are investigated. The proposed double annular‐ring DRA can offer an impedance bandwidth up to 3–11.2 GHz for a return loss less than −10 dB. The radiation patterns are stable in the passband. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 362–366, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22140
An equivalent circuit model of a tri-resonance wideband dielectric resonator antenna is presented to give a physical insight into the wideband behavior of the antenna. The well-known Levenberg-Marquardt Since a dielectric resonator (DR) was introduced as an antenna by Long et al. [1], dielectric resonator antennas (DRAs) have received much attention [2][3][4][5]. DRAs share many of the advantages of the microstrip antennas, such as small size, low profile, and light Figure 1The structure of stacked disc-ring dielectric resonator antenna weight. In addition, DRAs exhibit a relatively large bandwidth (ϳ10% for r ϳ 10), whereas patch antennas have a typical bandwidth of only 1-3% in their basic form. Moreover, DRAs avoid the inherent disadvantages of patch antennas, including high conduction loss at millimeter wave frequencies, and low efficiency due to the surface wave excitation. The research of the wideband DRA was first experimentally carried out in 1989 by Kishk et al. [6], who stacked two different DRAs on top of one another to obtain a dual-resonance operation. Since then other wideband DRAs using the stacked method have been reported [7][8][9][10]. Alternatively, coplanar parasitic DR elements were placed beside the DRA to increase the impedance bandwidth [11][12][13]. Moreover, some methods that need only a single DRA to achieve wideband operation were reported [14 -20]. Basic cylindrical or rectangular DRA configurations can be analyzed conveniently using the magnetic wall model or dielectric waveguide model, providing a good physical insight and facilitating computer-aided designs. Unfortunately, for the complex antenna structures such as the above stacked DRAs, a coupled system is formed so that the size of one resonator also influences the resonant frequency of the other. The full-wave analysis is often needed to give accurate results accounting for the coupling effects. However, the full-wave model can only give less physical insight. Typically, an equivalent circuit is derived to understand the physical operation mechanism. For the wideband stacked DRA, an equivalent circuit consisting of two parallel resonant circuits was developed using the curve fitting method in Ref. 10 along with the full-wave analysis to confirm the values of the individual resonators. However, no work has been done on more complex antenna structures, where more unknown parameters are to be decided, which increases the convergence difficulty of the curve-fitting problem.In this article, an equivalent circuit model for a tri-resonance DRA is proposed. The recently developed Levenberg-Marquardt algorithm is employed to improve the convergence characteristics [21,22]. The tri-resonance antenna is our previously reported wideband stacked DRA as shown in Figure 1 [21]. The equivalent circuit models for the antenna with different combinations of the antenna parameters such as dielectric constant, probe length, excitation position, and air-gap are provided to verify that the derived equivalent circuit model can give a good d...
A new balanced planar ultra‐wideband (UWB) antenna is proposed. First, a novel uniplanar broadband balun transition is presented. Then, a balanced UWB planar dipole antenna fed by the proposed balun is studied, and has a measured bandwidth from 2.8 to 11.2 GHz for the return loss better than −10 dB. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 114–118, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22040
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