In this report three staircase UWB antennae with WLAN band notch characteristic, each having different ground planes, are presented. These include a Co-Planar Waveguide-fed antenna, a Transmission Line-fed antenna with partial ground plane having a Defected Ground Structure (DGS) and a Transmission Line-fed antenna with slotted ground plane. All the band-notched antennae have rejection characteristics at 5 GHz WLAN band (5.15GHz to 5.35GHz and 5.725GHz to 5.825 GHz) while the antenna with slotted ground plane rejects the 4.9GHZ WLAN band (4.94GHz to 4.99GHz) as well. In all the three antennae the WLAN band is notched by embedding a U-shaped slot in the transmission line.
The proposed antennae are carefully designed, simulated and tested in order to fulfill the UWB antennae’s pre-defined criteria. The Simulated and Measured results are found to be in good agreement which show the validity of the suggested designs.
Since the commencement of human civilization, humankind attempts to communicate with each other. It is the process of communication, namely the sharing of information, emotions and feelings that has made the mankind the sterling creation of God. It all started with gestures of hands and sounds produced by the vocal cords and gradually evolved into wired and wireless communication now.
The orthodox wireless systems were long-range narrowband systems, but in order to use the available spectrum, now, UWB (Ultra-Wideband) short-range systems are being used which consume low power and built using low-priced digital components. The Microstrip Antennae are designed to implement UWB systems, because they show effective results for broadband antennae. Ultra-wideband (UWB) antennae are by far the most essential elements for UWB systems. With the launch of the 3.1GHz to 10.6GHz band, applications for short-range and high-bandwidth portable gadgets are major research areas in UWB systems. Consequently, the acknowledgment of UWB antennas in printed-circuit systems within comparatively small substrate areas is of major significance.
Table of Contents
Chapter 1 Introduction
1.1 Overview
1.2 Problem Statement
1.3 Objective
1.4 Methodology
1.5 Compilation of Book
Chapter 2 Ultra WideBand Technology
2.1 Introduction to Antennae
2.2 Parameters of Antennae
2.3 Types of Antennae
2.3.1 Wire Antenna
2.3.2 Aperture Antenna
2.3.3 Array Antenna
2.3.4 Lens Antenna
2.3.5 Reflector Antenna
2.3.6 Microstrip Patch Antenna
2.4 Principles of UWB Technology
2.4.1 General Overview
2.4.2 Introduction to Ultra Wideband Antennae
2.4.3 Working of UWB Technology
2.4.4 Advantages of Ultra WideBand Technology
2.4.5 Disadvantages of Ultra WideBand Technology
2.5 Existing UWB Antennae with Band Notch Designs
Chapter 3 Co-Planar Waveguide-Fed UWB Antenna with 5GHz WLAN Band Notch Characteristics
3.1 Introduction
3.2 Design of the Proposed CPW-Fed Antenna
3.2.1 Ultra WideBand (Without U-Shape Slot)
3.2.2 Ultra WideBand Antenna with WLAN Notch
3.3 Simulated Results of the Proposed Antenna
3.3.1 VSWR with WLAN Notch
3.3.2 Return Loss with WLAN Notch
3.3.3 Radiation Patterns
3.3.4 Current Distribution
3.3.5 Gain vs. Frequency Plot
3.4 Measured Results of the Proposed Antenna
Chapter 4 Transmission Line-Fed UWB Antenna with 5GHz WLAN Band Notch using Partial Ground Plane
4.1 Introduction
4.2 Design of the Proposed TX Line-Fed Antenna with Partial Ground Plane
4.2.1 Ultra WideBand without U-Shape Slot
4.2.2 Ultra WideBand with WLAN Notch
4.3 Simulated Results of the Proposed Antenna
4.3.1 VSWR with WLAN Notch
4.3.2 Return Loss with WLAN Notch
4.3.3 Radiation Patterns
4.3.4 Current Distribution
4.3.5 Gain vs. Frequency Plot
4.4 Measured Results of the Proposed Antenna
Chapter 5 Transmission Line-Fed Slotted Ground Plane UWB Antenna with 4.9GHz and 5GHz WLAN Band Notch Characteristics
5.1 Introduction
5.2 Design of the Proposed TX Line-Fed Antenna with Slotted Ground Plane
5.2.1 Ultra WideBand (Without U-Shape Slot)
5.2.2 Ultra WideBand With WLAN Notch
5.3 Simulated Results of the Proposed Antenna
5.3.1 VSWR with WLAN Notch
5.3.2 Return Loss with WLAN Notch
5.3.3 Radiation Patterns
5.3.4 Current Distribution
5.3.5 Gain vs. Frequency Plot
5.4 Measured Results of the Proposed Antenna
Chapter 6 UWB Applications
6.1 Introduction
6.2 UWB in Communications and Sensors
6.2.1 Low Data Rate
6.2.2 High Data Rate
6.2.3 Home Network Appliances
6.3 UWB Technology in WBAN
6.4 Position Location and Tracking
6.5 Radars
Chapter 7 Conclusion and Future Work
7.1 Conclusion
7.2 Future Work
Objectives and Research Themes
The primary objective of this work is to design and develop compact, high-efficiency Ultra WideBand (UWB) antennae that incorporate specific band-notch characteristics to mitigate interference with existing WLAN systems. The research investigates various feeding techniques and ground plane structures to optimize bandwidth performance while ensuring effective rejection of the 4.9GHz and 5GHz frequency bands.
- Design of UWB antennae covering the 3.1GHz to 10.6GHz range.
- Implementation of staircase design schemes for bandwidth enhancement.
- Integration of U-shaped slots in transmission lines to achieve WLAN band rejection.
- Application of Defected Ground Structures (DGS) and slotted ground planes to fine-tune notch characteristics.
- Validation through comparative analysis of simulated and measured antenna results.
Excerpt from the Book
3.3.1 VSWR with WLAN Notch
The simulated results of the VSWR of the proposed antenna are shown in Figure 3.25. From the Figure it is observed that the antenna has two resonant modes i.e. from 2.844GHz to 5.008GHz and from 5.940GHz to 13.928GHz. From 5.010GHz to 5.938GHz the VSWR>2 which verifies the successful rejection of the unwanted WLAN band.
Summary of Chapters
Chapter 1 Introduction: Provides the project significance, the problem statement regarding interference, and the research objectives.
Chapter 2 Ultra WideBand Technology: Covers fundamental UWB principles, antenna types, parameters, and a review of existing UWB designs.
Chapter 3 Co-Planar Waveguide-Fed UWB Antenna with 5GHz WLAN Band Notch Characteristics: Describes the design, simulation, and parametric analysis of the CPW-fed staircase antenna.
Chapter 4 Transmission Line-Fed UWB Antenna with 5GHz WLAN Band Notch using Partial Ground Plane: Details the development of a transmission line-fed antenna incorporating Defected Ground Structure (DGS).
Chapter 5 Transmission Line-Fed Slotted Ground Plane UWB Antenna with 4.9GHz and 5GHz WLAN Band Notch Characteristics: Discusses the final proposed design using a slotted ground plane to notch both 4.9GHz and 5GHz bands.
Chapter 6 UWB Applications: Outlines the practical utility of UWB technology in communications, WBAN, tracking, and radar systems.
Chapter 7 Conclusion and Future Work: Summarizes the study's achievements and suggests potential improvements for future antenna development.
Keywords
Ultra WideBand, UWB, WLAN, Antenna, Microstrip, Band-notch, VSWR, Return Loss, Staircase Design, Defected Ground Structure, DGS, WBAN, Radar, Signal Integrity, Impedance Matching
Frequently Asked Questions
What is the core focus of this research?
This research focuses on designing compact Ultra WideBand (UWB) antennae that can effectively operate within the 3.1GHz to 10.6GHz range while simultaneously rejecting interference from WLAN frequency bands.
Which specific frequency bands are being notched?
The proposed designs focus on notching the 5GHz WLAN band (5.15GHz to 5.35GHz and 5.725GHz to 5.825GHz), with one specific design also rejecting the 4.9GHz WLAN band.
What is the primary objective of the antenna designs?
The primary goal is to achieve wide impedance bandwidth for UWB applications while maintaining a small, compact structure suitable for portable electronic gadgets.
Which methodology is employed for these antenna designs?
The study uses a staircase geometry design to enhance bandwidth, combined with U-shaped slots in the feed lines and specific ground plane modifications (like DGS or slots) to achieve the band-notch functionality.
What does the main body of the work cover?
The main body details the step-by-step design process of three specific UWB antenna configurations, including parametric analysis, simulated results, and experimental verification via physical prototypes.
How is the success of the band-rejection measured?
Success is determined by analyzing VSWR (Voltage Standing Wave Ratio) and Return Loss (S11) parameters, ensuring that the VSWR value is greater than 2 in the notched frequency ranges.
How does the Defected Ground Structure (DGS) contribute to the design?
The DGS is utilized in the partial ground plane to enhance and fine-tune the rejection characteristics of the WLAN band-notch, leading to better overall performance.
What role does the U-shaped slot play?
The U-shaped slot is embedded in the transmission line of the antenna to act as a stop filter, which effectively blocks the transmission of unwanted frequency signals from WLAN systems.
- Citar trabajo
- Zeeshan Ahmed (Autor), 2013, The WLAN Band-Notching of Ultra WideBand Antennas, Múnich, GRIN Verlag, https://www.grin.com/document/334224
