Bal Singh Virdee

Miniature Hook-Shaped Multiband Antenna for Mobile Applications

In this letter, a novel and compact printed monopole antenna is presented, which has a simple but effective radiating patch for multiband wireless communication systems and mobile devices. Operational bands covered simultaneously by the antenna include the following: UMTS (1920-2170 MHz), 2.4-GHz WLAN (2400-2484 MHz), mobile WiMAX (IEEE 802.16e 2500-2690 MHz), 5-GHz WLAN (5150-5350/5725-5825 MHz), and ITS (5795-6400 MHz). A parametric study is applied in the antenna design process to achieve the required operational frequency bands. Desired resonances can be tuned by adjusting the gaps between the radiating semicircular arms and central feed-line, as well as embedding a dielectric slot in the ground surface. The antenna has dimensions ~ 20×20×1 mm3, which is smaller than previously proposed monopole structures. The design concept was validated by fabricating the antenna prototype and measuring its characteristics. The measured results show the antenna exhibits omnidirectional radiation and appropriate gain.

Millimeter-Wave High-Gain SIW End-Fire Bow-tie Antenna

This communication presents a high-gain bow-tie antenna that operates across 57-64 GHz for application in high data rate point-to-point communication systems. The proposed antenna consists of a pair of bow-tie radiators, where each radiator is etched on the opposite side of the common dielectric substrate and fed through substrate integrated waveguide (SIW) feed-line. The bow-tie radiators are arranged to cross each other symmetrically by tilting the feed-lines by 30° to enhance the antenna gain and to obtain the required radiation pattern. The antenna is loaded with a pair of double G-shaped resonators (DGRs) that are located in a region between the radiators and SIW to suppress the back-lobe level in the H-plane. Embedded in the E-plane of the antenna is an array of zero-index metamaterial (ZIM) unit-cells whose purpose is to effectively confine the electromagnetic waves in the end-fire direction to enhance its gain performance. A prototype antenna was fabricated and its performance was measured to validate the simulation results. The proposed structure exhibits a gain of 11.8-12.5 dBi over the frequency range of 57-64 GHz with reflection coefficient less than

Ultra-Wideband Bandpass Filter Based on Composite Right/Left Handed Transmission-Line Unit-Cell

- 11\;\hbox{dB}

A Small Dual-Band CPW-Fed Monopole Antenna for GSM and WLAN Applications

. In addition, the proposed antenna exhibits good cross-polarization, which is less than

Beam Tilting Antenna Using Integrated Metamaterial Loading

- 17\;\hbox{dB}

One- and Two-Dimensional Beam-Switching Antenna for Millimeter-Wave MIMO Applications

in both E- and H-planes at 60 GHz.

Beam-Deflection Using Gradient Refractive-Index Media for 60-GHz End-Fire Antenna

This paper presents a novel high performance ultra-wideband (UWB) bandpass filter that satisfies FCC UWB specifications. The filter is based on a composite right/left handed (CRLH) structure consisting of an asymmetric unit-cell with a short circuited inductive stub that exhibits stopband rejection level greater than 25 dB at both the lower and upper band edges while maintaining an insertion-loss of less than 0.5 dB across its passband. In addition, a simple and effective technique is proposed to create and control sharp rejection notch-bands within the filters passband in order to provide interference immunity from undesired radio signals, such as wireless local area networks (WLAN) that co-exist within the UWB spectrum. The proposed technique was verified practically to validate the design methodology. The experimental results of the prototype circuit are presented and compared with the simulation results. The dimensions of the proposed filter are 0.37λ × 0.10λ (i.e., 16.4 × 4.8 mm2). The filters characteristics and compact size make it suitable for UWB systems.

COMPACT ULTRA-WIDEBAND PHASE SHIFTER

A unique and miniaturized dual-band coplanar waveguide (CPW)-fed antenna is presented. The proposed antenna comprises a rectangular patch that is surrounded by upper and lower ground-plane sections that are interconnected by a high-impedance microstrip line. The proposed antenna structure generates two separate impedance bandwidths to cover frequency bands of GSM and Wi-Fi/WLAN. The antenna realized is relatively small in size

PSO/FDTD Optimization Technique for Designing UWB In-Phase Power Divider for Linear Array Antenna Application

(17\times 20\ {\hbox{mm}}^{2})

A novel high efficiency multioctave amplifier using cascaded reactively terminated single-stage distributed amplifiers for EW system applications

and operates over frequency ranges 1.60–1.85 and 4.95–5.80 GHz, making it suitable for GSM and Wi-Fi/WLAN applications. In addition, the antenna is circularly polarized in the GSM band. Experimental results show the antenna exhibits monopole-like radiation characteristics and a good antenna gain over its operating bands. The measured and simulated results presented show good agreement.