Evaluation of Doubled-sided Substrate Attachment Technique for Round Shaped Large Metallic Housing under Airborne System Development

Sarkar, Mahadev; Raghu, B. R.; Sudheesh, K. S.

doi:10.1109/iccca49541.2020.9250792

Cited by 8 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It triggers amplitude modulation (AM) to phase modulation (PM) conversion in the output signal. There are several other reasons for phase nonlinearity in the final signal like improper line ratios and inappropriate unwrapped phase values at the end of the successive delay lines of various phase correlators [15]. Hence, phase nonlinearity estimation is essential not only for analog circuitry correction but also for digital processing (unwrapped phase data Ѳ inf ).…”

Section: Phase Nonlinearity Estimationmentioning

confidence: 99%

Phase nonlinearity reduction of a complex receiver having multiple phase correlators

Sarkar

Raghu

Sivakumar

2023

Int. J. Microw. Wireless Technol.

View full text Add to dashboard Cite

This article analyzes and describes phase nonlinearity reduction techniques in detail for ultra wideband complex receivers to qualify airborne system requirements. Phase nonlinearity directly affects the final frequency resolution coming from unknown threats. Thereby, the reduction of phase nonlinearity of all radio frequency (RF) channels including phase correlators is very essential. A simple phase nonlinearity calculation step has been shown in this article without taking the help of any coding (software). A detail excel sheet–based phase nonlinearity calculation has been explained and estimated with examples. Power and phase corrections are especially done to keep the RF response flat over a wide frequency spectrum to enhance better phase linearity. This is done by designing various equalizers with different slope gradients and adjusting power levels by using attenuation pads or reducing feeds by other means. Phase nonlinearity has been kept under control by tracking the phase of mixers, other passive/active components within ±5°, and all the RF channels within ±15°. The power level has been adjusted within P1dB or just beyond the P1dB to keep the harmonic level less, which in turn controls phase nonlinearity in all the active devices. The performance of phase correlators against various power levels has been analyzed to finalize uniform RF and LO power levels (feed) at the input of the phase correlators. The level of uniform feed has been decided after reviewing phase nonlinearity responses of the correlators. Thus, the final resolved frequency become accurate (<3 MHz root mean square). Finally, four receivers have successfully been developed and evaluated over temperature (−40°C to +71°C) and vibration to establish the method for mass production.

show abstract

Section: Phase Nonlinearity Estimationmentioning

confidence: 99%

Phase nonlinearity reduction of a complex receiver having multiple phase correlators

Sarkar

Raghu

Sivakumar

2023

Int. J. Microw. Wireless Technol.

View full text Add to dashboard Cite

show abstract

“…Carrier plate are made to ensure robust ground effects at higher frequencies and very good mechanical support to the PCBs. 0.4 mm kover and copper-molly sheets having nicely nickel plated with minimum impurities have been used to make carrier plates [19].…”

Section: Active Spdt Switch Designmentioning

confidence: 99%

Wideband Active Switch for Electronic Warfare System Applications

Sarkar¹,

Anand²,

Sivakumar³

2020

Adv. sci. technol. eng. syst. j.

Self Cite

View full text Add to dashboard Cite

Discrete component based ultra-wideband SPDT switch modelling, design and implementation challenges are reported in this article. The basic SPDT switch is planned to design using PIN diodes (bare die). Nonlinear parameters extraction steps of PIN diode from datasheets have been proposed in this article instead of using readymade nonlinear PIN diode models. Equalizers are designed as per requirement using discrete components and quarter wave transmission lines for different source and load impedances. Then all the designed components are integrated with a low noise amplifier (LNA). Extraction of PIN diodes' nonlinear parameters are carried out using diode equations along with datasheet parameters. Layout has been implemented using microstrip and CPWG techniques. Quickly responding driver is designed using transistors and logic gates. CPWG based layout achieves better isolation compared to microstrip line-based layout at highest frequencies. Measured and simulated responses are tallied and they are matching together respectively except few exceptions. Measured responses also validates the well agreement between the proposed nonlinear diode modelling and equalizer design with different input and output impedances.

show abstract

“…Hence, EMI/EMC (Electro-Magnetic Interference/ Electro Magnetic Compatibility) tests become a challenging task for such airborne application systems [3][4]. Extensive works have been published over the mitigation of EMI/EMC issues starting from circuit level design to system level implementations [5][6][7][8][9][10][11][12][13][14][15][16]. A topological network based model is proposed to carry out system level EMC analysis in [4].…”

Section: Introductionmentioning

confidence: 99%

Design Strategies to Overcome EMI/EMC Issues of Airborne Receivers

Sarkar

Raghu

2022

J. Phys.: Conf. Ser.

Self Cite

View full text Add to dashboard Cite

This article describes various housing design strategies of a complex receiver system to overcome EMI/EMC challenges for airborne system applications. Isolation of leakage energy between various RF/DC-DC converters/Regulators/pulsing blocks are the key target of this design to keep conductive and radiative emission minimum. Hence, complex receiver design has been segregated into various modules. Block level design is carried out using 3D EM simulator to assess the leakage. Then they are stacked together very tactfully within the specified area without compromising inter-channel/module interference between them and the form factor respectively. The super compact stacks are further channelized for RF, DC supply, controls etc. and protected them from any kind of interferences. Low cost flexi interconnects are made to interface various stacks to arrest unwanted high/low frequency leakages. Finally, receiver module is developed and tested over temperature and EMI/EMC successfully to establish the methodology.

show abstract

Evaluation of Doubled-sided Substrate Attachment Technique for Round Shaped Large Metallic Housing under Airborne System Development

Cited by 8 publications

References 8 publications

Phase nonlinearity reduction of a complex receiver having multiple phase correlators

Phase nonlinearity reduction of a complex receiver having multiple phase correlators

Wideband Active Switch for Electronic Warfare System Applications

Design Strategies to Overcome EMI/EMC Issues of Airborne Receivers

Contact Info

Product

Resources

About