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In this article, the phase diversity in a direct-conversion receiver for a UHF RFID reader is analyzed and optimal I/Q signal combining methods are presented with respect to tag modulation.
Software-defined radio is explored as a technique that can help test vendors keep pace with the rapid development of new standards in the communications market.
A miniaturized quarter-circular-slot UWB (QCS-UWB) antenna using field-pattern analysis of the circular-slot UWB prototype antenna is proposed. Even though the proposed antenna has only the quarter part of the prototype antenna it maintains UWB antenna characteristics. The measured gain of the miniaturized antenna from 3.0 GHz to 12.0 GHz is within -0.1 dBi ~ 1.6 dBi, which is comparable to the prototype antenna’s gain, -2.7 dBi ~ 3.1 dBi.
A four feeding microstrip antenna operating at 2.0 GHz and match to a 50Ω impedance designed using Agilent’s Advanced Design System (ADS) and Computer Simulation Technology (CST) simulation tools is presented.
Recent advances in Fresnel zone plate antenna technology, including sidelobe reduction and control over sidelobe location are explored, as well as the focusing resolution of Fresnel zone plate antennas for sub-wavelength focal distances.
The topic of much debate, WiMAX is rapidly becoming a growing market. With more and more service providers and enterprises jumping on the WiMAX bandwagon. The next step is to accelerate the deployment of WiMAX worldwide by leveraging the numerous benefits of wireless backhaul.
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