A miniature microstrip quad‐band filtering power divider based on quad‐mode resonators

Abstract

A miniature quad‐band filtering power divider (FPD) based on a quad‐mode stub loaded resonator (SLR) is presented. The quad‐band FPD is formed by a proper coupling topology between the open‐ended microstrip line and two pairs of quad‐mode SLRs. Moreover, to achieve good isolation, two resistors are mounted between the symmetrical SLRs with respect to the open‐ended microstrip line properly. The proposed SLR is analysed by the odd‐ and even‐mode analysis method, and four passbands are accordingly introduced. For demonstration, a quad‐band FPD centred at 1.20, 1.66, 1.89 and 2.16 GHz is designed, simulated, fabricated and measured. The measured results have good agreement with simulated ones, which validates the proposed design concept.

A simple design of low-loss quad-band Wilkinson power dividers

“…Applying Eqns. (14)(15)(16)(17)(18)(19)(20), impedances of the PD circuit in Fig. 6 Based on the above calculation results, the unequal quad-band PD is simulated using Keysight ADS software.…”

“…The disadvantages of this method include the use of an approximate method based on a complex optimization algorithm, and the scheme requires up to four isolation resistors, which exacerbate parasitic effects at high frequencies. In work [14,15], quad-band power dividers combined with filtering features were proposed. In [16], a quad-band power divider based on SIW technology was presented.…”

Miniaturised single‐layer bandpass filters using triple and quad‐mode patch resonators

“…Patch filters are widely researched and used due to their advantages of high‐power capacity and simple structure [1, 4–8]. Dual and triple‐mode filters can achieve compact sizes, which have gained more attention and research [9–27].…”