Compact dual‐band filtering power divider with independently controllable bandwidths using shorted patch resonators

Abstract

This study presents a novel dual‐band filtering power divider (DB‐FPD) structure with independently controllable bandwidths for dual‐band application. The proposed DB‐FPD structure is constructed by shorted G‐ and T‐shaped patch resonators, and meandered slot lines are etched on shorted patch resonators to generate resonance in the upper band. The 3 dB fractional bandwidth (FBW) of designed DB‐FPD structure in a lower band (upper band) can be adjusted from 5.2 to 24.2% (3.1 to 26.9%), respectively, using a substrate of 31 mil thick TLY‐5. The even‐/odd‐mode method is adopted to demonstrate the power splitting and isolation performances. The lumped‐element equivalent circuit is extracted to explain the power splitting transmission performance. Also, the coupling matrix analysis is applied to present the detailed design procedures for practical DB‐FPD, with specific passband bandwidths and centre frequencies of dual passbands. Finally, the isolation performances are analysed with different isolation resistor values and loading positions. For verification, two DB‐FPDs with equal absolute bandwidths (ABW) and equal FBWs are simulated, fabricated and measured for dual‐band WLAN application. The measured results agree well with the simulated ones, exhibiting a favourable frequency selectivity and controllable passband bandwidths.

Unbalanced Two-Way Filtering Power Splitter for Wireless Communication Systems

“…Hence, an external frequency selective device needs to be physically connected to the power divider, leading to increased size and higher insertion loss when compared to the FPS presented in this paper. Integrated filtering power dividers exhibiting dual/multi-band filtering characteristics has also been reported [12][13][14].…”

“…Hence, results can easily be reproduced by researchers or design engineers all over the world just by simply choosing their design specifications and utilizing the proposed formulations. Another benefit of the proposed work, when compared to those reported in [6][7][8][9][10][11][12][13][14] is it does not rely on tuning and optimization to achieve matching at the three input/output ports. Microstrip technology is used in the implementation of the FPS in order to validate the circuit model through layout simulation.…”

Dual‐band bandpass‐filtering high‐efficiency power amplifier with second harmonic suppression

“…A novel dual‐band highly efficient PA with the dual‐band filtering response is presented, 10 but the efficiency at one band is only 47%. Furthermore, the harmonic suppression of the dual‐band bandpass‐filtering PA is not concerned 9–12 …”

Design of compact planar power divider with wideband bandpass response and high in‐band isolation

“…To accommodate this trend, the method of integrating multiple functions into a single device is emerging. One such design, the power dividers (PDs) with high frequency selectivity, usually called the filtering power dividers (FPDs), have been attracting much attention due to the indispensable filters and PDs in the radio frequency front end modules [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

“…Unfortunately, this method is the lack of advantages in terms of size reduction due to the direct cascading form. The second method shown in Figure 1(b) is to respectively replace the quarter-wavelength lines in the conventional PDs with two identical filtering networks which are commonly composed of various single-mode or multimode resonators [4][5][6][7][8][9][10][11][12][13]. Obviously, owing to the flexibility, this method is widely used among those designs of the narrow-band, wideband, dual-band and multiband FPDs.…”