A Varactor-Based Tunable Combline Bandpass Filter Using Suspended Integrated Stripline (SISL)

Kenney, Russell H.; Walker, Christopher J.; Sigmarsson, Hjalti H.; McDaniel, Jay W.

doi:10.1109/jmass.2020.3029581

Cited by 18 publications

(6 citation statements)

References 15 publications

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“…However, this is achieved through the use of a complex system comprising 12 tuning elements and six bias controls, and it is characterized by a relatively high insertion loss. In contrast, the frequency-tunable filters mentioned in [5,7,12,13,16] require a minimum configuration of four tuning elements and two bias controls to facilitate frequency adjustment. This comparison highlights the more complex tuning mechanisms employed by these filters.…”

Section: Comparisonmentioning

confidence: 99%

“…To mitigate this challenge, the industry has introduced the concept of tunable systems, which feature adjustable hardware parameters. Tunable designs, such as filters [5][6][7][8][9][10][11][12][13][14][15][16][17][18], couplers [19][20][21], and antennas [22], represent a significant advancement in this field. By incorporating tunability into these components, there is a substantial reduction in the number of passive elements required.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is imperative to develop new methodologies as alternatives to overcome these challenges. This approach was further refined by integrating components such as varactor diodes or MEMS capacitors into the filter's structure [8][9][10][11][12]. Such integration allows for the electronic adjustment of capacitance, thereby altering the resonant frequencies of the filters.…”

Section: Introductionmentioning

confidence: 99%

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A Compact Bandpass Filter with Widely Tunable Frequency and Simple Bias Control

Xiang,

Tan,

Ding

et al. 2024

Electronics

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This research paper introduces an innovative design for a compact bandpass filter, notable for achieving a substantial tuning range of operational frequencies using just a single bias voltage. The design is based on a planar microstrip approach, distinguished by its straightforward and efficient structure. Additionally, this filter is characterized by its excellent performance in suppressing out-of-band frequencies. To validate the practicality and effectiveness of this novel design, a compact filter was designed, manufactured, and measured. The testing results were impressive, showing that the filter’s measured center frequency could be tuned across a wide spectrum, from 1.1 to 3.1 GHz, achieving a relative bandwidth of up to 95%. Herein, the relative bandwidth is derived from the calculation of 2(fhigh − flow)/(fhigh + flow). Remarkably, the filter consistently maintains a return loss exceeding 19 dB throughout its tuning range. Additionally, it sustains a 15 dB return loss bandwidth greater than 90 MHz, with the insertion loss varying between a minimum of 0.9 dB and a maximum of 2.1 dB. The compactness of the filter is one of its standout features, with circuit dimensions measuring a mere 0.06λg × 0.09λg (physical dimensions is 13.8 mm × 21.3 mm), where λg represents the wavelength at the filter’s lowest center frequency.

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Section: Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Compact Bandpass Filter with Widely Tunable Frequency and Simple Bias Control

Xiang,

Tan,

Ding

et al. 2024

Electronics

View full text Add to dashboard Cite

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“…Tunable filters are considered one of the required filters due to their unique role of adaptation to the requirements of various wireless systems. To miniaturize the filter size and tune its achieved behavior, varactor diodes are used [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Bandpass/bandstop switching with tunable pass band operation based on split ring and open loop resonators

2022

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In this work, a bandpass filter (BPF) using a split ring and open-loop resonators for wireless applications is discussed. The split-ring resonator (SRR) is the main part of the band stop filter (BSF) as a preliminary design for obtaining a band stop behavior. The proposed filter is printed on a RO4003 substrate with a 3.55 dielectric constant and a total size of 30 × 30 × 0.813 mm3. First, the SRR BSF is presented to operate at a center frequency of 5 GHz then an open loop resonator is added between input/output ports to achieve an extra band stop region to generate a bandpass behaviour between the two stopbands at 3.5 GHz. The PIN diodes are used to switch between the bandstop and bandpass operation. Then, two varactor diodes are embedded in the open-loop resonator to control the bandpass and bandstop regions of the suggested filter. The experimental results validate the simulated ones confirming the suitability of the suggested filter for proper operations in different wireless applications.

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“…The capacitance of the varactor diode can be adjusted by varying the reverse bias voltage, enabling frequency agility in microwave filters. In [51][52][53][54], varactor diodes are employed in different filter topologies to vary the effective phase of the filter's resonators. The main advantage of this technology is its capability to achieve continuous reconfigurability.…”

Section: Reconfiguration Techniquesmentioning

confidence: 99%

Development of non-conventional microwave devices based on substrate-integrated technology for advanced applications

Nova Giménez

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Introduction 1.1 Motivation and Interest of the TopicThere has been a rapid transformation in communication systems in recent years, with a particular impact on satellite communications. The high demand for data throughput, bandwidth and ubiquitous connectivity is pushing microwave technology to its limits. This change is particularly evident in the space industry, where the business focus has shifted from large Geostationary Earth Orbit (GEO) satellites to constellations of numerous satellites operating in Low Earth Orbit (LEO). The concept of large LEO constellations is reminiscent of the ambitious global phone connectivity projects of the 1990s that include Iridium, Globalstar, and Odyssey. Most of these systems were ultimately cancelled due to their high costs or technological limitations, which led the new LEO systems to focus on reducing the cost per bit.In this evolving scenario, the feasibility of these new satellite systems heavily relies on the reduction of production, launching, and operation costs. Microwave devices used in these space communications systems must not only exhibit high performance and adaptability but also undergo a drastic reduction in weight, size, and price. These factors are crucial for the success and sustainability of the new generation of space communication systems, as highlighted by studies on large LEO constellations and industry reports [1,2].Different solutions can be applied to improve the performance and reduce the production cost and weight of the Radio Frequency (RF) front-ends. One notable solution is the Substrate Integrated Circuit (SIC) technology, which emerged in the late 1990s to address similar demands of the industry [3,4]. The SIC technology involves the integration of different waveguide topologies within a substrate stack-up, combining the benefits of planar transmission lines (e.g., microstrip, coplanar, and stripline) and non-planar technologies (e.g.,• Geostationary Earth Orbit (GEO) satellites orbit the Earth at an altitude of approximately 36 000 km [11]. At this altitude, satellites travel at the same rate as the Earth's rotation, making them appear stationary in the sky. This characteristic eliminates the need for complex tracking systems in the ground segment and enables near-continental coverage. A single GEO satellite can provide coverage from around 20 degrees north to 20 degrees south latitude [9]. Moreover, due to its high altitude, only three equally spaced GEO satellites are required to achieve quasi-global coverage. These characteristics make the GEO systems particularly suitable for broadcasting communications Substrate integrated technologiesThe integration of planar and non-planar circuits is a critical aspect of microwave and millimetre wave front-ends. Planar transmission lines (i.e., microstrip, coplanar waveguide, Empty Substrate Integrated Coaxial Line (ESICL) and Ridge Empty Substrate Integrated Waveguide (RESIW) that integrate coaxial lines and ridge waveguides in planar substrates.The significant interest in this technology has als...

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A Varactor-Based Tunable Combline Bandpass Filter Using Suspended Integrated Stripline (SISL)

Cited by 18 publications

References 15 publications

A Compact Bandpass Filter with Widely Tunable Frequency and Simple Bias Control

A Compact Bandpass Filter with Widely Tunable Frequency and Simple Bias Control

Bandpass/bandstop switching with tunable pass band operation based on split ring and open loop resonators

Development of non-conventional microwave devices based on substrate-integrated technology for advanced applications

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