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In this paper we introduce a novel type of wide bandwidth branch-line power divider that does not require surface mount resistors, loads at the ports nor bond wires and hence it can be manufactured using traditional 2D photolithography. The circuit is implemented in microstrip technology and its BW is about 40% with a rejection below -14 dB. This divider is implemented on a corporate feeding network,...
This paper presents the development of a handset adaptive antenna using a constant modulus algorithm (CMA). The antenna is a switched-beam phased array antenna which can assist initialization of CMA. The method to improve convergence property of CMA exploits a beam with maximum received power from several switched-beams of the antenna as an initial beam. A square patch of one wavelength width provides...
This paper presented a steerable series-fed phased array architecture using zero-degree tunable positive/negative-refractive-index (PRI/NRI) phase shifters. Using PRI/NRI phase shifters centered around the 0deg mark makes the array capable of steering its beam off broadside. The patch antennas of the array are moved off the centerline of the main feed line allowing for the inclusion of impedance transformers,...
A microstrip antenna (MSA) has a number of useful properties. However, its narrow bandwidth characteristic is disadvantage in applying to practical wireless systems. Some of the conventional techniques for widening bandwidth for the MSA are using thick structures, adding parasitic patches or using electromagnetically coupled feed. In this paper, we proposed a folded inverted L-shaped probe (FILP)...
In this paper, a small antenna for the applications of GPS and DCS systems by utilizing the CPW feeding structure is proposed to provide the LP and CP radiation patterns. The CPW feeding structure possesses the advantages, such as low radiation loss, less dissipation, uniplanar structure without the ground plane, and easy integration with RF/microwave circuits, enabling a miniature hybrid or monolithic...
A wideband circularly polarized (CP) slot antenna with L-slot and L-shaped feed is designed. Wideband CP is obtained by truncating a corner of the antenna element, and by exciting the L-slot with asymmetric L-shaped feed line. This geometry introduces orthogonal components with quadrature phase difference to excite circularly polarized wave. The antenna attains an overlapped bandwidth (axial ratio...
A modified truncated square patch antenna of different quad L-shaped slits having electromagnetic coupling feed operating at S-band has been presented. The antennas are compact in size and exhibits linear polarization, in comparison to its basic truncated patch that has circular-polarization capability. It was found that all configurations operate well at their frequencies of operations, however,...
This paper proposes a T-shaped wide slot harmonic suppression antenna at the frequency of 4 GHz. Harmonic suppression is achieved by using a narrow microstrip-line-fed and a grounded T shaped conductor line. The return losses and radiation patterns of the antenna at fundamental and harmonic frequencies are measured and compared with those of the conventional T-shaped slot antenna.
0.95MgTiO3-0.05CaTiO3 high-permittivity ceramic have been applied in the fabrication of dielectric resonator antenna. The permittivity and quality factor of 0.95MgTiO3-0.05CaTiO3 have been characterized. The dielectric resonator antenna is fed with a mico-strip line. Fabricated dielectric resonator antenna was measured by an Agilent N5230A network analyzer. The measurement result of the antenna composed...
A printed reflectarray antenna consists of a feed and a planar array of microstrip patches. The performances of whole antenna system obviously depend on the radiation pattern of the feed. In order to enhance the aperture efficiency, a saddle-shaped pattern of the feed is required. In this paper, a one-dimensional (1-D) pattern synthesis for feed is performed by employing a coupled tapered slot-line...
In this paper, we propose a PIFA based multiband internal antenna that can support seven frequency bands. The antenna is designed to operate at GSM (Global System for Mobile Communications, 880-980 MHz), PCS (Personal Communication Services, 1880-1990 MHz), UMTS (Universal Mobile Telecommunications System, 1.9-2.17 GHz), WiBro (2300-2390 MHz), Bluetooth (2.4-2.48 GHz), S-DMB (Satellite-Digital Multimedia...
In this paper, the UHF RFID tag antenna which has a SRR as a radiating part and inductively coupled feeding method are analyzed and designed. By using a SRR, the antenna size can be reduced and using an inductively coupled feeding method, we can obtain a wide bandwidth and a simple matching technique to directly attach to a tag chip. Also equivalent circuit model of the tag antenna is presented and...
A novel wearable antenna for wireless communications is presented in this paper. This paper has discussed the possibility of employing a belt buckle as an antenna, bringing benefits such as removability and the ability to hand portable wireless devices from the belt itself. The antenna consists of a belt buckle, hinge, denim waist band and electrical connections. The antenna was fed by a microstrip...
A method to measure the radiation characteristics of portable antennas during their development stages using a human-equivalent phantom to suppress the undesired current leakage along the RF feeding cable has been proposed and investigated. The basic assessment of the 351 proposed method was conducted through radiation pattern measurements using a scale model phantom as well as FDTD simulations. The...
It is well known that a monopole antenna above a ground plane radiates an omni-directional beam around its axis. The height of this monopole can be reduced by using top-loading techniques. One such technique involves attaching a patch to the top of a monopole for use as a microwave antenna. In this case the structure is recognized as a low-profile, center-fed patch antenna. When the antenna height...
A broadband dual-polarized magneto-electric dipole with loaded dielectric substrate suitable for GSM 1800 and GSM 1900 systems have been designed and tested. Dual polarized antenna is popular in wireless communications as it employs diversity technique to combat multi-path fading for enhancing channel capacity. Two pairs of short-circuited patches are fed by four Gamma shaped probes (with the ground...
The UWB antennas are proposed for applications of communication systems, various kinds of antenna test ranges, and high resolution microwave imaging. The narrower instantaneous bandwidth of UWB antennas will degrade the performance of the above applications. By using different characteristic of geometries, structures and sizes, good impedance bandwidth and instantaneous bandwidth can be achieved for...
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