Quality factor of helical coaxial cavity resonators with modulated radius

Giuseppe Salza; Jaione Galdeano; George Goussetis; Savvas A. Kosmopoulos; Marco Guglielmi

doi:10.1109/EuMC.2014.6986430

Quality factor of helical coaxial cavity resonators with modulated radius

Giuseppe Salza, Jaione Galdeano, George Goussetis, Savvas A. Kosmopoulos, Marco Guglielmi

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

This paper presents an analytical method for the estimation of the unloaded quality factor of helical coaxial cavity resonators in the case where the radius of the helix is modulated along the direction of its axis. The method exploits closed form expressions available for the electric and magnetic fields in the sheath helix. Appreciating that the ratio of stored versus dissipated power in each helix turn is independent of the field distribution within the resonator, the aforementioned closed form expressions readily enable the estimation of the Q-factor for arbitrary modulation of the helix radius. In earlier works, the reduction of the helical core towards the open end of the resonator has been proposed as means to increase the power handling capability. The work presented in this paper is a critical step towards optimizing the trade-off between Q-factor and power handling performance in helical coaxial cavity resonator filters.

Original language	English
Title of host publication	2014 44th European Microwave Conference (EuMC)
Publisher	IEEE
Pages	303-306
Number of pages	4
ISBN (Print)	9782874870354
DOIs	https://doi.org/10.1109/EuMC.2014.6986430
Publication status	Published - 15 Dec 2014
Event	2014 44th European Microwave Conference - Rome, Italy Duration: 6 Oct 2014 → 9 Oct 2014

Conference

Conference	2014 44th European Microwave Conference
Abbreviated title	EuMC 2014
Country/Territory	Italy
City	Rome
Period	6/10/14 → 9/10/14
Other	Held as Part of the 17th European Microwave Week, EuMW 2014

Keywords

coaxial cavity resonators
filters
helical resonators
Q-factor
unloaded quality factor

ASJC Scopus subject areas

Electrical and Electronic Engineering

Access to Document

10.1109/EuMC.2014.6986430

Cite this

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title = "Quality factor of helical coaxial cavity resonators with modulated radius",

abstract = "This paper presents an analytical method for the estimation of the unloaded quality factor of helical coaxial cavity resonators in the case where the radius of the helix is modulated along the direction of its axis. The method exploits closed form expressions available for the electric and magnetic fields in the sheath helix. Appreciating that the ratio of stored versus dissipated power in each helix turn is independent of the field distribution within the resonator, the aforementioned closed form expressions readily enable the estimation of the Q-factor for arbitrary modulation of the helix radius. In earlier works, the reduction of the helical core towards the open end of the resonator has been proposed as means to increase the power handling capability. The work presented in this paper is a critical step towards optimizing the trade-off between Q-factor and power handling performance in helical coaxial cavity resonator filters.",

keywords = "coaxial cavity resonators, filters, helical resonators, Q-factor, unloaded quality factor",

author = "Giuseppe Salza and Jaione Galdeano and George Goussetis and Kosmopoulos, {Savvas A.} and Marco Guglielmi",

year = "2014",

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doi = "10.1109/EuMC.2014.6986430",

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note = "2014 44th European Microwave Conference, EuMC 2014 ; Conference date: 06-10-2014 Through 09-10-2014",

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TY - GEN

T1 - Quality factor of helical coaxial cavity resonators with modulated radius

AU - Salza, Giuseppe

AU - Galdeano, Jaione

AU - Goussetis, George

AU - Kosmopoulos, Savvas A.

AU - Guglielmi, Marco

PY - 2014/12/15

Y1 - 2014/12/15

N2 - This paper presents an analytical method for the estimation of the unloaded quality factor of helical coaxial cavity resonators in the case where the radius of the helix is modulated along the direction of its axis. The method exploits closed form expressions available for the electric and magnetic fields in the sheath helix. Appreciating that the ratio of stored versus dissipated power in each helix turn is independent of the field distribution within the resonator, the aforementioned closed form expressions readily enable the estimation of the Q-factor for arbitrary modulation of the helix radius. In earlier works, the reduction of the helical core towards the open end of the resonator has been proposed as means to increase the power handling capability. The work presented in this paper is a critical step towards optimizing the trade-off between Q-factor and power handling performance in helical coaxial cavity resonator filters.

AB - This paper presents an analytical method for the estimation of the unloaded quality factor of helical coaxial cavity resonators in the case where the radius of the helix is modulated along the direction of its axis. The method exploits closed form expressions available for the electric and magnetic fields in the sheath helix. Appreciating that the ratio of stored versus dissipated power in each helix turn is independent of the field distribution within the resonator, the aforementioned closed form expressions readily enable the estimation of the Q-factor for arbitrary modulation of the helix radius. In earlier works, the reduction of the helical core towards the open end of the resonator has been proposed as means to increase the power handling capability. The work presented in this paper is a critical step towards optimizing the trade-off between Q-factor and power handling performance in helical coaxial cavity resonator filters.

KW - coaxial cavity resonators

KW - filters

KW - helical resonators

KW - Q-factor

KW - unloaded quality factor

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U2 - 10.1109/EuMC.2014.6986430

DO - 10.1109/EuMC.2014.6986430

M3 - Conference contribution

AN - SCOPUS:84929231298

SN - 9782874870354

SP - 303

EP - 306

BT - 2014 44th European Microwave Conference (EuMC)

PB - IEEE

T2 - 2014 44th European Microwave Conference

Y2 - 6 October 2014 through 9 October 2014

ER -

Quality factor of helical coaxial cavity resonators with modulated radius

Abstract

Conference

Keywords

ASJC Scopus subject areas

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