dc.description.abstract | This thesis proposes a compact and high-isolation microstrip quadruplexer power divider.
One of the circuit consists of two traditional half-wavelength resonators C-type, another of the circuit consists of a half-wavelength resonator and a quarter-wavelength resonator with short end, the other of circuit consists of a dual-mode resonator with a via hole replace inductor. In this thesis, three different circuit architectures are designed using the different resonator. These circuits can use the Chebyshev prototype parameters to design the bands systematically.
The first circuit is a quadruplexer. There are two traditional half-wavelength resonators on a 0.41 mm Rogers4003C substrate with a relative permittivity of 3.55 and a loss tangent of 0.0027. In order to matching circuit by coupling feeding line, output feeding lines and uniform resonator pairs. Finally, the output ports add wilkinson power divider to achieve design concept.
The second circuit is asymmetric. It consists of a half-wavelength resonator and a short-end quarter-wavelength resonator. Due to the asymmetric structure, the harmonic response is suppressed and the circuit area is reduced.
The third circuit uses a dual-mode resonator to design a filtering power divider. Similarly, the output ports add wilkinson power divider to implement. Through the change diameter of via hole and the gap of the coupling structure, the achievable bandwidth of the circuit is adjusted.
Compare to the three circuits area, the last proposed is smallest. The center frequencies of four pass-band are 2 GHz, 3 GHz, 4 GHz, and 5 GHz.
In this content, the design process of the quadruplexer power divider is recorded in detail and implemented to verify the design concept. The advantages and disadvantages of the three circuits are compared. | en_US |