A novel triple‐band microstrip bandpass filter for wireless communication

Abstract

fabricated, and measured. Measurements verify that the insertion loss below Ϫ2 dB is from 3.5 to 4.2 GHz. This compact CPW bandpsss filter with good transmission performances is potential to high-density microwave CPW circuit applications. REFERENCES 1. V.G. Veselago, The electrodynamics of substances with simultaneously negative values of and , Sov Phys Usp 10 (1968), 509 -514. 2.

A triband bandpass filter with low loss and high band selectivity using the split‐end asymmetric stepped impedance resonators

“…A comparison between the various published triband BPFs and the proposed filter is shown in Table . Although the size of the proposed filter is larger than , the insertion loss and the return loss of three passbands are approximately better than the others. The superior features indicate that the triband BPF has a potential to be utilized in triband applications.…”

A New Tri-Band Bandpass Filter for Gsm, Wimax and Ultra-Wideband Responses by Using Asymmetric Stepped Impedance Resonators

“…A slight mismatch between the simulated and measured results, especially for the second passband with 1.8% frequency shift, might be due to the fabrication errors or the variation of material properties. We compared the proposed filter with other reported tri-band filters [7,15,16], as summarized in Table 2. First, it is noted that our filter is the first triband design having two narrow bands and a UWB band.…”

“…In topologies of filter design, substrate integrated waveguide (SIW), multi-mode ring resonators, stub loaded resonator (SLR) and stepped-impedance resonator (SIR) are widely used to realize the multi-band responses [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In [1], the tri-band Chebyshev filter and dual-band quasi-elliptic filter with inverter coupling resonator were demonstrated with SIW technology.…”

“…Many tri-band filters have been realized with the SIRs since their multi-modes property is very popular in realizing multi-band responses [10][11][12][13][14][15][16][17][18]. Stepped impedance resonator has high design freedom of selecting the length ratio (u) and impedance ratio (R) in the structure to achieve the desired frequencies.…”

Novel microstrip dual‐band bandpass filter with wide stopband and high isolation

“…Z 1 , Z 2 , and θ 1 , θ 2 are the characteristic impedance and electrical length of high‐impedance and low‐impedance section of the SIR, respectively. The fundamental resonant frequency and the first higher order resonant frequency of the resonator, f 1 and f 2 , are determined by [7] where R z is the impedance ratio of the SIR defined as …”