Geometrical structures and fundamental characteristics of microwave stepped-impedance resonators

Abstract

and x6 ϭ x9 ϭ 0.25 mm. The feed line is designed as a T-type with a gap of 0.15 mm and a width 0.6 mm. The simulation and measurement results of S-parameters are shown in Figure 9, in which the resonant frequencies at located at 2.38 GHz, 3.92 GHz, and 5.95 GHz with relative bandwidths of 6%, 7.5%, and 5.3%, respectively. The corresponding insertion losses are lower in this structure, which are Ϫ2 dB, Ϫ2.47 dB, and Ϫ2.67 dB.The results exhibit that the external Q-factors can be adjusted by changing the shape and the location of the feed line. In the same design, the external Q-factor at the third resonant frequency is the largest because of the weakest coupling.ABSTRACT: A simple means using rectangular patch antennas to feed a 2D planar Luneburg lens is presented. The lens together with the patch launching system is modelled using commercial 3D electromagnetic software. The Ϫ23 dB return loss, better than Ϫ20 dB port to port isolation of the patches, as well as 15 dB antenna gain and 5.3°Ϫ3 dB H-plane (lens plane) beamwidth indicate excellent lens performance potential at 23.3 GHz.

Power Divider Based on Stepped-Impedance Slotline

“…SIS has been studied and utilized in some designs, such as the resonators in [22,23,25] and the diplexers in [24]. However, study about applying SIS on power divider has not been done up to now.…”

“…Stepped-impedance slotline (SIS) [22][23][24][25] and one lumped resistor are introduced to improve the isolation between out-of-phase output ports. Simulated and measured results, which exhibit a good agreement, show that the proposed power divider has good return loss, high isolation, excellent phase balance, as well as flat group delay over the band 5 GHz-10 GHz.…”

A Folded Sir Cross Coupled Wlan Dual-Band Filter

“…1(b) by the dashed line connecting S and resonator 2/2 in band I/II. When the electric lengths of two sections of half SIR are equal, i.e., θ 1 = θ 2 = θ and we assume K = Z 2 /Z 1 , the input impedance of the folded SIR can be expressed as [14] …”

“…As an important part of the RF frontend, dual-band filter has become a hot research field [1][2][3][4][5][6][7][8][9][10][11][12]. Stepped Impedance Resonators (SIRs) are presented in the design of bandpass filters for its controllable spurious frequencies, simple structures and well-established design methodology [1,2,7,9,11,[13][14][15]. In [15] a tapped-line input/output structure was utilized to create transmission zeros, which expanded the stop band of the SIR filter.…”

Microstrip Nonuniform Impedance Resonators

“…However, there is a significant interest to design resonators with smaller (or larger) length than of the conventional resonators. The Stepped Impedance Resonators (SIRs) have been proposed [3][4][5] for this purpose, by now. SIRs are formed by connecting together two or three transmission lines with different characteristic impedance.…”