Design for SAW Antenna-Plexers with Improved Matching Inductance Circuits

• Published in: Micromachines (Basel) Vol. 15; no. 1; p. 89
• Main Authors: Yang, Min-Yuan, Wu, Ruey-Beei
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 30.12.2023; MDPI
• Subjects: Antenna design; antenna-plexer; Antennas; Antennas (Electronics); Bandpass filters; Bandstop filters; Capacitors; Circuit design; diplexer; Diplexers; Extractors; Frequency ranges; Frequency response; High pass filters; Inductance; Inductors; Manufacturers; Matching; Microwave devices; Microwave filters; optimization; Optimization algorithms; Performance evaluation; Product specifications; Resonators; SAW extractor; Smartphones; Surface acoustic wave devices; Surface acoustic waves; Wi-Fi; WIFI 6E; diplexer; optimization; WIFI 6E; antenna-plexer; SAW extractor
• ISSN: 2072-666X; 2072-666X
• DOI: 10.3390/mi15010089

This study designs antenna-plexers, including a surface acoustic wave (SAW) extractor and an upper- and mid-high band (UHB + MHB) diplexer, for LTE 4G and 5G bands using carrier aggregation. The SAW extractor combines a bandpass filter (BPF) and a band-stop filter (BSF) in a single unit that consists of eight modified Butterworth–van Dyke (mBVD) resonators that resonate in parallel with an inductor and SAW resonators. This BSF behaves as a high-pass filter at frequencies lower than the designed WIFI band and as a capacitor at higher frequencies. The SAW extractor meets product specifications in the frequency range 0.7 to 2.7 GHz. The UHB + MHB diplexer, which is composed of a microwave filter, a SAW filter, and a simple matching inductor, uses frequency response methods to create an RF component for 2.4 GHz + WIFI 6E applications. The design uses a SAW’s interdigital transducer (IDT) structure, and the experimental results are in agreement with the simulation results, so the design is feasible.