Summary
International Symposium on Antennas and Propagation
2008
Session Number:4B11
Session:
Number:4B11-3
Bandwidth Enhancement of a Class of Power Divider using Multiple Cascade Microstrip Hairpin Resonators
Mehdi. Nosrati, Tayeb. Faraji,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
Compact size and high-performance microwave elements are highly demanded in several communication systems. One of these elements is power divider for power division and/or combination. This element has wide applications in several microwave circuit such as HMIC and MMIC. Recently, several classes of power divider were proposed using parallel connection of a resistor, an inductor and a capacitor [1]- [2]. The use of spiral compact microstrip resonators cell (SCMRC) is an interested method to design of this element [3]-[4]. Further, in order to reduce the size and enhance the bandwidth of the microwave elements have suggested many solutions [5]-[6]. While, these methods give us a chance to have a small design area, they can not enhance the bandwidth. In [7], a dual-band power divider has been proposed using microstrip hairpin resonators. In this investigation, an interested solution has been proposed to reduce the size and cost of these elements. It consists of two quarter wavelength and a microstrip hairpin resonator. The use of connecting lines as a cascade two unit elements instead of the internal series stubs is a useful method to increase bandwidth in the digital elliptic filters [8]. The implementation of this method is very difficult in practice and needs suspended bars and dielectric shims. In [9], a model of coupled transmission lines has been proposed that has the simple structure and the same performance with it. In this paper, is tried to propose a structure for designing a power divider with enhancement of bandwidth using multiple cascaded microstrip hairpin resonators for the broad-band property that also has a same performance with a cascade two unit elements. An equivalent circuit model for the stepped-impedance hairpin resonators is described and a compact power divider using cascaded these resonators is designed. The exact dimensions of the power divider are synthesized by electromagnetic (EM) simulation and it is designed for a 3-dB cut-off frequency of 5 GHz on a 25-mil-thick substrate with relative dielectric constant εr = 9.6.