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In order to fulfil strict design requirements for antennas in real products, a new approach to handset antenna design is studied. In the beginning, the shape of the antenna element is fixed and the actual design is done by adjusting the position of the feeding pins and by using passive circuit elements. The designed single-element antenna covers LTE frequency bands 698–960 MHz, 1710–2690 MHz, and...
Design of harmonic transponders is presented in a case when the harmonic operating frequencies are implemented with a separate matching circuit based on lumped components. The required frequency multiplication is generated by a diode, and both varactor and detector diodes are investigated. Benefits and drawbacks of the proposed design compared to completely self-resonant transponder antennas are considered...
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