Two-port Antenna Research Articles

Asymmetrical CPW-Fed Circularly Polarized Two-Port MIMO Antenna for Satellite and Wi-Fi 6E Communication

A circularly polarized compact two-port MIMO antenna is presented along with asymmetrical CPW feed and a novel decoupling structure. The asymmetric CPW feed of the antenna is improving the impedance matching significantly and shifting the operating band towards the lower frequency. The novel inverted Z-shaped decoupling is used to enhance the isolation which mitigates the surface wave effectively between two antennas. The triangular-shaped inductive stubs are unified in the inverted Z-shaped decoupling structure which is used to perturb the surface wave movement and to influence the circular polarization (CP) behaviour in the two-port antenna. MIMO antenna obtains the 10 dB impedance bandwidth (IBW) from 6.38 GHz to 6.84 GHz along with minimum port isolation of 30 dB. The 3-dB axial ratio (AR) is obtained from 6.59 to 6.84 GHz frequency which is 52.1% of the total 10 dB IBW of the antenna. The proposed work can be prominent for super-extended C-band of satellite communication and Wi-Fi 6E U-NII6 and U-NII7 communication.

Compact two-port antenna with high isolation based on the defected ground for THz communication

The two-port antenna is designed for THz communication where isolation is achieved with the defective ground. The radiator of the two-port antenna is inspired by the half-cutting technology which reduces the size and makes it a compact antenna. The T-shaped stub and open-ended slot are used to modify the capacitive and inductive reactance which diminish and discontinued the surface current to improve the port isolation. The T-shaped stub improves the electric length of the ground and enhances the port isolation by up to 3.4 dB and open-ended slot in the ground is used to weaken the mutual current and create the non-uniform current which intensifications the port isolation up to 7.7 dB at 2.2 THz. The dimensions of the design is 100 µm × 105 µm and the edge distance of the antennas is only 0.20λ with maximum isolation is 30 dB at 2.2 THz. The bandwidth of the two-port antenna is 1.74 THz to 2.52 THz that can be applicable in wireless communication applications.

Design and Development of Ultrabroadband, High-Gain, and High-Isolation THz MIMO Antenna with a Complementary Split-Ring Resonator Metamaterial.

The need for high-speed communication has created a way to design THz antennas that operate at high frequencies, speeds, and data rates. In this manuscript, a THz MIMO antenna is designed using a metamaterial. The two-port antenna design proposed uses a complementary split-ring resonator patch. The design results are also compared with a simple patch antenna to show the improvement. The design shows a better isolation of 50 dB. A broadband width of 8.3 THz is achieved using this complementary split-ring resonator design. The percentage bandwidth is 90%, showing an ultrabroadband response. The highest gain of 10.34 dB is achieved with this design. Structural parametric optimization is applied to the complementary split-ring resonator MIMO antenna design. The designed antenna is also optimized by applying parametric optimization to different geometrical parameters. The optimized design has a 20 µm ground plane, 14 µm outer ring width, 6 µm inner ring width, and 1.6 µm substrate thickness. The proposed antenna with its broadband width, high gain, and high isolation could be applied in high-speed communication devices.

Two-Port Antenna Based on Shorting Pins and Open-Ended Slots with T-Shaped Stub for Isolation Enhancement

In this paper, a compact two-port antenna consisting of an open-ended slot loaded with shorting pins and a T-shaped stub is presented. The beak-shaped two-port antenna radiators enhance the antenna bandwidth and electrical length. The two inverted L-shaped open-ended slots form an effective capacitance and an inductance, resulting in a dual-operating band. The T-shaped stub improves electrical height and impedance matching to ground, while the combination of the T-shape and open-ended slots provides a dual-band response and improves isolation by up to 8 dB. Shorting pins connected to the ground show inductive behavior that improves isolation by up to 6 and 4 dB for the low- and high-frequency bands. The two-port antenna exhibits more than 20 dB of isolation with only 2 mm of edge-to-edge distance of the antenna element. The two-port antenna operates in dual frequencies from 4.1 GHz to 4.6 GHz and from 5.55 GHz to 6 GHz, and the 32 mm × 26.5 mm size makes it suitable for 5G and WLAN/ISM applications.

Characteristic Mode Analysis-Based Compact Dual Band-Notched UWB MIMO Antenna Loaded with Neutralization Line.

The advancement of electronic gadgets makes it possible for a device to be multipurpose, which calls for attributes such as compactness and larger bandwidth, with improved data transfer rate. This paper introduces the compact, closely placed two-port dual band-notched UWB antenna using a neutralization line as a decoupling structure. The projected antenna design comprised a circle and rectangle embedded monopole radiator with the defected ground structure to attain the UWB spectrum. Further dual notches are attained by carving the U-shape and inverted U-shape slots on the feedline and radiator. The dual band-notched UWB antennas are placed with the separation of 3.8 mm (0.04 λ; λ is computed using 3.4 GHz frequency). The coupling effect between the close proximity elements is decoupled using the neutralization line. The presented antenna has overall dimensions of 21.5 × 28 × 1.6 mm3 (0.24 × 0.31 × 0.01 λ3) and exhibits S11 below −10 dB from 3.4–11.9 GHz, with isolation better than 16 dB throughout the impedance bandwidth. The antenna also provides frequency band rejection of 4.5–5.3 GHz and 7.2–9 GHz covering the WLAN and entire X-band satellite communication. The projected antenna is explored through characteristic mode analysis, time-domain characteristics, and MIMO diversity features to analyze the effectiveness and usefulness of the antenna. The group delay is less than 1 ns except for the frequency rejection band and fidelity factor greater than 0.96. The projected antenna exhibits MIMO diversity metrics ECC < 0.3, DG > 9.6 dB, MEG < −3 dB, TARC < −10 dB, CCL < 0.3 bps/Hz, and ME < −2 dB across the operational frequency, except for the notched bands. The designed two-port antenna is validated by printing on an FR4 substrate. The simulated and measured findings are in line with and appropriate for MIMO wireless applications.

A High-Gain and Wideband MIMO Antenna for 5G mm-Wave-Based IoT Communication Networks

In this paper, an antenna with a multiple-input, multiple-output (MIMO) configuration is demonstrated for mm-wave 5G-based Internet of Things (IoT) applications. The two antenna elements are arranged next to each other to form a two-port antenna system such that significant field decorrelation is achieved. Moreover, a dielectric layer is backed by an eventual multiport system to amend and analyze the radiation characteristics. The overall size of the MIMO configuration is 14 mm × 20 mm, and the operation bandwidth achieves ranges from 16.7 to 25.4 GHz, considering the −10 dB criterion with a maximum isolation of more than −30 dB within the operating band. The peak gain offered by the antenna system is nearly 5.48 dB, and incorporating a dielectric layer provides an increase in the gain value to 8.47 dB. Within the operating band, more than 80% total efficiency is observed, and analysis shows several MIMO performance metrics with favorable characteristics. The compactness of the proposed design with high isolation, improved gain, and wideband features make it a suitable candidate for mm-wave-based 5G applications.

Tuning the higher to lower order resonance frequency ratio and implementing the tunable THz MIMO/self-diplexing antenna

The frequency ratio of higher to lower order mode can be electronically tuned in a terahertz (THz) antenna with metallic radiator using a graphene loop. Antenna is designed with slotted metallic radiator to obtain the dual-band response with fundamental and second order transverse magnetic mode providing the directional and bi-directional radiation pattern in the lower and upper band, respectively. The insertion of graphene loop and varying its chemical potential (μc) provides two resonances until 0.4eV and four resonances for further greater values of μc. The desired impedance matching can be achieved at the frequencies of any two resonances at a time by selecting an appropriate value of μc. Antenna can operate with higher/lower order mode centred at frequency 3.77/3.02 THz and 4.39/2.86 THz for the values of μc as 0.9 and 0.3eV , respectively. The frequency ratio of higher to lower order mode can be tuned within the range of 1.22–1.59 with the variation in μc. Also, application of graphene loop confines the radiated power in a single direction at the frequency of higher order mode making the radiation pattern consistent. Antenna can be utilized in future THz wireless applications which require the utilization of adjacent channels with different frequencies in communication. Also, a two-port antenna is designed which can offer the tunable multi-input–multi-output (MIMO) and self-diplexing capability with pattern diversity. The MIMO parameters; envelope correlation coefficient (ECC) and diversity gain (DG) is evaluated and their values are found within acceptable limits as ECC<0.06 and DG>9.9 in the operating bands.

Compact quadband two-port antenna with metamaterial cell-inspired decoupling parasitic element for mobile wireless applications

Abstract In this paper, a quadband MIMO diamond-shaped antenna with two highly isolated elements is proposed and discussed. A novel metamaterial cell-inspired decoupling parasitic structure is deployed between the two antenna elements to achieve high isolation greater than 20 dB in the frequency bands of interest. Moreover, the design adopts a defected ground structure and open-ended multiple diamond-shaped branches for multiband characteristics, enabling the proposed MIMO to cover several modern wireless applications. The performance metrics of the proposed MIMO antenna are validated by evaluating various diversity parameters such as envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), and channel capacity loss (CCL). This antenna is fabricated on an FR4 substrate with a compact size of 12 × 30 × 1.524 mm (0.082λ 0 × 0.204λ 0 × 0.001λ 0, λ 0 is the wavelength at 2.04 GHz). With the edge-to-edge separation distance of 0.053λ 0 between the antenna elements, its prototype is experimentally measured using a two-port Rohde &amp; Schwarz ZVA50 Vector Network Analyzer. The port-to-port isolation is about −20.87 dB, −23 dB, −25.93 dB, and −25.22 dB for 2.3 GHz, 3.18 GHz, 4.08 GHz, and 5.42 GHz frequency bands, respectively. Also, the proposed MIMO antenna exhibits good diversity performances with the ECC &lt; 0.005, DG &gt; 9.99, and TARC&lt;−10 dB making it an outstanding candidate covering 4G/LTE, 5G NR sub-6 GHz n40/n41/n77/n78, Wi-Fi, WiMAX, ISM, WBAN, Bluetooth, MBAN, WiBro, C-V2X, and UWB applications.

A thin shared radiator based ACS‐fed orthogonal pattern diversity antenna with physical tilt for mmWave 5G access points

A low profile and compact two-port antenna is proposed for mmWave 5G access point applications. Since the overall space inside a typical mmWave 5G access point is limited, a small form factor based antenna module is proposed. The two-port antenna shares a common radiator that miniaturizes the overall antenna module. The proposed antenna comprises of single-layered asymmetric coplanar strip (ACS)-fed shared radiator with wide operating bandwidth ranging from 25 to 31 GHz that accounts for fractional bandwidth of 21.4%. The two-port antenna elements are oriented at right angles to each other for obtaining orthogonal pattern diversity (OPD) thereby obtaining wide angular coverage in the E-plane. Vertical linear corrugations with varying lengths are incorporated for decreasing mutual coupling between these two antenna elements and producing a uniform high gain end-fire radiation pattern. Isolation of around 4 dB is enhanced by insertion of these vertical corrugations. The proposed antenna attains peak gain of 7.2 dBi with high pattern integrity over the entire operational frequency band. The presented OPD antenna occupies overall area of 74.75 mm2 which is minimal. Moreover, implementation of the proposed antenna inside a typical mmWave 5G access point is also demonstrated. Simulation and measured results are presented with adequate technical explanation.

Direction Finding of RFID Tags in UHF Band Using a Passive Beam-Scanning Leaky-Wave Antenna

This work proposes a novel system for location applications of RFID tags in UHF band. The system is based on a frequency-scanning leaky-wave antenna (LWA), commodity hardware and Angle-of-Arrival (AoA) estimation of the signal reflected from RFID tags, by using only RSSI (Received Signal Strength Indicator) data. The LWA is completely passive, manufactured in simple printed technology and directly connected to the RFID reader. The dispersive nature of the LWA combined with the selection of a proper high permittivity substrate allows the radiation of frequency steered directive beams. The system is based on four directive beams created by the two-port antenna and two RFID channels to estimate the AoA by amplitude-monopulse signal processing and angular pseudospectrum technique. Thus, our approach is efficient, simple and low-cost, since the use of expensive or complex hardware required for electronic phased-array steering/beam-switching is avoided and the required computational load is low. Several experiments have been performed in different scenarios, reporting a wide FoV of 130&#x2218;, multi-tag detection and a RMSE of 8,1&#x2218;.

High-Isolation UWB MIMO Antenna with Multiple X-Shaped Stubs Loaded between Ground Planes

A miniaturized ultra-wideband multiple-input multiple-output (UWB MIMO) two-port antenna with high isolation based on FR4 is designed in this article. The size of the antenna is only 18 × 28 × 1.6 mm3. The MIMO antenna consists of two identical antenna elements symmetrically placed on the same dielectric substrate in opposite directions. By loading three crossed X-shaped stubs between two unconnected ground planes, high isolation and good impedance matching are achieved. The working frequency band measured by this UWB MIMO antenna is 1.9–14 GHz, and the isolation is kept above 20.2 dB in the whole analysis frequency band. Good radiation characteristics as well as envelope correlation coefficient (ECC, &lt;0.09), mean effective gain (MEG), and channel capacity loss (CCL) in the passband meet the requirements of the application, which can be applied to the UWB wireless communication system. To verify the applicability of the proposed method for enhancing the isolation between antenna elements, the two-port antenna structure was extended to a four-port antenna structure. In the case of loading the X-shaped stubs to connect to the ground plane, the isolation of the antenna is maintained above 15.5 dB within 1.7–14 GHz.

A metamaterial‐based compact multiple‐input multiple‐output antenna with pattern diversity

A compact multiple-input multiple-output (MIMO) antenna is proposed with dual-mode pattern diversity. A two-port antenna with a single radiator is designed based on the composite right/left-handed transmission-line (CRLH-TL) theory. An omnidirectional radiation pattern is excited by the port 1, while a directional radiation pattern is excited by the port 2. When the omnidirectional radiation pattern is excited, the antenna can be regarded as a radial CRLH-TL-based resonator. When the directional radiation pattern is obtained, the antenna is modeled as a circular patch antenna. The two different radiation patterns are integrated in one antenna with low complexity and low cost. The electrical size of the proposed antenna is 0.6 × 0.6λ2 (at 3 GHz). A low profile of only 0.07λ is obtained. The antenna works at the 3 GHz band. The measured −10 dB bands for port 1 and port 2 are 2.71–3.06 GHz and 2.87–2.96 GHz, respectively. A low mutual coupling below −30 dB between the two radiators is achieved, which decrease the channel correlation significantly.

Size Miniaturization and Isolation Enhancement of Two-Element Antenna for Sub-6 GHz Applications

In this paper, a two-port dual-band antenna is designed with high isolation. The beak-shaped radiator and open stubs are used to achieve miniaturization of the antenna. A T-shaped stub is used to isolate the antenna at higher frequencies whereas open-ended slots effectively miniaturized the antenna size thereby increasing the impedance and isolation by more than 20 dB. The isolation is enhanced due to the suppression of current between radiators without increasing the size of the MIMO antenna for lower frequencies. The proposed antenna parameter CCL, DG, TARC and ECC reflects better diversity performance. The two-port antenna covers 2570, 2300, 2496, 3400, 3600 MHz (LTE 38, 40, 41, 42, 43) 2500, 3500, 3700 MHz (5G n7, n48, n77) 5.15/5.85 GHz (WLAN), 2.4/5.0 GHz (Wi-Fi) and 2.45/5.8 GHz (ISM) sub-6 GHz bands and can be a good choice for wireless communication.

Circularly polarized CPW fed MIMO/Diversity antenna for Wi-Fi and WLAN applications

Abstract In this paper, circular polarized two-element and eight-element CPW fed MIMO/Diversity antenna with defected ground is presented. The dimension of the two-port antenna is 30 mm × 30 mm whereas the edge-to-edge gap between radiating elements is 5.65 mm. The |S11| in dB varies from 4.95 to 5.95 GHz with a gain up to 4.1 dB and efficiency is more than 90%. The isolation of two-element CPW antenna is more than 20 dB with open and diagonal stub in the ground whereas more than 18.7 dB for eight-element antenna without decoupling network. The circular and rectangular stub perturbs the surface current in the ground and is responsible for RHCP and LHCP in two-elements and eight-elements antenna where it covers the complete operating band. The acceptable ECC, TARC, DG, and CCL values of the antenna are determined which represents the diversity characteristics of the antenna. The Wi-Fi/WLAN applications can be fulfilled with the proposed two and eight-element antenna.

Novel H-shaped EBG in E-plane for Isolation Enhancement of Compact CPW-fed Two-Port UWB MIMO Antenna

This paper intends to find out how to diminish the mutual coupling of closely spaced two-port antenna elements with a novel H-shaped EBG in the E-plane. The UWB MIMO antenna isolation is more than 20 dB in the entire operating frequency. The maximum isolation is up to 37 dB, obtained by the two-unit cell EBG placed between two CPW-fed antenna elements. Two-unit cell EBG is altering the current between radiating elements and enhancing up to 10 dB isolation. The proposed EBG decoupling MIMO antenna size is 35 mm × 22 mm and designed on the FR-4 substrate. The |S11| (in dB) varies from 3.4 to 10.4 GHz and covering most of UWB frequencies. This antenna has realized gain of more than 4 dB on a broader bandwidth with ECC and CCL under 0.01 and 0.35 bits/sec/Hz, respectively, across the entire 10 dB bandwidth.

Low‐profile wideband patch antenna with pattern diversity using custom‐designed feeding schemes

A low-profile wideband patch antenna with pattern diversity is proposed in this paper. In our design, custom-designed feeding schemes are utilized to substitute for conventional power dividers beneath the ground plane, thus selectively generating the broadside or conical beam and introducing additional resonant modes. Then, by placing two novel feeding schemes orthogonally to realize pattern diversity, a new resonant mode is successfully excited, which fully makes use of the configuration of the two-port antenna. Moreover, for reallocating radiating modes, an array of four shorting pins is introduced to push up the resonant frequency of each first desired resonant mode, which enhances the overlapped impedance bandwidth. Finally, the proposed antenna is designed, fabricated, and measured. The measured results show that the antenna achieves a broad overlapped impedance bandwidth of around 28.5% ranging from 2.11 to 2.81 GHz. Meanwhile, the peak-measured gain is 7.0 dBi for the conical beam and 9.9 dBi for the broadside beam, while an isolation of 23 dB is also realized. Most importantly, novel feeding schemes still maintain the low-profile property of around 0.066 λ0 (λ0 is the free-space wavelength at 2.46 GHz).

Design of a Stacked Co-Polarized Full-Duplex Antenna With Broadside Radiation

This article presents a co-linearly polarized (LP) stacked two-port antenna with compact size and broadside radiation patterns for in-band full-duplex (IBFD) application. The proposed IBFD antenna consists of a patch antenna and a substrate integrated waveguide (SIW) cavity-backed slot antenna (CBSA). The patch antenna and the CBSA are used as the transmitter (Tx) and receiver (Rx), respectively. The Rx is placed above the Tx for compact size. Linear polarization and broadside radiation patterns are achieved in this article. A cavity-patch coupling (CPC) path is added for canceling the slot-patch coupling (SPC) by using four probes to connect the top layer of the SIW cavity and the metal ground. Parametric studies show that the two coupling paths can be adjusted independently. Experimental results illustrate that the measured highest isolation over 40 dB is obtained with a compact size of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$30\times 30\times {4}$ </tex-math></inline-formula> mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.63\lambda _{0} \times 0.63\lambda _{0} \times 0.08\lambda _{0}$ </tex-math></inline-formula> , <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda _{0}$ </tex-math></inline-formula> is the free-space wavelength at the center frequency of about 6.29 GHz). The measured −10 dB bandwidths of the Tx and Rx antennas are 430 and 100 MHz, respectively. The proposed stacked IBFD antenna is validated with the merits of identical polarization, same radiation direction, and compact size.

Ultra-Wideband, Compact, and High-Gain Two-Port Antenna System for Full-Duplex Applications

A broadband, dual-polarized, and common-aperture <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2\times 2$ </tex-math></inline-formula> cavity-backed slot antenna (CBSA) array for enabling full-duplex wireless communication is presented. The antenna consists of a thin rectangular cavity appropriately loaded with metallic septa to excite multiple resonances of similar desired field distribution to achieve consistent radiation characteristics over a wide bandwidth. Four pairs of concentric orthogonal radiating slots are cut out on one of the broad walls of the cavity all of which are fed by two concentric orthogonal slots on the opposite broad wall of the cavity. The cavity is fed by an end-launch coaxial-to-waveguide transition to excite one of the channels. The other channel is excited by a two-pronged microstrip line symmetrically crossing over the other cavity feeding slot. Due to the out-of-phase coupling from the two prongs of the microstrip line to the other port, this type of excitation is shown to provide an unprecedented level of isolation between the two channels over a wide bandwidth. To achieve a high-efficiency and fabrication accuracy of this complex architecture, the antenna is 3-D printed out of HP PA12 Nylon and is then metalized by the silver spraying technology. The fabricated antenna provides a minimum of 55 dB of isolation and 8 dB of return loss over 44% fractional bandwidth from 4.8 to 7.5 GHz. Keeping its size smaller than <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1.3 \lambda _{L} \times 1.3\lambda _{L} \times 0.27\lambda L$ </tex-math></inline-formula> (where <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda _{L}$ </tex-math></inline-formula> is the free space wavelength at the lowest frequency), and its weight less than <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$70g$ </tex-math></inline-formula> , the antenna provides a minimum gain of 10 dB for both polarizations and exhibits more than 20 dB polarization discrimination within the main beam over the entire band.

Antenna Decoupling Based on Self-Resonance Frequencies of Common Mode and Differential Mode

This article presents a simple and effective decoupling approach based on the common mode (CM) and differential mode (DM) analysis to solve decoupling problem between two symmetrical antenna elements. Especially, the concept of the self-resonance frequencies of CM and DM is utilized in antenna decoupling analysis. It is found that when the self-resonance frequencies of CM and DM are the same, strong mutual coupling between two symmetrically and closely placed two-port antennas can be completely eliminated. The difference between self-resonance frequency and resonance frequency is discussed; and the method of obtaining the self-resonance frequencies of CM and DM is given. Since the proposed antenna decoupling judgment condition is straightforward and simple, it can effectively deal with any kind of closely placed antenna system with a plane of symmetry; and obtain good decoupling effect simply and easily. The effectiveness, feasibility and advantage of the proposed decoupling condition for the CM and DM analysis are demonstrated through several symmetrical two-port antenna examples. The decoupling approach proposed in this article can undoubtedly make the common mode and differential mode analysis for solving antenna decoupling problems more effective and practical.

Batteryless and Self-Reconfigurable Multimode RF Network using All-Passive Energy Smart-Sensing

In recent years, replacing the external control stimuli with internal control using characteristics of radio frequency (RF) signals (such as waveform or power level) has attracted considerable attention to the design of reconfigurable multifunctional RF devices. However, even with the most exciting techniques, the control process always needs a chip-based system to sense the power level or waveform of the incident RF signal, which is realised by additional supporting electronic components of the sensing and microcontroller circuits. Therefore, to achieve a batteryless structure, a majority of conventional works focus on using energy harvesters to convert energy from external environmental sources to DC energy for the electronic circuits. Herein, we propose a novel alternative approach to replace the traditional energy harvesters in batteryless RF devices with all-passive energy smart-sensing circuits. By exploiting the features of a nonlinear semiconductor device under different incident RF power values, the proposed network can passively self-sense the RF power level and dynamically self-control RF signal flow and power ratio. The operation of the proposed network can be considered as purely self-adaptation with control from the RF power level. Moreover, normal RF devices can be transformed to all-passive and batteryless purely self-reconfigurable devices via integration with the proposed structure. As proof of concept, the proposed network is integrated with a two-port antenna to experimentally demonstrate its purely self-reconfigurable polarisation. The proposed strategy is hereby expected to extend the field of batteryless self-reconfigurable multifunctional RF devices and pave promising new paths for the development of future intelligent, smart RF devices.