<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2016-08-11</periodOfReport>

    <dateOfOriginalSubmission>2016-08-11</dateOfOriginalSubmission>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001272842</issuerCik>
        <issuerName>AIRGAIN INC</issuerName>
        <issuerTradingSymbol>AIRG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001681392</rptOwnerCik>
            <rptOwnerName>GEN3 Capital Partners, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AIRGAIN, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>3611 VALLEY CENTRE DRIVE, SUITE 150</rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92130</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001324643</rptOwnerCik>
            <rptOwnerName>GEN3 Capital I L P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AIRGAIN, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>3611 VALLEY CENTRE DRIVE, SUITE 150</rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92130</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001102545</rptOwnerCik>
            <rptOwnerName>GEN 3 PARTNERS INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AIRGAIN, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>3611 VALLEY CENTRE DRIVE, SUITE 150</rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92130</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Dividend Right</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>353811</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By GEN3 Capital I, LP</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The dividend rights are payable in cash or shares of common stock at the Issuer's election immediately upon the closing of the Issuer's initial public offering.</footnote>
        <footnote id="F2">This amendment is being filed to correct a calculation error with respect to the number of shares of common stock underlying the dividend right reported on the Reporting Persons' original Form 3.</footnote>
        <footnote id="F3">The general partner of GEN3 Capital I, LP (&quot;GEN3 Capital&quot;) is GEN3 Capital Partners, LLC (&quot;GEN3 LLC&quot;), and Jim K. Sims is the Managing Member of of GEN3 LLC. As a result, each of GEN3 LLC and Mr. Sims may be deemed to share beneficial ownership of the securities held by GEN3 Capital. Each of the individuals and entities listed herein disclaims such beneficial ownership except to the extent of his or its pecuniary interest therein.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>GEN3 Capital Partners, LLC By: /s/ Haydar Diab, Vice President</signatureName>
        <signatureDate>2016-12-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>GEN3 Capital I, LP By: GEN3 Capital Partners, LLC, its general partner By: /s/ Haydar Diab, Vice President</signatureName>
        <signatureDate>2016-12-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Gen 3 Partners, Inc. By: /s/ Haydar Diab, Vice President</signatureName>
        <signatureDate>2016-12-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
