A dual-band RF transceiver for multistandard WLAN applications

High-Order Dual-Band Bandpass Filter With Independently Controllable Frequencies and Bandwidths

“…With the ever-increasing demand for these applications in the communication market all around the world, dual-or multi-band filters have enabled a single wireless system to support dual-or multi-band operations in [1]. To meet the needs, much research regarding them has been carried out and various design approaches have been proposed.…”

A New Triple Band Circularly Polarized Square Slot Antenna Design With Crooked T and F-Shape Strips for Wireless Applications

“…Also the proposed antennas in this paper has the capability of showing CP characteristics in the important standards such as IEEE 802.11b/g (2.4-2.484 GHz), IEEE 802.11a (5. 15-5.35 GHz and an additional band of 5.725-5.825 GHz), and HiperLAN2 (5.47-5.725 GHz) [28,29]. …”

A 2.4 /5.2-GHz Dual Band CMOS VCO using Balanced Frequency Doubler with Gate Bias Matching Network

“…Until now, the multi-band RF systems for 2.4 GHz (2400~2483.5 MHz) and 5.2 GHz (5150~5350 MHz, 5725~5825 MHz) wireless local area network (WLAN) have been reported in [1][2][3]. Designing the multi-band RF transceiver using multiple terminals requires high cost by its large size.…”

“…Designing the multi-band RF transceiver using multiple terminals requires high cost by its large size. For minimal hardware implementtations, the suitable approach is to design the RF transceiver consisting of concurrent dual band circuits such as LNA, Mixer as shown in [1,2]. One of the major issues in the dual band RF system is the design of a dual band VCO.…”

“…One of the major issues in the dual band RF system is the design of a dual band VCO. The dual band VCOs in the papers [1][2][3] were designed with a frequency divider, a switched resonator and a frequency doubler, respectively. The frequency divider method for the dual band VCO needs to design the VCO for higher frequency.…”