Tunable compact microstrip dual‐band bandpass filter with tapered resonators

Abstract

By exploiting bended microstrip lines and tapered resonators, a new microstrip dual‐band bandpass filter (DBBPF) with tunable center frequency and compact size is proposed, analyzed, and fabricated. The LC equivalent circuit of the basic resonator is introduced to present an analytical description. The proposed filter has two passbands at the center frequencies of 2.4 and 5.7 GHz. The measured data show <0.22 and 0.56 dB insertion losses in the first and second bands, respectively, which are considered as a marked advantage. Furthermore, without increasing the circuit size, the second band can be tuned between 3.85 and 7.5 GHz. Finally, an acceptable similarity is observed between the simulated and measured S‐parameters.

Quasi‐elliptic dual‐band planar BPF with high‐selectivity and high inter‐band isolation for 5G communications systems

“…2 Moreover, dualband filter with wide stopband is essential for interference management, especially in the scenarios of heterogeneous wireless systems coexistence. [3][4][5][6][7] Use of a high-temperature superconductor (HTS) is one of the effective ways to realize a dual-band filter with these desirable characteristics, however, this technology is highly expensive, and the filter size is prohibitively large for portable applications. The simplest way to construct a dual-band bandpass filter (BPF) involves combining two single-band filters.…”

“…This requirement has created a demand for dual‐band microwave bandpass filters (BPF) that possess characteristics of sharp skirt and low insertion‐loss for the efficient and flexible utilization of the limited and expensive frequency spectrum . Moreover, dual‐band filter with wide stopband is essential for interference management, especially in the scenarios of heterogeneous wireless systems coexistence …”

Design of millimeter‐wave bandpass filters based on improved asymmetric parallel‐coupled microstrip line structure for direct detection system of CubeSat radiometer

“…Compared to the waveguide type, parallel-coupled microstrip line type bandpass filters have some natural advantages in circuit integration. However, most of the reported microstrip line bandpass filters were designed for low-frequency applications, [9][10][11][12][13][14][15][16][17][18][19][20] and so far, there are only few reports for MMW applications. In MMW frequency range, the circuit structures need to be shielded inside the rectangular cavity to prevent electromagnetic energy leakage and external electromagnetic interference.…”

A modified composite right/left‐handed unit cell for multiband applications

“…These TLs can be seen in recently reported microwave components such as filters, [1][2][3] power dividers, [4][5][6] antennas, 7 and power amplifiers. 8 The controllability of the dispersion diagram and the characteristic impedance of CRLH-TLs are the main feature of such lines that led to the design of improved microwave components in term of size and bandwidth.…”