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A novel reconfigurable frequency translating antenna for cost-effective wireless transceiver applications is described. The integration of a dual transistor sub-harmonic mixing topology with a five-patch series arrangement enables the system to operate in resistive mode for reception or in active mode for transmission. The printed structure behaves as an antenna in the 1850 MHz frequency band and...
In this paper, an unbiased mixing antenna for wireless receiver applications is proposed. Thanks to the proper integration of a resistive subharmonic mixer in a five-patch series arrangement, a -4.47 dB isotropic conversion losses was obtained without the need for batteries. The selected printed structure behaves not only as a 1850 MHz band antenna, but also as a stepped-impedance low-pass filter,...
This paper presents two frequency converting PHEMT-based active antennas to be used in RFID applications. A proper characterization of the transistor nonlinear behavior revealed the existence of two biasing regions where the response signal, the second harmonic or the IF component, can be generated with maximum conversion gain and phase opposition. This attractive issue has been taken advantage of,...
In this paper, an exhaustive study of different equivalent circuits of an aperture coupled patch permits to develop a suitable circuit model. The vast majority of these models are able to reproduce the antenna behavior around the first resonance frequency, but the proposed equivalent circuit is also capable of duplicating the radiator input impedance in the two next harmonics. Over such model two...
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