Wideband P-Shaped Dielectric Resonator Antenna

A novel P-shaped dielectric resonator antenna (DRA) is presented and investigated for wideband wireless application. By using P-shaped resonator, a wideband impedance bandwidth of 80% from 3.5 to 8.2 GHz is achieved. The antenna covers all of wireless systems like C-band, 5.2, 5.5 & 5.8 GHz-WLAN & WiMax. The proposed antenna has a low profile and the thickness of the resonator is only 5.12 mm, which is 0.06-0.14 free space wavelength. A parametric study is presented. The proposed DRA is built and the characteristics of the antenna are measured. Very good agreement between numerical and measured results is obtained

Balanced dual-segment cylindrical dielectric resonator antennas for ultra-wideband applications.

yesIn 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

Two new types of compact ultra-wideband antennas for EMC measurements

We present two new types of ultra-wideband antennas for EMC measurements: the Eleven antenna and the self-grounded antenna. Both antennas have a compact size and can have multiple ports for flexibility in measurement tests. The radiation patterns of the antennas can be directional or of multi-beam. The antennas have a low manufacture cost and light weight, easy for installation, which is especially important for low frequency antennas

Quasi-TEM H-plane horns with wideband open hard side-walls

Quasi-TEM H-plane horn is usually designed with hard sidewalls to achieve uniform field distribution, but the hard walls limits its bandwidth. Here, open side walls based on the ridge gap waveguide are used to generate the hard walls. The concept is demonstrated numerically by an initial study on an H-plane sector horn. The horn achieves wider bandwidth than dielectric-loaded hard sector horns and has higher gain than normal smooth metal wall sector horns of the same aperture size and length

Quasi-TEM H-plane horns with wideband open hard side-walls

Quasi-TEM H-plane horn is usually designed with hard sidewalls to achieve uniform field distribution, but the hard walls limits its bandwidth. Here, open side walls based on the ridge gap waveguide are used to generate the hard walls. The concept is demonstrated numerically by an initial study on an H-plane sector horn. The horn achieves wider bandwidth than dielectric-loaded hard sector horns and has higher gain than normal smooth metal wall sector horns of the same aperture size and length

Packaging of microstrip circuits using bed of springs to suppress cavity modes - a replacement for bed of nails

The bed of nails has been demonstrated to be very useful in the design of new confined gap waveguide appearing between parallel metal plates with texture, as well as for removing cavity modes in microstrip circuit packages. As the bed of nails is bulky at low frequencies due to the required height of the nails, a new version of this periodic structure is proposed herein, based on helices instead of nails. Thus, the bed of nails is replaced by a bed of springs. The bed of springs is much more compact for use at low frequencies, and its bandwidth turns out to be similar. Thus, the new spring mattress approach is more comfortable than the Fakirs bed of nails at low frequencies