Low cost SIW Chebyshev bandpass filter with new input/output connection

2021 International Conference on Electrical, Communication, and Computer Engineering (ICECCE)

Ogbodo

Imasuen

2021

A new formulation for implementing T-junction matching networks used in diplexer design is proposed in this paper. The investigation exploits the electrical length of quarter-wavelength microstrip transmission lines, and the guided-wavelength of the lines at one giga-Hertz frequency, in achieving the T-junction design formulation. This novel design would eradicate the uncertainties associated with frequent tuning and optimisation of T-junctions to achieve the desired energy distribution in diplexer designs. A prototype diplexer for separating the transmit from the receive frequencies within the front end of a wireless cellular base station is investigated and used to demonstrate the new design method. The prototype microwave diplexer with Tx and Rx centre frequencies of 2680 MHz and 3000 MHz, respectively, have been designed, implemented using microstrip, simulated, and presented. The simulation results of the circuit model and that of the microstrip layout prototype diplexer, demonstrate decent agreement with a high isolation of better than 50 dB between the transmit (Tx) and the receive (Rx) channels. The in-band lowest insertion loss is located at 1.1 dB, with a better than 20 dB in-band return loss across both the Tx and Rx bands.

Section: Circuit Modelmentioning

confidence: 99%

Formulation for Energy Distribution in T-Junctions for Diplexer Design

2021 International Conference on Electrical, Communication, and Computer Engineering (ICECCE)

Ogbodo

Imasuen

2021

“…The proposed integrated FPD was formed using two separate but identical three-pole bandpass filters designed following the technique reported in [13], [14]. The design specification for the channel filters are as follows: centre frequency f0, 2.6 GHz; fractional bandwidth FBW, 3% and passband return loss of 20 dB.…”

Section: Circuit Model Designmentioning

confidence: 99%

Symmetric 3dB Filtering Power Divider with Equal Output Power Ratio for Communication Systems

2020 International Conference on Electrical, Communication, and Computer Engineering (ICECCE)

Otuka

Ebenuwa

et al. 2020

Self Cite

This paper presents a two-way filtering power divider (FPD) with an equal output power ratio of 1:1. This implies that each of the FPD output port would receive 50% of the power at the input port. To achieve miniaturisation, a common square open-loop resonator is used to distribute energy between the two integrated Chebyshev bandpass filters. In addition to distributing energy, the common resonator also contributes one pole to each integrated bandpass filter (BPF), hence, reducing the number of individual resonating elements used in achieving the integrated FPD. To demonstrate the proposed design technique, a prototype FPD centred at 2.6 GHz with a 3 dB fractional bandwidth of 3% is designed, simulated and presented. The circuit model and microstrip layout results of the FPD show good agreement. The microstrip layout simulation responses show that a less than 1.1dB insertion loss and a greater than 16.5dB in-band return loss were achieved. The overall footprint of the integrated FPD is 37mm by 13mm (i.e. 0.32λg x 0.11λg, for λg = guided-wavelength of the 50Ω microstrip line at 2.6 GHz). The integrated FPD reported in this paper shows some promising merits when compared to similar devices recently reported in literature.

“…Hence, care must be taken when selecting design specifications to meet the most critical design targets. Some popular manufacturing techniques that have been employed in fabricating filters include printed circuit board (PCB) [21], low temperature co-fired ceramic (LTCC) [22] and liquid crystal polymer (LCP) [23]. In terms of low cost and commercial availability, the PCB wins and hence, has been utilized in the fabrication of the BPF reported in this paper.…”

Section: Ijeeimentioning

confidence: 99%

“…The BPF circuit model was established from the standard normalized 3-pole Chebyshev lowpass prototype filter shown in Figure 2 [21], where g is the filter parameter. The proposed BPF is designed to have a center frequency, f 0 of 2.6 GHz, a fractional bandwidth of 3%, a passband ripple of 0.04321 dB, and a passband return loss of 20 dB.…”

Section: Filter Circuit Modelmentioning

confidence: 99%

Circuit Modelling of Bandpass/Channel Filter with Microstrip Implementation

2020

IJEEI

This paper presents a step-by-step approach to the design of bandpass/channel filters. A 3-pole Chebyshev bandpass filter (BPF) with centre frequency of 2.6 GHz, fractional bandwidth of 3%, passband ripple of 0.04321 dB and return loss of 20 dB has been designed, implemented, and simulated. The designed filter implementation is based on the Rogers RT/Duroid 6010LM substrate with a 10.7 dielectric constant and 1.27 mm thickness. The BPF was also fabricated using the same substrate material used for the design simulation. The circuit model and microstrip layout results of the BPF are presented and show good agreement. The microstrip layout simulation results show that a less than 1.8 dB minimum insertion loss and a greater than 25 dB in-band return loss were achieved. The overall device size of the BPF is 18.0 mm by 10.7 mm, which is equivalent to 0.16λg x 0.09λg, where λg is the guided wavelength of the 50 Ohm microstrip line at the filter centre frequency.