Balanced dual‐segment cylindrical dielectric resonator antennas for ultra‐wideband applications

Abstract

Abstract:In this paper, balanced dual segment cylindrical dielectric antennas (CDRA) with ultra wide-band operation are reported. First a T-shaped slot and L-shaped microstrip feeding line are suggested to furnish a balanced coupling mechanism for feeding two DRAs.Performance of the proposed antenna was analyzed and optimized against the target frequency band. The proposed antenna was then modified by adding a C-shaped strip to increase the gain. The performances of both balanced antennas were characterized and optimized in terms of antenna reflection coefficient, radiation pattern, and gain. The antennas cover the frequency range from 6.4 GHz to 11.736 GHz, which is 58.7% bandwidth. A maximum gain of 2.66 dB was achieved at a frequency of 7 GHz with the first antenna, with a further 2.25 dB increase in maximum gain attained by adding the C-shaped strip. For validation, prototypes of the two antennas were fabricated and tested. The predicted and measured results showed reasonable agreement and the results confirmed good impedance bandwidth characteristics for ultra-wideband operation from both proposed balanced antennas.

An integrated dipole cylindrical DR antenna for UWB applications

“…Figure 1 shows that the two inverted L-sections work as a half wavelength dipole that is fed by the inverted T-shaped slot. As it was shown in [13], the length of the dipole can be given by ( L D = 2 L f2 + x ). This printed dipole is not adequately thin (L D / W f1 ≤10), and thus its resonance frequency can be found as in [13]:…”

“…(2) where ε re is the effective relative permittivity of the substrate [13 ]. The resonance frequency of an isolated single cylindrical DR excited in the TM 11m mode is given by [4,5]:…”

“…a balun, and the requirement for a twin excitation for the two DR's [13]. The balanced arms of the dipole, which are coupled to the dual DR elements of the antenna, are fed through a slot which is excited by an L-shaped microstrip line.…”

Metallic Reflector-Based X-Band Circularly Polarized Hollow Dielectric Resonator Antenna for High Gain in UWB Applications

“…If DR has low electrical permittivity with low Q factor vice versa to give widen bandwidth. DRA has outstanding characteristics like ease to excitation, low cost, high radiation efficiency, low surface losses, and a compact antenna with widen bandwidth, less conduction losses [5][6][7][8][9] that are the advantages over microstrip patch antenna. Different shapes of the DRA are reported in the literature survey [9][10][11][12][13][14], and also introduced hollow rectangular DRA (HRDRA) have mechanically simple lightweight with several characteristics and proposed in 1993 [15][16].…”

A Novel Compact Fractal Ring Based Cylindrical Dielectric Resonator Antenna for Ultra Wideband Application

“…The fractal structure offers wide impedance bandwidth which has been reported on rectangular, cylindrical and hemispherical DRAs [6,7]. Stacked DRA, dual-segment, hybrid DRA and slots in ground plane also well suited for improving the impedance bandwidth of DRA [8][9][10][11][12]. However, this makes the antenna bulky and less compact.…”