Antenna Flex PCB application

Antenna Flex PCB application
In our world of fabricating custom electronics, a circuit can generally be defined as “a path between two or more points along which an electrical current is carried”. All Flex designs and fabricates an incredibly diverse set of flexible circuits but we also produce many parts that do not carry current between points. A flexible “circuit” antenna is an example. Flexible circuits consist of a layer of flexible polymer film and a patterned conductive material (generally copper). These custom shaped and patterned devices can also include components soldered to the copper creating an electrical interconnection.
An antenna absorbs electromagnetic waves and turns them into electrical pulses that “replicate” the pulses coming from the source.

FXP290 915MHz Flex PCB Antenna, 100mm Ø1.13
Flexible PCB ISM Antenna
915MHz
Ø1.13, 100mm cable, I-PEX U.FL Comp
Dims: 75*45*0.1mm

Product Links

SKU: FXP290.07.0100A
Categories: 915MHz LoRa Flex Circuit PCB Antennas, Flex Circuit Antennas, Internal 915MHz Antennas, Internal ISM Antennas, Internal LoRa Antennas, LoRa/SigFox/LPWA Antennas, ISM Antennas
Tags: 1.13mm Coax cable, 915MHz, Agriculture, Automotive, Below 200mm, Below one metre, Emergency Services, Hand Held Devices, HD Video, Healthcare, Home Automation, Internal, IPEX MHFI, ISM, LoRa, Marine, PCB, PERS, Sigfox, Smart Grid, Smart Home, Telematics, Telemedicine, Tracking, Wearables (IoT)

In the case of radio transmission, the sound from the source is converted to “waves” that propagate through space. The antenna receives the waves and the radio device turns the pulses into sound. Radio frequency or RF is just one of many ranges of frequencies used in communication devices.
Many electronic devices use wireless signals and thereby need antennas. Because many of these electronic devices have unique packaging constraints, the ideal antenna may need to conform to a variety of shapes, sizes and three dimensional configurations. Antennas from flex materials can be configured into just about any shape and size, and have been described as “origami interconnects”.

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RFDFLEX - Flexible PCB antennas available now
Posted on April 05, 2013

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We have just released a new flexible PCB antenna designed especially for UAV system integrators utilising the RFD900, or other 900MHz band ISM radio.

It is designed to be easy to use, ground plane independent, and have good performance!

The design is quite broad band which lets it be used on a variety of surfaces.

We have tested it on various materials typically found on small, light UAVs and can confirm that performance in free space, on foam, on mylar/solarfilm, on balsa/film surfaces is excellent!

The specified return loss is better than -10dB, however typically achieved values are around -15 to -25dB across the entire 900 MHz ISM band (902-928MHz)

Help needed for understanding placement of flexible PCB GSM antenna

I am using flexible GSM Antenna for my application.I am sticking the antenna on top of my FR4 based PCB board as shown in the below figure. Note that the PCB, on top side (One towards antenna) has GSM module. So effectively, I am sticking the Antenna on top of the module itself with a simple DST acting as boundary between them. The antenna is connected to PCB via UFL connector through co-axial cable. enter image description here I have some questions: 1. Does folding the PCB the way I have mentioned (In the middle) affect the performance due to any interference in the radiating arm?

Should I use rigid PCB antenna instead of flexible one? Are there any important factors I should consider here in making my design decision?
Does keeping the antenna on top of RF module itself with around 0.8 mm separation lead to destructive interference? If yes, how can I tune the physical placement of the antenna for least interference?
P.S - Here is the link to Antenna Datasheet

rf antenna gsm interference gprs

Does folding the PCB the way I have mentioned (In the middle) affect the performance due to any interference in the radiating arm?
The fold will have an impact but it'll be small in comparison to the other issue you have. The antenna is tuned to be stuck to a piece of plastic (2 mm thick ABS in the datasheet). Sticking it to piece of grounded metal (the shield of the GSM module) will completely ruin this tuning. Since the datasheet makes no mention of ground planes you want it to be as far away from any metal as possible.

Should I use rigid PCB antenna instead of flexible one? Are there any important factors I should consider here in making my design decision?
The depends upon how you plan to mount it. Look at what the antenna datasheet says about metal, if it doesn't mention anything then they are assuming none near the antenna.

Does keeping the antenna on top of RF module itself with around 0.8 mm separation lead to destructive interference? If yes, how can I tune the physical placement of the antenna for least interference?
By putting it as far away as possible.

shareimprove this answer
answered Mar 7 at 12:22

down vote
You go on about interference but that is not an issue.

To have what is called interference in the RF world, you need something else transmitting a signal, the signals then influence each other and disturb reception of these signals.

What you are doing will affect the radiation pattern and impedance of the antenna. For both non-flexible and flexible antennas the optimum radiation pattern (the one you see in the datasheet) is achieved when the antenna is used in free space. This means no conductors nearby. This "nearby" is often assumed a couple of wavelengths distance.

You do have conductors nearby, the traces on the PCB, the shielding can of the module etc. These will affect both radiation pattern and impedance. This will results in degraded sensitivity. Your module will still work but it needs to be closed to the base station.

Many mobile phones use flexible antennas near metal objects (shielding in the phone etc.) so it is common practice. But during design this influence is taken into account using EM modelling software and measurements.

Maximum typical Gain is estimated at 2dBi, we used 3D electromagnetic modeling tools to optimise the structure for minimum return loss and maximum gain.

Use of this antenna is easy, as it has integrated feed point matching, an integrated balun for feed cable isolation and solder resist defined gold plated pads for soldering.

The great thing about the antenna is its very thin profile and light weight at only 1.3 grams.

Various cable options are coming soon for the antenna to allow optimal cable lengths to be selected for each individual application.

We hope you like our new antenna !

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Product Details
Model Number: Flex PCB-WF62
Country of Origin: Taiwan
Key Specifications/Special Features:
2-layer flex PCB
1 mil PI, 1oz Cu, 1mil overlay, immersion gold, minimum hold diameter
Drilling (P.T.H.): Ø0.3mm
Punching: Ø0.50mm

Molex India Limited
Taramani, Chennai, Tamil Nadu
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WIRELESS ANTENNAS
Offering you a complete choice of products which include Custom Internal Antennas, Laser Direct Structuring Antenna, Standard Antennas, Flex PCB Antenna and Mobliqua Antenna.
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Custom Internal Antennas

Custom Internal AntennasAsk For Price
Molex is a world leader in the design, development and manufacture of custom antennas and assemblies for wireless and mobile applications; particularly for 3D antennas produced by LDS and two-shot technology, specializing in customized designs with a focus on small multiband antennas (including Pentaband and 4G LTE) and complementary (NFC, internal FM, BT/GPS, WLAN) antennas.
Molex’s Laser Direct Structuring (LDS) technology offers flexibility and geometric 3D design freedom in making antenna products beyond the previously often-used flex-antenna technologies, which only allow a maximum 2.5D design of the antenna radiator. Using a 3D laser system, LDS technology allows the transfer of the antenna design from CAD data into a molded antenna carrier or even directly onto the device structure. Cosmetic surfaces of the antenna can also be achieved by using a subsequent spray-painting process.
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Integrated Manufacturing. Molex offers a full range of integrated manufacturing services under one roof, including all antenna component sub-processes. This provides greater manufacturing efficiency and quality control. Our in-house capabilities include:
Single, two-shot and metal insert molding
LDS and two-shot plating of plastics
SMT soldering
Stamping and plating of metal antenna radiators
Flex antenna assembly
Class 2 cosmetic painting of antennas
RF and audio testing
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Laser Direct Structuring Antenna

Laser Direct Structuring AntennaAsk For Price
Molex's Laser Direct Structuring (LDS) Technology offers flexibility and geometric 3D design freedom in making antenna products beyond the previously often used flex-antenna technologies, which only allow a maximum 2.5 D design of the antenna radiator. Using a 3D laser system, LDS technology allows the transfer of the antenna design from CAD data onto a molded antenna carrier or even directly onto the device structure. Cosmetic surfaces of the antenna can also be achieved by using a subsequent spray painting process.
Surpassing the physical and economic limits of conventional antenna manufacturing technologies like flex or stamped metal, LDS technology uses a laser beam that creates the antenna pattern on the surface of complex 3D parts molded from an LDS resin. The entire production process - consisting of molding, laser structuring, and metallization - is fast and easy to set up. The key advantages of this technology include: greater flexibility for design changes and the possibility of creating antenna structures on a 3D surface. These features allow customers to achieve a higher level of product integration with fewer components and lower costs. Molex is the market leader in LDS technology with over 20 million LDS antennas produced so far.
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Standard Antennas

Standard AntennasAsk For Price
Based on diverse manufacturing and RF technologies, Molex standard antennas offer high performance and ease of integration for demanding wireless applications spanning the industrial, consumer, medical and automotive markets.
The global market is trending toward wireless applications. On the industrial side, global smart grid deployments are leading in M2M (machine-to-machine) wireless communication. In consumer markets, wireless internet television and audio dominate. Many wireless devices are better served with a standard antenna rather than a customized one. Molex standard antennas deliver superior performance for less cost and risk—and shortened lead times for bringing wireless products to market.
The current selection of Molex standard antennas are designed for M2M communication over the ISM (industrial, scientific and medical) bands and cellular bands (including GSM850, GSM900, GSM1800, GSM1900, UMTS [3G] band-1 and LTE band-7), as well as applications running Wi-Fi** and mobile TV (DVB-H and CMMB).
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Flex PCB Antenna

Flex PCB AntennaAsk For Price
Molex’s flex PCB antenna is a cost-efficient solution combined with the opportunity to integrate components such as speakers, LED’s, switches and more via reflow- and assembly processes. The flex PCB antenna manufacturing allows 2.5D design freedom, can be combined with in-molded metal pieces and cosmetic labels or coatings. Molex has extensive antenna and design experience; with more than 400 million flex PCB antenna assemblies shipped.
Molex's manufacturing capabilities span low-cost, fully-automatic R2R assembly operations for high-volume projects to semi-automatic assembly operation for smaller scale projects. Regardless of the option chosen, the final step of the manufacturing line is an in-line, 100% RF and audio (optional) pass/fail test before packaging. Based on a modular set-up, the assembly lines allow quick ramp-up and capacity increase.
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Bluetooth for hands free phone
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WLAN for mobile hot-spot

RoHS Directive-compliant
2-layer flexible PCB 1 oz immersion gold
Quick prototype and small order accept
Providing board assembly with components procurement service
Connectors mounting, LED SMT service
Main Export Markets:
Central/South AmericaEastern EuropeMid East/AfricaNorth AmericaWestern EuropeAsiaAustralasia

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Image of Taoglas' FXP831 Dual-Band Flexible AntennaTaoglas' FXP831 is a high efficiency (55-75%), small, dual-band, dipole antenna for 2.4/5.8 GHz band including Bluetooth and Wi-Fi.

This Taoglas patented antenna is unique in the market because it is made from poly-flexible material, has a tiny form factor (45 mm x 7 mm x 0.1 mm), and uses double-sided 3M tape for easy peel-and-stick mounting.

Features

Flexible ultra-low profile 45 mm x 7 mm x 0.1 mm
Adheres directly to inside of product plastic or glass housing
Form factor and cable routing convenient for integration
High efficiency
IPEX MHF connector (U.FL compatible)
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This formability makes them extremely versatile within confined enclosures.
Most antennas in electronic devices are connected to a PC board. Another advantage of a flexible circuit antenna is that the antenna and the printed circuit board can be fabricated as an integral unit, reducing assembly costs while improving reliability. This enables a low cost reliable solution that is often superior to other types of antennas.
By using printed circuit board manufacturing techniques, highly reliable and repeatable antennas can be produced in high volume. All Flex can fabricate, test and assemble antennas and accommodate quick turn production needs. Any communication/ signal receiving device needs an antenna; the list below includes few of the more common applications:

Flex PCB		Rigid FlexPCB Rapid Prototype
Flex PCB		prototype of Flex PCB
Flex Prototype		Rigid-Flex PCB Rapid Prototype China,

Turnkey Services		Turnkey Flex PCB Assembly Services,
PCB assembly		Print circuit board Manufacturing, Turnkey assembly
PCBA Assembly		SMT Assembly, EMS/OEM supplier China

Antenna Flex PCB application

Flex PCB Supplier Shenzhen, China, Flex PCB Manufacturer, Turnkey services

Flex PCB

Rigid FlexPCB Rapid Prototype

Turnkey Services

Turnkey Flex PCB Assembly Services,

Antenna Flex PCB application