A design of novel grooved circular waveguide polarizers

Yoneda, Naofumi; Miyazaki, Ryoichi; Matsumura, Ikuo; Yamato, Masao

doi:10.1109/22.898996

Cited by 71 publications

(12 citation statements)

References 3 publications

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“…3): conical horn antenna, polarizer, and rectangular-circular waveguide converter. For the sake of compactness and ease of manufacture, we chose a grooved circular waveguide polarizer for this horn antenna [9]. …”

Section: A Design Of Horn Antennamentioning

confidence: 99%

Prototype of 32-element horn antenna array for imaging reflector antenna of 21-GHz band broadcasting satellite

Nagasaka¹,

Nakazawa²,

Kamei³

et al. 2014

2014 44th European Microwave Conference

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A 21-GHz band satellite broadcasting system is being studied as a means of delivering 8K (Super Hi-Vision), 3DTV, and other advanced forms of broadcasting. We assumed the use of two 300-MHz class wideband channels in the 21.4 to 22.0-GHz band and devised an array-fed imaging reflector antenna (array-fed IRA) to supply enough power for a transponder with such a wide band. The array-fed IRA is an effective means of exploiting limited resources because of its ability to control radiation patterns; the 21-GHz band suffers from severe fading due to rain. To confirm the feasibility of the array-fed IRA system, we designed an engineering model of an array-fed IRA for a 21-GHz band broadcasting satellite. The engineering model has a feed array that consists of 32 horn antennas. To improve the accuracy of the antenna's arrangement, we combined the 32 horn antennas into one unit. To evaluate the characteristics of this unit type feed array, we fabricated and tested a 32-element horn antenna array.

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Section: A Design Of Horn Antennamentioning

confidence: 99%

Prototype of 32-element horn antenna array for imaging reflector antenna of 21-GHz band broadcasting satellite

Nagasaka¹,

Nakazawa²,

Kamei³

et al. 2014

2014 44th European Microwave Conference

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“…However, the truncated polarizer [8] is large in length and difficult to process. The rectangular-grooved polarizers were proved to be suitable for the Ka-band and above [9][10][11]. However, the power capacity and available bandwidth of polarizers are restricted for only operating in the waveguide where the dominant mode is accessible.…”

Section: Introductionmentioning

confidence: 99%

High-Power Wideband Elliptical-Grooved Over-Mode Circular Waveguide Polarizer

Kong¹,

Li²,

Wang³

et al. 2020

PIER Letters

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The available polarizers either cannot afford gigawatt-class high-power microwave applications or are large in length. In this letter, a novel grooved polarizer is proposed. The grooves are proposed to be created in an over-mode circular waveguide to improve the power capacity and bandwidth. Moreover, the symmetric elliptical grooves are adopted to suppress high-order modes and realize the desired phase difference. An X-band polarizer prototype is designed and manufactured with length of 91 mm. Simulated results show that the power capacity of the polarizer is more than 1.5 GW. Measured results in accordance with simulations show that the axial ratio is less than 3 dB from 8.6 to 12.2 GHz, with relative bandwidth of 34.6%. The measured return losses are better than −12.7 dB in the same frequency range.

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“…1c is the simplest method, so that the various of WG-CP models have been developed [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The models in [1][2][3][4][5][6][7][8][9][10] are the WG-CP without stepped septum, and [11][12][13][14][15][16][17][18] are the stepped septum-type WG-CPs, which are hereafter simply referred to as SST-CP. Although most of the well-known WG-CPs have less fractional Fig.…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Suppress the Effect of Machining Error for Waveguide Septum Circular Polarizer at 230 GHz Band in Radio Astronomy

Harada

Tokuda

Kimura

et al. 2017

J Infrared Milli Terahz Waves

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A new stepped septum-type waveguide circular polarizer (SST-CP) was developed to operate in the 230 GHz band for radio astronomy, especially submillimeter-band VLBI observations. For previously reported SST-CP models, the 230 GHz band is too high to achieve the design characteristics in manufactured devices because of unexpected machining errors. To realize a functional SST-CP that can operate in the submillimeter band, a new method was developed, in which the division surface is shifted from the top step of the septum to the second step from the top, and we simulated the expected machining error. The SST-CP using this method can compensate for specified machining errors and suppress serious deterioration. To verify the proposed method, several test pieces were manufactured, and their characteristics were measured using a VNA. These results indicated that the insertion losses were approximately 0.75 dB, and the input return losses and the crosstalk of the left-and right-hand circular polarization were greater than 20 dB at 220-245 GHz on 300 K. Moreover, a 230 GHz SST-CP was developed by the proposed method and installed in a 1.85-m radio telescope receiver systems, and then had used for scientific observations during one observation season without any problems. These achievements demonstrate the successful development of a 230 GHz SST-CP for radio astronomical observations. Furthermore, the proposed method can be applicable for observations in higher frequency bands, such as 345 GHz.

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A design of novel grooved circular waveguide polarizers

Cited by 71 publications

References 3 publications

Prototype of 32-element horn antenna array for imaging reflector antenna of 21-GHz band broadcasting satellite

Prototype of 32-element horn antenna array for imaging reflector antenna of 21-GHz band broadcasting satellite

High-Power Wideband Elliptical-Grooved Over-Mode Circular Waveguide Polarizer

A New Approach to Suppress the Effect of Machining Error for Waveguide Septum Circular Polarizer at 230 GHz Band in Radio Astronomy

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