MIMO antennas with housing and cables

Category Archives:blog

MIMO antennas with housing and cables

Soon to be introduced.

Unictron’s new high performance PILLAR chip antennas

Bluetooth chip antenna CW337

Ground clearance and PCB dimensions are no longer a concern

Unictron, the manufacturer and the designer of world-class miniature antennas, introduced a new product called pillar antenna. Pillar antennas are patented SMD type chip antennas that don’t require ground clearance area and their performance is independent of the dimensions of the ground plane of circuit board.

Unictron’s first pillar antenna bares a model name CW337. This high performance chip antenna works at 2.4GHz ISM band to support all miniature portable devices, such as: ear phone, for Bluetooth and WiFi connections.

Small wearable devices normally have challenging installation environment for the antenna designers to design a satisfactory antenna. Miniature antenna on small PCB size may often result in rather low performance, like occasional lags when listening to music, or problems in connecting to a WiFi network. Furthermore, standard antennas made from FPC, or monopole chip antennas, show large shift of frequency when the device is worn on a human body. Such shift of the frequency, caused by the change of installation environment, may make antenna lose its signal receiving capability.

In General, there are two approaches to minimize the frequency shift of antennas and make wearable devices achieve higher RF connection capability:

A) Use loop-type antennas whose near field reactance is dominated by magnetic field,
such as Unictron’s TELA antennas; or

B) Use PILLAR antennas that are vertically polarized and don’t require ground clearance.

From the viewpoint of antenna design, a ground plane on printed circuit board (PCB) not only behaves as a metal layer to reflect RF wave but also allows antenna to induce image current on the ground plane which may degenerate the performance of the antenna. That is why in designing an antenna, no metal layers are allowed above or below antenna, which is so called the ground clearance (area without metal). However, a ground plane can minimize the influence of human body on the impedance of the antenna, therefore minimize or eliminate the frequency shift which will avoid deterioration of antenna performance.

Therefore, it is always a challenge for an antenna designer of wearable devices to design an antenna with ground plane underneath the antenna to minimize the influence of human body and in the meantime also avoid the negative impact of image current which may be induced on ground plane. Unictron’s CW337 pillar chip antennas offer the best from both worlds: a miniature chip antenna on ground plane for wearable devices with little negative impact of image current and frequency shift.

The pictures below show several versions of installation locations of CW337 on a circuit board. Green color represents the metal layer while the blue color represents the area without metal layer. The yellow area is the metal pad for antenna installation. Some no metal area around installation site of antenna is needed on the top metal layer to separate the antenna from ground plane.

cw337_installation

Please note that the above pictures represent a top view of the PCB. When implementing CW337, it is always recommended to have a full metal layer on the bottom side of the PCB to reduce the influence of human body on antenna performance.

Antenna installation

Since there is no need for ground clearance, CW337 can be installed virtually anywhere on the PCB. However, as shown in placement C, when installing CW337 at the edge of circuit board, in order to achieve better performance, it is preferred to keep CW337 away from the edge with a distance of at least 10% of the width of the PCB. When placing CW337 close to the center of the PCB, vertical polarization is predominant. While moving the pillar antenna from the center to the edge of the PCB, more and more horizontal polarization will be obtained.
The pillar antennas installed at placement C from the above picture provide a mixture of horizontal and vertical polarization and enable the antenna to receive signal from all direction and various polarization. Such unique characteristics is desired for applications such as high performance true wireless ear buds*.

Typical applications

The ever popular true wireless ear buds often suffered low performance and frequency shift of antennas caused by user’s unique shape of the ear, impedance variations of the skin (e.g. dry skin versus oily skin) or indefinite direction of signal source. These difficulties are now worries of the past with the introduction of Unictron’s CW337 chip antenna!
Compared to regular monopole chip antenna, CW337 provides longer working distance as well as good quality of signal reception from all directions. User of true wireless earphones can enjoy continuous stream of music no matter which direction of the connected smartphone even during extensive exercise and jogging.
* True wireless ear buds refer to earphones that have no cable connecting left and right part. Conventional wireless earphones have a cable connecting left and right ear buds, and may have the antenna hidden inside the volume control that is part of the cable.

Services

Our well-trained and experienced engineering team will gladly help implement this chip antenna on your devices. If possible, please share with us a 3D file (in .dxf or .stp format) so that we can advise the optimal antenna installation position. In our 3D anechoic chamber, we can measure the real performance (e.g. efficiency, gain, return loss, etc.) of CW337 pillar antennas designed-in inside your devices.

Request datasheet and samples today:
www.unictron.com/contact/

 

 

Press release in pdf file:
download_pdf

Sub-giga hertz antennas for long distance communication

If you are developing some kind of tracker, or need to send some data from your device over distance of few kilometers (two way communication between devices) many times a GSM module is the solution. It is great global solution with coverage all over the world. Slight disadvantage can be that for each device there is needed to have a SIM card and a subscription from the mobile data provider.

If you are going to track things only within our country or specific area (pets in the city, bicycles, small commercial vehicles, taxi), maybe you would like to save some cost for GSM subscription and send data some other way.

LoRa, Sigfox or other technologies using sub-giga hertz frequencies can be a suitable solution. In general, lower frequency antenna can communicate to larger distance. Bluetooth and WiFi works at 2.4GHz with communication distance over few meters. With 868MHz (0.8GHz) the communication distance can easily reach over 10 km.

ISM 915_868_DECT Antennas

868MHz or 915MHz is a good compromise between communication distance and size of the antenna.

Unictron’s chip antenna for these two frequencies is only 5 x 3 x 0.5mm in size.

Lower frequencies require larger antenna and also larger PCB (to be exact, larger ground clearance area on the PCB).

Unictron’s sub-giga hertz chip antennas are available starting from 80MHz up.

Popular frequencies include 169MHz, 433MHz, 868MHz, 915MHz.

 

Shall you be interested in implementing Unictron’s chip antenna’s in to your device, feel free to ask us for a help. Our experienced antenna engineers can help you to optimize the PCB layout for better antenna performance, help with fine tuning of the antenna.

 

List of standard chip antennas is available on our website:

https://www.unictron.com/antenna/chip-antennas/

 

We can modify these standard antennas to fit whatever frequency you need in a range 80MHz to 6GHz.

 

Contact through website   Write an email

Fun Friday: LATTE Antenna

GPS LATTE chip antenna

Unictron’s loop type chip antennas are specially designed with easy usability in mind.

In “old times,” each chip antenna was manufactured for some specific central frequency.
For examples, if GPS central frequency is 1575.42MHz, the antenna manufacturer prepared chips with central frequency 1530MHz, 1550MHz, 1570MHz, 1590MHz (or something like this).
When new wireless product was being developed, engineers tested all the chips with various central frequencies, and chose the one which on their product provided final central frequency closest to 1575.42MHz.
If a company (ODM) made a new wireless product, all antenna testing had to be done again.

Unictron’s chip antennas are designed with so-called tuning element. It is usually some RLC component which helps to change the central frequency of the system. Therefore now, when you design another wireless product, you need to have only one antenna and just tune the central frequency with RLC component. Also, once you review our layout, you can use the same layout for all your devices.

This way, development time and testing time is much shorter, with better precision of controlling the antenna’s desired frequency.

As a Friday Fun activity, we came up with an abbreviation: LATTE antenna. Loop Antenna with Tweakable Tuning Element.

GPS LATTE chip antenna     WiFi LATTE chip antenna

 

Give yourself WiFi LATTE, GPS LATTE, Bluetooth LATTE, 868MHz LATTE, 915MHz LATTE.

Menu is long, just tell us your antenna coffee taste, we will make it 🙂

 

If you need a help to tune the chip antenna on your device, Unictron team can help.

Firstly by giving advice about PCB layout (please share the gerber file with us), sometimes it is better to put antenna at the corner, other times it is better to put antenna at the center of the PCB edge.

Then we can do the simulation to estimate the tuning element, or teach you directly (e.g. through video call) how to do the tuning.

And lastly, the easiest way is to send us the device, we will measure it, tune and provide optimized values of RLC tuning elements.

Although this post is written as Fun Friday, besides the LATTE coffee pictures, all information is serious.

Contact us today to learn more.

 

Contact through website   Write an email

Contest Rules

NO PURCHASE IS NECESSARY TO ENTER OR WIN. A PURCHASE DOES NOT INCREASE THE CHANCES OF WINNING.

  1. Eligibility: This Campaign is open to those who provide answers to Contest question no Unictron’s official social media sites (Twitter: https://twitter.com/unictron , Linkedin: https://www.linkedin.com/company/unictron-technologies-corp- , Google Plus: https://plus.google.com/+Unictron and Unictron’s website with particular Contest. Employees of Unictron Technologies Corp., its affiliates, subsidiaries, advertising and promotion agencies, and suppliers, (collectively the “Employees”), and immediate family members and/or those living in the same household of Employees are not eligible to participate in the Campaign. The Campaign is subject to all applicable federal, state, and local laws and regulations. Void where prohibited by law.
  2. Agreement to Rules: By participating, the Contestant (“You”) agree to be fully unconditionally bound by these Rules, and You represent and warrant that You meet the eligibility requirements. In addition, You agree to accept the decisions of Unictron Technologies Corp. as final and binding as it relates to the content of this Campaign.
  3. Campaign Period: Entries will be accepted online starting on 2016/4/27, 8:30 am Taiwan time, and ending 2016/5/30 8:30pm Taiwan time. All online entries must be received by 2016/5/30 8:30pm Taiwan time.
  4. How to Enter: The Campaign must be entered by submitting an entry using the online Contact form provided at Contest page and promoted social websites mentioned in Article 1. The entry must fulfill all Campaign requirements, as specified, to be eligible to win a prize. Entries that are incomplete or do not adhere to the rules or specifications may be disqualified at the sole discretion of Unictron Technologies Corp. You must provide the information requested. You may not enter more times than once indicated by using multiple email addresses, identities, or devices in an attempt to circumvent the rules. If You use fraudulent methods or otherwise attempt to circumvent the rules, your submission may be removed from eligibility at the sole discretion of Unictron Technologies Corp.
  5. Prizes: The Winner(s) of the Campaign (the “Winner”) will receive prizes as shown on Contest page. Actual/appraised value may differ at time of prize award. The specifics of the prize shall be solely determined by Unictron Technologies Corp. No cash or other prize substitution shall be permitted except at Unictron Technologies Corp. discretion. The prize is nontransferable. Any and all prize-related expenses, including without limitation any and all federal, state, and/or local taxes, shall be the sole responsibility of Winner. No substitution of prize or transfer/assignment of prize to others or request for the cash equivalent by Winner is permitted. Acceptance of prize constitutes permission for Unictron Technologies Corp. to use Winner’s name, likeness, and entry for purposes of advertising and trade without further compensation, unless prohibited by law.
  6. Odds: The odds of winning depend on the number of eligible entries received.
  7. Winner Selection and Notification: Winner will be selected by a random drawing under the supervision of Unictron Technologies Corp. Winner will be notified by email within five (5) working days following selection of Winner. Unictron Technologies Corp. shall have no liability for Winner’s failure to receive notices due to spam, junk e-mail or other security settings or for Winner’s provision of incorrect or otherwise non-functioning contact information. If Winner cannot be contacted, is ineligible, fails to claim the prize within 30 days from the time award notification was sent, or fails to timely return a completed and executed declaration and release as required, the prize may be forfeited and an alternate Winner selected. Receipt by Winner of the prize offered in this Campaign is conditioned upon compliance with any and all federal, state, and local laws and regulations. ANY VIOLATION OF THESE OFFICIAL RULES BY WINNER (AT Unictron Technologies Corp.’S SOLE DISCRETION) WILL RESULT IN WINNER’S DISQUALIFICATION AS WINNER OF THE CAMPAIGN, AND ALL PRIVILEGES AS WINNER WILL BE IMMEDIATELY TERMINATED.
  8. Rights Granted by You: By entering this content (e.g., photo, video, text, etc.), You understand and agree that Unictron Technologies Corp., anyone acting on behalf of Unictron Technologies Corp., and Unictron Technologies Corp.’s licensees, successors, and assigns, shall have the right, where permitted by law, to print, publish, broadcast, distribute, and use in any media now known or hereafter developed, in perpetuity and throughout the World, without limitation, your entry, name, portrait, picture, voice, likeness, image, statements about the Campaign, and biographical information for news, publicity, information, trade, advertising, public relations, and promotional purposes. without any further compensation, notice, review, or consent. Optional verbiage for Contests: By entering this content, You represent and warrant that your entry is an original work of authorship, and does not violate any third party’s proprietary or intellectual property rights. If your entry infringes upon the intellectual property right of another, You will be disqualified at the sole discretion of Unictron Technologies Corp. If the content of your entry is claimed to constitute infringement of any proprietary or intellectual proprietary rights of any third party, You shall, at your sole expense, defend or settle against such claims. You shall indemnify, defend, and hold harmless Unictron Technologies Corp. from and against any suit, proceeding, claims, liability, loss, damage, costs or expense, which Unictron Technologies Corp. may incur, suffer, or be required to pay arising out of such infringement or suspected infringement of any third party’s right.
  9. Terms & Conditions: Unictron Technologies Corp. reserves the right, in its sole discretion, to cancel, terminate, modify or suspend the Campaign should virus, bug, non-authorized human intervention, fraud, or other cause beyond Unictron Technologies Corp.’s control corrupt or affect the administration, security, fairness, or proper conduct of the Campaign. In such case, Unictron Technologies Corp. may select the Winner from all eligible entries received prior to and/or after (if appropriate) the action taken by Unictron Technologies Corp. Unictron Technologies Corp. reserves the right, in its sole discretion, to disqualify any individual who tampers or attempts to tamper with the entry process or the operation of the Campaign or website or violates these Terms & Conditions. Unictron Technologies Corp.has the right, in its sole discretion, to maintain the integrity of the Campaign, to void votes for any reason, including, but not limited to: multiple entries from the same user from different IP addresses; multiple entries from the same computer in excess of that allowed by Campaign rules; or the use of bots, macros, scripts, or other technical means for entering. Any attempt by an entrant to deliberately damage any website or undermine the legitimate operation of the Campaign may be a violation of criminal and civil laws. Should such attempt be made, Unictron Technologies Corp.reserves the right to seek damages to the fullest extent permitted by law.
  10. Limitation of Liability: By entering, You agree to release and hold harmless Unictron Technologies Corp. and its subsidiaries, affiliates, advertising and promotion agencies, partners, representatives, agents, successors, assigns, employees, officers, and directors from any liability, illness, injury, death, loss, litigation, claim, or damage that may occur, directly or indirectly, whether caused by negligence or not, from: (i) such entrant’s participation in the Campaign and/or his/her acceptance, possession, use, or misuse of any prize or any portion thereof; (ii) technical failures of any kind, including but not limited to the malfunction of any computer, cable, network, hardware, or software, or other mechanical equipment; (iii) the unavailability or inaccessibility of any transmissions, telephone, or Internet service; (iv) unauthorized human intervention in any part of the entry process or the Promotion; (v) electronic or human error in the administration of the Promotion or the processing of entries.
  11. Disputes: THIS Campaign IS GOVERNED BY THE LAWS OF TAIWAN WITHOUT RESPECT TO CONFLICT OF LAW DOCTRINES. As a condition of participating in this Campaign, participant agrees that any and all disputes that cannot be resolved between the parties, and causes of action arising out of or connected with this Campaign, shall be resolved individually, without resort to any form of class action, exclusively before a court located in Taipei having jurisdiction. Further, in any such dispute, under no circumstances shall participant be permitted to obtain awards for, and hereby waives all rights to, punitive, incidental, or consequential damages, including reasonable attorney’s fees, other than participant’s actual out-of-pocket expenses (i.e. costs associated with entering this Campaign). Participant further waives all rights to have damages multiplied or increased.
  12. Privacy Policy: Information submitted with an entry is subject to the Privacy Policy stated on the Unictron Technologies Corp. website. To read the Privacy Policy, [privacy policy URL] click here. Note: a privacy policy is optional, but may be required when running a promotion on the web when using third party platforms or when using features from social channels. Including this information makes it clear to your users how you are going to use their information.

Win Free Chip antenna sample WiFi Bluetooth

Contest is Closed.
Thanks to everyone who participated.

contest-banner

Our first Prize Contest is here.

Tell us what is shown in the picture below:

guess what is in the picture

Guess what is in the picture


Your answer *
Email address *

* Required field

 

  • Unictron’s employees are excluded from the contest.
  • End of Contest: 2016/5/30 (Monday)
  • Datasheet and technical help how to accommodate the chip antenna will be provided to the winner.
  • Number of chip antennas for winner: 3 pcs
  • Winner will be selected by computer on 2016/5/31
  • Winner needs to provide full shipping address, with full name and phone, so that Unictron can arrange the delivery.
  • Collected Collected data are to determine Winner only. Data will not be used for marketing purposes and will not be shared with third Parties.
  • By providing your contest answer, You, the Contestant, have affirmatively reviewed, accepted, and agreed to all of the Official Rules.
  • Full list or contest rules.

chip-antenna-contest

  • Chip antenna dimensions: 3.2 x 1.6 x 0.5 mm
  • Usage: WiFi and Bluetooth
  • Center frequency: 2450MHz
  • Bandwidth: depends on PCB design
  • Efficiency: depends on PCB design
  • Mount: SMT (or solder by hand)
  • Technical help and datasheet will be provided to the winner.
If you are not a winner and still interesting in reviewing datasheet, please mention this in the “Your answer” area. Also, if you are not a winner and would like to purchase samples, you can let us know. Contact details: http://www.unictron.com/contact/

Do you struggle with performance of PCB antenna in your device?

It is often overlooked that cable connected on PCB antenna is part of the antenna. Cable can influence antenna performance not only because of various length (longer cable, bigger loss of energy), but also when cable is bent in such way that antenna was not designed with such bending in mind.

When bending cable too much, capacitance of the system will change resulting in shift of the central frequency. This may lead to antenna that does not work at all, or antenna that will require more power to get satisfactory signal. In case of portable devices, taking more power because of the antenna obviously shortens working time on battery.

Therefore, it is important to consult the placement of PCB antenna with your antenna supplier.

One way how to avoid troubles with cables is to use chip antennas that are soldered directly on your mother board. Chip antennas often require only small space on the motherboard and are available for basically all frequencies as PCB antennas.

For more info feel free to discuss with us in real time on Skype.
Contacts for our team members are available on http://www.unictron.com/contact/

Antenna products inside a car

 

antennas_in_car_picture

 

Picture above shows a brief overview of antennas used in an automobile.

Displayed antenna pictures are Unictron’s standard products.

Unictron has own antenna lab and few anechoic chambers where our antenna engineers can help to measure and tune antennas directly inside your device to reach optimal performance.

Download presentation: antennas in a car.

 

Image credit:

Image credit for Piezo in a car

 

Contact us

Piezo products inside a car

 

Piezo products in a car

(click on image to enlarge)

 

Piezo products are tailor-made according to customer’s specification.

For sample request, product development, feel free to contact us.

 

Download presentation: piezo in a car.

 

Image credit:

Image credit for Piezo in a car

 
Contact us