Miniaturization of RF SIC Filter on High-K Ceramic Substrate for STAR Application
Conference
Rahman, MR, Bojja-Venkatakrishnan, S, Pulugurtha, M et al. (2024). Miniaturization of RF SIC Filter on High-K Ceramic Substrate for STAR Application
. 105. 10.23919/USNC-URSINRSM60317.2024.10464506
Rahman, MR, Bojja-Venkatakrishnan, S, Pulugurtha, M et al. (2024). Miniaturization of RF SIC Filter on High-K Ceramic Substrate for STAR Application
. 105. 10.23919/USNC-URSINRSM60317.2024.10464506
Simultaneous transmit and receive radios (STAR) can maximize spectrum utilization, resulting in high data rate communication. However, practical STAR operation necessitates the implementation of multi-stage high-power self-interference (SI) cancellation, typically achieved through discrete hardware-based designs involving active components. For large bandwidth STAR radios, there are challenges in accommodating all SI cancellation stages in a smaller footprint. With this in mind, this paper presents a multi-stage compact STAR front-end module (FEM) that combines two stages of passive self-interference cancellation(SIC). Stage one is realized using a 4-arm spiral antenna, and the subsequent stage is realized via a custom-designed compact RF self-interference cancellation filter fabricated on a high-k ceramic substrate. This RF SIC filter is fabricated through Low-Temperature Co-fired Ceramic (LTCC) technology and incorporates a stub-loaded cascaded delay line. It is an innovative design that emulates a weighted coupled signal to be subtracted from the received signal, thereby achieving self-interference cancellation while maintaining a small form factor.
