Design of reconfigurable integrated substrate integrated waveguide (SIW) filter and antenna using multilayer approach

Filtering antennas or filtennas realize both antennas and filter functions in a single structure with the sole purpose of reducing losses and size in the design of a radio system. This article presents a comprehensive view of various filtennas design techniques and their types, satisfying the requirements of different wireless communication standards. The codesign and synthesis approaches and multilayer structure, slot/slit, and parasitic elements are the frequently used techniques reported in the literature to date for the filtennas design. The codesign and synthesis approaches need an extra filter in the filtenna's design, thus making it more complex. Whereas multilayer, slot, and parasitic elements do not require additional filters, and help the radio design become compact in size. The individual elements, that is, filter and antenna used in the filtenna are designed by cutting slots, stacking, resonators, or metamaterial structures.There are two broad categories of filtennas, namely, planar and nonplanar. Most of the papers covered in this article are planar, whereas, under the non-

Section: Siw Filtering Antennamentioning

confidence: 99%

Filtering antennas: A technical review

Gangwar¹,

Alam

Rajpoot³

et al. 2021

“…The demand for wireless services have seen exemplary growth, whether it is Wireless Local Area Network (WLAN), Worldwide Interoperatability for Microwave Access (WiMax), Global Positioning System (GPS) or portable devices such as mobile phone, Bluetooth, medical equipments, etc. Antenna and filters being inherent passive components in RF front‐end system of wireless communication, there is exponential surge in research targeting to achieve the desired features like light weight, compact, low cost robust front‐end system with good filtering and radiating properties 1‐18 . The performance of front‐end system deeply affects the efficiency and quality of wireless communication system.…”

Section: Introductionmentioning

confidence: 99%

“…Conventionally, the reported filtennas follows two design approaches, like fusion method 1‐4 and filter synthesis method 5‐13 , 16,18 . Filtennas based on fusion approach, focused on antenna design.…”

Section: Introductionmentioning

confidence: 99%

Synthesis approach to design a compact printed monopole filtenna for 2.4 GHz Wi‐Fi application

Pal

Sinha

Mahto³

2021

This communication presents a compact low cost filtenna (35 mm × 30 mm) operating in 2.31 to 2.49 GHz spectrum for possible applications pertaining to 2.4 GHz Wi‐Fi standards 802.11b, 802.11g, and 802.11n. Initially, two microstrip square open loop resonators are designed to serve as band‐pass filters with resonant frequency of 2.4 GHz. Adapting the synthesis approach, the second resonator is replaced by inverted L‐shaped monopole antenna designed at 2.4 GHz. The antenna is integrated to filter through coupled line admittance inverter to form a compact module with near zero insertion loss within the proposed operating frequency band, filtenna possess uniform omnidirectional radiation pattern in H‐plane and monopole pattern in E‐plane, steep skirt at both edges, 7.5% fractional bandwidth, good return loss and low cross polarization characteristics. The simulated design is validated by measurements of parameters of prototype fabricated on FR4 substrate, slight acceptable discrepancy is experienced which can be attributed to fabrication tolerances and variation in material characteristics.

“…In recent decades, substrate‐integrated‐waveguide (SIW) technology has been widely applied to antenna and filter designs due to its advantages of high quality factor, low fabrication cost, and convenient planar integration 1‐3 . Especially, quarter‐mode (QM) SIW cavities have attracted significant research interests, compared with full‐mode (FM) cavities 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Dual‐functional QM SIW cavity integrating two‐element MIMO antenna and second‐order bandpass filter

Niu¹,

Cao²

2020

A quarter‐mode (QM) substrate‐integrated‐waveguide (SIW) cavity is designed as a dual‐functional component. By etching three slots, four sub‐cavities are formed and then two of them with the same size are individually fed by a coaxial port. Three resonating frequencies are excited in the single QM SIW cavity. One of them can radiate cavity energy input by these ports into free space, implying a two‐element multiple‐input‐multiple‐output (MIMO) antenna, whereas the other two can transmit energy from one port to the other port, indicating a second‐order bandpass filter. Moreover, antenna isolation and filter bandwidth can be adjusted to a certain degree. A prototype with the overall size of 0.40λ0 × 0.40λ0 × 0.02λ0 has been fabricated. The integrated bandpass filter demonstrates the measured center frequency of 3.8 GHz and operating bandwidth of 32 MHz while the integrated MIMO antenna exhibits the frequency of 3.4 GHz, bandwidth of 67 MHz, port isolation of 18.0 dB, radiation gain of 4.0 dBi, and envelope correlation coefficient of 0.25.