Higher Order Modes in Rectangular Coaxial Waveguides (Correspondence)

Gruner, L.

doi:10.1109/tmtt.1967.1126510

Cited by 36 publications

(13 citation statements)

References 5 publications

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“…The upper frequency cutoff is set by the next lowest mode that will propagate on the transmission line. Gruner has shown that the mode with the lowest cutoff frequency for a recta-coax line will always be either the or mode [41]. Further, because of symmetry, these modes are the same as the modes in ridged waveguide.…”

Section: Frequency Rangementioning

confidence: 99%

Micromachined rectangular-coaxial transmission lines

Reid

Marsh

Webster

2006

IEEE Trans. Microwave Theory Techn.

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) SPONSOR/MONITOR'S ACRONYM(S)AFRL-SN-HS SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)Electromagnetics Technology Division Sensors Directorate Air Force Research Laboratory 80 Scott Drive Hanscom AFB MA 01731-2909 SPONSOR/MONITOR'S REPORT NUMBER(S) AFRL-SN-HS-JA-2006-0062 DISTRIBUTION / AVAILABILITY STATEMENTDISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. SUPPLEMENTARY NOTESClearance Number ESC-06-0062 ABSTRACTRectangular-coaxial (recta-coax) transmission lines fabricated through a three-dimensional micromachining process are presented. These lines are shown to have significant advantages over competing integrated transmission lines such as microstrip and coplanar waveguides. Design equations are presented for impedance, loss, and frequency range. The equations are confirmed with simulations and measurements. The quality factor of shorted lambda/4 resonators is measured to be 156 at 60 GHz. This corresponds to a line loss of 0.353 dB/cm. Advantages of these lines for passive millimeter-wave circuits including ease of signal routing, high isolation, and signal crossovers are demonstrated with realized lines and couplers. SUBJECT TERMSCoplanar waveguides, couplers, filters, microstrip, millimeter-wave circuits, resonators

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Section: Frequency Rangementioning

confidence: 99%

Micromachined rectangular-coaxial transmission lines

Reid

Marsh

Webster

2006

IEEE Trans. Microwave Theory Techn.

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“…Generally, exact analytical solution is not available for such aperture. However, some approximated solutions are found in [7,8]. For the sake of accuracy, solution of this aperture is carried out using 2-D FEM technique using the same treatment as specified by authors in [3].…”

Section: Feed Geometry and Operating Modesmentioning

confidence: 99%

Wideband Matched Feed Design Employing Conjugate Field Radiated From a Square Choke Excited by Two Slots on a Diagonal Waveguide

Bhattacharjee¹

2018

PIER M

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Abstract-A simple and compact diagonal matched feed structure is proposed for offset reflector antenna, which includes a square choke to radiate the desired conjugate mode (TE 4 : a higher order rectangular coaxial cable mode) for suppressing the cross-polar power of an offset reflector antenna when the reflector is illuminated by the dominant diagonal mode (TE D V : a linear combination of rectangular TE 01 and TE 10 modes) radiated from the aperture of a central diagonal waveguide. Square choke is excited by two identical slots on the central diagonal waveguide using the longitudinal magnetic field of main operating mode TE D V . Wideband conjugate matching as well as impedance matching for broadband operation can be achieved by such radiating main mode and conjugate mode from apertures which are spatially separated. Based on the above configuration, a J-band matched feed structure is designed using HFSS software for a given offset reflector geometry. The proposed matched feed structure is fabricated and measured. The measured results are compared with simulated ones, and close agreements are found.

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“…11 shows the cross section of the rectangular coaxial line. The dimensions are chosen according to [9] and [10] to make the characteristics impedance is close to 50 ohms and the cutoff frequency of the higher modes is above the frequency band of the designed filter.…”

Section: Rectangular Coaxial Filters Synthesismentioning

confidence: 99%

Dimensional Synthesis for Wide-Band Bandpass Filters With Quarter-Wavelength Resonators

Lu¹

2009

PIER B

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Abstract-This paper presents a dimensional synthesis method for designing wide-band quarter-wavelength resonator bandpass filters. In this synthesis method, an alternative lowpass prototype filter and the edge frequency mapping method are proposed and applied. The improved K-and J-inverter model with the exponent-weighted turns ratio is also proposed in order to incorporate the frequency dependence of inverters. Based on the edge frequency mapping method and the improved inverter model, an iterative dimensional synthesis procedure is then presented. As design examples, a four-pole rectangular coaxial bandpass filter with 63% fractional bandwidth is designed and fabricated. The simulation and measurement results show good equal ripple performance in the passband.

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Higher Order Modes in Rectangular Coaxial Waveguides (Correspondence)

Cited by 36 publications

References 5 publications

Micromachined rectangular-coaxial transmission lines

Micromachined rectangular-coaxial transmission lines

Wideband Matched Feed Design Employing Conjugate Field Radiated From a Square Choke Excited by Two Slots on a Diagonal Waveguide

Dimensional Synthesis for Wide-Band Bandpass Filters With Quarter-Wavelength Resonators

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