SIMULATION AND IMPLEMENTATION OF A NEW X-BAND 1:4 POWER DIVIDER/COMBINER BASED ON A NEW WAVEGUIDE <I>H</I>-PLANE FOLDED MAGIC-T

Abstract

Abstract-This paper presents the simulation and fabrication of a new power divider/combiner based on a new waveguide H-plane folded magic-T structure. Measurements of the fabricated magic-T confirm the accuracy of the optimization algorithms existing in the CST software (Genetic algorithm, Particle Swarm Optimization algorithm PSO etc.). The magic-T structure exhibits moderate bandwidth response in the frequency range of 8-10 GHz. Also, it shows that the return loss is better than −15 dB, the insertion loss about −3.4 dB, and the isolation between the two output ports better than −25 dB in the frequency range of 8.4-10 GHz, with good transmission phase characteristics. Based on this magic-T structure, a 1 : 4 power divider/combiner is simulated and tested. The measured results show that the insertion loss is about −6.5 ± 0.25 dB, the return loss less than −15 dB, the isolation among the output ports less than −25 dB, the combining efficiency about 89%, and the transmission phase differences are about ±2 • in the frequency range of 8-10 GHz.

Design of new wideband waveguide Magic‐T for X‐band applications

“…Magic-T is 40% that is significantly larger than the structures proposed in references [8,9] with 22.2% and 22% of bandwidth, respectively. Due to the importance of 20 dB RL bandwidth in high-power handling application, the proposed Magic-T has 36% of 20 dB RL bandwidth over the 8.15-11.7 GHz, which is significantly higher compared with references [6][7][8][9][10][11].…”

“…To highlight the advantage of the structure, the comparison between the proposed Magic‐T with the state‐of‐the‐art references is presented in Table 2. As it can be seen, 10 dB RL bandwidth of the proposed Magic‐T is 40% that is significantly larger than the structures proposed in references [8, 9] with 22.2% and 22% of bandwidth, respectively. Due to the importance of 20 dB RL bandwidth in high‐power handling application, the proposed Magic‐T has 36% of 20 dB RL bandwidth over the 8.15–11.7 GHz, which is significantly higher compared with references [6–11].…”

“…This K a ‐band coplanar E‐arm Magic‐T has 0.2 dB insertion loss (IL) and more than 30 dB isolation in total bandwidth, which is suitable for sum/difference network in monopulse applications. In reference [9] the folded waveguide Magic‐T was proposed for 8–10 GHz application, which has a return loss (RL) of <−15 dB. The high isolation (>30 dB) and low IL (<0.2 dB) features have been achieved by insertion of an l ‐shaped septum 10 and a metal disc cone 11 inside of Magic‐T waveguides for monopulse feed network.…”

Compact power divider with improved isolation and bandpass response

“…However, conventional magic‐Tee gets a large volume and its two H‐plane arms are arranged in opposite direction which limits its application in microwave circuits. A more practical way is to use H‐plane folded magic‐Tee as shown in Figure A, which is realized by folding or bending the two H‐plane arms to make them parallel with each other …”

“…A more practical way is to use H-plane folded magic-Tee as shown in Figure 4A, which is realized by folding or bending the two H-plane arms to make them parallel with each other. 11 Similar to waveguide H-plane folded magic-Tee, an Hplane folded SIW magic-Tee can be imitated as shown in Figure 4B. It is reasonable to believe that this structure will inherit high output ports isolation performance.…”