Frequency-Selective Limiters Using Nonlinear Bandstop Filters

Phudpong, P.; Hunter, I.C.

doi:10.1109/tmtt.2008.2009078

Cited by 23 publications

(6 citation statements)

References 17 publications

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“…Diode-based FSLs have been implemented in parametric [11], [12] and resonant circuits [2], [13]- [17]. This is a lowcost technology resulting in small-form-factor devices at 2 GHz [12]- [15], [17], and 20 GHz [16]. Attenuation level up to 35 dB has been reported.…”

Section: Introductionmentioning

confidence: 99%

Frequency-Selective Limiters Using Triple-Mode Filters

Yang¹,

Khater

Naglich

et al. 2020

IEEE Access

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This paper presents the first frequency-selective limiter (FSL) with both power-activation and user-prompted override that also features a reconfigurable threshold power and frequency tuning with closed-loop feedback. The FSL is based on a tunable absorptive bandstop-to-all-pass filter topology with integrated electronics. Three distinct modes are available: user-defined bandstop, power-activated bandstop, and all-pass mode. In the user-defined bandstop mode, the FSL presents a measured notch of 45−55 dB at an user-defined center frequency within 1.5−2 GHz tuning range. The out-of-band insertion loss is less 0.8 dB. In the power-activated mode, the FSL switches intrinsically between its bandstop and all-pass responses based on the incident power level at any user-defined power threshold and frequency within the 1.5−2 GHz range. In the all-pass mode, the measured loss is less than 3.1 dB at the user-defined center frequency and less 0.8 dB elsewhere. The measurements are conducted including the two SMA connectors and the associated connector-to-microstrip transitions. The threshold power level is tunable in the −45 to +8 dBm range. The filter is designed and fabricated with high-quality substrate-integrated cavities with an extracted resonator unloaded quality factor (Qu) of 300. The unique features and the measured RF performance of the presented FSL are state-of-the-art results. INDEX TERMS Frequency-selective limiter, FSL, power-activated filter, tunable filter, absorptive bandstop-to-all-pass filter, evanescent-mode cavity filter.

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Section: Introductionmentioning

confidence: 99%

Frequency-Selective Limiters Using Triple-Mode Filters

Yang¹,

Khater

Naglich

et al. 2020

IEEE Access

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“…Limiter functionality has been incorporated into bandstop filters [5] to provide power-dependent notches. However, the limiter in [5] caused significant attenuation in bands adjacent to the bandstop center frequency when high-power signals were present.…”

Section: Introductionmentioning

confidence: 99%

“…However, the limiter in [5] caused significant attenuation in bands adjacent to the bandstop center frequency when high-power signals were present. This paper presents an alternative banstopfilter-based limiter concept that has low insertion loss under low-power excitation and a designable, narrow attenuation band when experiencing high-power signals in the designed band, as shown conceptually in Fig.…”

Section: Introductionmentioning

confidence: 99%

Power-dependent bandstop filters for frequency-selective limiting

Naglich

Guyette

2016

2016 IEEE MTT-S International Microwave Symposium (IMS)

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Abstract-The use of a power-dependent coupling structure that allows a cul-de-sac bandstop filter topology to continuously transform between a resonant all-pass response and a bandstop filter response with increasing input power is shown. In contrast to limiter devices that provide a wideband short circuit or ferrite resonance under high-power excitation, the concept presented in this paper provides the ability to design limiters with frequencyselectivity and without magnetic materials. For verification, a third-order power-dependent bandstop filter was designed and fabricated. It has a center frequency of 2.15 GHz, 3 dB bandwidth of 400 MHz, 1 dB limiting threshold of approximately 25 dBm, a response time of 10 ns, and provides over 16 dB of limiting.

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“…The reflection-type networks are widely used to design microwave circuits [3], [4], [15], [16], [29]- [31]. Therefore, this paper presents distributed transmission-line reflective-type configuration NGD networks topologies with a predefined NGD time and very low SA.…”

Section: Introductionmentioning

confidence: 99%

Low Signal-Attenuation Negative Group-Delay Network Topologies Using Coupled Lines

Chaudhary

Jeong

2014

IEEE Trans. Microwave Theory Techn.

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This paper presents the design and analysis of novel topologies of reflective-type negative-group-delay (NGD) networks with very small signal attenuation (SA). The proposed topologies are based on short-circuited coupled lines. Theoretical analysis shows that predefined group-delay (GD) time with very small SA can be obtained due to the high characteristic impedance of a coupled line and the small coupling coefficient. Due to the very low SA characteristics of the proposed networks, the burden of compensating general-purpose gain amplifiers can be reduced and provide stable operations while integrated to RF systems. This paper also analyses performance degradation of the GD time and SA of the proposed NGD networks according to the temperature-dependent resistance variation. For an experimental validation of the proposed topologies, distributed microstrip line NGD networks (type-I and type-II) are designed, simulated, and measured for a wideband code division multiple access (WCDMA) downlink frequency operating at a center frequency of 2.14 GHz. These results show a GD time of 7.27 ns with an SA of 7.43 dB for the type-I NGD network, and 6.3 and 9.23 dB for the type II-NGD network at the center frequency, and agree closely with the simulations. To enhance the NGD bandwidth, two NGD networks with slightly different center frequencies are connected in parallel, which provides wider bandwidth than the single stage case and shows practical applicability.Index Terms-Coupled lines, distributed transmission line, high characteristic impedance, low signal attenuation (SA), wideband code division multiple access (WCDMA).

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Frequency-Selective Limiters Using Nonlinear Bandstop Filters

Cited by 23 publications

References 17 publications

Frequency-Selective Limiters Using Triple-Mode Filters

Frequency-Selective Limiters Using Triple-Mode Filters

Power-dependent bandstop filters for frequency-selective limiting

Low Signal-Attenuation Negative Group-Delay Network Topologies Using Coupled Lines

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