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ABSTRACT: 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 as a stepped-impedance lowpass filter. This avoids undesired radiation of the LO component and allows IF signal extraction in the down converting mode. Measured isotropic conversion gain (4.47 and 19.3 dB) supports the validity of the proposed solution in low-cost compact wireless transceiver applications.
Electronics Letters 02/2008; · 0.96 Impact Factor
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ABSTRACT: 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, rejecting the LO component while allowing the IF signal extraction. Unbiased operation is assured taking advantage of the low positive threshold voltage of Enhancement-mode PHEMT devices. Experimental results show the validity of the proposed solution for low cost and compact wireless reception.
Antennas and Propagation, 2006. EuCAP 2006. First European Conference on; 12/2006
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ABSTRACT: 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 different approaches have been carried out for beamsteering purposes: a variable capacitor has been added to control the resonant frequency and a left-handed (LH) structure has been introduced at the patch input to obtain two variable operating bands. The agreement shown in the results obtained using the proposed circuit structure, electromagnetic simulations and experimental measurements validates the model. Furthermore, simulations and measurements over the resonance control show very promising results
Electrotechnical Conference, 2006. MELECON 2006. IEEE Mediterranean; 06/2006
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ABSTRACT: Three identification methods of wavelets in a noisy environment are presented. The amplitudes and lifetimes of these small pulses vary in an uncertain way. The chosen wavelets are memorised. They are, however, not known at the receiver. They are identified by the authors, for a signal energy to noise energy ratio >or=1 dB.
Electronics Letters 03/1992; · 0.96 Impact Factor
