An efficient formulation of a 1-D modal PML for waveguide structures

✍ Scribed by Kyung-Young Jung; Hyeongdong Kim

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 178 KB
• Volume: 21
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19990405)21:1<48::aid-mop14>3.0.co;2-g

✦ Synopsis

The design, de¨elopment, and testing of a low-cost L-band hybrid-coupled 90Њ phase shifter are presented. The de¨eloped phase shifter uses a compact branch line coupler to minimize its size, and employs low-cost UHF band p-i-n switching diodes to minimize its production cost. The diodes in a stand-alone configuration feature large stray capacitance, which make them a poor-quality open circuit in the re¨erse-bias state. An LC compensation technique is applied to tune out this capacitance and make the diodes applicable to L-band. The de¨eloped phase shifter exhibits less than 1.0 dB insertion loss, more than 15 dB RL, and "8Њ phase de¨iation o¨er 225 MHz centered at 1.6 GHz.