Arvind Kumar Pandey

Miniaturized UWB BPF with a Notch Band at 5.8 GHz Using Cascaded Structure of Highpass and Lowpass Filter

The objective of this paper is to reduce the size of UWB filter with a notch without any via or DGS to make fabrication easier. The proposed filter is designed by cascading high pass and low pass filter. High pass structure is created by a planar Interdigital structure and low pass is created by a Hairpin line, which make the overall size of the filter much miniaturized. The frequency response of the filter has pass band frequency between 3.1 and 10.6 GHz with wide stop band. There is a notch in pass band at 5.8 GHz with attenuation around 16 dB to avoid interference from the WLAN. The overall size of the filter is 3.36 × 4.132 mm2 which is much smaller than many previously reported structure of filters.

Design of Dual-Band BPF Using Interdigital Structure Loaded Resonators

This paper presents a second-order dual-band bandpass filter (BPF) with sharp selectivity, good insertion, and wide stop band. Two modified open loop resonators are coupled to achieve the dual pass band at frequencies 1 and 2 GHz. An Interdigital structure is loaded on the resonator to reduce size as well as to improve selectivity of the proposed filter. Stubs are used to remove harmonics in higher frequencies for wide stopband. The scattering parameter of filter shows insertion loss and return loss in both pass bands of the filter less than 0.4 dB and better than 10 dB, respectively. The geometry of filter is designed on Rogers_RO3010 with dielectric constant 10.2 and of thickness 1.27 mm. The performance of the proposed filter is found better and smaller in size than filters designed by simple open loop resonator. The geometry of proposed filter is planar that makes it fabrication-easy and cost-effective.

Synthesis and Design of Microwave Bandpass Filter Using Impedance Independent Coupling Matrix

In this paper, a coupling matrix based method is used to synthesize a bandpass filter. The designing method is independent of change in source and load impedances. The proposed filter is synthesized by frequency transformation from lowpass prototype to bandpass filter. The MATLAB code is developed for frequency transformation and coupling matrix is generated. The filter is designed on RT/Duroid substrate with relative dielectric constant of 10.8 and thickness of 1.27 mm. The filter is designed and simulated on HFSS and response is found in good agreement with the response found from mathematical model.

Dual Notched Band Compact UWB Band Pass Filter Using Resonator Loaded SIR for Wireless Applications

In this paper a compact and simple Ultra Wide Band (UWB) Band Pass Filter(BPF) with dual notch band is proposed. Structure of the proposed filter comprises a Stepped Impedance Resonator (SIR) loaded with Interdigital resonator. SIR is coupled with input and output ports using interdigital coupling to create UWB pass band range of the filter. Intedgital resonators are loaded on the SIR to create notch band to reject frequency in the pass band of the filter. Pass band of the filter covers 3.1 to 10.6 GHz with two notch bands at 5.2 and 7.8 GHz to avoid interfernce from the WiFi and satellite comunication. Filter is designed on Rogers RT/ Duriod 6010, with the dielectric substrate of dielectric constant er = 10.8 and thickness h = 1.27 mm. There is no via or defected ground structure is used in the filter which makes its fabrication easier and cost effective.

Single notch band UWB BPF using square ring resonator

UWB BPF is demonstrated in the paper with single notch band for satellite communication having small size and less complex since no via or defected ground structure is used. The filter consist of square ring resonator between two interdigital structures with rectangular ring at both ports. The passband extends from 2.7 GHz to 10.6 GHz having insertion loss below 2 dB where as notch band has 10 dB rejection fractional bandwidth of 11.2% with attenuation of 19 dB centered at 8 GHz. The proposed filter is simulated in Agilent ADS.

A compact tri-band BPF using meandered ring resonator

This paper introduces a new compact band pass filter having three pass bands. The design of the filter consists of a meandered ring resonator with two stubs. The meandered structure reduces the dimensions of the filter considerably. The frequency response of the filter can be tuned by varying the geometric parameters. The theoretical analysis of the filter is done by using even/odd mode analysis. The three pass bands of the filter are centered at 2.37, 3.25 and 5.85 GHz. The insertion loss obtained by simulation of the filter is substantially small. The return loss is greater than 20 dB for all bands. The frequency characteristic and other performance parameters are compared with various filters validating the good performance of the filter.

Miniaturized dual-band BPF using hairpin loaded interdigital structure

This paper demonstrates a new structure of dual band microstrip bandpass filter (BPF) by cascading an interdigital structure (IDS) and a hairpin line structure. The use of IDS improves the quality factor of the proposed filter. The size of the filter is very small and it is very compact and simple to design. To reduce size of the proposed filter there is no use of via or defected ground structure which makes its fabrication easier and cost effective. The first band of filter covers 2.4GHz, 2.5GHz and 3.5GHz and second band covers 5.8GHz of WLAN/WiMAX standards with good insertion loss. The proposed filter is designed on FR4 with dielectric constant of 4.4 and of thickness 1.6mm. Performance of proposed filter is compared with previously reported filters and found better with reduced size.

Switchable filter between high pass and low pass responses

This paper proposes a simple and novel switchable microwave filter. The proposed filter can easily be switched between high pass and low pass responses. The filter uses a structure which can be easily switched. The high pass filter uses an interdigital structure and the low pass filter uses the hairpins that are mounted on the interdigital structure. The filter is reconfigurable and small in size. The structure is designed on F R4 substrate.

Design of ultra-wideband filter with reconfigurable notches

In this paper an ultra wideband bandpass filter with reconfigurable notches has been presented. It consists of a reconfigurable E to C shaped resonator centrally loaded on a multiple mode resonator (MMR). The MMR is constructed using stepped impedance resonator. Two notch frequencies are created by using reconfigurable E to C shaped resonator in order to reject these two interfering frequencies. Reconfigurability has been achieved by using a switch in the structure. The structure has been analysed for the two states of the switch reconfiguring E to C shape for ON and OFF states. By tuning the length of this reconfigurable E to C shaped resonator, the center frequencies of these notches can be changed.

A compact dualband bandpass-to-bandstop tunable filter for wireless applications

A compact dualband bandpass-to-bandstop tunable filter based on short stub loaded stepped impedance resonators is designed. It uses pin diode for bandpass-to-bandstop filter transformation and varactor diodes for tuning of the center frequency. The filter is designed on Taconic RF-35 substrate to obtain two close dualbands with tuning of center frequencies in the range 1.66–1.88GHz and 1.98–2.29GHz in bandpass mode and dualstops in the range 1.57–1.65GHz and 1.75–1.90GHz in bandstop mode.