Putting the Radio in “Software-Defined Radio”: Hardware Developments for Adaptable RF Systems

Chappell, William J.; Naglich, Eric J.; Maxey, Christopher; Guyette, Andrew C.

doi:10.1109/jproc.2014.2298491

Cited by 92 publications

(32 citation statements)

References 58 publications

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“…With the rapid development of modern wireless communication services, wireless devices with dual7 /multi7band and multiple functions within a limited circuit area are increasingly in high demand [1].…”

Section: ! "mentioning

confidence: 99%

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Dual‐band filtering power divider with capacitor‐loaded centrally coupled‐line resonators

Dai

Wang

et al. 2017

IET Microwaves, Antennas & Propagation

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Section: ! "mentioning

confidence: 99%

“…Besides, for the filter design, the coupling coefficients and external quality factors should be considered. The coupling coefficients can be calculated as [20] where f 1 …”

Section: Even Mode Equivalent Circuit Of the Db Fpdmentioning

confidence: 99%

Dual‐band filtering power divider with capacitor‐loaded centrally coupled‐line resonators

Dai

Wang

et al. 2017

IET Microwaves, Antennas & Propagation

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“…In modern radio frequency (RF) communication systems especially for 5G implementations, information is being transmitted in rapidly varying spectral windows at increasingly higher frequencies 1 , requiring fast reconfiguration 2 and high-resolution RF signal processing 3, 4 to achieve high spectral efficiencies and agile communication systems. It is challenging for conventional RF electronics to keep up with stringent requirements of wireless communications such as high frequency agility, and reconfigurability.…”

Section: Introductionmentioning

confidence: 99%

High-resolution, on-chip RF photonic signal processor using Brillouin gain shaping and RF interference

Choudhary

Liu

Morrison

et al. 2017

Sci Rep

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Integrated microwave photonics has strongly emerged as a next-generation technology to address limitations of conventional RF electronics for wireless communications. High-resolution RF signal processing still remains a challenge due to limitations in technology that offer sub-GHz spectral resolution, in particular at high carrier frequencies. In this paper, we present an on-chip high-resolution RF signal processor, capable of providing high-suppression spectral filtering, large phase shifts and ns-scale time delays. This was achieved through tailoring of the Brillouin gain profiles using Stokes and anti-Stokes resonances combined with RF interferometry on a low-loss photonic chip with strong opto-acoustic interactions. Using an optical power of <40 mW, reconfigurable filters with a bandwidth of ~20 MHz and an extinction ratio in excess of 30 dB are synthesized. Through the concept of vector addition of RF signals we demonstrate, almost an order of magnitude amplification in the phase and delay compared to devices purely based upon the slow-light effect of Brillouin scattering. This concept allows for versatile and power-efficient manipulation of the amplitude and phase of RF signals on a photonic chip for applications in wireless communications including software defined radios and beam forming.

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“…They are driven by the emerging needs for commercial communication systems with multistandard operability and defense systems that can be flexibly adapted to unpredicted spectral conditions in the radio environment [1]. Tunable bandpass filters (BPFs) will be of paramount importance in these systems.…”

Section: Introductionmentioning

confidence: 99%

Single and Multiband Acoustic-Wave-Lumped- Element-Resonator (AWLR) Bandpass Filters With Reconfigurable Transfer Function

Psychogiou

Gómez‐García

Peroulis

2016

IEEE Trans. Microwave Theory Techn.

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New types of single-and multiband acoustic-wave resonator-based bandpass filters (BPFs) with continuously variable transfer function in terms of bandwidth (BW), selectivity, and out-of-band isolation (IS) are presented. They are based on single-/multiband resonant branches that are shaped by high-quality-factor ( Q) acoustic-wave-lumped-element resonators (AWLRs) and are connected in parallel to an all-pass network through variable impedance inverters. With the proposed configuration, quasi-elliptic-type passbands with wide fractional BWs (FBWs)-i.e., larger than the electromechanical coupling coefficient k 2 t of its constituent acoustic-wave resonator-can be realized and continuously tuned while preserving the high-Q characteristics of its acoustic-wave resonators. Furthermore, by reconfiguring the location of the transmission zeros (TZs) of the AWLRs, tunable out-of-band IS profiles and asymmetrical passband BWs can be created. The operating principles of the devised spectrally agile filter concept are demonstrated through coupling-matrix-based synthesis and linear-circuit simulations. They are experimentally validated at the UHF band through the realization of: 1) a three-pole/six-TZ single-band prototype at 418 MHz with tunable BW between 0.16 and 0.49 MHz (FBW: 0.5-1.5k 2 t ) for an insertion loss (IL) between 3.3 and 1.2 dB (i.e., effective Q > 10 000), reconfigurable order (firstto-third-order states), out-of-band IS controllability in terms of BW (18-26.5 MHz at the upper stopband) and magnitude (23-46 dB at 426 MHz), and an intrinsically selectable allpass mode and 2) a six-pole/nine-TZ dual-band BPF with two transmission bands located at 418 and 433.9 MHz. They, respectively, feature symmetrical and asymmetrical BW tuning between 0.3-0.54 and 0.6-1.23 MHz with in-band IL <1.7 dB for all tunable states.Index Terms-Acoustic-wave filter, bandpass filter (BPF), k 2 t enhancement, multiband filter, quasi-elliptic-type filter, reconfigurable filter, RF/microwave filter, surface-acoustic-wave (SAW) resonator, tunable filter. 0018-9480

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Putting the Radio in “Software-Defined Radio”: Hardware Developments for Adaptable RF Systems

Cited by 92 publications

References 58 publications

Dual‐band filtering power divider with capacitor‐loaded centrally coupled‐line resonators

Dual‐band filtering power divider with capacitor‐loaded centrally coupled‐line resonators

High-resolution, on-chip RF photonic signal processor using Brillouin gain shaping and RF interference

Single and Multiband Acoustic-Wave-Lumped- Element-Resonator (AWLR) Bandpass Filters With Reconfigurable Transfer Function

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