Dual Band High Efficiency Class Ce Power Amplifier Based on CRLH Diplexer

Abstract

Abstract-In this paper, the most adequate architecture to implement dual frequency amplifiers is shown. Composite Right/Left Hand (CRLH) and Extended Composite Right/Left Hand (ECRLH) transmission lines are studied and evaluated to find the most suitable structure for dual band power amplifiers. As an example, the performance of a class CE amplifier, working in TETRA and GSM frequency bands, is compared with simulations and measurement, showing good agreement. INTRODUCTIONThe increasing demand for wireless systems requires the use of higher frequency spectrum. Such high frequencies entail two major drawbacks: First, line transmission losses increase significantly. And second, solid state devices present power limitations at radio frequency (RF). Besides, when high RF power is demanded, there are some problems related with conventional system design and implementation, which can be overcome combining several RF devices to achieve the desired level. Another problem arises from the need of multifunction transponders to cope with several services, usually allocated at different frequencies, in the only terminal, being a well known example multiband or even GPS mobile phones. As a result of all these drawbacks, the development and use of multi-frequency highperformance power amplifiers is required. In this paper, TETRA Corresponding author: V. Gonzalez-Posadas (vgonzalz@diac.upm.es).

Analytical Modeling of the Printed Dipole Antenna Loaded With CRLH Structures

“…In [4] a CRLH microstrip delay line, which simultaneously exhibits negative refractive index and negative group-delay, has been presented. CRLH and Extended CRLH (ECRLH) transmission lines have been studied and evaluated to find the most suitable structure for dual band power amplifiers in [5]. In [6] a leaky wave antenna consisting of microstrip transmission lines has been presented.…”

LARGE SIGNAL EQUIVALENT CIRCUIT MODEL FOR PACKAGE ALGaN/GaN HEMT

“…The impedance matching circuits are shown in Fig. 7(a), and the final circuit is made on the substrate of ROGERS 4350 [16,17].…”

A Class E Power Amplifier With Coupling Coils for a Wireless Power Transfer System

“…However, the PAE is degraded by the switching transistor on-resistance, losses in the output filter and matching network, and discrete components for the dc feed and additional output capacitance [8]. In addition, it is practically difficult to optimize the performance of the amplifier on these bands due to the restriction of the components in high power applications [9]. This paper proposes a class E power amplifier (PA) for use in a WPT system.…”