CST

A Multi-Frequency Microstrip-fed Annular-Slot Antenna

This note describes a multi frequency annular slot antenna. The design is based on the paper: “A Multi-frequency Microstrip-fed Annular Slot Antenna” by Hooman Tehrani and Kai Chang. The entire structure is defined parametrically to allow optimisation and parametric studies. The setup process in CST MICROWAVE STUDIO® takes about 10 to 15 min for an experienced user.


Design of the Annular Slot Antenna. To allow optimisation the entire structure is defined parametrically.
Figure 1: Design of the Annular Slot Antenna. To allow optimisation the entire structure is defined parametrically.

The substrate has a thickness of 0.762 mm and a dielectric constant of 2.45. The width of the 50 Ohm Microstrip line is 2.16 mm. All other dimesions can be found in following table. All values are in mm.


Parameter definition. All values are in mm
Figure 2: Parameter definition. All values are in mm

Calculation Results

The simulation results agree very well with the published results (Figure 3). Several slot resonances are excited. The simulated resonance frequencies are at 3.5 GHZ, 4.5 GHz and 6.5 GHz respectively.


Comparison of published and MWS Results.
Figure 3: Comparison of published and MWS Results.


Radiation Pattern at 3.5 GHz, 4.5 GHz and 6.5 GHz
Figure 4: Radiation Pattern at 3.5 GHz, 4.5 GHz and 6.5 GHz


CST Article "A Multi-Frequency Microstrip-fed Annular-Slot Antenna"
last modified 28. Feb 2008 10:42
printed 28. Jul 2016 12:24, Article ID 52
URL:

All rights reserved.
Without prior written permission of CST, no part of this publication may be reproduced by any method, be stored or transferred into an electronic data processing system, neither mechanical or by any other method.

Feedback

This article has not been voted yet

Did you find this article useful?

Other Articles

Designing Building Structures for Protection against EMP and Lightning

Designing Building Structures for Protection against EMP and Lightning
This article will explore the use of electromagnetic simulation when hardening facilities against EMP and lightning. EMP is a high-intensity burst of electromagnetic energy that can potentially cause major disruption to vital infrastructure such as telecommunications, electrical power, banking and finance, emergency services, medical facilities, transportation, food and water supply. Lightning can cause significant damage by directly striking a building, when metallic structures such as electrical wiring provide return current flow in an attempt to equalize potentials. It is therefore essential to protect or “harden” critical facilities by stringent electromagnetic design, including shielding to block incident EMP fields, careful treatment of points of entry (POE) and diversion of lightning currents using down-conductors. This article shows how a simulation of the performance of EMP protection measures at the point of entry, such as filtering and clamping, can be set up and carried out. The simulation of a lightning strike to a building structure is also demonstrated, to show how the induced current return paths can be visualized in order to characterize the possible effect of the lightning strike on systems inside the building. This includes an investigation of cable system positioning inside the building and the prediction of induced shield and internal load currents and the analysis of lightning protection system (LPS), taking into account the effect of down-conductor type and grounding impedance. Read full article..

Optimization of a small wideband Antenna using CST and Mode Frontier

Optimization of a small wideband Antenna using CST and Mode Frontier Document type
Yael Kaldor, Rafael This work describes the simulation and optimization processes of a small antenna located on a large platform. (The platform size is 13? x 3? x 3?). The required antenna frequency performance is wideband and it is required to perform under severe environmental conditions. The antenna structure was modeled and simulated using CST (MWS) for return Loss and Radiation Pattern performance. The antenna model was parameterized to allow future optimization. The Return Loss specification for the Antenna was -8 dB maximum (VSWR 2.2:1) over a 30% bandwidth. Simulated Return Loss was initially poor over the full frequency range (sufficient performance was obtained over 6% bandwidth only). See Figure 1. The Antenna model was optimized using Mode Frontier for Return Loss performance over the full frequency range. The optimization results are depicted in Figure 2. The Return loss and VSWR performance were highly improved using the optimization process. 34% bandwidth was obtained. Read full article..

Antenna design 3:RFID tag antennas using AMCs

Antenna design 3:RFID tag antennas using AMCs Document type
Antenna design 3:RFID tag antennas using AMCs Read full article..

Direct transient co-simulation of a Step Recovery Diode (SRD) Pulse Generator

Direct transient co-simulation of a Step Recovery Diode (SRD) Pulse Generator
The unique network co-simulation feature in CST STUDIO SUITE™ 2009 enables a direct transient simulation of a 3D CST MICROWAVE STUDIO® (CST MWS) structure with non-linear lumped components or circuit networks in CST DESIGN STUDIO™ (CST DS). This article shows the application of this feature to the simulation of a Step Recovery Diode (SRD) pulse generator. Read full article..

Bandpass Waveguide Filter with Dual Mode Cavities

Bandpass Waveguide Filter with Dual Mode Cavities
This waveguide filter has been simulated with CST MICROWAVE STUDIO® general purpose frequency domain solver applying a tetrahedral mesh. Read full article..
Back Back  

Your session has expired. Redirecting you to the login page...