Miniaturization of waveguide antenna using square/circular arrays of SRR

Samad, Muhammad Abdul; Hamid, A-K.

doi:10.1109/icedsa.2016.7818474

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…Waveguide was designed with two different aperture dimensions of the two monopole antennas. It is known that the aperture dimension with width × height (a × b) defined the cutoff frequency (f c ) [10]. The larger a and b attained a higher f c .…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Defected Waveguide Structure Toward Wideband Monopole Antennas

Chin¹,

Aziz²,

Ahmad³

et al. 2018

PIER M

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This paper presented the effects of Defected Waveguide Structure (DWS) toward wideband monopole antennas. Ultra-wideband (UWB) technology was introduced to support high data rate and maximum bandwidth utilization. Monopole antenna received great attention owing to its appealing features of planar in the structure and is easy to manufacture in miniaturized sizes. Yet, poor gain and directivity are always the drawbacks of the miniaturized antennas. It was found that there was no research work done on the monopole antenna design with DWS. Two wideband monopole antennas with a microstrip feed line and coplanar waveguide (CPW) feed line were proposed. Two waveguides with full copper and square DWS were designed at all the inner walls. Monopole antennas were then integrated in the waveguides. The antenna parameters studied were return loss, efficiency, gain, directivity and radiation pattern to investigate the effects of DWS toward monopole antennas. Both monopole antennas achieved wide bandwidth from 2.5 GHz to 11 GHz and higher efficiency of more than −2 dB. Monopole antennas with waveguide presented a narrower bandwidth from 6 GHz to 11 GHz but a significant directivity improvement of 5 dBi at a lower frequency of 4.5 GHz. Monopole antenna with square DWS demonstrated high directivity and gain in a wide bandwidth of 8.5 GHz. Higher gain was improved around 4 dB at the frequency of 4.5 GHz, and high efficiency of more than −2 dB was achieved. The DWS design served as a guide for future communication system based on the smart technology system.

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Section: Methodsmentioning

confidence: 99%

“…Meanwhile, research works on the waveguide have been covered extensively over the years, and a keen interest in its applications such as filter and antenna [10][11][12][13] is evolving. In [11], the rectangular waveguide antenna with dual-polarizations worked at 9 GHz frequency for a weather radar application.…”

Section: Introductionmentioning

confidence: 99%

Effects of Defected Waveguide Structure Toward Wideband Monopole Antennas

Chin¹,

Aziz²,

Ahmad³

et al. 2018

PIER M

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“…CST Microwave software is used to design and simulate waveguide. The waveguide dimension which is the width (a) and height (b) can be calculated from Equation (1) [4]. Cut off frequency (fc) is used to identify the waveguide dimension.…”

Section: Defected Waveguide Structure Designmentioning

confidence: 99%

“…Waveguide design with metamaterial also become popular topic for the researchers by using the loaded method [2][3][4][5]. For instance, metamaterial plates loaded with periodic arrays of complementary-split-ringresonators is put inside waveguide for high power microwave generation [5].…”

Section: Introductionmentioning

confidence: 99%

Basic structure of square and circle for defected waveguide structure

Chin

Aziz

2017

MATEC Web Conf.

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Abstract. Many existing waveguide designs focus on the application such as antenna and filter. Besides that, metamaterial used to design with waveguide is usually conducted by loading method. The configuration such as the walls or planes of waveguide is rarely proposed and designed. The motivation of this paper is to introduce the Defected Waveguide Structure (DWS) in waveguide to operate in Ultrawideband (UWB) frequency range. DWS is designed by using basic structure of square and circle. The square and circle are designed at all the walls of waveguide in patch. Hybrid design by mixing the square and circle is also proposed. The performance of DWS towards waveguide is analysed by using the transmission coefficient (S21) and reflection coefficient (S11). The filter circuit is constructed for modelling purpose to determine the value of inductance and capacitance. Copper waveguide acts as high pass filter at the frequency larger than cut off frequency 2.76GHz. The square DWS design works as band pass filter with narrowest bandwidth of 5.19GHz. The circle DWS design achieves the widest bandwidth of 6.55GHz for the pass band performance. Hybrid design improves the bandwidth slightly compare to square DWS design by 0.54GHz.

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“…Other impedance matching methods for a below-cutoff aperture include the use of a negative permeability material [39], an electromagnetic metamaterial [40][41][42][43], a radiator-filter combined structure [44][45][46][47]. Except for the radiator-filter combined structure, the input reflection coefficient is on the level of −10 dB, not −20 dB.…”

Section: Introductionmentioning

confidence: 99%

A New Technique for Broadband Matching of Open-Ended Rectangular Waveguide Radiator

Heo,

Xu,

Altanzaya

et al. 2023

Sensors

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The maximum reflection at an open end of a standard rectangular waveguide is about −10 dB in its operating frequency range. It is often used without matching. For critical applications, it is desirable to further reduce the reflection coefficient. In this paper, a new technique is presented for the broadband impedance matching of an open-ended rectangular waveguide. The proposed technique employs three thin capacitive matching elements placed at proper intervals via a low-loss dielectric material. The capacitance of, and distance between, the matching elements are optimized for broadband impedance matching using a simulation tool. Based on the proposed technique, two design examples are presented for the matching of a WR75 waveguide radiator. A reflection coefficient of less than −16 dB and −20 dB has been achieved over a ratio bandwidth of 2.13:1 and 1.62:1, respectively.

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Miniaturization of waveguide antenna using square/circular arrays of SRR

Cited by 5 publications

References 8 publications

Effects of Defected Waveguide Structure Toward Wideband Monopole Antennas

Effects of Defected Waveguide Structure Toward Wideband Monopole Antennas

Basic structure of square and circle for defected waveguide structure

A New Technique for Broadband Matching of Open-Ended Rectangular Waveguide Radiator

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