Quasi-elliptic dual-band bandpass filters based on series-cascaded multi-resonant cells

2020 ◽  
Vol 12 (7) ◽  
pp. 609-614
Author(s):  
Andrea Ashley ◽  
Dakotah J. Simpson ◽  
Dimitra Psychogiou
Keyword(s):  
Radio Frequency ◽  
Insertion Loss ◽  
Transfer Functions ◽  
Bandpass Filters ◽  
Dual Band ◽  
Proof Of Concept ◽  
Lumped Element ◽  
Transmission Zeros ◽  
Design Competition ◽  
Implementation Scheme

AbstractThis paper reports on quasi-elliptic dual-band bandpass filters (BPFs) that were designed for the Filter Student Design Competition of the 2019 European Microwave Week. The proposed lumped-element (LE) BPF concept is based on two dual-band transversal cells and one multi-resonant cell that allow the realization of symmetric and asymmetric dual-band transfer functions shaped by six poles and five transmission zeros. A compact implementation scheme based on LE series resonators is proposed for size compactness and wide spurious free out-of-band response. For proof-of-concept demonstration purposes, a dual-band LE prototype with two passbands centered 1 and 1.5 GHz was designed, manufactured, and measured. It exhibited the following radio frequency measured performance characteristics. Passbands centered at 1.02 and 1.45 GHz, minimum insertion loss levels of 2.0 and 2.7 dB, and bandwidth of 146 and 105 MHz, respectively, for the first and the second passband, and out-of-band rejection >30 dB between 0 and 894 MHz, 1.17–1.34 GHz, and 1.72–6.9 GHz.

scholarly journals Design of a Microwave Lowpass – Bandpass Filter using Deep Learning and Artificial Intelligence

2021 ◽  
Vol 3 (1) ◽  
pp. 1-16
Author(s):  
Saeed Roshani ◽  
◽  
Hossein Heshmati ◽  
Sobhan Roshani ◽  
◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Deep Learning ◽  
Insertion Loss ◽  
Dual Band ◽  
Transmission Zeros ◽  
Compact Size ◽  
Electrical Devices ◽  
Low Pass ◽  
Artificial Neural Network Ann ◽  
Better Than

In this paper, a lowpass – bandpass dual band microwave filter is designed by using deep learning and artificial intelligence. The designed filter has compact size and desirable pass bands. In the proposed filter, the resonators with Z-shaped and T-shaped lines are used to design the low pass channel, while coupling lines, stepped impedance resonators and open ended stubs are utilized to design the bandpass channel. Artificial neural network (ANN) and deep learning (DL) technique has been utilized to extract the proposed filter transfer function, so the values of the transmission zeros can be located in the desired frequency. This technique can also be used for the other electrical devices. The lowpass channel cut off frequency is 1 GHz, with better than 0.2 dB insertion loss. Also, the bandpass channel main frequency is designed at 2.4 GHz with 0.5 dB insertion loss in the passband.

Miniaturized Dual-Band Bandpass Filter Using Embedded Dual-Mode Resonator with Controllable Bandwidths

Frequenz ◽  
2016 ◽  
Vol 70 (9-10) ◽  
Author(s):  
Chuanming Zhu ◽  
Jin Xu ◽  
Wei Kang ◽  
Zhenxin Hu ◽  
Wen Wu
Keyword(s):  
Insertion Loss ◽  
Degrees Of Freedom ◽  
Bandpass Filter ◽  
The Other ◽  
Dual Band ◽  
Dual Mode ◽  
Transmission Zeros ◽  
Low Insertion Loss ◽  
Multiple Transmission ◽  
Mode Resonator

AbstractIn this paper, a miniaturized dual-band bandpass filter (DB-BPF) using embedded dual-mode resonator (DMR) with controllable bandwidths is proposed. Two passbands are generated by two sets of resonators operating at two different frequencies. One set of resonators is utilized not only as the resonant elements that yield the lower passband, but also as the feeding structures with source-load coupling to excite the other to produce the upper passband. Sufficient degrees of freedom are achieved to control the center frequencies and bandwidths of two passbands. Moreover, multiple transmission zeros (TZs) are created to improve the passband selectivity of the filter. The design of the filter has been demonstrated by the measurement. The filter features not only miniaturized circuit sizes, low insertion loss, independently controllable central frequencies, but also controllable bandwidths and TZs.

scholarly journals High Selectivity Dual-Band Bandpass Filter with Tunable Lower Passband

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Wei-Qiang Pan ◽  
Xiao-Lan Zhao ◽  
Yao Zhang ◽  
Jin-Xu Xu
Keyword(s):  
High Selectivity ◽  
Bandpass Filter ◽  
Bandpass Filters ◽  
Dual Band ◽  
Transmission Zeros ◽  
Resonant Modes ◽  
Novel Method ◽  
Good Agreement ◽  
Tunable Bandpass Filter

This paper presents a novel method to design dual-band bandpass filters with tunable lower passband and fixed upper passband. It utilizes a trimode resonator with three controllable resonant modes. Discriminating coupling is used to suppress the unwanted mode to avoid the interference. Varactors are utilized to realize tunable responses. The bandwidth of the two bands can be controlled individually. Transmission zeros are generated near the passband edges, resulting in high selectivity. For demonstration, a tunable bandpass filter is implemented. Good agreement between the prediction and measurement validates the proposed method.

Quasi-elliptic evanescent-mode filters using non-resonating mode waveguide cavities

2015 ◽  
Vol 7 (3-4) ◽  
pp. 211-218 ◽  
Author(s):  
Simone Bastioli ◽  
Richard V. Snyder
Keyword(s):  
Insertion Loss ◽  
Bandpass Filters ◽  
Experimental Results ◽  
The Other ◽  
Q Factor ◽  
Evanescent Mode ◽  
High Q ◽  
Transmission Zeros ◽  
Waveguide Cavities ◽  
A New Technique

A new technique to realize quasi-elliptic bandpass filters with extreme close-in rejection is presented in this paper. The basic idea consists of embedding non-resonating mode waveguide cavities within the structure of an evanescent-mode filter. Such a combination of cavities and resonators allows the generation of very close transmission zeros while realizing at the same time relatively wide passbands and stopbands. Both H-plane TE201 mode and E-plane TM110 mode configurations are used as non-resonating mode waveguide cavities. In contrast with the other elliptic evanescent-mode filters using conventional approaches, the insertion loss degradation at the filter cut-off frequencies is minimized thanks to the high-Q factor of the waveguide cavities, whose corresponding poles are located right at the edges of the passband. The experimental results of an evanescent-mode filter having 9.950–11.000 GHz passband and providing more than 45 dB rejection between 11.040 and 11.050 GHz validate the proposed solution.

Dual-band bandpass filter for software defined radio and 5G

2020 ◽  
Vol 12 (7) ◽  
pp. 629-634
Author(s):  
Wei-Chung Chang ◽  
Wen-Hua Tu
Keyword(s):  
Insertion Loss ◽  
Software Defined Radio ◽  
Figure Of Merit ◽  
Bandpass Filter ◽  
Filter Design ◽  
Dual Band ◽  
Free Response ◽  
Design And Implementation ◽  
Design Competition ◽  
Loss Level

AbstractThis paper presents the filter design in the student design competition of EuMW 2019. This contest motivates students for the design and implementation of a dual-band bandpass filter able to get outstanding performance, where different implementation technologies, such as microstrip, coplanar, multilayer microstrip, substrate integrated waveguide, and some others can be effectively employed. Filters are evaluated by considering a figure of merit (FoM) defined by the insertion loss level, selectivity, spurious-free response, and size. To this end, three viable dual-band bandpass filters with different feeding technologies, resonators, and design topologies are investigated for the optimal FoM.

Compact dual‐mode dual‐band HMSIW bandpass filters using source–load coupling with multiple transmission zeros

2019 ◽  
Vol 55 (4) ◽  
pp. 210-222 ◽  
Author(s):  
Wangshuxing Ieu ◽  
Dongfang Zhou ◽  
Dewei Zhang ◽  
Dalong Lv
Keyword(s):  
Bandpass Filters ◽  
Dual Band ◽  
Dual Mode ◽  
Transmission Zeros ◽  
Multiple Transmission

Design of a miniature dual-band bandpass filter with interlocked stepped-impedance resonators for 5G new radio access technology

2020 ◽  
Vol 12 (8) ◽  
pp. 733-737
Author(s):  
Wei-Lun Hsu ◽  
Pei-Yu Lyu ◽  
Sheng-Fuh Chang
Keyword(s):  
Bandpass Filter ◽  
Dual Band ◽  
Access Technology ◽  
Transmission Zeros ◽  
Radio Access Technology ◽  
Fifth Generation ◽  
Radio Access ◽  
New Radio ◽  
Design Competition ◽  
Insertion Losses

AbstractA miniature dual-band bandpass filter with interlocked stepped-impedance resonators (SIRs) is presented in this paper, which was designed for the student design competition held in European Microwave Week 2019. This bandpass filter is required to have two concurrent passbands, namely, the first passband at 900–1000 MHz and the second passband at 1427–1518 MHz bands, which cover six designated bands in sub-6 GHz range of fifth generation (5G) New Radio Access Technology. Three stopbands are required at 500–850, 1050–1350, and 1600–2000 MHz, respectively. To achieve the best figure of merit, an interlocked configuration of two SIRs is proposed. One advantage is that the impedance ratio of the inter-locked SIR can be controlled to have two passbands at the required frequencies. Second, the coupling section of the interlocked SIR gives three transmission zeros distributed to every stopbands such that the stopband suppression are dramatically enhanced. The measured results show that the passband insertion losses are 2.16 dB at the first passband and 1.33 dB at the second passband, and the return losses are greater than 10 dB. The stopband suppression at the transmission zeros are greater than 38 dB. The circuit is very compact as 41.40 × 19.96 mm2, equivalent to $0.25 \times 0.12\,\lambda _g^2$.

Advanced lumped-element filters for digital microwave power amplifiers

2015 ◽  
Vol 7 (5) ◽  
pp. 589-596 ◽  
Author(s):  
Monica Martinez Mendoza ◽  
Andreas Wentzel ◽  
Alejandro Alvarez Melcon ◽  
Wolfgang Heinrich
Keyword(s):  
Insertion Loss ◽  
Power Amplifiers ◽  
Microwave Power ◽  
Input Impedance ◽  
Considerable Improvement ◽  
Impedance Characteristic ◽  
Lumped Element ◽  
Transmission Zeros ◽  
Microwave Power Amplifiers ◽  
Band Pass

In this paper, two compact lumped-element band pass reconstruction filters for digital microwave power amplifiers applications in the800 MHzband are presented. The filters, based on the trisection and quartet topologies, include cross-couplings which produce transmission zeros for maximum selectivity, and can be designed with practical element values. In contrast to common filter designs the input impedance characteristic is optimized broadband to values different from50 Ω, as required for proper amplifier operation. Both filters achieve an insertion loss of around0.8 dBand an equiripple bandwidth of240 MHz (trisection)and290 MHz (quartet), respectively, with improved out-of-band suppression. Results show that a considerable improvement in amplifier linearity and efficiency can be obtained with the new proposed filters, as compared with simpler filters traditionally used in power amplifier applications.

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