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This paper presents two broadband Wilkinson power dividers (WPDs) using single layer microstrip lines. Operation of these WPDs from 2 GHz to 10 GHz could be achieved by using multisectional structure. Presented WPDs have 6 sections and differ in the size of the isolation resistors which have size of 0402 and 0603. For experimental verifications two devices were fabricated and the measurement results...
In this work; 7th order Butterworth, Chebyshev, Cauer (elliptic), Bessel, Legendre and Gaussian low pass filters designed, simulated, realized and measured with aid of iFilter tool of AWR Microwave Office. First, all the filters were designed with lumped L-C elements. Secondly, all lumped components were converted to the microstrip lines as series lines and shunt stubs. All microstrip line widths...
In this paper, a novel 3 dB 180° power divider/combiner is proposed. This device is derived from the classical Wilkinson divider/combiner whose output ports were combined with inverting and non-inverting suspended microstrip lines (SMLs). The proposed structure has a reduced size compared with the conventional and enhanced variants of the 3 dB 180° divider/combiner topologies. Moreover, the new architecture...
Power amplifiers (PAs) are used in the wide range of electronics such as RADAR, base stations, jammers and cable TV applications. These amplifiers can achieve design specifications like high efficiency and high output power (>20W) as much as the capability of the transistor. For this reason; Si LDMOSFETs, GaN HEMTs and GaAs HFETs are advancing their place in the market. In this article; GaN, Si,...
A high efficient GaN HEMT power amplifier with a new topology is presented for to be used at 3.4-3.7 GHz band. Short sections of the Microstrip-lines are used as harmonic traps at the load network in order to improve the efficiency. The fabricated GaN HEMT amplifier delivers 37.5 dBm saturated output power and the maximum power-added efficiency of 80% and a maximum drain efficiency of 83% are obtained...
In practical applications, compensating the changes in transistors input and output impedances due to environmental and thermal effects requires tunable matching networks. Having tunability property is critical in manufacturing as well, since manufacturing errors may be compensated by post-production tuning. In this paper, a 12–50 Ω impedance transforming filter over 800–2200 MHz frequency band is...
In this work, a 10 Watt inverse class-E power amplifier has been proposed, simulated, realized and measured for the 2.7–2.9 GHz wireless applications. In the proposed power amplifier topology distributed elements were used instead of lumped elements and their widths and lengths were optimized with AWR Microwave Office. The new architecture showed 80% power added efficiency and 10W output power during...
In this letter, a compact 3 dB 180° hybrid coupler was proposed, designed, fabricated and measured. This device was derived from the classical hybrid ring coupler whose 3λ/4 section was replaced with inverting suspended microstrip line (SML). The proposed structure has a reduced size compared with the conventional and enhanced variants of the 3 dB 180° hybrid coupler topologies. Moreover, the new...
A compact, wideband, vertically polarized two-element sum/difference antenna with a suspended microstrip-line hybrid coupler is proposed, designed, fabricated, and measured. The antenna array has two independent ports that provide the sum and difference pattern. Therefore, it gives opportunity to detect the direction of an unwanted signal by comparing the signal levels. The simulated and measured...
In this work, a dielectric resonator stabilized oscillator with output frequency at 7.7 GHz is designed, simulated and measured. The oscillator topology is based on the series feedback dielectric resonator oscillator (DRO) structure. The precise design procedure of the series feedback dielectric resonator oscillator is presented. A λ/4 open stub microstrip line is arranged at the output port in order...
The 180° hybrid coupler are among the most fundamental building blocks in radio frequency circuits and microwave integrated circuits. These couplers can be found in many applications, including dividers and combiners, modulators and demodulators, balanced mixers, balanced power amplifiers and in the feed network of antenna arrays. The 180° hybrid couplers exhibit some advantages, such as its simple...
This paper presents a novel wide band microstrip coupler, composed of two parts. The first one is a compensated Wilkinson power divider which provides a good separation between the two output ports. The second is a passive phase shifter composed of two filters consisting of 3 dB 180° hybrid couplers, the coupled and transmitted port being short circuited or open circuited on the bottom and top surfaces...
Among power amplifiers, Class E circuits are very suitable for high efficiency power amplification applications in the radio-frequency. However, because of the single ended structure, these circuits suffer significant harmonic contents in the output and it is usually inevitable to design load matching networks very carefully to get low harmonic content. In this paper, the design of a balanced Class...
Among power amplifiers, Class E circuits are very suitable for high efficiency power amplification applications in the radio-frequency. However, because of the single ended structure, these circuits suffer significant harmonic contents in the output and it is usually inevitable to design load matching networks very carefully to get low harmonic content. In this paper, the design of a balanced Class...
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